Linq in条件查询
Linq 实现sql中的not in和in条件查询
T-SQL的IN:
Select ProductID, ProductName, CategoryIDFrom dbo.ProductsWhere CategoryID in (1, 2)
T-SQL的NOT IN:
Select ProductID, ProductName, CategoryIDFrom dbo.ProductsWhere CategoryID not in (1, 2)
Or
Select ProductID, ProductName, CategoryIDFrom dbo.ProductsWhere not CategoryID in (1, 2)
LINQ的IN:
var queryResult = from p in db.Productswhere (new int?[] {1,2}).Contains(p.CategoryID)select p;
LINQ的IN解析成SQL:
SELECT [t0].[ProductID], [t0].[ProductName], [t0].[SupplierID], [t0].[CategoryID], [t0].[QuantityPerUnit], [t0].[UnitPrice], [t0].[UnitsInStock], [t0].[UnitsOnOrder], [t0].[ReorderLevel], [t0].[Discontinued]FROM [dbo].[Products]AS [t0]WHERE [t0].[CategoryID] IN (@p0, @p1)
LINQ的NOT IN:
var queryResult = from p in db.Productswhere ! (new int?[] {1,2}).Contains(p.CategoryID)select p;
LINQ的NOT IN解析成SQL:
SELECT [t0].[ProductID], [t0].[ProductName], [t0].[SupplierID], [t0].[CategoryID], [t0].[QuantityPerUnit], [t0].[UnitPrice], [t0].[UnitsInStock], [t0].[UnitsOnOrder], [t0].[ReorderLevel], [t0].[Discontinued]FROM [dbo].[Products]AS [t0]WHERE NOT [t0].[CategoryID] IN (@p0, @p1)

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