Question

我有以下查询循环数据块并将其复制到另一个表。我使用label的目标之一是在满足某些条件后有一个退出循环的机制：

SET @nth = 0;
SET @size = 1000 * 1;
SET @offset = @nth * @size;
SET @count = 7120;

lable1: LOOP
    PREPARE select_stmt FROM 
    "INSERT INTO foo.`track_new` (
        `...`
    )
    SELECT 
        `...`
    FROM foo.`track`  a
    WHERE ...
    ORDER BY ...
    LIMIT ?, ?";

    EXECUTE select_stmt USING @offset, @size; 

    IF @offset + @size > @count THEN LEAVE lable1;
    END IF;

    ...

END LOOP;

但是我收到了这些错误（删除了成功查询的消息）：

Query: lable1: LOOP PREPARE select_stmt FROM "INSERT INTO gps.`track_new` (         `id`,       `unit_id`,      `gps_time`,         `added_when`,       `latit...

Error Code: 1064
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'lable1: LOOP
    PREPARE select_stmt FROM 
    "INSERT INTO gps.`track_new` (
        `id`,
' at line 1

Execution Time : 0 sec
Transfer Time  : 0 sec
Total Time     : 0 sec
--------------------------------------------------
...

Query: IF @offset + @size > @count THEN leave lable1

Error Code: 1064
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'IF @offset + @size > @count THEN leave lable1' at line 1

Execution Time : 0 sec
Transfer Time  : 0 sec
Total Time     : 0 sec
--------------------------------------------------

我已经检查过标签的语法，看起来很好。我还检查了mysql中循环和其他控件结构的语法，但我无法弄清楚是什么问题。

修改

我注意到行EXECUTE select_stmt USING @offset, @size;被执行但后来循环不再重复。

MySQL中标记循环中的语法错误

0 个答案: