mysql - 表锁定错误

Question

此 SELECT 按预期返回结果。

SELECT 
    h.id,
    h.rec_inv_num,
    h.rec_inv,
    h.trans_date,
    h.trans_branch,
    h.trans_type,
    h.trans_number
FROM
    1_trans_history h
WHERE
    h.id IN (SELECT 
            h.id
        FROM
            1_trans_history_entries_stat s
                LEFT JOIN
            1_trans_history_entries e ON e.id = s.fk_trans_history_entries_id
                LEFT JOIN
            1_trans_history h ON h.id = e.fk_trans_history_id
                LEFT JOIN
            addresses a ON a.id = h.i_fk_addresses_id
        WHERE
            s.item_stat = 2
        GROUP BY h.id
        ORDER BY a.company , h.i_surname , h.i_middle_init , h.i_first_name , h.i_title);

我现在需要锁定表以进行写入，因此我添加了此内容，但收到“错误代码:1100 表 '1_trans_history' 未使用 LOCK TABLES 锁定”

LOCK TABLES 
1_trans_history h WRITE,
1_trans_history_entries e WRITE,
1_trans_history_entries_stat s WRITE;

我理解“您不能在单个查询中多次使用锁定的表。请改用别名，在这种情况下，您必须分别为每个别名获取锁定:”

所以我已将代码更改为此，但我收到相同的错误

LOCK TABLES 
1_trans_history h WRITE,
1_trans_history_entries e WRITE,
1_trans_history_entries_stat s WRITE,
1_trans_history h2 WRITE,
1_trans_history_entries e2 WRITE,
1_trans_history_entries_stat s2 WRITE,
addresses a2 WRITE;

SELECT 
    h.id,
    h.rec_inv_num,
    h.rec_inv,
    h.trans_date,
    h.trans_branch,
    h.trans_type,
    h.trans_number
FROM
    1_trans_history h
WHERE
    h.id IN (SELECT 
            h2.id
        FROM
            1_trans_history_entries_stat s2
                LEFT JOIN
            1_trans_history_entries e2 ON e2.id = s2.fk_trans_history_entries_id
                LEFT JOIN
            1_trans_history h2 ON h2.id = e2.fk_trans_history_id
                LEFT JOIN
            addresses a2 ON a2.id = h2.i_fk_addresses_id
        WHERE
            s2.item_stat = 2
        GROUP BY h2.id
        ORDER BY a2.company , h2.i_surname , h2.i_middle_init , h2.i_first_name , h2.i_title);

unlock tables;

Answer 1

我认为 LOCK 语句中的别名存在一些混淆。我已删除 1_trans_history 表的别名之一并将其显式添加到 LOCK 语句中。为了更加清晰起见，我还重命名了 a2 和 s2 别名。

LOCK TABLES
1_trans_history WRITE,
1_trans_history h WRITE,
1_trans_history_entries e WRITE,
1_trans_history_entries_stat s WRITE,
addresses a WRITE;

SELECT 
   id,
   rec_inv_num,
   rec_inv,
   trans_date,
   trans_branch,
   trans_type,
   trans_number
FROM
    1_trans_history
WHERE
    1_trans_history.id IN (SELECT 
        h.id
    FROM
        1_trans_history_entries_stat s
            LEFT JOIN
        1_trans_history_entries e ON e.id = s.fk_trans_history_entries_id
            LEFT JOIN
        1_trans_history h ON h.id = e.fk_trans_history_id
            LEFT JOIN
        addresses a ON a.id = h.i_fk_addresses_id
    WHERE
        s.item_stat = 2
    GROUP BY h.id
    ORDER BY a.company , h.i_surname , h.i_middle_init , h.i_first_name , h.i_title);
UNLOCK TABLES;

尝试一下，它应该对你有用。

说实话，我相信唯一需要别名的表是 1_trans_history，但是我知道使用指定的其他别名查询更具可读性。