如何从 SQL 查询中执行 SQL 查询

Question

我正在使用 SQL Server 2014。我有一个名为 "Withdraw" 的 SQL 查询，其中 return 的值为 0 或 -1，具体取决于成功与否它的操作。

我想做的是创建第二个查询，它将执行第一个查询并将 return 值放在一个变量中，这样我就可以在新查询的 IF 语句中使用它。

简单的方法是复制另一个查询的代码，这是可以做到的（不是那么长的查询），但我想知道是否有更优雅的方法来做到这一点通过执行查询而不是复制它。

谢谢大家！

提现查询：

PROC [dbo].[withdrawl]
    (@AccountNum AS INT,
     @Amount AS INT)
AS
BEGIN
    set nocount on

    declare @rc as integer

    begin transaction
    begin try 
        IF @Amount < 20000
        BEGIN
            IF @Amount < ((SELECT crntbalance FROM tblAccounts WHERE acctNum = @AccountNum) + (SELECT overdraftsz FROM tblAccounts WHERE acctNum = @AccountNum))
            BEGIN
                UPDATE tblAccounts
                SET crntbalance -= @Amount
                WHERE acctNum = @AccountNum

                INSERT INTO tblTransactions (actNum, trnTypCod, amount) 
                VALUES (@AccountNum, 1, @Amount)

                UPDATE tblAccounts
                SET crntbalance += -5
                WHERE acctNum = @AccountNum

                INSERT INTO tblTransactions (actNum, trnTypCod, amount) 
                VALUES (@AccountNum, 5, 5)

                SET @rc = 0
            END
            ELSE
            BEGIN
                PRINT 'You do not have sufficient funds in your account to make this withdrawl.'
                SET @rc = -1
            END
        END
        ELSE
        BEGIN
            IF @Amount < ((SELECT crntbalance FROM tblAccounts WHERE acctNum = @AccountNum) + (SELECT overdraftsz FROM tblAccounts WHERE acctNum = @AccountNum))
            BEGIN
                UPDATE tblAccounts
                SET crntbalance -= @Amount
                WHERE acctNum = @AccountNum

                INSERT INTO tblTransactions (actNum, trnTypCod, amount) 
                VALUES (@AccountNum, 1, @Amount)

                SET @rc = 0
            END
            ELSE
            BEGIN
                PRINT 'You do not have sufficient funds in your account to make this withdrawl.'
                SET @rc = -1
            END
        END

        commit transaction
    END TRY
    BEGIN CATCH
        rollback transaction
        SET @rc = -1
    END CATCH

    BEGIN
        SELECT
            crntbalance AS 'New Balance'
        FROM 
            tblAccounts 
        WHERE 
            acctNum = @AccountNum
    END

    return @rc
END

新查询：

CREATE PROCEDURE Transfer 
     (@TakeAccount AS INT, @GiveAccount as INT, @amount as INT)
AS
BEGIN
    declare @rc as integer
    BEGIN TRY
        set @rc = EXECUTE dbo.withdrawl
        IF @rc = -1
            BEGIN

            END
        ELSE
            BEGIN
            END
    END TRY
    BEGIN CATCH
    END CATCH
END

Answer 1

您可以将该查询转换为函数，而不是使用 PROC

CREATE FUNCTION [dbo].[Withdraw] 
(
    -- insert parameters here
)
RETURNS int
AS
BEGIN

    DECLARE @Result int

    -- insert processing here
    set @Result = -1


     return @Result
END

您可以在其他查询中使用的结果

SET @rc =  dbo.Withdraw()

Answer 2

这是使用存储过程的 return 值设置变量的正确语法（假设变量已经声明）：

EXEC @rc = [schema].[StoredProc]
  {Parameters, if any}

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