sql-server - SQL Server - varchar 值的转换溢出了 int 列

Question

我需要生成具有指定长度的随机数字的字符串，所以我这样做:

ALTER PROCEDURE [dbo].[Generate Account]
AS
BEGIN
    DECLARE @accountNumber VARCHAR(36)
    DECLARE @acc_1 BIGINT
    DECLARE @acc_2 BIGINT
    DECLARE @acc_3 BIGINT
    DECLARE @acc_4 BIGINT -- line 26
    DECLARE @acc_5 BIGINT
    DECLARE @acc_6 BIGINT

    SET @acc_1 = 1000000-ceiling(rand()*100000) + datepart(ms, getdate())
    SET @acc_2 = 1000000-ceiling(rand()*100000) + datepart(ms, getdate())
    SET @acc_3 = 1000000-ceiling(rand()*100000) + datepart(ms, getdate())
    SET @acc_4 = 1000000-ceiling(rand()*100000) + datepart(ms, getdate()) -- line 33
    SET @acc_5 = 1000000-ceiling(rand()*100000) + datepart(ms, getdate())
    SET @acc_6 = 1000000-ceiling(rand()*100000) + datepart(ms, getdate())

    SET @accountNumber = CONVERT(VARCHAR(6), @acc_1) + 
                            CONVERT(VARCHAR(6), @acc_2) + 
                            CONVERT(VARCHAR(6), @acc_3) + 
                            CONVERT(VARCHAR(6), @acc_4) + 
                            CONVERT(VARCHAR(6), @acc_5) + 
                            CONVERT(VARCHAR(6), @acc_6)

    INSERT INTO [dbo].[account] 
    (
        [identifier]
    ) VALUES (
        @accountNumber
    )

    RETURN @accountNumber
END

但我收到错误:

Msg 8152, Level 16, State 14, Procedure Generate Account, Line 26 [Batch Start Line 2]
String or binary data would be truncated.
The statement has been terminated.

Msg 248, Level 16, State 1, Procedure Generate Account, Line 33 [Batch Start Line 2]
The conversion of the varchar value '976547932115913127987338933646998655' overflowed an int column.
The 'Generate Account' procedure attempted to return a status of NULL, which is not allowed. A status of 0 will be returned instead.

为什么？我已经将 @acc_X 从 INT 更改为 BIGINT，但我仍然收到此错误...

Answer 1

这里的问题是你的:

RETURN @accountNumber

在 SQL Server 中，当您尝试返回 36 位 varchar 时，存储过程只能返回 int，并且 SQL Server 会隐式尝试将其转换为一个int。

如果您需要插入的值，请将该行替换为简单的 select 语句:

SELECT @accountNumber AS AccountNumber

或

SELECT SCOPE_IDENTITY()

它应该可以工作。

如果您需要其他选项来从存储过程返回/输出值，请查看:

return data from a stored procedure