Question

给出以下SQL用户定义的表类型：

CREATE TYPE IntegerIdTableType AS TABLE
(
    Id INT IDENTITY NOT NULL,
    PRIMARY KEY(Id)
);

在存储过程中将类型用作参数时，如何使用Id字段？

CREATE PROCEDURE FindPencilsForPencilCases
    @pencilCaseIds dbo.IntegerIdTableType READONLY
AS
BEGIN
    SELECT *
    FROM Pencils
    INNER JOIN @pencilCaseIds ON @pencilCaseIds.Id = Pencils.PencilCaseId
END

如果我只运行SELECT * FROM @pencilCaseIds，我可以使以上代码运行，但是如果我引用Id字段，则会得到以下异常：

Must declare the scalar variable "@pencilCaseIds".

Answer 1

您需要为表值参数添加别名：

CREATE PROCEDURE FindPencilsForPencilCases
    @pencilCaseIds dbo.IntegerIdTableType READONLY
AS
BEGIN
    SELECT *
    FROM Pencils
    INNER JOIN @pencilCaseIds AS tvp 
        ON tvp.Id = Pencils.PencilCaseId
END

如何使用表类型上的字段？

1 个答案: