protected bool AddDataSortInformation(ISortInformation sortInformation, RequestedAttribute miaIdAttribute, IList <TableJoin> tableJoins, IList <CompiledSortInformation> compiledSortInformation,
IList <BindVar> bindVars, ref BindVar userVar)
{
DataSortInformation dataSort = sortInformation as DataSortInformation;
if (dataSort != null && _userProfileId.HasValue)
{
TableQueryData tqd = new TableQueryData(UserProfileDataManagement.UserProfileDataManagement_SubSchema.USER_MEDIA_ITEM_DATA_TABLE_NAME);
RequestedAttribute ra = new RequestedAttribute(tqd, UserProfileDataManagement.UserProfileDataManagement_SubSchema.USER_DATA_VALUE_COL_NAME);
compiledSortInformation.Add(new CompiledSortInformation(ra, dataSort.Direction));
if (userVar == null)
{
userVar = new BindVar("UID", _userProfileId.Value, typeof(Guid));
bindVars.Add(userVar);
}
TableJoin join = new TableJoin("LEFT OUTER JOIN", tqd, new RequestedAttribute(tqd, UserProfileDataManagement.UserProfileDataManagement_SubSchema.USER_PROFILE_ID_COL_NAME), "@" + userVar.Name);
join.AddCondition(new RequestedAttribute(tqd, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME), miaIdAttribute);
join.AddCondition(new RequestedAttribute(tqd, UserProfileDataManagement.UserProfileDataManagement_SubSchema.USER_DATA_KEY_COL_NAME), $"'{dataSort.UserDataKey}'");
tableJoins.Add(join);
return(true);
}
return(false);
}
public TableJoin(string joinType, TableQueryData table, object joinAttr1, object joinAttr2)
{
_joinType = joinType;
_table = table;
_joinAttr1 = joinAttr1;
_joinAttr2 = joinAttr2;
}
public TableJoin(string joinType, TableQueryData table, object joinAttr1, object joinAttr2)
{
_joinType = joinType;
_table = table;
_joinAttr1 = joinAttr1;
_joinAttr2 = joinAttr2;
}
public TableJoin(string joinType, TableQueryData table, object joinAttr1, object joinAttr2)
{
_joinType = joinType;
_table = table;
if (joinAttr1 != null && joinAttr2 != null)
{
_conditionPairs.Add(joinAttr1, joinAttr2);
}
}
protected bool AddChildAggregateAttributeSortInformation(ISortInformation sortInformation, Namespace ns, BindVarNamespace bvNamespace, RequestedAttribute miaIdAttribute, IList <TableJoin> tableJoins,
IList <CompiledSortInformation> compiledSortInformation, IList <BindVar> bindVars)
{
ChildAggregateAttributeSortInformation childAttributeSort = sortInformation as ChildAggregateAttributeSortInformation;
if (childAttributeSort != null)
{
if (childAttributeSort.ChildAttributeType.ParentMIAM.IsTransientAspect)
{
return(false);
}
var relation = _miaManagement.LocallyKnownRelationshipTypes.FirstOrDefault(r => (r.ChildRole == childAttributeSort.ChildRole && r.ParentRole == childAttributeSort.ParentRole));
if (relation == null)
{
return(false);
}
if (!_miaManagement.ManagedMediaItemAspectTypes.TryGetValue(relation.ChildAspectId, out var childMetadata))
{
return(false);
}
BindVar roleVar = new BindVar(bvNamespace.CreateNewBindVarName("V"), childAttributeSort.ParentRole, typeof(Guid));
bindVars.Add(roleVar);
BindVar linkedRoleVar = new BindVar(bvNamespace.CreateNewBindVarName("V"), childAttributeSort.ChildRole, typeof(Guid));
bindVars.Add(linkedRoleVar);
var table = new TableQueryData($"({BuildRelationshipPart(childAttributeSort, childMetadata, false, roleVar, linkedRoleVar)} UNION {BuildRelationshipPart(childAttributeSort, childMetadata, true, roleVar, linkedRoleVar)})");
var tableName = table.GetAlias(ns);
tableJoins.Add(new TableJoin("INNER JOIN", table, $"{tableName}.ID", miaIdAttribute.GetQualifiedName(ns)));
RequestedAttribute ra = new RequestedAttribute(table, "SORT");
compiledSortInformation.Add(new CompiledSortInformation(ra, childAttributeSort.Direction));
return(true);
}
return(false);
}
public TableJoin(string joinType, TableQueryData table, RequestedAttribute joinAttr1, RequestedAttribute joinAttr2) :
this(joinType, table, (object) joinAttr1, (object) joinAttr2) { }
protected void GenerateSqlStatement(bool groupByValues,
IDictionary <MediaItemAspectMetadata, string> miamAliases,
out string mediaItemIdOrGroupSizeAlias,
out IDictionary <QueryAttribute, string> attributeAliases,
out string statementStr, out IList <BindVar> bindVars)
{
Namespace ns = new Namespace();
BindVarNamespace bvNamespace = new BindVarNamespace();
// Contains a mapping of each queried (=selected or filtered) attribute to its request attribute instance
// data (which holds its requested query table instance)
IDictionary <QueryAttribute, RequestedAttribute> requestedAttributes = new Dictionary <QueryAttribute, RequestedAttribute>();
attributeAliases = new Dictionary <QueryAttribute, string>();
// Contains a list of qualified attribute names for all select attributes - needed for GROUP BY-expressions
ICollection <string> qualifiedGroupByAliases = new List <string>();
// Contains a list of compiled select attribute declarations. We need this in a separate list (in contrast to using
// the selectAttributes list together with the compiledAttributes map) because it might be the case that
// an attribute is requested twice. In that rare case, we need a new alias name for it.
IList <string> selectAttributeDeclarations = new List <string>();
// Dictionary containing as key the requested MIAM instance OR attribute specification of cardinality MTO,
// mapped to the table query data to request its contents.
IDictionary <object, TableQueryData> tableQueries = new Dictionary <object, TableQueryData>();
// Contains the same tables as the tableQueries variable, but in order and enriched with table join data
IList <TableJoin> tableJoins = new List <TableJoin>();
// Contains all table query data for MIA type tables
IDictionary <MediaItemAspectMetadata, TableQueryData> miaTypeTableQueries = new Dictionary <MediaItemAspectMetadata, TableQueryData>();
// Albert, 2012-01-29: Optimized query, don't join with media items table, if we have necessary requested MIAs. In that case,
// we can use one of their media item ids.
//// First create the request table query data for the MIA main table and the request attribute for the MIA ID.
//// We'll need the requested attribute as join attribute soon.
//TableQueryData miaTableQuery = new TableQueryData(MediaLibrary_SubSchema.MEDIA_ITEMS_TABLE_NAME);
//RequestedAttribute miaIdAttribute = new RequestedAttribute(miaTableQuery, MediaLibrary_SubSchema.MEDIA_ITEMS_ITEM_ID_COL_NAME);
RequestedAttribute miaIdAttribute = null; // Lazy initialized below
// Contains CompiledSortInformation instances for each sort information instance
IList <CompiledSortInformation> compiledSortInformation = null;
List <BindVar> sqlVars = new List <BindVar>();
// Ensure that the tables for all necessary MIAs are requested first (INNER JOIN)
foreach (MediaItemAspectMetadata miaType in _necessaryRequestedMIAs)
{
if (miaType.IsTransientAspect)
{
continue;
}
if (tableQueries.ContainsKey(miaType))
{
// We only come here if miaType was already queried as necessary MIA, so optimize redundant entry
continue;
}
TableQueryData tqd = tableQueries[miaType] = TableQueryData.CreateTableQueryOfMIATable(_miaManagement, miaType);
miaTypeTableQueries.Add(miaType, tqd);
RequestedAttribute ra;
// The first table join has invalid join attributes because miaIdAttribute is still null - but only the join table attribute is necessary
// for the the first table - see below
tableJoins.Add(new TableJoin("INNER JOIN", tqd,
ra = new RequestedAttribute(tqd, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME), miaIdAttribute));
if (miaIdAttribute == null)
{
miaIdAttribute = ra;
}
}
if (miaIdAttribute == null)
{ // If we didn't request any necessary MIA types, we have to add an artificial table for the miaIdAttribute
TableQueryData miaTableQuery = new TableQueryData(MediaLibrary_SubSchema.MEDIA_ITEMS_TABLE_NAME);
tableJoins.Add(new TableJoin("INNER JOIN", miaTableQuery, null, null)); // First table join has invalid join attributes - not needed for first table
miaIdAttribute = new RequestedAttribute(miaTableQuery, MediaLibrary_SubSchema.MEDIA_ITEMS_ITEM_ID_COL_NAME);
}
// Ensure that the tables for all optional MIAs are requested first (LEFT OUTER JOIN)
// That is necessary to make empty optional MIA types available in the result
foreach (MediaItemAspectMetadata miaType in _optionalRequestedMIAs)
{
if (miaType.IsTransientAspect)
{
continue;
}
if (tableQueries.ContainsKey(miaType))
{
// We only come here if miaType was already queried as necessary or optional MIA, so optimize redundant entry
continue;
}
TableQueryData tqd = tableQueries[miaType] = TableQueryData.CreateTableQueryOfMIATable(_miaManagement, miaType);
miaTypeTableQueries.Add(miaType, tqd);
tableJoins.Add(new TableJoin("LEFT OUTER JOIN", tqd,
new RequestedAttribute(tqd, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME), miaIdAttribute));
}
// Build table query data for each selected Inline and MTO attribute
// + select query attribute
// + add alias to selectAttributeDeclarations
foreach (QueryAttribute attr in _selectAttributes)
{
if (attr.Attr.ParentMIAM.IsTransientAspect)
{
continue;
}
RequestedAttribute ra;
RequestSimpleAttribute(attr, tableQueries, tableJoins, "LEFT OUTER JOIN", requestedAttributes, miaTypeTableQueries,
miaIdAttribute, out ra);
string alias;
selectAttributeDeclarations.Add(_selectProjectionFunction == null ?
ra.GetDeclarationWithAlias(ns, out alias) :
ra.GetDeclarationWithAlias(ns, _selectProjectionFunction, out alias));
attributeAliases.Add(attr, alias);
qualifiedGroupByAliases.Add(ra.GetAlias(ns));
}
CompiledFilter compiledFilter = CreateCompiledFilter(ns, bvNamespace, miaIdAttribute.GetQualifiedName(ns), tableJoins);
// Build table query data for each Inline attribute which is part of a filter
// + compile query attribute
foreach (QueryAttribute attr in compiledFilter.RequiredAttributes)
{
if (attr.Attr.ParentMIAM.IsTransientAspect)
{
continue;
}
if (attr.Attr.Cardinality != Cardinality.Inline && attr.Attr.Cardinality != Cardinality.ManyToOne)
{
continue;
}
// Tables of Inline and MTO attributes, which are part of a filter, are joined with main table
RequestedAttribute ra;
RequestSimpleAttribute(attr, tableQueries, tableJoins, "LEFT OUTER JOIN", requestedAttributes,
miaTypeTableQueries, miaIdAttribute, out ra);
}
// Build table query data for each sort attribute
if (_sortInformation != null)
{
compiledSortInformation = new List <CompiledSortInformation>();
BindVar userVar = null;
foreach (ISortInformation sortInformation in _sortInformation)
{
AttributeSortInformation attributeSort = sortInformation as AttributeSortInformation;
if (attributeSort != null)
{
if (attributeSort.AttributeType.ParentMIAM.IsTransientAspect)
{
continue;
}
MediaItemAspectMetadata.AttributeSpecification attr = attributeSort.AttributeType;
if (attr.Cardinality != Cardinality.Inline && attr.Cardinality != Cardinality.ManyToOne)
{
// Sorting can only be done for Inline and MTO attributes
continue;
}
RequestedAttribute ra;
RequestSimpleAttribute(new QueryAttribute(attr), tableQueries, tableJoins, "LEFT OUTER JOIN", requestedAttributes,
miaTypeTableQueries, miaIdAttribute, out ra);
compiledSortInformation.Add(new CompiledSortInformation(ra, attributeSort.Direction));
continue;
}
DataSortInformation dataSort = sortInformation as DataSortInformation;
if (dataSort != null && _userProfileId.HasValue)
{
TableQueryData tqd = new TableQueryData(UserProfileDataManagement.UserProfileDataManagement_SubSchema.USER_MEDIA_ITEM_DATA_TABLE_NAME);
RequestedAttribute ra = new RequestedAttribute(tqd, UserProfileDataManagement.UserProfileDataManagement_SubSchema.USER_DATA_VALUE_COL_NAME);
compiledSortInformation.Add(new CompiledSortInformation(ra, dataSort.Direction));
if (userVar == null)
{
userVar = new BindVar("UID", _userProfileId.Value, typeof(Guid));
sqlVars.Add(userVar);
}
TableJoin join = new TableJoin("LEFT OUTER JOIN", tqd, new RequestedAttribute(tqd, UserProfileDataManagement.UserProfileDataManagement_SubSchema.USER_PROFILE_ID_COL_NAME), "@" + userVar.Name);
join.AddCondition(new RequestedAttribute(tqd, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME), miaIdAttribute);
join.AddCondition(new RequestedAttribute(tqd, UserProfileDataManagement.UserProfileDataManagement_SubSchema.USER_DATA_KEY_COL_NAME), $"'{dataSort.UserDataKey}'");
tableJoins.Add(join);
}
}
}
StringBuilder result = new StringBuilder("SELECT ");
string groupClause = StringUtils.Join(", ", qualifiedGroupByAliases.Select(alias => "V." + alias));
if (groupByValues)
{
mediaItemIdOrGroupSizeAlias = "C";
// Create an additional COUNT expression for the MEDIA_ITEMS.MEDIA_ITEM_ID in the GROUP BY-statement
result.Append("COUNT(V.C) ");
result.Append(mediaItemIdOrGroupSizeAlias);
if (!string.IsNullOrWhiteSpace(groupClause))
{
result.Append(", ");
result.Append(groupClause);
}
result.Append(" FROM (");
result.Append("SELECT DISTINCT ");
result.Append(miaIdAttribute.GetQualifiedName(ns));
result.Append(" C");
}
else
{
// Append plain attribute MEDIA_ITEMS.MEDIA_ITEM_ID if no GROUP BY-statement is requested
result.Append(miaIdAttribute.GetDeclarationWithAlias(ns, out mediaItemIdOrGroupSizeAlias));
// System attributes: Necessary to evaluate if a requested MIA is present for the media item
foreach (KeyValuePair <MediaItemAspectMetadata, TableQueryData> kvp in miaTypeTableQueries)
{
result.Append(", ");
string miamColumn = kvp.Value.GetAlias(ns) + "." + MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME;
result.Append(miamColumn);
string miamAlias = ns.GetOrCreate(miamColumn, "A");
result.Append(" ");
result.Append(miamAlias);
if (miamAlias != null)
{
miamAliases.Add(kvp.Key, miamAlias);
}
}
}
// Selected attributes
foreach (string selectAttr in selectAttributeDeclarations)
{
result.Append(", ");
result.Append(selectAttr);
}
string whereStr = compiledFilter.CreateSqlFilterCondition(ns, requestedAttributes, out bindVars);
foreach (BindVar bv in sqlVars)
{
bindVars.Add(bv);
}
result.Append(" FROM ");
bool firstJoinTable = true;
// Other joined tables
foreach (TableJoin tableJoin in tableJoins)
{
if (firstJoinTable)
{
result.Append(tableJoin.JoinedTable.GetDeclarationWithAlias(ns));
firstJoinTable = false;
}
else
{
result.Append(tableJoin.GetJoinDeclaration(ns));
}
result.Append(' ');
}
if (!string.IsNullOrEmpty(whereStr))
{
result.Append(" WHERE ");
result.Append(whereStr);
}
if (groupByValues)
{
result.Append(") V");
if (qualifiedGroupByAliases.Count > 0)
{
result.Append(" GROUP BY ");
result.Append(groupClause);
}
}
else
{
if (compiledSortInformation != null && compiledSortInformation.Count > 0)
{
IEnumerable <string> sortCriteria = compiledSortInformation.Select(csi => csi.GetSortDeclaration(ns));
result.Append(" ORDER BY ");
result.Append(StringUtils.Join(", ", sortCriteria));
}
}
statementStr = result.ToString();
}
protected void RequestSimpleAttribute(QueryAttribute queryAttribute,
IDictionary <object, TableQueryData> tableQueries, IList <TableJoin> tableJoins, string miaJoinType,
IDictionary <QueryAttribute, RequestedAttribute> requestedAttributes,
IDictionary <MediaItemAspectMetadata, TableQueryData> miaTypeTableQueries,
RequestedAttribute miaIdAttribute, out RequestedAttribute requestedAttribute)
{
if (requestedAttributes.TryGetValue(queryAttribute, out requestedAttribute))
{
// Already requested
return;
}
MediaItemAspectMetadata.AttributeSpecification spec = queryAttribute.Attr;
MediaItemAspectMetadata miaType = spec.ParentMIAM;
TableQueryData tqd;
switch (spec.Cardinality)
{
case Cardinality.Inline:
// For Inline queries, we request the Inline attribute's column name at the MIA main table, which gets joined
// with the MIA ID
if (!tableQueries.TryGetValue(miaType, out tqd))
{
tqd = tableQueries[miaType] = TableQueryData.CreateTableQueryOfMIATable(_miaManagement, miaType);
if (miaTypeTableQueries != null)
{
miaTypeTableQueries.Add(miaType, tqd);
}
tableJoins.Add(new TableJoin(miaJoinType, tqd, miaIdAttribute,
new RequestedAttribute(tqd, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME)));
}
requestedAttribute = new RequestedAttribute(tqd, _miaManagement.GetMIAAttributeColumnName(queryAttribute.Attr));
break;
case Cardinality.ManyToOne:
// For MTO queries, we request both the MIA main table and the MTO table
TableQueryData miaTqd;
if (!tableQueries.TryGetValue(miaType, out miaTqd))
{
miaTqd = tableQueries[miaType] = TableQueryData.CreateTableQueryOfMIATable(_miaManagement, miaType);
if (miaTypeTableQueries != null)
{
miaTypeTableQueries.Add(miaType, miaTqd);
}
// Add MIA main table to list of table joins
tableJoins.Add(new TableJoin(miaJoinType, miaTqd, miaIdAttribute,
new RequestedAttribute(miaTqd, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME)));
}
if (!tableQueries.TryGetValue(spec, out tqd))
{
tqd = tableQueries[spec] = TableQueryData.CreateTableQueryOfMTOTable(_miaManagement, spec);
// We must use left outer joins for MTO value tables, because if the value is null, the association FK is null
tableJoins.Add(new TableJoin("LEFT OUTER JOIN", tqd,
new RequestedAttribute(miaTqd, _miaManagement.GetMIAAttributeColumnName(queryAttribute.Attr)),
new RequestedAttribute(tqd, MIA_Management.FOREIGN_COLL_ATTR_ID_COL_NAME)));
}
requestedAttribute = new RequestedAttribute(tqd, MIA_Management.COLL_ATTR_VALUE_COL_NAME);
break;
default:
throw new IllegalCallException("Attributes of cardinality '{0}' cannot be queried via the {1}", spec.Cardinality, GetType().Name);
}
requestedAttributes.Add(queryAttribute, requestedAttribute);
}
protected void CompileStatementParts(MIA_Management miaManagement, IFilter filter, Namespace ns, BindVarNamespace bvNamespace,
ICollection<MediaItemAspectMetadata> requiredMIATypes, string outerMIIDJoinVariable, ICollection<TableJoin> tableJoins,
IList<object> resultParts, IList<BindVar> resultBindVars)
{
if (filter == null)
return;
MediaItemIdFilter mediaItemIdFilter = filter as MediaItemIdFilter;
if (mediaItemIdFilter != null)
{
ICollection<Guid> mediaItemIds = mediaItemIdFilter.MediaItemIds;
if (mediaItemIds.Count == 0)
resultParts.Add("1 = 2");
else
{
if (mediaItemIds.Count == 1)
{
resultParts.Add(outerMIIDJoinVariable);
BindVar bindVar = new BindVar(bvNamespace.CreateNewBindVarName("V"), mediaItemIds.First(), typeof(Guid));
resultParts.Add(" = @" + bindVar.Name);
resultBindVars.Add(bindVar);
}
else
{
bool first = true;
ICollection<string> clusterExpressions = new List<string>();
foreach (IList<Guid> mediaItemIdsCluster in CollectionUtils.Cluster(mediaItemIds, MAX_IN_VALUES_SIZE))
{
IList<string> bindVarRefs = new List<string>(MAX_IN_VALUES_SIZE);
foreach (Guid mediaItemId in mediaItemIdsCluster)
{
BindVar bindVar = new BindVar(bvNamespace.CreateNewBindVarName("V"), mediaItemId, typeof(Guid));
bindVarRefs.Add("@" + bindVar.Name);
resultBindVars.Add(bindVar);
}
if (!first)
resultParts.Add(" OR ");
first = false;
resultParts.Add(outerMIIDJoinVariable);
resultParts.Add(" IN (" + StringUtils.Join(", ", bindVarRefs) + ")");
}
resultParts.Add(StringUtils.Join(" OR ", clusterExpressions));
}
}
return;
}
BooleanCombinationFilter boolFilter = filter as BooleanCombinationFilter;
if (boolFilter != null)
{
int numOperands = boolFilter.Operands.Count;
IEnumerator enumOperands = boolFilter.Operands.GetEnumerator();
if (!enumOperands.MoveNext())
return;
if (numOperands > 1)
resultParts.Add("(");
CompileStatementParts(miaManagement, (IFilter) enumOperands.Current, ns, bvNamespace,
requiredMIATypes, outerMIIDJoinVariable, tableJoins, resultParts, resultBindVars);
while (enumOperands.MoveNext())
{
switch (boolFilter.Operator)
{
case BooleanOperator.And:
resultParts.Add(" AND ");
break;
case BooleanOperator.Or:
resultParts.Add(" OR ");
break;
default:
throw new NotImplementedException(string.Format(
"Boolean filter operator '{0}' isn't supported by the media library", boolFilter.Operator));
}
CompileStatementParts(miaManagement, (IFilter) enumOperands.Current, ns, bvNamespace,
requiredMIATypes, outerMIIDJoinVariable, tableJoins, resultParts, resultBindVars);
}
if (numOperands > 1)
resultParts.Add(")");
return;
}
NotFilter notFilter = filter as NotFilter;
if (notFilter != null)
{
resultParts.Add("NOT (");
CompileStatementParts(miaManagement, notFilter.InnerFilter, ns, bvNamespace,
requiredMIATypes, outerMIIDJoinVariable, tableJoins, resultParts, resultBindVars);
resultParts.Add(")");
return;
}
FalseFilter falseFilter = filter as FalseFilter;
if (falseFilter != null)
{
resultParts.Add("1 = 2");
return;
}
// Must be done before checking IAttributeFilter - EmptyFilter is also an IAttributeFilter but must be
// compiled in a different way
EmptyFilter emptyFilter = filter as EmptyFilter;
if (emptyFilter != null)
{
MediaItemAspectMetadata.AttributeSpecification attributeType = emptyFilter.AttributeType;
requiredMIATypes.Add(attributeType.ParentMIAM);
Cardinality cardinality = attributeType.Cardinality;
if (cardinality == Cardinality.Inline || cardinality == Cardinality.ManyToOne)
{
resultParts.Add(new QueryAttribute(attributeType));
resultParts.Add(" IS NULL"); // MTO attributes are joined with left outer joins and thus can also be checked for NULL
}
else if (cardinality == Cardinality.OneToMany)
{
resultParts.Add("NOT EXISTS(");
resultParts.Add("SELECT V.");
resultParts.Add(MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME);
resultParts.Add(" FROM ");
resultParts.Add(miaManagement.GetMIACollectionAttributeTableName(attributeType));
resultParts.Add(" V WHERE V.");
resultParts.Add(MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME);
resultParts.Add("=");
resultParts.Add(outerMIIDJoinVariable);
resultParts.Add(")");
}
else if (cardinality == Cardinality.ManyToMany)
{
resultParts.Add("NOT EXISTS(");
resultParts.Add("SELECT NM.");
resultParts.Add(MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME);
resultParts.Add(" FROM ");
resultParts.Add(miaManagement.GetMIACollectionAttributeNMTableName(attributeType));
resultParts.Add(" NM INNER JOIN ");
resultParts.Add(miaManagement.GetMIACollectionAttributeTableName(attributeType));
resultParts.Add(" V ON NM.");
resultParts.Add(MIA_Management.FOREIGN_COLL_ATTR_ID_COL_NAME);
resultParts.Add(" = V.");
resultParts.Add(MIA_Management.FOREIGN_COLL_ATTR_ID_COL_NAME);
resultParts.Add(" WHERE NM.");
resultParts.Add(MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME);
resultParts.Add("=");
resultParts.Add(outerMIIDJoinVariable);
resultParts.Add(")");
}
return;
}
IAttributeFilter attributeFilter = filter as IAttributeFilter;
if (attributeFilter != null)
{
// For attribute filters, we have to create different kinds of expressions, depending on the
// cardinality of the attribute to be filtered.
// For Inline and MTO attributes, we simply create
//
// QA [Operator] [Comparison-Value]
//
// for OTM attributes, we create
//
// INNER JOIN [OTM-Value-Table] V ON V.MEDIA_ITEM_ID=[Outer-Join-Variable-Placeholder]
// WHERE [...] and V.VALUE [Operator] [Comparison-Value])
//
// for MTM attributes, we create
//
// INNER JOIN [MTM-NM-Table] NM ON NM.MEDIA_ITEM_ID=[Outer-Join-Variable-Placeholder]
// INNER JOIN [MTM-Value-Table] V ON NM.ID = V.ID
// WHERE [...] AND V.VALUE [Operator] [Comparison-Value])
MediaItemAspectMetadata.AttributeSpecification attributeType = attributeFilter.AttributeType;
requiredMIATypes.Add(attributeType.ParentMIAM);
Cardinality cardinality = attributeType.Cardinality;
if (cardinality == Cardinality.Inline || cardinality == Cardinality.ManyToOne)
BuildAttributeFilterExpression(attributeFilter, new QueryAttribute(attributeType), bvNamespace,
resultParts, resultBindVars);
else if (cardinality == Cardinality.OneToMany)
{
string joinTable = miaManagement.GetMIACollectionAttributeTableName(attributeType);
string attrName;
if (!_innerJoinedTables.TryGetValue(joinTable, out attrName))
{
TableQueryData tqd = new TableQueryData(joinTable);
tableJoins.Add(new TableJoin("LEFT OUTER JOIN", tqd,
new RequestedAttribute(tqd, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME), outerMIIDJoinVariable));
attrName = new RequestedAttribute(tqd, MIA_Management.COLL_ATTR_VALUE_COL_NAME).GetQualifiedName(ns);
_innerJoinedTables.Add(joinTable, attrName);
}
BuildAttributeFilterExpression(attributeFilter, attrName, bvNamespace, resultParts, resultBindVars);
}
else if (cardinality == Cardinality.ManyToMany)
{
string miaCollectionAttributeNMTableName = miaManagement.GetMIACollectionAttributeNMTableName(attributeType);
string attrName;
if (!_innerJoinedTables.TryGetValue(miaCollectionAttributeNMTableName, out attrName))
{
TableQueryData tqdMiaCollectionAttributeNMTable = new TableQueryData(miaCollectionAttributeNMTableName);
tableJoins.Add(new TableJoin("LEFT OUTER JOIN", tqdMiaCollectionAttributeNMTable,
new RequestedAttribute(tqdMiaCollectionAttributeNMTable, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME), outerMIIDJoinVariable));
TableQueryData tqdMiaCollectionAttributeTable = new TableQueryData(miaManagement.GetMIACollectionAttributeTableName(attributeType));
tableJoins.Add(new TableJoin("LEFT OUTER JOIN", tqdMiaCollectionAttributeTable,
new RequestedAttribute(tqdMiaCollectionAttributeNMTable, MIA_Management.FOREIGN_COLL_ATTR_ID_COL_NAME),
new RequestedAttribute(tqdMiaCollectionAttributeTable, MIA_Management.FOREIGN_COLL_ATTR_ID_COL_NAME)));
attrName = tqdMiaCollectionAttributeTable.GetAlias(ns) + "." + MIA_Management.COLL_ATTR_VALUE_COL_NAME;
_innerJoinedTables.Add(miaCollectionAttributeNMTableName, attrName);
}
BuildAttributeFilterExpression(attributeFilter, attrName, bvNamespace, resultParts, resultBindVars);
}
return;
}
throw new InvalidDataException("Filter type '{0}' isn't supported by the media library", filter.GetType().Name);
}
protected void CompileStatementParts(MIA_Management miaManagement, IFilter filter, Namespace ns, BindVarNamespace bvNamespace,
ICollection <MediaItemAspectMetadata> requiredMIATypes, string outerMIIDJoinVariable, ICollection <TableJoin> tableJoins,
IList <object> resultParts, IList <BindVar> resultBindVars)
{
if (filter == null)
{
return;
}
MediaItemIdFilter mediaItemIdFilter = filter as MediaItemIdFilter;
if (mediaItemIdFilter != null)
{
ICollection <Guid> mediaItemIds = mediaItemIdFilter.MediaItemIds;
if (mediaItemIds.Count == 0)
{
resultParts.Add("1 = 2");
}
else
{
if (mediaItemIds.Count == 1)
{
resultParts.Add(outerMIIDJoinVariable);
BindVar bindVar = new BindVar(bvNamespace.CreateNewBindVarName("V"), mediaItemIds.First(), typeof(Guid));
resultParts.Add(" = @" + bindVar.Name);
resultBindVars.Add(bindVar);
}
else
{
bool first = true;
ICollection <string> clusterExpressions = new List <string>();
foreach (IList <Guid> mediaItemIdsCluster in CollectionUtils.Cluster(mediaItemIds, MAX_IN_VALUES_SIZE))
{
IList <string> bindVarRefs = new List <string>(MAX_IN_VALUES_SIZE);
foreach (Guid mediaItemId in mediaItemIdsCluster)
{
BindVar bindVar = new BindVar(bvNamespace.CreateNewBindVarName("V"), mediaItemId, typeof(Guid));
bindVarRefs.Add("@" + bindVar.Name);
resultBindVars.Add(bindVar);
}
if (!first)
{
resultParts.Add(" OR ");
}
first = false;
resultParts.Add(outerMIIDJoinVariable);
resultParts.Add(" IN (" + StringUtils.Join(", ", bindVarRefs) + ")");
}
resultParts.Add(StringUtils.Join(" OR ", clusterExpressions));
}
}
return;
}
BooleanCombinationFilter boolFilter = filter as BooleanCombinationFilter;
if (boolFilter != null)
{
int numOperands = boolFilter.Operands.Count;
IEnumerator enumOperands = boolFilter.Operands.GetEnumerator();
if (!enumOperands.MoveNext())
{
return;
}
if (numOperands > 1)
{
resultParts.Add("(");
}
CompileStatementParts(miaManagement, (IFilter)enumOperands.Current, ns, bvNamespace,
requiredMIATypes, outerMIIDJoinVariable, tableJoins, resultParts, resultBindVars);
while (enumOperands.MoveNext())
{
switch (boolFilter.Operator)
{
case BooleanOperator.And:
resultParts.Add(" AND ");
break;
case BooleanOperator.Or:
resultParts.Add(" OR ");
break;
default:
throw new NotImplementedException(string.Format(
"Boolean filter operator '{0}' isn't supported by the media library", boolFilter.Operator));
}
CompileStatementParts(miaManagement, (IFilter)enumOperands.Current, ns, bvNamespace,
requiredMIATypes, outerMIIDJoinVariable, tableJoins, resultParts, resultBindVars);
}
if (numOperands > 1)
{
resultParts.Add(")");
}
return;
}
NotFilter notFilter = filter as NotFilter;
if (notFilter != null)
{
resultParts.Add("NOT (");
CompileStatementParts(miaManagement, notFilter.InnerFilter, ns, bvNamespace,
requiredMIATypes, outerMIIDJoinVariable, tableJoins, resultParts, resultBindVars);
resultParts.Add(")");
return;
}
FalseFilter falseFilter = filter as FalseFilter;
if (falseFilter != null)
{
resultParts.Add("1 = 2");
return;
}
// Must be done before checking IAttributeFilter - EmptyFilter is also an IAttributeFilter but must be
// compiled in a different way
EmptyFilter emptyFilter = filter as EmptyFilter;
if (emptyFilter != null)
{
MediaItemAspectMetadata.AttributeSpecification attributeType = emptyFilter.AttributeType;
requiredMIATypes.Add(attributeType.ParentMIAM);
Cardinality cardinality = attributeType.Cardinality;
if (cardinality == Cardinality.Inline || cardinality == Cardinality.ManyToOne)
{
resultParts.Add(new QueryAttribute(attributeType));
resultParts.Add(" IS NULL"); // MTO attributes are joined with left outer joins and thus can also be checked for NULL
}
else if (cardinality == Cardinality.OneToMany)
{
resultParts.Add("NOT EXISTS(");
resultParts.Add("SELECT V.");
resultParts.Add(MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME);
resultParts.Add(" FROM ");
resultParts.Add(miaManagement.GetMIACollectionAttributeTableName(attributeType));
resultParts.Add(" V WHERE V.");
resultParts.Add(MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME);
resultParts.Add("=");
resultParts.Add(outerMIIDJoinVariable);
resultParts.Add(")");
}
else if (cardinality == Cardinality.ManyToMany)
{
resultParts.Add("NOT EXISTS(");
resultParts.Add("SELECT NM.");
resultParts.Add(MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME);
resultParts.Add(" FROM ");
resultParts.Add(miaManagement.GetMIACollectionAttributeNMTableName(attributeType));
resultParts.Add(" NM INNER JOIN ");
resultParts.Add(miaManagement.GetMIACollectionAttributeTableName(attributeType));
resultParts.Add(" V ON NM.");
resultParts.Add(MIA_Management.FOREIGN_COLL_ATTR_ID_COL_NAME);
resultParts.Add(" = V.");
resultParts.Add(MIA_Management.FOREIGN_COLL_ATTR_ID_COL_NAME);
resultParts.Add(" WHERE NM.");
resultParts.Add(MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME);
resultParts.Add("=");
resultParts.Add(outerMIIDJoinVariable);
resultParts.Add(")");
}
return;
}
IAttributeFilter attributeFilter = filter as IAttributeFilter;
if (attributeFilter != null)
{
// For attribute filters, we have to create different kinds of expressions, depending on the
// cardinality of the attribute to be filtered.
// For Inline and MTO attributes, we simply create
//
// QA [Operator] [Comparison-Value]
//
// for OTM attributes, we create
//
// INNER JOIN [OTM-Value-Table] V ON V.MEDIA_ITEM_ID=[Outer-Join-Variable-Placeholder]
// WHERE [...] and V.VALUE [Operator] [Comparison-Value])
//
// for MTM attributes, we create
//
// INNER JOIN [MTM-NM-Table] NM ON NM.MEDIA_ITEM_ID=[Outer-Join-Variable-Placeholder]
// INNER JOIN [MTM-Value-Table] V ON NM.ID = V.ID
// WHERE [...] AND V.VALUE [Operator] [Comparison-Value])
MediaItemAspectMetadata.AttributeSpecification attributeType = attributeFilter.AttributeType;
requiredMIATypes.Add(attributeType.ParentMIAM);
Cardinality cardinality = attributeType.Cardinality;
if (cardinality == Cardinality.Inline || cardinality == Cardinality.ManyToOne)
{
BuildAttributeFilterExpression(attributeFilter, new QueryAttribute(attributeType), bvNamespace,
resultParts, resultBindVars);
}
else if (cardinality == Cardinality.OneToMany)
{
string joinTable = miaManagement.GetMIACollectionAttributeTableName(attributeType);
string attrName;
if (!_innerJoinedTables.TryGetValue(joinTable, out attrName))
{
TableQueryData tqd = new TableQueryData(joinTable);
tableJoins.Add(new TableJoin("LEFT OUTER JOIN", tqd,
new RequestedAttribute(tqd, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME), outerMIIDJoinVariable));
attrName = new RequestedAttribute(tqd, MIA_Management.COLL_ATTR_VALUE_COL_NAME).GetQualifiedName(ns);
_innerJoinedTables.Add(joinTable, attrName);
}
BuildAttributeFilterExpression(attributeFilter, attrName, bvNamespace, resultParts, resultBindVars);
}
else if (cardinality == Cardinality.ManyToMany)
{
string miaCollectionAttributeNMTableName = miaManagement.GetMIACollectionAttributeNMTableName(attributeType);
string attrName;
if (!_innerJoinedTables.TryGetValue(miaCollectionAttributeNMTableName, out attrName))
{
TableQueryData tqdMiaCollectionAttributeNMTable = new TableQueryData(miaCollectionAttributeNMTableName);
tableJoins.Add(new TableJoin("LEFT OUTER JOIN", tqdMiaCollectionAttributeNMTable,
new RequestedAttribute(tqdMiaCollectionAttributeNMTable, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME), outerMIIDJoinVariable));
TableQueryData tqdMiaCollectionAttributeTable = new TableQueryData(miaManagement.GetMIACollectionAttributeTableName(attributeType));
tableJoins.Add(new TableJoin("LEFT OUTER JOIN", tqdMiaCollectionAttributeTable,
new RequestedAttribute(tqdMiaCollectionAttributeNMTable, MIA_Management.FOREIGN_COLL_ATTR_ID_COL_NAME),
new RequestedAttribute(tqdMiaCollectionAttributeTable, MIA_Management.FOREIGN_COLL_ATTR_ID_COL_NAME)));
attrName = tqdMiaCollectionAttributeTable.GetAlias(ns) + "." + MIA_Management.COLL_ATTR_VALUE_COL_NAME;
_innerJoinedTables.Add(miaCollectionAttributeNMTableName, attrName);
}
BuildAttributeFilterExpression(attributeFilter, attrName, bvNamespace, resultParts, resultBindVars);
}
return;
}
throw new InvalidDataException("Filter type '{0}' isn't supported by the media library", filter.GetType().Name);
}
/// <summary>
/// Generates a statement to query the values of the complex <see cref="QueryAttribute"/>.
/// </summary>
/// <param name="valueAlias">Alias for the value column.</param>
/// <param name="mediaItemIdAlias">Alias for the ID of the media item to which the value belongs.</param>
/// <param name="statementStr">Statement which was built by this method.</param>
/// <param name="bindVars">Bind variables to be inserted into placeholders in the returned <paramref name="statementStr"/>.</param>
public void GenerateSqlStatement(out string mediaItemIdAlias, out string valueAlias,
out string statementStr, out IList <BindVar> bindVars)
{
Namespace ns = new Namespace();
BindVarNamespace bvNamespace = new BindVarNamespace();
// Contains a mapping of each queried (=selected or filtered) attribute to its request attribute instance
// data (which holds its requested query table instance)
IDictionary <QueryAttribute, RequestedAttribute> requestedAttributes = new Dictionary <QueryAttribute, RequestedAttribute>();
// Dictionary containing as key the requested MIAM instance OR attribute specification of cardinality MTO,
// mapped to the table query data to request its contents.
IDictionary <object, TableQueryData> tableQueries = new Dictionary <object, TableQueryData>();
// Contains the same tables as the tableQueries variable, but in order and enriched with table join data
IList <TableJoin> tableJoins = new List <TableJoin>();
// First create the request table query data for the external attribute table, which contains the foreign key
// to the MIA ID, and the request attribute for that MIA ID.
// We'll need the requested attribute as join attribute soon.
TableQueryData mainJoinTableQuery;
RequestedAttribute miaIdAttribute;
RequestedAttribute valueAttribute;
RequestedAttribute orderAttribute;
// Build main join table
switch (_queryAttribute.Cardinality)
{
case Cardinality.OneToMany:
mainJoinTableQuery = new TableQueryData(_miaManagement.GetMIACollectionAttributeTableName(_queryAttribute));
miaIdAttribute = new RequestedAttribute(mainJoinTableQuery, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME);
valueAttribute = new RequestedAttribute(mainJoinTableQuery, MIA_Management.COLL_ATTR_VALUE_COL_NAME);
orderAttribute = new RequestedAttribute(mainJoinTableQuery, MIA_Management.COLL_ATTR_VALUE_ORDER_COL_NAME);
break;
case Cardinality.ManyToMany:
mainJoinTableQuery = new TableQueryData(_miaManagement.GetMIACollectionAttributeNMTableName(_queryAttribute));
miaIdAttribute = new RequestedAttribute(mainJoinTableQuery, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME);
TableQueryData collAttrTableQuery = new TableQueryData(_miaManagement.GetMIACollectionAttributeTableName(_queryAttribute));
tableJoins.Add(new TableJoin("INNER JOIN", collAttrTableQuery,
new RequestedAttribute(mainJoinTableQuery, MIA_Management.FOREIGN_COLL_ATTR_ID_COL_NAME),
new RequestedAttribute(collAttrTableQuery, MIA_Management.FOREIGN_COLL_ATTR_ID_COL_NAME)));
valueAttribute = new RequestedAttribute(collAttrTableQuery, MIA_Management.COLL_ATTR_VALUE_COL_NAME);
orderAttribute = new RequestedAttribute(mainJoinTableQuery, MIA_Management.COLL_ATTR_VALUE_ORDER_COL_NAME);
break;
default:
throw new IllegalCallException("Media item aspect attributes of cardinality '{0}' cannot be requested via the {1}",
_queryAttribute.Cardinality, GetType().Name);
}
tableJoins.Insert(0, new TableJoin("INNER JOIN", mainJoinTableQuery, null, null)); // The first table join doesn't need the join attributes - see below
// Ensure that the tables for all necessary MIAs are requested first (INNER JOIN)
foreach (MediaItemAspectMetadata miaType in _necessaryRequestedMIAs)
{
if (tableQueries.ContainsKey(miaType))
{
// We only come here if miaType is the MIA of the requested attribute itself or if it was already queried as necessary MIA, so optimize redundant entry
continue;
}
//If any MultipleMediaItemAspect are requested, the joining below will cause duplicate values
//TableQueryData tqd = tableQueries[miaType] = TableQueryData.CreateTableQueryOfMIATable(_miaManagement, miaType);
//tableJoins.Add(new TableJoin("INNER JOIN", tqd, new RequestedAttribute(tqd, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME), miaIdAttribute));
}
CompiledFilter compiledFilter = new CompiledFilter(_miaManagement, _filter, _subqueryFilter, ns, bvNamespace, miaIdAttribute.GetQualifiedName(ns), tableJoins);
// Build table query data for each Inline attribute which is part of a filter
// + compile query attribute
foreach (QueryAttribute attr in compiledFilter.RequiredAttributes)
{
if (attr.Attr.Cardinality != Cardinality.Inline && attr.Attr.Cardinality != Cardinality.ManyToOne)
{
continue;
}
// Tables of Inline and MTO attributes, which are part of a filter, are joined with main table
RequestedAttribute ra;
RequestSimpleAttribute(attr, tableQueries, tableJoins, "LEFT OUTER JOIN", requestedAttributes,
null, miaIdAttribute, out ra);
}
StringBuilder result = new StringBuilder("SELECT ");
// Append MIA ID attribute only if no DISTINCT query is made
result.Append(_selectProjectionFunction == null ?
miaIdAttribute.GetDeclarationWithAlias(ns, out mediaItemIdAlias) :
miaIdAttribute.GetDeclarationWithAlias(ns, _selectProjectionFunction, out mediaItemIdAlias));
result.Append(", ");
// Selected attributes
result.Append(valueAttribute.GetDeclarationWithAlias(ns, out valueAlias));
string whereStr = compiledFilter.CreateSqlFilterCondition(ns, requestedAttributes, out bindVars);
result.Append(" FROM ");
bool firstJoinTable = true;
// Other joined tables
foreach (TableJoin tableJoin in tableJoins)
{
if (firstJoinTable)
{
result.Append(tableJoin.JoinedTable.GetDeclarationWithAlias(ns));
firstJoinTable = false;
}
else
{
result.Append(tableJoin.GetJoinDeclaration(ns));
}
result.Append(' ');
}
if (!string.IsNullOrEmpty(whereStr))
{
result.Append("WHERE ");
result.Append(whereStr);
}
if (orderAttribute != null)
{
result.Append(" ORDER BY ");
result.Append(orderAttribute.GetQualifiedName(ns));
}
statementStr = result.ToString();
}
/// <summary>
/// Generates a statement to query the distinct values of the complex <see cref="QueryAttribute"/>, together with their
/// occurence count.
/// </summary>
/// <param name="queryAttributeFilter">Additional filter which is defined on the <see cref="QueryAttribute"/>.
/// That filter COULD be part of the <see cref="Filter"/> but this method can highly optimize a filter on the
/// query attribute, so a filter on that attribute should be given in this parameter and should not be part of the <see cref="Filter"/>.
/// </param>
/// <param name="valueAlias">Alias for the value column.</param>
/// <param name="groupSizeAlias">Alias for the column containing the number of items in each group.</param>
/// <param name="statementStr">Statement which was built by this method.</param>
/// <param name="bindVars">Bind variables to be inserted into placeholders in the returned <paramref name="statementStr"/>.</param>
public void GenerateSqlGroupByStatement(IAttributeFilter queryAttributeFilter,
out string valueAlias, out string groupSizeAlias, out string statementStr, out IList<BindVar> bindVars)
{
Namespace ns = new Namespace();
BindVarNamespace bvNamespace = new BindVarNamespace();
// Contains a mapping of each queried (=selected or filtered) attribute to its request attribute instance
// data (which holds its requested query table instance)
IDictionary<QueryAttribute, RequestedAttribute> requestedAttributes = new Dictionary<QueryAttribute, RequestedAttribute>();
// Dictionary containing as key the requested MIAM instance OR attribute specification of cardinality MTO,
// mapped to the table query data to request its contents.
IDictionary<object, TableQueryData> tableQueries = new Dictionary<object, TableQueryData>();
// Contains the same tables as the tableQueries variable, but in order and enriched with table join data
IList<TableJoin> tableJoins = new List<TableJoin>();
// First create the request table query data for the MIA main table and the request attribute for the MIA ID.
// We'll need the requested attribute as join attribute soon.
MediaItemAspectMetadata queryMIAM = _queryAttribute.ParentMIAM;
TableQueryData miaTableQuery = new TableQueryData(_miaManagement.GetMIATableName(queryMIAM));
tableQueries.Add(queryMIAM, miaTableQuery);
RequestedAttribute miaIdAttribute = new RequestedAttribute(miaTableQuery, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME);
// Ensure that the tables for all necessary MIAs are requested first (INNER JOIN)
foreach (MediaItemAspectMetadata miaType in _necessaryRequestedMIAs)
{
TableQueryData tqd;
if (!tableQueries.TryGetValue(miaType, out tqd))
tqd = tableQueries[miaType] = TableQueryData.CreateTableQueryOfMIATable(_miaManagement, miaType);
if (miaType != queryMIAM)
tableJoins.Add(new TableJoin("INNER JOIN", tqd,
new RequestedAttribute(tqd, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME), miaIdAttribute));
}
CompiledFilter compiledFilter = new CompiledFilter(_miaManagement, _filter, ns, bvNamespace, miaIdAttribute.GetQualifiedName(ns), tableJoins);
// Build table query data for each Inline attribute which is part of a filter
// + compile query attribute
foreach (QueryAttribute attr in compiledFilter.RequiredAttributes)
{
if (attr.Attr.Cardinality != Cardinality.Inline && attr.Attr.Cardinality != Cardinality.ManyToOne)
continue;
// Tables of Inline and MTO attributes, which are part of a filter, are joined with main table
RequestedAttribute ra;
RequestSimpleAttribute(attr, tableQueries, tableJoins, "LEFT OUTER JOIN", requestedAttributes,
null, miaIdAttribute, out ra);
}
TableQueryData joinTableQuery;
RequestedAttribute valueAttribute;
// Build join table for value attribute
switch (_queryAttribute.Cardinality)
{
case Cardinality.OneToMany:
joinTableQuery = new TableQueryData(_miaManagement.GetMIACollectionAttributeTableName(_queryAttribute));
tableJoins.Add(new TableJoin("LEFT OUTER JOIN", joinTableQuery,
new RequestedAttribute(joinTableQuery, MIA_Management.FOREIGN_COLL_ATTR_ID_COL_NAME),
new RequestedAttribute(miaTableQuery, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME)));
valueAttribute = new RequestedAttribute(joinTableQuery, MIA_Management.COLL_ATTR_VALUE_COL_NAME);
break;
case Cardinality.ManyToMany:
joinTableQuery = new TableQueryData(_miaManagement.GetMIACollectionAttributeNMTableName(_queryAttribute));
tableJoins.Add(new TableJoin("LEFT OUTER JOIN", joinTableQuery,
new RequestedAttribute(joinTableQuery, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME),
new RequestedAttribute(miaTableQuery, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME)));
TableQueryData collAttrTableQuery = new TableQueryData(_miaManagement.GetMIACollectionAttributeTableName(_queryAttribute));
tableJoins.Add(new TableJoin("LEFT OUTER JOIN", collAttrTableQuery,
new RequestedAttribute(joinTableQuery, MIA_Management.FOREIGN_COLL_ATTR_ID_COL_NAME),
new RequestedAttribute(collAttrTableQuery, MIA_Management.FOREIGN_COLL_ATTR_ID_COL_NAME)));
valueAttribute = new RequestedAttribute(collAttrTableQuery, MIA_Management.COLL_ATTR_VALUE_COL_NAME);
break;
default:
throw new IllegalCallException("Media item aspect attributes of cardinality '{0}' cannot be requested via the {1}",
_queryAttribute.Cardinality, GetType().Name);
}
// Selected attributes
string valueDeclaration = _selectProjectionFunction == null ?
valueAttribute.GetDeclarationWithAlias(ns, out valueAlias) :
valueAttribute.GetDeclarationWithAlias(ns, _selectProjectionFunction, out valueAlias);
groupSizeAlias = "C";
StringBuilder result = new StringBuilder("SELECT COUNT(V.ID) ");
result.Append(groupSizeAlias);
result.Append(", V.");
result.Append(valueAlias);
result.Append(" FROM (");
result.Append("SELECT DISTINCT ");
result.Append(miaIdAttribute.GetQualifiedName(ns));
result.Append(" ID, ");
result.Append(valueDeclaration);
string whereStr = compiledFilter.CreateSqlFilterCondition(ns, requestedAttributes, out bindVars);
result.Append(" FROM ");
// Always request the mia table
result.Append(miaTableQuery.GetDeclarationWithAlias(ns));
result.Append(' ');
// Other joined tables
foreach (TableJoin tableJoin in tableJoins)
{
result.Append(tableJoin.GetJoinDeclaration(ns));
result.Append(' ');
}
if (!string.IsNullOrEmpty(whereStr) || queryAttributeFilter != null)
{
result.Append("WHERE ");
IList<string> filters = new List<string>(2);
if (!string.IsNullOrEmpty(whereStr))
filters.Add(whereStr);
if (queryAttributeFilter != null)
{
IList<object> resultParts = new List<object>();
CompiledFilter.BuildAttributeFilterExpression(queryAttributeFilter, valueAttribute.GetQualifiedName(ns), bvNamespace,
resultParts, bindVars);
string filterStr = CompiledFilter.CreateSimpleSqlFilterCondition(ns, resultParts, requestedAttributes);
filters.Add(filterStr);
}
result.Append(StringUtils.Join(" AND ", filters));
}
result.Append(") V GROUP BY V.");
result.Append(valueAlias);
statementStr = result.ToString();
}
/// <summary>
/// Generates a statement to query the values of the complex <see cref="QueryAttribute"/>.
/// </summary>
/// <param name="valueAlias">Alias for the value column.</param>
/// <param name="mediaItemIdAlias">Alias for the ID of the media item to which the value belongs.</param>
/// <param name="statementStr">Statement which was built by this method.</param>
/// <param name="bindVars">Bind variables to be inserted into placeholders in the returned <paramref name="statementStr"/>.</param>
public void GenerateSqlStatement(out string mediaItemIdAlias, out string valueAlias,
out string statementStr, out IList<BindVar> bindVars)
{
Namespace ns = new Namespace();
BindVarNamespace bvNamespace = new BindVarNamespace();
// Contains a mapping of each queried (=selected or filtered) attribute to its request attribute instance
// data (which holds its requested query table instance)
IDictionary<QueryAttribute, RequestedAttribute> requestedAttributes = new Dictionary<QueryAttribute, RequestedAttribute>();
// Dictionary containing as key the requested MIAM instance OR attribute specification of cardinality MTO,
// mapped to the table query data to request its contents.
IDictionary<object, TableQueryData> tableQueries = new Dictionary<object, TableQueryData>();
// Contains the same tables as the tableQueries variable, but in order and enriched with table join data
IList<TableJoin> tableJoins = new List<TableJoin>();
// First create the request table query data for the external attribute table, which contains the foreign key
// to the MIA ID, and the request attribute for that MIA ID.
// We'll need the requested attribute as join attribute soon.
TableQueryData mainJoinTableQuery;
RequestedAttribute miaIdAttribute;
RequestedAttribute valueAttribute;
// Build main join table
switch (_queryAttribute.Cardinality)
{
case Cardinality.OneToMany:
mainJoinTableQuery = new TableQueryData(_miaManagement.GetMIACollectionAttributeTableName(_queryAttribute));
miaIdAttribute = new RequestedAttribute(mainJoinTableQuery, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME);
valueAttribute = new RequestedAttribute(mainJoinTableQuery, MIA_Management.COLL_ATTR_VALUE_COL_NAME);
break;
case Cardinality.ManyToMany:
mainJoinTableQuery = new TableQueryData(_miaManagement.GetMIACollectionAttributeNMTableName(_queryAttribute));
miaIdAttribute = new RequestedAttribute(mainJoinTableQuery, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME);
TableQueryData collAttrTableQuery = new TableQueryData(_miaManagement.GetMIACollectionAttributeTableName(_queryAttribute));
tableJoins.Add(new TableJoin("INNER JOIN", collAttrTableQuery,
new RequestedAttribute(mainJoinTableQuery, MIA_Management.FOREIGN_COLL_ATTR_ID_COL_NAME),
new RequestedAttribute(collAttrTableQuery, MIA_Management.FOREIGN_COLL_ATTR_ID_COL_NAME)));
valueAttribute = new RequestedAttribute(collAttrTableQuery, MIA_Management.COLL_ATTR_VALUE_COL_NAME);
break;
default:
throw new IllegalCallException("Media item aspect attributes of cardinality '{0}' cannot be requested via the {1}",
_queryAttribute.Cardinality, GetType().Name);
}
tableJoins.Insert(0, new TableJoin("INNER JOIN", mainJoinTableQuery, null, null)); // The first table join doesn't need the join attributes - see below
// Ensure that the tables for all necessary MIAs are requested first (INNER JOIN)
foreach (MediaItemAspectMetadata miaType in _necessaryRequestedMIAs)
{
if (tableQueries.ContainsKey(miaType))
// We only come here if miaType is the MIA of the requested attribute itself or if it was already queried as necessary MIA, so optimize redundant entry
continue;
TableQueryData tqd = tableQueries[miaType] = TableQueryData.CreateTableQueryOfMIATable(_miaManagement, miaType);
tableJoins.Add(new TableJoin("INNER JOIN", tqd,
new RequestedAttribute(tqd, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME), miaIdAttribute));
}
CompiledFilter compiledFilter = new CompiledFilter(_miaManagement, _filter, ns, bvNamespace, miaIdAttribute.GetQualifiedName(ns), tableJoins);
// Build table query data for each Inline attribute which is part of a filter
// + compile query attribute
foreach (QueryAttribute attr in compiledFilter.RequiredAttributes)
{
if (attr.Attr.Cardinality != Cardinality.Inline && attr.Attr.Cardinality != Cardinality.ManyToOne)
continue;
// Tables of Inline and MTO attributes, which are part of a filter, are joined with main table
RequestedAttribute ra;
RequestSimpleAttribute(attr, tableQueries, tableJoins, "LEFT OUTER JOIN", requestedAttributes,
null, miaIdAttribute, out ra);
}
StringBuilder result = new StringBuilder("SELECT ");
// Append MIA ID attribute only if no DISTINCT query is made
result.Append(_selectProjectionFunction == null ?
miaIdAttribute.GetDeclarationWithAlias(ns, out mediaItemIdAlias) :
miaIdAttribute.GetDeclarationWithAlias(ns, _selectProjectionFunction, out mediaItemIdAlias));
result.Append(", ");
// Selected attributes
result.Append(valueAttribute.GetDeclarationWithAlias(ns, out valueAlias));
string whereStr = compiledFilter.CreateSqlFilterCondition(ns, requestedAttributes, out bindVars);
result.Append(" FROM ");
bool firstJoinTable = true;
// Other joined tables
foreach (TableJoin tableJoin in tableJoins)
{
if (firstJoinTable)
{
result.Append(tableJoin.JoinedTable.GetDeclarationWithAlias(ns));
firstJoinTable = false;
}
else
result.Append(tableJoin.GetJoinDeclaration(ns));
result.Append(' ');
}
if (!string.IsNullOrEmpty(whereStr))
{
result.Append("WHERE ");
result.Append(whereStr);
}
statementStr = result.ToString();
}
protected void GenerateSqlStatement(bool groupByValues,
IDictionary<MediaItemAspectMetadata, string> miamAliases,
out string mediaItemIdOrGroupSizeAlias,
out IDictionary<QueryAttribute, string> attributeAliases,
out string statementStr, out IList<BindVar> bindVars)
{
Namespace ns = new Namespace();
BindVarNamespace bvNamespace = new BindVarNamespace();
// Contains a mapping of each queried (=selected or filtered) attribute to its request attribute instance
// data (which holds its requested query table instance)
IDictionary<QueryAttribute, RequestedAttribute> requestedAttributes = new Dictionary<QueryAttribute, RequestedAttribute>();
attributeAliases = new Dictionary<QueryAttribute, string>();
// Contains a list of qualified attribute names for all select attributes - needed for GROUP BY-expressions
ICollection<string> qualifiedGroupByAliases = new List<string>();
// Contains a list of compiled select attribute declarations. We need this in a separate list (in contrast to using
// the selectAttributes list together with the compiledAttributes map) because it might be the case that
// an attribute is requested twice. In that rare case, we need a new alias name for it.
IList<string> selectAttributeDeclarations = new List<string>();
// Dictionary containing as key the requested MIAM instance OR attribute specification of cardinality MTO,
// mapped to the table query data to request its contents.
IDictionary<object, TableQueryData> tableQueries = new Dictionary<object, TableQueryData>();
// Contains the same tables as the tableQueries variable, but in order and enriched with table join data
IList<TableJoin> tableJoins = new List<TableJoin>();
// Contains all table query data for MIA type tables
IDictionary<MediaItemAspectMetadata, TableQueryData> miaTypeTableQueries = new Dictionary<MediaItemAspectMetadata, TableQueryData>();
// Albert, 2012-01-29: Optimized query, don't join with media items table, if we have necessary requested MIAs. In that case,
// we can use one of their media item ids.
//// First create the request table query data for the MIA main table and the request attribute for the MIA ID.
//// We'll need the requested attribute as join attribute soon.
//TableQueryData miaTableQuery = new TableQueryData(MediaLibrary_SubSchema.MEDIA_ITEMS_TABLE_NAME);
//RequestedAttribute miaIdAttribute = new RequestedAttribute(miaTableQuery, MediaLibrary_SubSchema.MEDIA_ITEMS_ITEM_ID_COL_NAME);
RequestedAttribute miaIdAttribute = null; // Lazy initialized below
// Contains CompiledSortInformation instances for each sort information instance
IList<CompiledSortInformation> compiledSortInformation = null;
// Ensure that the tables for all necessary MIAs are requested first (INNER JOIN)
foreach (MediaItemAspectMetadata miaType in _necessaryRequestedMIAs)
{
if (tableQueries.ContainsKey(miaType))
// We only come here if miaType was already queried as necessary MIA, so optimize redundant entry
continue;
TableQueryData tqd = tableQueries[miaType] = TableQueryData.CreateTableQueryOfMIATable(_miaManagement, miaType);
miaTypeTableQueries.Add(miaType, tqd);
RequestedAttribute ra;
// The first table join has invalid join attributes because miaIdAttribute is still null - but only the join table attribute is necessary
// for the the first table - see below
tableJoins.Add(new TableJoin("INNER JOIN", tqd,
ra = new RequestedAttribute(tqd, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME), miaIdAttribute));
if (miaIdAttribute == null)
miaIdAttribute = ra;
}
if (miaIdAttribute == null)
{ // If we didn't request any necessary MIA types, we have to add an artificial table for the miaIdAttribute
TableQueryData miaTableQuery = new TableQueryData(MediaLibrary_SubSchema.MEDIA_ITEMS_TABLE_NAME);
tableJoins.Add(new TableJoin("INNER JOIN", miaTableQuery, null, null)); // First table join has invalid join attributes - not needed for first table
miaIdAttribute = new RequestedAttribute(miaTableQuery, MediaLibrary_SubSchema.MEDIA_ITEMS_ITEM_ID_COL_NAME);
}
// Ensure that the tables for all optional MIAs are requested first (LEFT OUTER JOIN)
// That is necessary to make empty optional MIA types available in the result
foreach (MediaItemAspectMetadata miaType in _optionalRequestedMIAs)
{
if (tableQueries.ContainsKey(miaType))
// We only come here if miaType was already queried as necessary or optional MIA, so optimize redundant entry
continue;
TableQueryData tqd = tableQueries[miaType] = TableQueryData.CreateTableQueryOfMIATable(_miaManagement, miaType);
miaTypeTableQueries.Add(miaType, tqd);
tableJoins.Add(new TableJoin("LEFT OUTER JOIN", tqd,
new RequestedAttribute(tqd, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME), miaIdAttribute));
}
// Build table query data for each selected Inline and MTO attribute
// + select query attribute
// + add alias to selectAttributeDeclarations
foreach (QueryAttribute attr in _selectAttributes)
{
RequestedAttribute ra;
RequestSimpleAttribute(attr, tableQueries, tableJoins, "LEFT OUTER JOIN", requestedAttributes, miaTypeTableQueries,
miaIdAttribute, out ra);
string alias;
selectAttributeDeclarations.Add(_selectProjectionFunction == null ?
ra.GetDeclarationWithAlias(ns, out alias) :
ra.GetDeclarationWithAlias(ns, _selectProjectionFunction, out alias));
attributeAliases.Add(attr, alias);
qualifiedGroupByAliases.Add(ra.GetAlias(ns));
}
CompiledFilter compiledFilter = new CompiledFilter(_miaManagement, _filter, ns, bvNamespace, miaIdAttribute.GetQualifiedName(ns), tableJoins);
// Build table query data for each Inline attribute which is part of a filter
// + compile query attribute
foreach (QueryAttribute attr in compiledFilter.RequiredAttributes)
{
if (attr.Attr.Cardinality != Cardinality.Inline && attr.Attr.Cardinality != Cardinality.ManyToOne)
continue;
// Tables of Inline and MTO attributes, which are part of a filter, are joined with main table
RequestedAttribute ra;
RequestSimpleAttribute(attr, tableQueries, tableJoins, "LEFT OUTER JOIN", requestedAttributes,
miaTypeTableQueries, miaIdAttribute, out ra);
}
// Build table query data for each sort attribute
if (_sortInformation != null)
{
compiledSortInformation = new List<CompiledSortInformation>();
foreach (SortInformation sortInformation in _sortInformation)
{
MediaItemAspectMetadata.AttributeSpecification attr = sortInformation.AttributeType;
if (attr.Cardinality != Cardinality.Inline && attr.Cardinality != Cardinality.ManyToOne)
// Sorting can only be done for Inline and MTO attributes
continue;
RequestedAttribute ra;
RequestSimpleAttribute(new QueryAttribute(attr), tableQueries, tableJoins, "LEFT OUTER JOIN", requestedAttributes,
miaTypeTableQueries, miaIdAttribute, out ra);
compiledSortInformation.Add(new CompiledSortInformation(ra, sortInformation.Direction));
}
}
StringBuilder result = new StringBuilder("SELECT ");
string groupClause = StringUtils.Join(", ", qualifiedGroupByAliases.Select(alias => "V." + alias));
if (groupByValues)
{
mediaItemIdOrGroupSizeAlias = "C";
// Create an additional COUNT expression for the MEDIA_ITEMS.MEDIA_ITEM_ID in the GROUP BY-statement
result.Append("COUNT(V.C) ");
result.Append(mediaItemIdOrGroupSizeAlias);
if (!string.IsNullOrWhiteSpace(groupClause))
{
result.Append(", ");
result.Append(groupClause);
}
result.Append(" FROM (");
result.Append("SELECT DISTINCT ");
result.Append(miaIdAttribute.GetQualifiedName(ns));
result.Append(" C");
}
else
{
// Append plain attribute MEDIA_ITEMS.MEDIA_ITEM_ID if no GROUP BY-statement is requested
result.Append(miaIdAttribute.GetDeclarationWithAlias(ns, out mediaItemIdOrGroupSizeAlias));
// System attributes: Necessary to evaluate if a requested MIA is present for the media item
foreach (KeyValuePair<MediaItemAspectMetadata, TableQueryData> kvp in miaTypeTableQueries)
{
result.Append(", ");
string miamColumn = kvp.Value.GetAlias(ns) + "." + MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME;
result.Append(miamColumn);
string miamAlias = ns.GetOrCreate(miamColumn, "A");
result.Append(" ");
result.Append(miamAlias);
if (miamAlias != null)
miamAliases.Add(kvp.Key, miamAlias);
}
}
// Selected attributes
foreach (string selectAttr in selectAttributeDeclarations)
{
result.Append(", ");
result.Append(selectAttr);
}
string whereStr = compiledFilter.CreateSqlFilterCondition(ns, requestedAttributes, out bindVars);
result.Append(" FROM ");
bool firstJoinTable = true;
// Other joined tables
foreach (TableJoin tableJoin in tableJoins)
{
if (firstJoinTable)
{
result.Append(tableJoin.JoinedTable.GetDeclarationWithAlias(ns));
firstJoinTable = false;
}
else
result.Append(tableJoin.GetJoinDeclaration(ns));
result.Append(' ');
}
if (!string.IsNullOrEmpty(whereStr))
{
result.Append("WHERE ");
result.Append(whereStr);
}
if (groupByValues)
{
result.Append(") V");
if (qualifiedGroupByAliases.Count > 0)
{
result.Append(" GROUP BY ");
result.Append(groupClause);
}
}
else
{
if (compiledSortInformation != null && compiledSortInformation.Count > 0)
{
IEnumerable<string> sortCriteria = compiledSortInformation.Select(csi => csi.GetSortDeclaration(ns));
result.Append("ORDER BY ");
result.Append(StringUtils.Join(", ", sortCriteria));
}
}
statementStr = result.ToString();
}
protected void GenerateSubSelectSqlStatement(BindVarNamespace bvNamespace,
out string statementStr, out IList <BindVar> bindVars)
{
Namespace ns = new Namespace();
IDictionary <MediaItemAspectMetadata, string> miamAliases = new Dictionary <MediaItemAspectMetadata, string>();
// Contains a mapping of each queried (=selected or filtered) attribute to its request attribute instance
// data (which holds its requested query table instance)
IDictionary <QueryAttribute, RequestedAttribute> requestedAttributes = new Dictionary <QueryAttribute, RequestedAttribute>();
// Dictionary containing as key the requested MIAM instance OR attribute specification of cardinality MTO,
// mapped to the table query data to request its contents.
IDictionary <object, TableQueryData> tableQueries = new Dictionary <object, TableQueryData>();
// Contains the same tables as the tableQueries variable, but in order and enriched with table join data
IList <TableJoin> tableJoins = new List <TableJoin>();
// Contains all table query data for MIA type tables
IDictionary <MediaItemAspectMetadata, TableQueryData> miaTypeTableQueries = new Dictionary <MediaItemAspectMetadata, TableQueryData>();
RequestedAttribute miaIdAttribute = null; // Lazy initialized below
// Ensure that the tables for all necessary MIAs are requested first (INNER JOIN)
foreach (MediaItemAspectMetadata miaType in _necessaryRequestedMIAs)
{
if (miaType.IsTransientAspect)
{
continue;
}
if (tableQueries.ContainsKey(miaType))
{
// We only come here if miaType was already queried as necessary MIA, so optimize redundant entry
continue;
}
TableQueryData tqd = tableQueries[miaType] = TableQueryData.CreateTableQueryOfMIATable(_miaManagement, miaType);
miaTypeTableQueries.Add(miaType, tqd);
RequestedAttribute ra;
// The first table join has invalid join attributes because miaIdAttribute is still null - but only the join table attribute is necessary
// for the the first table - see below
tableJoins.Add(new TableJoin("INNER JOIN", tqd,
ra = new RequestedAttribute(tqd, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME), miaIdAttribute));
if (miaIdAttribute == null)
{
miaIdAttribute = ra;
}
}
if (miaIdAttribute == null)
{ // If we didn't request any necessary MIA types, we have to add an artificial table for the miaIdAttribute
TableQueryData miaTableQuery = new TableQueryData(MediaLibrary_SubSchema.MEDIA_ITEMS_TABLE_NAME);
tableJoins.Add(new TableJoin("INNER JOIN", miaTableQuery, null, null)); // First table join has invalid join attributes - not needed for first table
miaIdAttribute = new RequestedAttribute(miaTableQuery, MediaLibrary_SubSchema.MEDIA_ITEMS_ITEM_ID_COL_NAME);
}
// Ensure that the tables for all optional MIAs are requested first (LEFT OUTER JOIN)
// That is necessary to make empty optional MIA types available in the result
foreach (MediaItemAspectMetadata miaType in _optionalRequestedMIAs)
{
if (miaType.IsTransientAspect)
{
continue;
}
if (tableQueries.ContainsKey(miaType))
{
// We only come here if miaType was already queried as necessary or optional MIA, so optimize redundant entry
continue;
}
TableQueryData tqd = tableQueries[miaType] = TableQueryData.CreateTableQueryOfMIATable(_miaManagement, miaType);
miaTypeTableQueries.Add(miaType, tqd);
tableJoins.Add(new TableJoin("LEFT OUTER JOIN", tqd,
new RequestedAttribute(tqd, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME), miaIdAttribute));
}
CompiledFilter compiledFilter = CreateCompiledFilter(ns, bvNamespace, miaIdAttribute.GetQualifiedName(ns), tableJoins);
// Build table query data for each Inline attribute which is part of a filter
// + compile query attribute
foreach (QueryAttribute attr in compiledFilter.RequiredAttributes)
{
if (attr.Attr.ParentMIAM.IsTransientAspect)
{
continue;
}
if (attr.Attr.Cardinality != Cardinality.Inline && attr.Attr.Cardinality != Cardinality.ManyToOne)
{
continue;
}
// Tables of Inline and MTO attributes, which are part of a filter, are joined with main table
RequestedAttribute ra;
RequestSimpleAttribute(attr, tableQueries, tableJoins, "LEFT OUTER JOIN", requestedAttributes,
miaTypeTableQueries, miaIdAttribute, out ra);
}
StringBuilder result = new StringBuilder("SELECT ");
result.Append(miaIdAttribute.GetQualifiedName(ns));
string whereStr = compiledFilter.CreateSqlFilterCondition(ns, requestedAttributes, out bindVars);
result.Append(" FROM ");
bool firstJoinTable = true;
// Other joined tables
foreach (TableJoin tableJoin in tableJoins)
{
if (firstJoinTable)
{
result.Append(tableJoin.JoinedTable.GetDeclarationWithAlias(ns));
firstJoinTable = false;
}
else
{
result.Append(tableJoin.GetJoinDeclaration(ns));
}
result.Append(' ');
}
if (!string.IsNullOrEmpty(whereStr))
{
result.Append(" WHERE ");
result.Append(whereStr);
}
statementStr = result.ToString();
}
protected virtual void CompileStatementParts(MIA_Management miaManagement, IFilter filter, IFilter subqueryFilter, Namespace ns, BindVarNamespace bvNamespace,
ICollection <MediaItemAspectMetadata> requiredMIATypes, string outerMIIDJoinVariable, ICollection <TableJoin> tableJoins,
IList <object> resultParts, IList <BindVar> resultBindVars)
{
if (filter == null)
{
return;
}
MediaItemIdFilter mediaItemIdFilter = filter as MediaItemIdFilter;
if (mediaItemIdFilter != null)
{
ICollection <Guid> mediaItemIds = mediaItemIdFilter.MediaItemIds;
if (mediaItemIds.Count == 0)
{
resultParts.Add("1 = 2");
}
else
{
if (mediaItemIds.Count == 1)
{
resultParts.Add(outerMIIDJoinVariable);
BindVar bindVar = new BindVar(bvNamespace.CreateNewBindVarName("V"), mediaItemIds.First(), typeof(Guid));
resultParts.Add(" = @" + bindVar.Name);
resultBindVars.Add(bindVar);
}
else
{
bool first = true;
ICollection <string> clusterExpressions = new List <string>();
foreach (IList <Guid> mediaItemIdsCluster in CollectionUtils.Cluster(mediaItemIds, MAX_IN_VALUES_SIZE))
{
IList <string> bindVarRefs = new List <string>(MAX_IN_VALUES_SIZE);
foreach (Guid mediaItemId in mediaItemIdsCluster)
{
BindVar bindVar = new BindVar(bvNamespace.CreateNewBindVarName("V"), mediaItemId, typeof(Guid));
bindVarRefs.Add("@" + bindVar.Name);
resultBindVars.Add(bindVar);
}
if (!first)
{
resultParts.Add(" OR ");
}
first = false;
resultParts.Add(outerMIIDJoinVariable);
resultParts.Add(" IN (" + StringUtils.Join(", ", bindVarRefs) + ")");
}
resultParts.Add(StringUtils.Join(" OR ", clusterExpressions));
}
}
return;
}
BooleanCombinationFilter boolFilter = filter as BooleanCombinationFilter;
ICollection <IFilter> filterOperands = boolFilter?.Operands; //Work on collection reference to avoid chaning original
if (boolFilter != null && boolFilter.Operator == BooleanOperator.And && boolFilter.Operands.Count > 1 && boolFilter.Operands.ToList().All(x => x is IAttributeFilter))
{
ICollection <IFilter> remainingOperands = new List <IFilter>();
// Special case to do multiple MIA boolean logic first
IDictionary <Guid, ICollection <IAttributeFilter> > multiGroups = new Dictionary <Guid, ICollection <IAttributeFilter> >();
foreach (IAttributeFilter operand in filterOperands)
{
MultipleMediaItemAspectMetadata mmiam = operand.AttributeType.ParentMIAM as MultipleMediaItemAspectMetadata;
if (mmiam != null)
{
Guid key = operand.AttributeType.ParentMIAM.AspectId;
if (!multiGroups.ContainsKey(key))
{
multiGroups[key] = new List <IAttributeFilter>();
}
multiGroups[key].Add(operand);
}
else
{
remainingOperands.Add(operand);
}
}
if (multiGroups.Keys.Count > 0)
{
bool firstGroup = true;
foreach (ICollection <IAttributeFilter> filterGroup in multiGroups.Values)
{
if (firstGroup)
{
firstGroup = false;
}
else
{
resultParts.Add(" AND ");
}
bool firstItem = true;
foreach (IAttributeFilter filterItem in filterGroup)
{
MediaItemAspectMetadata.AttributeSpecification attributeType = filterItem.AttributeType;
if (firstItem)
{
resultParts.Add(outerMIIDJoinVariable);
resultParts.Add(" IN(");
resultParts.Add("SELECT ");
resultParts.Add(MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME);
resultParts.Add(" FROM ");
resultParts.Add(miaManagement.GetMIATableName(attributeType.ParentMIAM));
resultParts.Add(" WHERE ");
firstItem = false;
}
else
{
resultParts.Add(" AND ");
}
//Empty filter needs to be handled differently to other IAttribute filters
if (filterItem is EmptyFilter)
{
resultParts.Add(miaManagement.GetMIAAttributeColumnName(attributeType));
resultParts.Add(" IS NULL");
}
else
{
BuildAttributeFilterExpression(filterItem, miaManagement.GetMIAAttributeColumnName(attributeType), bvNamespace, resultParts, resultBindVars);
}
}
resultParts.Add(")");
}
// Process remaining operands ?
if (remainingOperands.Count == 0)
{
return;
}
resultParts.Add(" AND ");
filterOperands = remainingOperands;
}
}
if (boolFilter != null)
{
int numOperands = filterOperands.Count;
IEnumerator enumOperands = filterOperands.GetEnumerator();
if (!enumOperands.MoveNext())
{
return;
}
if (numOperands > 1)
{
resultParts.Add("(");
}
CompileStatementParts(miaManagement, (IFilter)enumOperands.Current, subqueryFilter, ns, bvNamespace,
requiredMIATypes, outerMIIDJoinVariable, tableJoins, resultParts, resultBindVars);
while (enumOperands.MoveNext())
{
switch (boolFilter.Operator)
{
case BooleanOperator.And:
resultParts.Add(" AND ");
break;
case BooleanOperator.Or:
resultParts.Add(" OR ");
break;
default:
throw new NotImplementedException(string.Format(
"Boolean filter operator '{0}' isn't supported by the media library", boolFilter.Operator));
}
CompileStatementParts(miaManagement, (IFilter)enumOperands.Current, subqueryFilter, ns, bvNamespace,
requiredMIATypes, outerMIIDJoinVariable, tableJoins, resultParts, resultBindVars);
}
if (numOperands > 1)
{
resultParts.Add(")");
}
return;
}
NotFilter notFilter = filter as NotFilter;
if (notFilter != null)
{
resultParts.Add("NOT (");
CompileStatementParts(miaManagement, notFilter.InnerFilter, subqueryFilter, ns, bvNamespace,
requiredMIATypes, outerMIIDJoinVariable, tableJoins, resultParts, resultBindVars);
resultParts.Add(")");
return;
}
FalseFilter falseFilter = filter as FalseFilter;
if (falseFilter != null)
{
resultParts.Add("1 = 2");
return;
}
// Must be done before checking IAttributeFilter - EmptyFilter is also an IAttributeFilter but must be
// compiled in a different way
EmptyFilter emptyFilter = filter as EmptyFilter;
if (emptyFilter != null)
{
MediaItemAspectMetadata.AttributeSpecification attributeType = emptyFilter.AttributeType;
requiredMIATypes.Add(attributeType.ParentMIAM);
Cardinality cardinality = attributeType.Cardinality;
if (cardinality == Cardinality.Inline || cardinality == Cardinality.ManyToOne)
{
resultParts.Add(new QueryAttribute(attributeType));
resultParts.Add(" IS NULL"); // MTO attributes are joined with left outer joins and thus can also be checked for NULL
}
else if (cardinality == Cardinality.OneToMany)
{
resultParts.Add("NOT EXISTS(");
resultParts.Add("SELECT 1");
resultParts.Add(" FROM ");
resultParts.Add(miaManagement.GetMIACollectionAttributeTableName(attributeType));
resultParts.Add(" V WHERE V.");
resultParts.Add(MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME);
resultParts.Add("=");
resultParts.Add(outerMIIDJoinVariable);
resultParts.Add(")");
}
else if (cardinality == Cardinality.ManyToMany)
{
resultParts.Add("NOT EXISTS(");
resultParts.Add("SELECT 1");
resultParts.Add(" FROM ");
resultParts.Add(miaManagement.GetMIACollectionAttributeNMTableName(attributeType));
resultParts.Add(" NM INNER JOIN ");
resultParts.Add(miaManagement.GetMIACollectionAttributeTableName(attributeType));
resultParts.Add(" V ON NM.");
resultParts.Add(MIA_Management.FOREIGN_COLL_ATTR_ID_COL_NAME);
resultParts.Add(" = V.");
resultParts.Add(MIA_Management.FOREIGN_COLL_ATTR_ID_COL_NAME);
resultParts.Add(" WHERE NM.");
resultParts.Add(MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME);
resultParts.Add("=");
resultParts.Add(outerMIIDJoinVariable);
resultParts.Add(")");
}
return;
}
// Must be done before checking IAttributeFilter - EmptyUserDataFilter is also an IAttributeFilter but must be
// compiled in a different way
EmptyUserDataFilter emptyUserDataFilter = filter as EmptyUserDataFilter;
if (emptyUserDataFilter != null)
{
BindVar userIdVar = new BindVar(bvNamespace.CreateNewBindVarName("V"), emptyUserDataFilter.UserProfileId, typeof(Guid));
resultParts.Add("NOT EXISTS(");
resultParts.Add("SELECT 1");
resultParts.Add(" FROM ");
resultParts.Add(UserProfileDataManagement_SubSchema.USER_MEDIA_ITEM_DATA_TABLE_NAME);
resultParts.Add(" WHERE ");
resultParts.Add(UserProfileDataManagement_SubSchema.USER_PROFILE_ID_COL_NAME);
resultParts.Add(" = @" + userIdVar.Name);
resultBindVars.Add(userIdVar);
resultParts.Add(" AND ");
resultParts.Add(UserProfileDataManagement_SubSchema.USER_DATA_KEY_COL_NAME);
resultParts.Add(" = '");
resultParts.Add(emptyUserDataFilter.UserDataKey);
resultParts.Add("' AND ");
resultParts.Add(UserProfileDataManagement_SubSchema.USER_DATA_VALUE_COL_NAME);
resultParts.Add(" IS NOT NULL ");
resultParts.Add(" AND ");
resultParts.Add(UserProfileDataManagement_SubSchema.USER_DATA_VALUE_COL_NAME);
resultParts.Add(" <> '' ");
resultParts.Add(" AND ");
resultParts.Add(MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME);
resultParts.Add("=");
resultParts.Add(outerMIIDJoinVariable);
resultParts.Add(")");
return;
}
AbstractRelationshipFilter relationshipFilter = filter as AbstractRelationshipFilter;
if (relationshipFilter != null)
{
resultParts.Add(outerMIIDJoinVariable);
resultParts.Add(" IN(");
BuildRelationshipSubquery(relationshipFilter, subqueryFilter, miaManagement, bvNamespace, resultParts, resultBindVars);
resultParts.Add(")");
return;
}
RelationalUserDataFilter relationalUserDataFilter = filter as RelationalUserDataFilter;
if (relationalUserDataFilter != null)
{
BindVar userIdVar = new BindVar(bvNamespace.CreateNewBindVarName("V"), relationalUserDataFilter.UserProfileId, typeof(Guid));
BindVar bindVar = new BindVar(bvNamespace.CreateNewBindVarName("V"), relationalUserDataFilter.FilterValue, typeof(string));
resultParts.Add("(EXISTS(");
resultParts.Add("SELECT 1");
resultParts.Add(" FROM ");
resultParts.Add(UserProfileDataManagement_SubSchema.USER_MEDIA_ITEM_DATA_TABLE_NAME);
resultParts.Add(" WHERE ");
resultParts.Add(UserProfileDataManagement_SubSchema.USER_PROFILE_ID_COL_NAME);
resultParts.Add(" = @" + userIdVar.Name);
resultBindVars.Add(userIdVar);
resultParts.Add(" AND ");
resultParts.Add(UserProfileDataManagement_SubSchema.USER_DATA_KEY_COL_NAME);
resultParts.Add(" = '");
resultParts.Add(relationalUserDataFilter.UserDataKey);
resultParts.Add("' AND (");
resultParts.Add(UserProfileDataManagement_SubSchema.USER_DATA_VALUE_COL_NAME);
switch (relationalUserDataFilter.Operator)
{
case RelationalOperator.EQ:
resultParts.Add(" = ");
break;
case RelationalOperator.NEQ:
resultParts.Add(" <> ");
break;
case RelationalOperator.LT:
resultParts.Add(" < ");
break;
case RelationalOperator.LE:
resultParts.Add(" <= ");
break;
case RelationalOperator.GT:
resultParts.Add(" > ");
break;
case RelationalOperator.GE:
resultParts.Add(" >= ");
break;
default:
throw new NotImplementedException(string.Format(
"Relational user data filter operator '{0}' isn't supported by the media library", relationalUserDataFilter.Operator));
}
resultParts.Add("@" + bindVar.Name);
resultBindVars.Add(bindVar);
if (relationalUserDataFilter.IncludeEmpty)
{
resultParts.Add(" OR ");
resultParts.Add(UserProfileDataManagement_SubSchema.USER_DATA_VALUE_COL_NAME);
resultParts.Add(" IS NULL ");
}
resultParts.Add(") AND ");
resultParts.Add(MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME);
resultParts.Add("=");
resultParts.Add(outerMIIDJoinVariable);
resultParts.Add(")");
if (relationalUserDataFilter.IncludeEmpty)
{
resultParts.Add(" OR NOT EXISTS(");
resultParts.Add("SELECT 1");
resultParts.Add(" FROM ");
resultParts.Add(UserProfileDataManagement_SubSchema.USER_MEDIA_ITEM_DATA_TABLE_NAME);
resultParts.Add(" WHERE ");
resultParts.Add(UserProfileDataManagement_SubSchema.USER_PROFILE_ID_COL_NAME);
resultParts.Add(" = @" + userIdVar.Name);
resultParts.Add(" AND ");
resultParts.Add(UserProfileDataManagement_SubSchema.USER_DATA_KEY_COL_NAME);
resultParts.Add(" = '");
resultParts.Add(relationalUserDataFilter.UserDataKey);
resultParts.Add("'");
resultParts.Add(" AND ");
resultParts.Add(MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME);
resultParts.Add("=");
resultParts.Add(outerMIIDJoinVariable);
resultParts.Add(")");
}
resultParts.Add(")");
return;
}
IAttributeFilter attributeFilter = filter as IAttributeFilter;
if (attributeFilter != null)
{
MediaItemAspectMetadata.AttributeSpecification attributeType = attributeFilter.AttributeType;
if (attributeType.ParentMIAM is MultipleMediaItemAspectMetadata)
{
resultParts.Add(outerMIIDJoinVariable);
resultParts.Add(" IN(");
resultParts.Add("SELECT ");
resultParts.Add(MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME);
resultParts.Add(" FROM ");
resultParts.Add(miaManagement.GetMIATableName(attributeType.ParentMIAM));
resultParts.Add(" WHERE ");
BuildAttributeFilterExpression(attributeFilter, miaManagement.GetMIAAttributeColumnName(attributeType), bvNamespace, resultParts, resultBindVars);
resultParts.Add(")");
return;
}
// For attribute filters, we have to create different kinds of expressions, depending on the
// cardinality of the attribute to be filtered.
// For Inline and MTO attributes, we simply create
//
// QA [Operator] [Comparison-Value]
//
// for OTM attributes, we create
//
// INNER JOIN [OTM-Value-Table] V ON V.MEDIA_ITEM_ID=[Outer-Join-Variable-Placeholder]
// WHERE [...] and V.VALUE [Operator] [Comparison-Value])
//
// for MTM attributes, we create
//
// INNER JOIN [MTM-NM-Table] NM ON NM.MEDIA_ITEM_ID=[Outer-Join-Variable-Placeholder]
// INNER JOIN [MTM-Value-Table] V ON NM.ID = V.ID
// WHERE [...] AND V.VALUE [Operator] [Comparison-Value])
requiredMIATypes.Add(attributeType.ParentMIAM);
Cardinality cardinality = attributeType.Cardinality;
if (cardinality == Cardinality.Inline || cardinality == Cardinality.ManyToOne)
{
BuildAttributeFilterExpression(attributeFilter, new QueryAttribute(attributeType), bvNamespace,
resultParts, resultBindVars);
}
else if (cardinality == Cardinality.OneToMany)
{
string joinTable = miaManagement.GetMIACollectionAttributeTableName(attributeType);
string attrName;
if (!_innerJoinedTables.TryGetValue(joinTable, out attrName))
{
TableQueryData tqd = new TableQueryData(joinTable);
tableJoins.Add(new TableJoin("LEFT OUTER JOIN", tqd,
new RequestedAttribute(tqd, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME), outerMIIDJoinVariable));
attrName = new RequestedAttribute(tqd, MIA_Management.COLL_ATTR_VALUE_COL_NAME).GetQualifiedName(ns);
_innerJoinedTables.Add(joinTable, attrName);
}
BuildAttributeFilterExpression(attributeFilter, attrName, bvNamespace, resultParts, resultBindVars);
}
else if (cardinality == Cardinality.ManyToMany)
{
string miaCollectionAttributeNMTableName = miaManagement.GetMIACollectionAttributeNMTableName(attributeType);
string attrName;
if (!_innerJoinedTables.TryGetValue(miaCollectionAttributeNMTableName, out attrName))
{
TableQueryData tqdMiaCollectionAttributeNMTable = new TableQueryData(miaCollectionAttributeNMTableName);
tableJoins.Add(new TableJoin("LEFT OUTER JOIN", tqdMiaCollectionAttributeNMTable,
new RequestedAttribute(tqdMiaCollectionAttributeNMTable, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME), outerMIIDJoinVariable));
TableQueryData tqdMiaCollectionAttributeTable = new TableQueryData(miaManagement.GetMIACollectionAttributeTableName(attributeType));
tableJoins.Add(new TableJoin("LEFT OUTER JOIN", tqdMiaCollectionAttributeTable,
new RequestedAttribute(tqdMiaCollectionAttributeNMTable, MIA_Management.FOREIGN_COLL_ATTR_ID_COL_NAME),
new RequestedAttribute(tqdMiaCollectionAttributeTable, MIA_Management.FOREIGN_COLL_ATTR_ID_COL_NAME)));
attrName = tqdMiaCollectionAttributeTable.GetAlias(ns) + "." + MIA_Management.COLL_ATTR_VALUE_COL_NAME;
_innerJoinedTables.Add(miaCollectionAttributeNMTableName, attrName);
}
BuildAttributeFilterExpression(attributeFilter, attrName, bvNamespace, resultParts, resultBindVars);
}
return;
}
throw new InvalidDataException("Filter type '{0}' isn't supported by the media library", filter.GetType().Name);
}
public TableJoin(string joinType, TableQueryData table, RequestedAttribute joinAttr1, RequestedAttribute joinAttr2) :
this(joinType, table, (object)joinAttr1, (object)joinAttr2)
{
}
/// <summary>
/// Generates a statement to query the distinct values of the complex <see cref="QueryAttribute"/>, together with their
/// occurence count.
/// </summary>
/// <param name="queryAttributeFilter">Additional filter which is defined on the <see cref="QueryAttribute"/>.
/// That filter COULD be part of the <see cref="Filter"/> but this method can highly optimize a filter on the
/// query attribute, so a filter on that attribute should be given in this parameter and should not be part of the <see cref="Filter"/>.
/// </param>
/// <param name="valueAlias">Alias for the value column.</param>
/// <param name="groupSizeAlias">Alias for the column containing the number of items in each group.</param>
/// <param name="statementStr">Statement which was built by this method.</param>
/// <param name="bindVars">Bind variables to be inserted into placeholders in the returned <paramref name="statementStr"/>.</param>
public void GenerateSqlGroupByStatement(IAttributeFilter queryAttributeFilter,
out string valueAlias, out string groupSizeAlias, out string statementStr, out IList <BindVar> bindVars)
{
Namespace ns = new Namespace();
BindVarNamespace bvNamespace = new BindVarNamespace();
// Contains a mapping of each queried (=selected or filtered) attribute to its request attribute instance
// data (which holds its requested query table instance)
IDictionary <QueryAttribute, RequestedAttribute> requestedAttributes = new Dictionary <QueryAttribute, RequestedAttribute>();
// Dictionary containing as key the requested MIAM instance OR attribute specification of cardinality MTO,
// mapped to the table query data to request its contents.
IDictionary <object, TableQueryData> tableQueries = new Dictionary <object, TableQueryData>();
// Contains the same tables as the tableQueries variable, but in order and enriched with table join data
IList <TableJoin> tableJoins = new List <TableJoin>();
// First create the request table query data for the MIA main table and the request attribute for the MIA ID.
// We'll need the requested attribute as join attribute soon.
MediaItemAspectMetadata queryMIAM = _queryAttribute.ParentMIAM;
TableQueryData miaTableQuery = new TableQueryData(_miaManagement.GetMIATableName(queryMIAM));
tableQueries.Add(queryMIAM, miaTableQuery);
RequestedAttribute miaIdAttribute = new RequestedAttribute(miaTableQuery, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME);
// Ensure that the tables for all necessary MIAs are requested first (INNER JOIN)
foreach (MediaItemAspectMetadata miaType in _necessaryRequestedMIAs)
{
TableQueryData tqd;
if (!tableQueries.TryGetValue(miaType, out tqd))
{
tqd = tableQueries[miaType] = TableQueryData.CreateTableQueryOfMIATable(_miaManagement, miaType);
}
if (miaType != queryMIAM)
{
tableJoins.Add(new TableJoin("INNER JOIN", tqd,
new RequestedAttribute(tqd, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME), miaIdAttribute));
}
}
CompiledFilter compiledFilter = new CompiledFilter(_miaManagement, _filter, _subqueryFilter, ns, bvNamespace, miaIdAttribute.GetQualifiedName(ns), tableJoins);
// Build table query data for each Inline attribute which is part of a filter
// + compile query attribute
foreach (QueryAttribute attr in compiledFilter.RequiredAttributes)
{
if (attr.Attr.Cardinality != Cardinality.Inline && attr.Attr.Cardinality != Cardinality.ManyToOne)
{
continue;
}
// Tables of Inline and MTO attributes, which are part of a filter, are joined with main table
RequestedAttribute ra;
RequestSimpleAttribute(attr, tableQueries, tableJoins, "LEFT OUTER JOIN", requestedAttributes,
null, miaIdAttribute, out ra);
}
TableQueryData joinTableQuery;
RequestedAttribute valueAttribute;
// Build join table for value attribute
switch (_queryAttribute.Cardinality)
{
case Cardinality.OneToMany:
joinTableQuery = new TableQueryData(_miaManagement.GetMIACollectionAttributeTableName(_queryAttribute));
tableJoins.Add(new TableJoin("LEFT OUTER JOIN", joinTableQuery,
new RequestedAttribute(joinTableQuery, MIA_Management.FOREIGN_COLL_ATTR_ID_COL_NAME),
new RequestedAttribute(miaTableQuery, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME)));
valueAttribute = new RequestedAttribute(joinTableQuery, MIA_Management.COLL_ATTR_VALUE_COL_NAME);
break;
case Cardinality.ManyToMany:
joinTableQuery = new TableQueryData(_miaManagement.GetMIACollectionAttributeNMTableName(_queryAttribute));
tableJoins.Add(new TableJoin("LEFT OUTER JOIN", joinTableQuery,
new RequestedAttribute(joinTableQuery, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME),
new RequestedAttribute(miaTableQuery, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME)));
TableQueryData collAttrTableQuery = new TableQueryData(_miaManagement.GetMIACollectionAttributeTableName(_queryAttribute));
tableJoins.Add(new TableJoin("LEFT OUTER JOIN", collAttrTableQuery,
new RequestedAttribute(joinTableQuery, MIA_Management.FOREIGN_COLL_ATTR_ID_COL_NAME),
new RequestedAttribute(collAttrTableQuery, MIA_Management.FOREIGN_COLL_ATTR_ID_COL_NAME)));
valueAttribute = new RequestedAttribute(collAttrTableQuery, MIA_Management.COLL_ATTR_VALUE_COL_NAME);
break;
default:
throw new IllegalCallException("Media item aspect attributes of cardinality '{0}' cannot be requested via the {1}",
_queryAttribute.Cardinality, GetType().Name);
}
// Selected attributes
string valueDeclaration = _selectProjectionFunction == null?
valueAttribute.GetDeclarationWithAlias(ns, out valueAlias) :
valueAttribute.GetDeclarationWithAlias(ns, _selectProjectionFunction, out valueAlias);
groupSizeAlias = "C";
StringBuilder result = new StringBuilder("SELECT COUNT(V.ID) ");
result.Append(groupSizeAlias);
result.Append(", V.");
result.Append(valueAlias);
result.Append(" FROM (");
result.Append("SELECT DISTINCT ");
result.Append(miaIdAttribute.GetQualifiedName(ns));
result.Append(" ID, ");
result.Append(valueDeclaration);
string whereStr = compiledFilter.CreateSqlFilterCondition(ns, requestedAttributes, out bindVars);
result.Append(" FROM ");
// Always request the mia table
result.Append(miaTableQuery.GetDeclarationWithAlias(ns));
result.Append(' ');
// Other joined tables
foreach (TableJoin tableJoin in tableJoins)
{
result.Append(tableJoin.GetJoinDeclaration(ns));
result.Append(' ');
}
if (!string.IsNullOrEmpty(whereStr) || queryAttributeFilter != null)
{
result.Append("WHERE ");
IList <string> filters = new List <string>(2);
if (!string.IsNullOrEmpty(whereStr))
{
filters.Add(whereStr);
}
if (queryAttributeFilter != null)
{
IList <object> resultParts = new List <object>();
CompiledFilter.BuildAttributeFilterExpression(queryAttributeFilter, valueAttribute.GetQualifiedName(ns), bvNamespace,
resultParts, bindVars);
string filterStr = CompiledFilter.CreateSimpleSqlFilterCondition(ns, resultParts, requestedAttributes);
filters.Add(filterStr);
}
result.Append(StringUtils.Join(" AND ", filters));
}
result.Append(") V GROUP BY V.");
result.Append(valueAlias);
statementStr = result.ToString();
}
protected void GenerateSingleMIASqlStatement(bool groupByValues,
IDictionary <MediaItemAspectMetadata, string> miamAliases,
out string mediaItemIdOrGroupSizeAlias,
out IDictionary <QueryAttribute, string> attributeAliases,
out string statementStr, out IList <BindVar> bindVars)
{
Namespace ns = new Namespace();
BindVarNamespace bvNamespace = new BindVarNamespace();
// Contains a mapping of each queried (=selected or filtered) attribute to its request attribute instance
// data (which holds its requested query table instance)
IDictionary <QueryAttribute, RequestedAttribute> requestedAttributes = new Dictionary <QueryAttribute, RequestedAttribute>();
attributeAliases = new Dictionary <QueryAttribute, string>();
// Contains a list of qualified attribute names for all select attributes - needed for GROUP BY-expressions
ICollection <string> qualifiedGroupByAliases = new List <string>();
// Contains a list of compiled select attribute declarations. We need this in a separate list (in contrast to using
// the selectAttributes list together with the compiledAttributes map) because it might be the case that
// an attribute is requested twice. In that rare case, we need a new alias name for it.
IList <string> selectAttributeDeclarations = new List <string>();
// Dictionary containing as key the requested MIAM instance OR attribute specification of cardinality MTO,
// mapped to the table query data to request its contents.
IDictionary <object, TableQueryData> tableQueries = new Dictionary <object, TableQueryData>();
// Contains the same tables as the tableQueries variable, but in order and enriched with table join data
IList <TableJoin> tableJoins = new List <TableJoin>();
// Contains all table query data for MIA type tables
IDictionary <MediaItemAspectMetadata, TableQueryData> miaTypeTableQueries = new Dictionary <MediaItemAspectMetadata, TableQueryData>();
//Used to check whether a required MulpleMIA exists
IList <TableQueryData> miaExistsTables = new List <TableQueryData>();
RequestedAttribute miaIdAttribute = null; // Lazy initialized below
// Contains CompiledSortInformation instances for each sort information instance
IList <CompiledSortInformation> compiledSortInformation = null;
// Ensure that the tables for all necessary MIAs are requested first (INNER JOIN)
foreach (MediaItemAspectMetadata miaType in _necessaryRequestedMIAs)
{
if (miaType.IsTransientAspect)
{
continue;
}
if (tableQueries.ContainsKey(miaType))
{
// We only come here if miaType was already queried as necessary MIA, so optimize redundant entry
continue;
}
if (miaType is MultipleMediaItemAspectMetadata)
{
miaExistsTables.Add(TableQueryData.CreateTableQueryOfMIATable(_miaManagement, miaType));
continue;
}
TableQueryData tqd = tableQueries[miaType] = TableQueryData.CreateTableQueryOfMIATable(_miaManagement, miaType);
miaTypeTableQueries.Add(miaType, tqd);
RequestedAttribute ra;
// The first table join has invalid join attributes because miaIdAttribute is still null - but only the join table attribute is necessary
// for the the first table - see below
tableJoins.Add(new TableJoin("INNER JOIN", tqd,
ra = new RequestedAttribute(tqd, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME), miaIdAttribute));
if (miaIdAttribute == null)
{
miaIdAttribute = ra;
}
}
if (miaIdAttribute == null)
{ // If we didn't request any necessary MIA types, we have to add an artificial table for the miaIdAttribute
TableQueryData miaTableQuery = new TableQueryData(MediaLibrary_SubSchema.MEDIA_ITEMS_TABLE_NAME);
tableJoins.Add(new TableJoin("INNER JOIN", miaTableQuery, null, null)); // First table join has invalid join attributes - not needed for first table
miaIdAttribute = new RequestedAttribute(miaTableQuery, MediaLibrary_SubSchema.MEDIA_ITEMS_ITEM_ID_COL_NAME);
}
// Ensure that the tables for all optional MIAs are requested first (LEFT OUTER JOIN)
// That is necessary to make empty optional MIA types available in the result
foreach (MediaItemAspectMetadata miaType in _optionalRequestedMIAs)
{
if (miaType.IsTransientAspect)
{
continue;
}
if (tableQueries.ContainsKey(miaType))
{
// We only come here if miaType was already queried as necessary or optional MIA, so optimize redundant entry
continue;
}
if (miaType is MultipleMediaItemAspectMetadata)
{
continue;
}
TableQueryData tqd = tableQueries[miaType] = TableQueryData.CreateTableQueryOfMIATable(_miaManagement, miaType);
miaTypeTableQueries.Add(miaType, tqd);
tableJoins.Add(new TableJoin("LEFT OUTER JOIN", tqd,
new RequestedAttribute(tqd, MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME), miaIdAttribute));
}
// Build table query data for each selected Inline and MTO attribute
// + select query attribute
// + add alias to selectAttributeDeclarations
foreach (QueryAttribute attr in _selectAttributes)
{
if (attr.Attr.ParentMIAM.IsTransientAspect)
{
continue;
}
//Multiple MIAs will be handled later
if (attr.Attr.ParentMIAM is MultipleMediaItemAspectMetadata)
{
continue;
}
RequestedAttribute ra;
RequestSimpleAttribute(attr, tableQueries, tableJoins, "LEFT OUTER JOIN", requestedAttributes, miaTypeTableQueries,
miaIdAttribute, out ra);
string alias;
selectAttributeDeclarations.Add(_selectProjectionFunction == null ?
ra.GetDeclarationWithAlias(ns, out alias) :
ra.GetDeclarationWithAlias(ns, _selectProjectionFunction, out alias));
attributeAliases.Add(attr, alias);
qualifiedGroupByAliases.Add(ra.GetAlias(ns));
}
string subSql;
GenerateSubSelectSqlStatement(bvNamespace, out subSql, out bindVars);
// Build table query data for each sort attribute
if (_sortInformation != null)
{
compiledSortInformation = new List <CompiledSortInformation>();
BindVar userVar = null;
foreach (ISortInformation sortInformation in _sortInformation)
{
if (AddAttributeSortInformation(sortInformation, miaIdAttribute, requestedAttributes, miaTypeTableQueries, tableQueries, tableJoins, compiledSortInformation))
{
continue;
}
if (AddChildAggregateAttributeSortInformation(sortInformation, ns, bvNamespace, miaIdAttribute, tableJoins, compiledSortInformation, bindVars))
{
continue;
}
if (AddDataSortInformation(sortInformation, miaIdAttribute, tableJoins, compiledSortInformation, bindVars, ref userVar))
{
continue;
}
}
}
//Build sql statement
StringBuilder result = new StringBuilder("SELECT ");
string groupClause = StringUtils.Join(", ", qualifiedGroupByAliases.Select(alias => "V." + alias));
if (groupByValues)
{
mediaItemIdOrGroupSizeAlias = "C";
// Create an additional COUNT expression for the MEDIA_ITEMS.MEDIA_ITEM_ID in the GROUP BY-statement
result.Append("COUNT(V.C) ");
result.Append(mediaItemIdOrGroupSizeAlias);
if (!string.IsNullOrWhiteSpace(groupClause))
{
result.Append(", ");
result.Append(groupClause);
}
result.Append(" FROM (");
result.Append("SELECT DISTINCT ");
result.Append(miaIdAttribute.GetQualifiedName(ns));
result.Append(" C");
}
else
{
// Append plain attribute MEDIA_ITEMS.MEDIA_ITEM_ID if no GROUP BY-statement is requested
result.Append(miaIdAttribute.GetDeclarationWithAlias(ns, out mediaItemIdOrGroupSizeAlias));
// System attributes: Necessary to evaluate if a requested MIA is present for the media item
foreach (KeyValuePair <MediaItemAspectMetadata, TableQueryData> kvp in miaTypeTableQueries)
{
result.Append(", ");
string miamColumn = kvp.Value.GetAlias(ns) + "." + MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME;
result.Append(miamColumn);
string miamAlias = ns.GetOrCreate(miamColumn, "A");
result.Append(" ");
result.Append(miamAlias);
if (miamAlias != null)
{
miamAliases.Add(kvp.Key, miamAlias);
}
}
}
// Selected attributes
foreach (string selectAttr in selectAttributeDeclarations)
{
result.Append(", ");
result.Append(selectAttr);
}
result.Append(" FROM ");
bool firstJoinTable = true;
// Other joined tables
foreach (TableJoin tableJoin in tableJoins)
{
if (firstJoinTable)
{
result.Append(tableJoin.JoinedTable.GetDeclarationWithAlias(ns));
firstJoinTable = false;
}
else
{
result.Append(tableJoin.GetJoinDeclaration(ns));
}
result.Append(' ');
}
bool whereAdded = false;
if (!string.IsNullOrEmpty(subSql))
{
result.Append(" WHERE ");
result.Append(miaIdAttribute.GetQualifiedName(ns));
result.Append($" IN({subSql}) ");
whereAdded = true;
}
if (miaExistsTables.Count > 0)
{
foreach (TableQueryData tqd in miaExistsTables)
{
if (!whereAdded)
{
result.Append(" WHERE ");
}
else
{
result.Append(" AND ");
}
whereAdded = true;
result.Append("EXISTS(SELECT 1 FROM ");
result.Append(tqd.TableName);
result.Append(" WHERE ");
result.Append(MIA_Management.MIA_MEDIA_ITEM_ID_COL_NAME);
result.Append("=");
result.Append(miaIdAttribute.GetQualifiedName(ns));
result.Append(")");
}
}
if (groupByValues)
{
result.Append(") V");
if (qualifiedGroupByAliases.Count > 0)
{
result.Append(" GROUP BY ");
result.Append(groupClause);
}
}
else
{
if (compiledSortInformation != null && compiledSortInformation.Count > 0)
{
IEnumerable <string> sortCriteria = compiledSortInformation.Select(csi => csi.GetSortDeclaration(ns));
result.Append(" ORDER BY ");
result.Append(StringUtils.Join(", ", sortCriteria));
}
}
statementStr = result.ToString();
}