引用表值参数时必须声明标量变量

Question

这个问题来自this one。

以下 SQL 有效：

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

ALTER PROCEDURE [dbo].[Update_Repair_Details]
    @RepairID BIGINT,
    @NewDetails NewDetails READONLY
AS
BEGIN
    SET NOCOUNT ON;

    DELETE FROM Repair_Details
    WHERE RepairID = @RepairID

    INSERT INTO Repair_Details
        SELECT *, GETDATE()
        FROM @NewDetails
END

但是由于RepairID是用户自定义表类型中的第一列，所以没有理由将其作为附加参数传递。

我是这样写的：

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

ALTER PROCEDURE [dbo].[Update_Repair_Details]
    @NewDetails NewDetails READONLY
AS
BEGIN
    SET NOCOUNT ON;

    DELETE FROM Repair_Details
    WHERE RepairID = @NewDetails.RepairID

    INSERT INTO Repair_Details
        SELECT *, GETDATE()
        FROM @NewDetails
END    

导致错误：

必须声明标量变量“@NewDetails”

为什么这个有错误，而以前的版本没有？

Answer 1

在这种情况下，@NewDetails 是一个表；因此，你不能只做WHERE RepairID = @NewDetails.RepairID。您可以使用IN、EXISTS 或JOIN：

ALTER PROCEDURE [dbo].[Update_Repair_Details]
@NewDetails NewDetails READONLY
AS
BEGIN
    SET NOCOUNT ON;
    DELETE A
    FROM Repair_Details A
    INNER JOIN @NewDetails B
        ON A.RepairID = B.RepairID;

INSERT INTO Repair_Details
SELECT *, GETDATE()
FROM @NewDetails;
END