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IDataAccessAdapterGetDbCount Method (IEntityCollection2, IRelationPredicateBucket, IGroupByCollection)

Gets the estimated number of objects returned by a query for objects to store in the entity collection passed in, using the filter and groupby clause specified. The number is estimated as duplicate objects can be present in the plain query results, but will be filtered out when the query result is transformed into objects.

Namespace:  SD.LLBLGen.Pro.ORMSupportClasses
Assembly:  SD.LLBLGen.Pro.ORMSupportClasses (in SD.LLBLGen.Pro.ORMSupportClasses.dll) Version: 5.6.0.0 (5.6.19.0117)
Syntax
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int GetDbCount(
	IEntityCollection2 collection,
	IRelationPredicateBucket filter,
	IGroupByCollection groupByClause
)

Parameters

collection
Type: SD.LLBLGen.Pro.ORMSupportClassesIEntityCollection2
EntityCollection instance which will be fetched 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.

Return Value

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