0
我有LinqToSql和PredicateBuilderLinqToSql生成對數據庫中的不正確的查詢
一個問題我有下面的代碼段
Dim vQuery As IQueryable(Of Table1) = pContext.Table1
Dim predicate As Expression(Of System.Func(Of Table1, Boolean)) = Nothing
....
Dim predicateAdd As Expression(Of System.Func(Of Table1, Boolean)) = PredicateBuilder.True(Of Table1)()
predicateAdd = predicateAdd.And(Function(a As Table1) a.Table2.Table3.Select(Function(c) c.Column1).Contains(TextToSearch))
predicate = predicate.And(predicateAdd)
....
Me.Grid.DataSource = vQuery.Where(predicate)
產生以下查詢到數據庫
SELECT [t0].[ID], ...
FROM [dbo].[Table1] AS [t0]
WHERE EXISTS(
SELECT NULL AS [EMPTY]
FROM [dbo].[Table2] AS [t1], [dbo].[Table3] AS [t2]
WHERE ([t2].[Column1] = @p0) AND ([t1].[ID] = [t0].[ID]) AND ([t2].[ID] = [t1].[ID])
)
-- @p0 is TextToSearch
但這不是我想要的。
這行代碼
a.Table2.Table3.Select(Function(c) c.Column1).Contains(TextToSearch)
將不得不產生一個查詢到數據庫
WHERE ([t2].[Column1] Like @p0)
但不是這個
WHERE ([t2].[Column1] = @p0)
如果我錯了地方,或者是這是LinqToSql中的一個錯誤