internal static List <PrefetchField> GetPrefetchFieldsOne(CSTable table, List <string> fieldList, List <string> aliasList, CSJoinList joinList, string[] prefetchPaths)
{
List <PrefetchField> prefetchFields = new List <PrefetchField>();
foreach (CSSchemaField schemaField in table.Schema.Fields)
{
bool prefetch = schemaField.Prefetch;
string fieldName = schemaField.Name;
prefetch |= (prefetchPaths != null && prefetchPaths.Any(s =>
{
if (s.IndexOf('.') > 0)
{
s = s.Substring(0, s.IndexOf('.'));
}
return(s == fieldName);
}));
if (schemaField.Relation != null && schemaField.Relation.RelationType == CSSchemaRelationType.ManyToOne && prefetch)
{
CSJoin join = new CSJoin(schemaField.Relation, table.TableAlias);
joinList.Add(join);
PrefetchField prefetchField = new PrefetchField();
prefetchField.SchemaField = schemaField;
foreach (string columnName in schemaField.Relation.ForeignSchema.ColumnsToRead)
{
string alias = CSNameGenerator.NextFieldAlias;
fieldList.Add(join.RightAlias + "." + columnName);
aliasList.Add(alias);
prefetchField.AliasMap[alias] = columnName;
}
prefetchFields.Add(prefetchField);
}
}
return(prefetchFields);
}
private void Populate()
{
if (Populated)
{
return;
}
if (Relation != null && RelationObject != null && Relation.RelationType == CSSchemaRelationType.OneToMany && RelationObject.IsNew)
{
_objectArray = new List <TObjectType>();
Populated = true;
return;
}
CSTable table = new CSTable(Schema);
//string mainAlias = CSHelper.NextTableAlias;
List <string> columnList = new List <string>(Schema.ColumnsToRead.Count);
List <string> aliasList = new List <string>(Schema.ColumnsToRead.Count);
Dictionary <string, string> aliasMap = new Dictionary <string, string>(StringComparer.OrdinalIgnoreCase);
foreach (string columnName in Schema.ColumnsToRead)
{
string alias = CSNameGenerator.NextFieldAlias;
columnList.Add(table.TableAlias + "." + columnName);
aliasList.Add(alias);
aliasMap.Add(alias, columnName);
}
CSJoinList filterJoins = new CSJoinList();
List <PrefetchField> prefetchFields = CSObject.GetPrefetchFieldsOne(table, columnList, aliasList, filterJoins, PrefetchPaths);
CSFilter whereFilter;
if (PrefetchFilter != null)
{
whereFilter = new CSFilter(DB.QuoteField(table.TableAlias + "." + PrefetchFilter.ForeignKey) + " in (" + PrefetchFilter.InStatement + ")", PrefetchFilter.Parameters);
}
else
{
string parsedFilterExpression = CSExpressionParser.ParseFilter(Filter.Expression, Schema, table.TableAlias, filterJoins);
whereFilter = new CSFilter(parsedFilterExpression, Filter.Parameters);
CSFilter relationFilter = BuildRelationFilter(table.TableAlias);
whereFilter = whereFilter.And(CSExpressionParser.ParseFilter(relationFilter.Expression, Schema, table.TableAlias, filterJoins), relationFilter.Parameters);
}
string parsedOrderBy = CSExpressionParser.ParseOrderBy(OrderBy, Schema, table.TableAlias, filterJoins);
string sqlQuery = DB.BuildSelectSQL(table.TableName, table.TableAlias, columnList.ToArray(), aliasList.ToArray(), filterJoins.BuildJoinExpressions(), whereFilter.Expression, parsedOrderBy, StartRecord, MaxRecords, true, false);
_objectArray = GetObjects(sqlQuery, whereFilter.Parameters, aliasMap, prefetchFields);
if (Schema.KeyColumns.Count == 1)
{
string columnName = Schema.KeyColumns[0].Name;
_objectMap = new Dictionary <object, TObjectType>();
foreach (TObjectType csObject in _objectArray)
{
_objectMap.Add(csObject.Data["#" + columnName].Value, csObject);
}
}
foreach (CSSchemaField prefetchField in GetPrefetchFieldsMany())
{
CSRelation relation = prefetchField.Relation;
Dictionary <object, TObjectType> prefetchMap = new Dictionary <object, TObjectType>();
// Creates empty lists in each object of this list
foreach (TObjectType csObject in _objectArray)
{
prefetchMap[csObject.Data["#" + relation.LocalKey].Value] = csObject;
CSList relationCollection = (CSList)Activator.CreateInstance(prefetchField.FieldType);
relationCollection.Relation = relation;
relationCollection.RelationObject = csObject;
relationCollection.InitializePrefetch();
csObject.Data[prefetchField.Name].ValueDirect = relationCollection;
csObject.Data[prefetchField.Name].ValueState = CSFieldValueState.Read;
}
Type objectType = relation.ForeignSchema.ClassType;
CSList csList = (CSList)Activator.CreateInstance(typeof(CSList <>).MakeGenericType(objectType));
//string prefetchTableAlias = CSNameGenerator.NextTableAlias;
string prefetchFilter = DB.BuildSelectSQL(table.TableName, table.TableAlias, new[] { table.TableAlias + "." + relation.LocalKey }, new[] { CSNameGenerator.NextFieldAlias }, filterJoins.BuildJoinExpressions(), whereFilter.Expression, parsedOrderBy, StartRecord, MaxRecords, true, true);
csList.PrefetchFilter = new PrefetchFilter(relation.ForeignKey, prefetchFilter, whereFilter.Parameters);
if (PrefetchPaths != null && PrefetchPaths.Length > 0)
{
List <string> newPrefetchPaths = new List <string>();
foreach (string path in PrefetchPaths)
{
if (path.StartsWith(prefetchField.Name + "."))
{
newPrefetchPaths.Add(path.Substring(prefetchField.Name.Length + 1));
}
}
if (newPrefetchPaths.Count > 0)
{
csList.PrefetchPaths = newPrefetchPaths.ToArray();
}
}
foreach (CSObject csObject in csList)
{
object localKey = csObject.Data["#" + relation.ForeignKey].ValueDirect;
CSList relationCollection = (CSList)prefetchMap[localKey].Data[prefetchField.Name].ValueDirect;
relationCollection.AddFromPrefetch(csObject);
}
}
Populated = true;
}
private static object EvalVariable(string var, QueryExpression parentQuery)
{
Match match = _regexVar.Match(var);
if (!match.Success)
{
throw new CSExpressionException("Object [" + var + "] is unknown");
}
List <string> fieldNames = new List <string>();
foreach (Capture capture in match.Groups["Object"].Captures)
{
fieldNames.Add(capture.Value);
}
QueryExpression subExpression = null;
CSTable currentTable = parentQuery.Table;
string fieldName = null;
for (int i = 0; i < fieldNames.Count; i++)
{
bool isLast = (i == fieldNames.Count - 1);
CSJoin currentJoin = null;
CSSchemaField schemaField = currentTable.Schema.Fields[fieldNames[i]];
if (schemaField == null)
{
throw new CSException("Error in expression. [" + fieldNames[i] + "] is not a valid field name");
}
if (schemaField.Relation != null)
{
switch (schemaField.Relation.RelationType)
{
case CSSchemaRelationType.OneToMany:
{
if (subExpression != null)
{
throw new CSExpressionException("Error in expression [" + var + "]: Multiple *ToMany relations");
}
subExpression = new QueryExpression(schemaField.Relation.ForeignSchema);
subExpression.Joins = new CSJoinList();
subExpression.Expression = currentTable.TableAlias + "." + currentTable.Schema.DB.QuoteField(schemaField.Relation.LocalKey) + "=" + subExpression.Table.TableAlias + "." + currentTable.Schema.DB.QuoteField(schemaField.Relation.ForeignKey);
}
break;
case CSSchemaRelationType.ManyToMany:
{
if (subExpression != null)
{
throw new CSExpressionException("Error in expression [" + var + "]: Multiple *ToMany relations");
}
subExpression = new QueryExpression(schemaField.Relation.ForeignSchema);
subExpression.Joins = new CSJoinList();
currentJoin = new CSJoin();
currentJoin.LeftSchema = schemaField.Relation.ForeignSchema;
currentJoin.LeftTable = subExpression.Table.TableName;
currentJoin.LeftAlias = subExpression.Table.TableAlias;
currentJoin.RightTable = schemaField.Relation.LinkTable;
currentJoin.RightAlias = CSNameGenerator.NextTableAlias;
currentJoin.LeftColumn = schemaField.Relation.ForeignKey;
currentJoin.RightColumn = schemaField.Relation.ForeignLinkKey;
currentJoin.Type = CSJoinType.Inner;
subExpression.Joins.Add(currentJoin);
subExpression.Expression = currentJoin.RightAlias + "." + currentTable.Schema.DB.QuoteField(schemaField.Relation.LocalLinkKey) + "=" + currentTable.TableAlias + "." + currentTable.Schema.DB.QuoteField(schemaField.Relation.LocalKey);
currentJoin = null;
}
break;
case CSSchemaRelationType.ManyToOne:
{
if (!isLast)
{
if (subExpression != null) // meaning we already encountered a *toMany relation
{
currentJoin = new CSJoin(schemaField.Relation, subExpression.Table.TableAlias);
if (subExpression.Joins.Contains(currentJoin))
{
currentJoin = subExpression.Joins.GetExistingJoin(currentJoin);
}
else
{
subExpression.Joins.Add(currentJoin);
}
}
else
{
currentJoin = new CSJoin(schemaField.Relation, currentTable.TableAlias);
if (parentQuery.Joins.Contains(currentJoin))
{
currentJoin = parentQuery.Joins.GetExistingJoin(currentJoin);
}
else
{
parentQuery.Joins.Add(currentJoin);
}
}
}
}
break;
}
if (!isLast)
{
if (currentJoin != null)
{
currentTable = new CSTable(schemaField.Relation.ForeignSchema, currentJoin.RightAlias);
}
else
{
if (subExpression != null)
{
currentTable = new CSTable(schemaField.Relation.ForeignSchema, subExpression.Table.TableAlias);
}
else
{
currentTable = new CSTable(schemaField.Relation.ForeignSchema);
}
}
}
else
{
fieldName = currentTable.Schema.DB.QuoteField(currentTable.TableAlias + "." + schemaField.Relation.LocalKey);
}
}
else
{
fieldName = currentTable.Schema.DB.QuoteField(currentTable.TableAlias + "." + schemaField.MappedColumn.Name);
}
}
if (subExpression != null)
{
subExpression.FieldName = fieldName;
return(subExpression);
}
else
{
//if (fieldName != null)
return(fieldName);
}
}
public QueryExpression(CSSchema schema)
{
Table = new CSTable(schema);
}
public QueryExpression(CSSchema schema, string tableAlias)
{
Table = new CSTable(schema, tableAlias);
}
internal bool ReadFields(CSStringCollection columnList, CSStringCollection keyList, List <object> valueList)
{
List <string> fieldList = new List <string>();
List <string> aliasList = new List <string>();
Dictionary <string, string> fieldAliasMap = new Dictionary <string, string>(StringComparer.OrdinalIgnoreCase);
CSFilter whereClause = new CSFilter();
CSTable table = new CSTable(_schema);
CSParameterCollection parameters = new CSParameterCollection();
foreach (CSSchemaColumn schemaColumn in _schema.Columns)
{
if (keyList.Contains(schemaColumn.Name))
{
CSParameter parameter = parameters.Add();
parameter.Value = valueList[keyList.IndexOf(schemaColumn.Name)];
whereClause = whereClause.And(table.TableAlias + "." + _schema.DB.QuoteField(schemaColumn.Name) + "=" + parameter.Name);
_fieldData["#" + schemaColumn.Name].ValueDirect = parameter.Value;
_fieldData["#" + schemaColumn.Name].ValueState = CSFieldValueState.Read;
}
else if (columnList.Contains(schemaColumn.Name))
{
string alias = CSNameGenerator.NextFieldAlias;
fieldList.Add(table.TableAlias + "." + schemaColumn.Name);
aliasList.Add(alias);
fieldAliasMap[alias] = schemaColumn.Name;
}
}
/** Build query for prefetch of relations **/
CSJoinList joinList = new CSJoinList();
List <PrefetchField> prefetchFields = GetPrefetchFieldsOne(table, fieldList, aliasList, joinList, null);
if (whereClause.Expression.Length == 0)
{
return(false);
}
if (fieldList.Count == 0)
{
return(true);
}
string sqlQuery = _schema.DB.BuildSelectSQL(table.TableName, table.TableAlias, fieldList.ToArray(), aliasList.ToArray(), joinList.BuildJoinExpressions(), whereClause.Expression, null, 1, 1, true, false);
using (CSTransaction csTransaction = new CSTransaction(_schema))
{
using (ICSDbReader dataReader = _schema.DB.CreateReader(sqlQuery, parameters))
{
if (!dataReader.Read())
{
return(false);
}
FromDataReader(dataReader, fieldAliasMap);
foreach (PrefetchField prefetchField in prefetchFields)
{
ReadRelationToOne(prefetchField.SchemaField, dataReader, prefetchField.AliasMap);
}
}
csTransaction.Commit();
}
return(true);
}
private static object EvalVariable(string var, QueryExpression parentQuery)
{
Match match = _regexVar.Match(var);
if (!match.Success)
throw new CSExpressionException("Object [" + var + "] is unknown");
List<string> fieldNames = new List<string>();
foreach (Capture capture in match.Groups["Object"].Captures)
fieldNames.Add(capture.Value);
QueryExpression subExpression = null;
CSTable currentTable = parentQuery.Table;
string fieldName = null;
for (int i = 0; i < fieldNames.Count; i++)
{
bool isLast = (i == fieldNames.Count - 1);
CSJoin currentJoin = null;
CSSchemaField schemaField = currentTable.Schema.Fields[fieldNames[i]];
if (schemaField == null)
throw new CSException("Error in expression. [" + fieldNames[i] + "] is not a valid field name");
if (schemaField.Relation != null)
{
switch (schemaField.Relation.RelationType)
{
case CSSchemaRelationType.OneToMany:
{
if (subExpression != null)
throw new CSExpressionException("Error in expression [" + var + "]: Multiple *ToMany relations");
subExpression = new QueryExpression(schemaField.Relation.ForeignSchema);
subExpression.Joins = new CSJoinList();
subExpression.Expression = currentTable.TableAlias + "." + currentTable.Schema.DB.QuoteField(schemaField.Relation.LocalKey) + "=" + subExpression.Table.TableAlias + "." + currentTable.Schema.DB.QuoteField(schemaField.Relation.ForeignKey);
}
break;
case CSSchemaRelationType.ManyToMany:
{
if (subExpression != null)
throw new CSExpressionException("Error in expression [" + var + "]: Multiple *ToMany relations");
subExpression = new QueryExpression(schemaField.Relation.ForeignSchema);
subExpression.Joins = new CSJoinList();
currentJoin = new CSJoin();
currentJoin.LeftSchema = schemaField.Relation.ForeignSchema;
currentJoin.LeftTable = subExpression.Table.TableName;
currentJoin.LeftAlias = subExpression.Table.TableAlias;
currentJoin.RightTable = schemaField.Relation.LinkTable;
currentJoin.RightAlias = CSNameGenerator.NextTableAlias;
currentJoin.LeftColumn = schemaField.Relation.ForeignKey;
currentJoin.RightColumn = schemaField.Relation.ForeignLinkKey;
currentJoin.Type = CSJoinType.Inner;
subExpression.Joins.Add(currentJoin);
subExpression.Expression = currentJoin.RightAlias + "." + currentTable.Schema.DB.QuoteField(schemaField.Relation.LocalLinkKey) + "=" + currentTable.TableAlias + "." + currentTable.Schema.DB.QuoteField(schemaField.Relation.LocalKey);
currentJoin = null;
}
break;
case CSSchemaRelationType.ManyToOne:
{
if (!isLast)
{
if (subExpression != null) // meaning we already encountered a *toMany relation
{
currentJoin = new CSJoin(schemaField.Relation, subExpression.Table.TableAlias);
if (subExpression.Joins.Contains(currentJoin))
currentJoin = subExpression.Joins.GetExistingJoin(currentJoin);
else
subExpression.Joins.Add(currentJoin);
}
else
{
currentJoin = new CSJoin(schemaField.Relation, currentTable.TableAlias);
if (parentQuery.Joins.Contains(currentJoin))
currentJoin = parentQuery.Joins.GetExistingJoin(currentJoin);
else
parentQuery.Joins.Add(currentJoin);
}
}
}
break;
}
if (!isLast)
{
if (currentJoin != null)
currentTable = new CSTable(schemaField.Relation.ForeignSchema, currentJoin.RightAlias);
else
{
if (subExpression != null)
currentTable = new CSTable(schemaField.Relation.ForeignSchema, subExpression.Table.TableAlias);
else
currentTable = new CSTable(schemaField.Relation.ForeignSchema);
}
}
else
{
fieldName = currentTable.Schema.DB.QuoteField(currentTable.TableAlias + "." + schemaField.Relation.LocalKey);
}
}
else
{
fieldName = currentTable.Schema.DB.QuoteField(currentTable.TableAlias + "." + schemaField.MappedColumn.Name);
}
}
if (subExpression != null)
{
subExpression.FieldName = fieldName;
return subExpression;
}
else
{
//if (fieldName != null)
return fieldName;
}
}
public QueryExpression(CSSchema schema)
{
Table = new CSTable(schema);
}
public QueryExpression(CSSchema schema, string tableAlias)
{
Table = new CSTable(schema, tableAlias);
}
