Question

我有一个运行良好的存储过程;

ALTER PROCEDURE [dbo].[currentCoForHiLo] 
    @CoKeyCode Char(50)
BEGIN
    SET NOCOUNT ON;

    CREATE TABLE ##WrkedOnCo(cKeyCode Char(50), DateInt Int, HighValu Int, LowValu Int)

    CREATE CLUSTERED INDEX IDX_CI ON ##WrkedOnCo(DateInt)

    INSERT INTO ##WrkedOnCo 
        SELECT KeyCode, DateAsInt, HighValu, LowValu 
        FROM EODValuesAU 
        WHERE KeyCode = @CoKeyCode;
END

该程序从一个表EODValuesAU获取数据。

我现在有多个表EODValuesAU，EODValuesUS，EODValuesUK。

我尝试将代码更改为以下内容，但查询现在有错误。我想在查询中为表使用变量。有什么方法可以做到这一点。请参阅下面的更改代码;

ALTER PROCEDURE [dbo].[currentCoForHiLo] 
    @CoKeyCode Char(50), @CounrtyCode Char(10)
AS
BEGIN
    SET NOCOUNT ON;

    CREATE TABLE ##WrkedOnCo(cKeyCode Char(50), DateInt Int, HighValu Int, LowValu Int)

    CREATE CLUSTERED INDEX IDX_CI ON ##WrkedOnCo(DateInt)

    INSERT INTO ##WrkedOnCo 
        SELECT KeyCode, DateAsInt, HighValu, LowValu 
        FROM 'EODValues' + @CountryCode 
        WHERE KeyCode = @CoKeyCode;
END

Answer 1

动态SQL是你的朋友。

而不是INSERT，尝试这样的事情：

DECLARE @sql VARCHAR(400);
SET @sql = 'INSERT INTO ##WrkedOnCo SELECT KeyCode, DateAsInt, HighValu, LowValu FROM EODValues'+@CountryCode+' WHERE KeyCode = @CoKeyCode;';
PRINT @sql;  --check its what you want first
--EXEC (@sql);

Damien_The_Unbeliever的评论将是最好的，动态SQL很快就会变得混乱

Answer 2

-- you Have to Use Dynamic Query to desire Output


ALTER PROCEDURE [dbo].[currentCoForHiLo] 
    @CoKeyCode NVARCHAR(50),@CounrtyCode NVARCHAR (10)
AS
BEGIN
    SET NOCOUNT ON;

    CREATE TABLE ##WrkedOnCo(cKeyCode NVARCHAR(50), DateInt Int, HighValu Int, LowValu Int)

    CREATE CLUSTERED INDEX IDX_CI ON ##WrkedOnCo(DateInt)

    DECLARE @sql VARCHAR(4000)
    SET @sql = 'INSERT INTO ##WrkedOnCo 
                SELECT KeyCode, DateAsInt, HighValu, LowValu FROM EODValues'+@CounrtyCode+' WHERE KeyCode = '''+@CoKeyCode+'''';
    PRINT @sql;  
    EXEC (@sql);
END

T-SQL存储过程，在查询

2 个答案: