private static object GetScalar(string fieldName, string tableAlias, CSAggregate aggregate, CSFilter queryFilter, string orderBy)
{
CSSchema schema = CSSchema.Get(typeof(T));
if (tableAlias == null)
{
tableAlias = CSNameGenerator.NextTableAlias;
}
if (orderBy == null)
{
orderBy = "";
}
string aggregateExpr = null;
int maxRows = 0;
switch (aggregate)
{
case CSAggregate.None: aggregateExpr = "{0}"; maxRows = 1; break;
case CSAggregate.Sum: aggregateExpr = "sum({0})"; break;
case CSAggregate.SumDistinct: aggregateExpr = "sum(distinct {0})"; break;
case CSAggregate.Count: aggregateExpr = "count(*)"; break;
case CSAggregate.CountDistinct: aggregateExpr = "count(distinct {0})"; break;
case CSAggregate.Avg: aggregateExpr = "avg({0})"; break;
case CSAggregate.AvgDistinct: aggregateExpr = "avg(distinct {0})"; break;
case CSAggregate.Max: aggregateExpr = "max({0})"; break;
case CSAggregate.Min: aggregateExpr = "min({0})"; break;
}
CSJoinList joins = new CSJoinList();
if (fieldName != "*")
{
fieldName = CSExpressionParser.ParseFilter(fieldName, schema, tableAlias, joins);
}
string whereFilter = CSExpressionParser.ParseFilter(queryFilter.Expression, schema, tableAlias, joins);
orderBy = CSExpressionParser.ParseOrderBy(orderBy, schema, tableAlias, joins);
string sqlQuery = schema.DB.BuildSelectSQL(schema.TableName, tableAlias, new[] { String.Format(aggregateExpr, fieldName) }, null, joins.BuildJoinExpressions(), whereFilter, orderBy, 1, maxRows, false, false);
return(schema.DB.GetScalar(sqlQuery, queryFilter.Parameters));
}
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;
}
internal static string Parse(CSSchema schema, string input, string tableAlias, CSJoinList joins)
{
if (input == "")
{
return(input);
}
List <Token> tokens = PreParse(input);
QueryExpression rootQuery = new QueryExpression(schema, tableAlias);
rootQuery.Joins = joins;
QueryExpression finalQuery = Parse(rootQuery, tokens, 0, tokens.Count);
return(finalQuery.Expression);
}
internal static string ParseOrderBy(string expression, CSSchema schema, string tableAlias, CSJoinList joinList)
{
//joinList = new CSJoinList();
if (expression.Trim().Length < 1)
{
return(expression);
}
string parsedExpression = "";
string[] terms = expression.Split(',');
foreach (string term in terms)
{
if (term.Length < 1)
{
continue;
}
bool ascending = true;
string fieldName = term;
if (term.EndsWith("-"))
{
ascending = false;
}
if (term.EndsWith("+") || term.EndsWith("-"))
{
fieldName = term.Substring(0, term.Length - 1);
}
if (parsedExpression.Length > 1)
{
parsedExpression += ",";
}
parsedExpression += ParseFilter(fieldName, schema, tableAlias, joinList);
if (!ascending)
{
parsedExpression += " DESC";
}
}
return(parsedExpression);
}
internal static string ParseFilter(string expressionText, CSSchema schema, string tableAlias, CSJoinList joins)
{
return(Parse(schema, expressionText, tableAlias, joins));
}
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);
}
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);
}
