SQL Server while 循环和动态 SQL答案

【问题标题】：SQL Server while loop and dynamic SQLSQL Server while 循环和动态 SQL
【发布时间】：2018-02-12 08:51:36
【问题描述】：

我正在尝试从 SQL Server while 循环执行动态 SQL。当执行唯一的打印语句时，查询以正确的格式打印，但不使用execute() 或SP_EXECUTESQL 执行动态SQL。请建议。代码：

WHILE( @count > 0 )
BEGIN 
    SELECT 
        @minID = MinID,
        @maxID = MaxID
    FROM
        IDRange
    WHERE
        ID = @count

    SET @QueryString = ' UPDATE 
                        SD  WITH(TABLOCk)
                            SET a = S4H.ID
                        FROM 
                            A (nolock) S4H
                            INNER JOIN B SD on S4H.col = SD.col AND S4H.col1 = SD.col1
                        WHERE 
                            SD.ID between ' + convert (varchar,@minID )+' AND '+convert (varchar,@maxID )+' AND
                            S4H.ID <= SD.ID AND 
                            SD.ID <= S4h.ROWID' 
                            SET @count= @count - 1' 
    print @QueryString
    EXECUTE (@QueryString)
    EXECUTE sp_executesql @QueryString, N'@minID INT,@maxID INT', @minID = @minID,@maxID= @maxID
    --EXEC SP_EXECUTESQL @QueryString
    --SELECT @Rcount= @@Rowcount

    SET @count= @count - 1
END

结束

【问题讨论】：

标签： sql sql-server dynamic while-loop

【解决方案1】：

SET @count= @count 末尾有一个开放的'，删除它。

使用EXEC (@QueryString) 执行它，所以它看起来像这样：

WHILE(@count > 0)
    BEGIN
        SELECT
            @minID = MinID,
            @maxID = MaxID
        FROM IDRange
        WHERE ID = @count;
        SET @QueryString = ' UPDATE 
                        SD  WITH(TABLOCk)
                            SET a = S4H.ID
                        FROM 
                            A (nolock) S4H
                            INNER JOIN B SD on S4H.col = SD.col AND S4H.col1 = SD.col1
                        WHERE 
                            SD.ID between '+CONVERT(VARCHAR, @minID)+' AND '+CONVERT(VARCHAR, @maxID)+' AND
                            S4H.ID <= SD.ID AND 
                            SD.ID <= S4h.ROWID';
        PRINT @QueryString;
        EXEC (@QueryString);

        SET @count = @count - 1;
    END;

【讨论】：

【解决方案2】：

-- 动态查询关闭不正确 SET @count= @count - 1' 重复两次不正确

WHILE( @count > 0 )
BEGIN 

    SELECT @minID = MinID, @maxID = MaxID
    FROM  IDRange
    WHERE ID = @count

    SET @QueryString = ' UPDATE 
                        SD  WITH(TABLOCk)
                            SET a = S4H.ID
                        FROM 
                            A (nolock) S4H
                            INNER JOIN B SD on S4H.col = SD.col AND S4H.col1 = SD.col1
                        WHERE 
                            SD.ID BETWEEN ' + convert (varchar,@minID )+' AND '+convert (varchar,@maxID )+' AND
                            S4H.ID <= SD.ID AND 
                            SD.ID <= S4h.ROWID' 

    PRINT    @QueryString
    EXECUTE (@QueryString)
    SET @count= @count - 1
END

【讨论】：