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DataAccessAdapterBaseGetDbCount Method (IEntityFields2, IRelationPredicateBucket, IGroupByCollection, Boolean)

Gets the number of rows returned by a query for the fields specified, using the filter and groupby clause specified.

Namespace:  SD.LLBLGen.Pro.ORMSupportClasses
Assembly:  SD.LLBLGen.Pro.ORMSupportClasses (in SD.LLBLGen.Pro.ORMSupportClasses.dll) Version: 5.7.0.0 (5.7.0)
Syntax
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public override int GetDbCount(
	IEntityFields2 fields,
	IRelationPredicateBucket filter,
	IGroupByCollection groupByClause,
	bool allowDuplicates
)

Parameters

fields
Type: SD.LLBLGen.Pro.ORMSupportClassesIEntityFields2
IEntityFields2 instance with the fields returned by the query to get the rowcount for
filter
Type: SD.LLBLGen.Pro.ORMSupportClassesIRelationPredicateBucket
filter to use by the query to get the rowcount for
groupByClause
Type: SD.LLBLGen.Pro.ORMSupportClassesIGroupByCollection
The list of fields to group by on. When not specified or an empty collection is specified, no group by clause is added to the query. A check is performed for each field in the selectList. If a field in the selectList is not present in the groupByClause collection, an exception is thrown.
allowDuplicates
Type: SystemBoolean
When true, it will not filter out duplicate rows, otherwise it will DISTINCT duplicate rows.

Return Value

Type: Int32
the number of rows the query for the fields specified, using the filter, relations and groupbyClause specified.

Implements

IDataAccessAdapterGetDbCount(IEntityFields2, IRelationPredicateBucket, IGroupByCollection, Boolean)
Remarks
This method performs a SELECT COUNT(*) FROM (actual query) and executes that as a scalar query. This construct is not supported on Firebird. You can try to achieve the same results by using GetScalar and AggregateFunction.CountRow, though those results can differ from the result returned by GetDbCount if you use a group by clause.
See Also