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  • 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, CategoryID
    From dbo.Products
    Where CategoryID in (1, 2)

      

    T-SQL的NOT IN:

    Select ProductID, ProductName, CategoryID
    From dbo.Products
    Where CategoryID not in (1, 2)

      

    Or

    Select ProductID, ProductName, CategoryID
    From dbo.Products
    Where not CategoryID in (1, 2)

      

    LINQ的IN:

    var queryResult = from in db.Products
    where (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 in db.Products
    where ! (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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  • 原文地址:https://www.cnblogs.com/Godlovezk/p/8794167.html
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