使用 LEFT JOIN pdo php mysql 更新答案

【问题标题】：Update with LEFT JOIN pdo php mysql使用 LEFT JOIN pdo php mysql 更新
【发布时间】：2015-11-27 11:42:35
【问题描述】：

我想同时更新多个表，所以我使用 LEFT JOIN 为我的 UPDATE 创建一个查询。我尝试了 2 种方法来进行 LEFT JOIN，但都失败了。我看不出我在哪里犯了错误，所以我希望有人能够正确剖析查询并指出错误。

我已经对查询应用了一些格式，以便我看起来比以前更易读：

首先是：

"UPDATE "
.
"table1 AS t1 SET t1.Bid = :id "
.
"LEFT JOIN table2 AS t2 SET t2.id = :id ON t1.Bid = t2.id AND t1.status = t2.status "
.
"LEFT JOIN table3 AS t3 SET t3.Bid = :id ON t1.Bid = t3.Bid AND t1.status = t3.status "
.
"LEFT JOIN table4 AS t4 SET t4.id = :id ON t1.Bid = t4.id AND t1.status = t4.status "
.
"LEFT JOIN table5 AS t5 SET t5.Bid = :id ON t1.Bid = t5.Bid AND t1.status = t5.status "
.
"LEFT JOIN table6 AS t6 SET t6.id = :id ON t1.Bid = t6.id AND t1.status = t6.status "
.
"LEFT JOIN table7 AS t7 SET t7.Bid = :id ON t1.Bid = t7.Bid AND t1.status = t7.status "
.
"LEFT JOIN table8 AS t8 SET t8.id = :id ON t1.Bid = t8.id AND t1.status = t8.status "

.
"WHERE t1.Bid = :oldid AND t1.status = :status "

第二个是：

$stmt = $dbh - > prepare("UPDATE "
    .
    "table1 AS t1 "
    .
    "LEFT JOIN table2 AS t2 ON t1.Bid = t2.id AND t1.status = t2.status "
    .
    "LEFT JOIN table3 AS t3 ON t1.Bid = t3.Bid AND t1.status = t3.status "
    .
    "LEFT JOIN table4 AS t4 ON t1.Bid = t4.id AND t1.status = t4.status "
    .
    "LEFT JOIN table5 AS t5 ON t1.Bid = t5.Bid AND t1.status = t5.status "
    .
    "LEFT JOIN table6 AS t6 ON t1.Bid = t6.id AND t1.status = t6.status "
    .
    "LEFT JOIN table7 AS t7 ON t1.Bid = t7.Bid AND t1.status = t7.status "
    .
    "LEFT JOIN table8 AS t8 ON t1.Bid = t8.id AND t1.status = t8.status "
    .
    " SET t1.Bid = :id, "
    .
    " SET t2.id = :id, "
    .
    " SET t3.Bid = :id, "
    .
    " SET t4.id = :id, "
    .
    " SET t5.Bid = :id, "
    .
    " SET t6.id = :id, "
    .
    " SET t7.Bid = :id, "
    .
    " SET t8.id = :id "

    .
    "WHERE t1.Bid = :oldid AND t1.status = :status ");

更新

我使用第一个选项，我得到：

致命错误：未捕获的异常 'PDOException' 带有消息 'SQLSTATE[42000]：语法错误或访问冲突：1064 您的 SQL 语法有错误；查看与您的 MySQL 服务器版本相对应的手册，了解在第 1 行的 'LEFT JOIN table2 AS t2 SET t2.id = '315-512-613-12' 附近使用的正确语法

第二个得到：

致命错误：未捕获的异常 'PDOException' 带有消息 'SQLSTATE[42000]：语法错误或访问冲突：1064 您的 SQL 语法有错误；检查与您的 MySQL 服务器版本相对应的手册，以在 'SET t2.id = '315-512-613-123V', SET t3.Bid = '315-512-613-123V', SE' 附近使用正确的语法在第 1 行'

【问题讨论】：

那么问题出在哪里？请包括两个请求的预期和实际结果。我相信 update 多个表的 Mysql 语法是 UPDATE t1, t2, t3 SET t1.field1=value1, t2.field2=value2 ... WHERE t1.pk=t2.fk ...
在执行查询时检查 MySQL 返回的错误。
@AlexBlex 我希望它会更新，但我收到错误。我会检查错误并将其粘贴到更新中。我不需要使用左连接是你的意思吗？但如果表中不存在特定 ID，这意味着它不会被更新。这就是我使用 LEFT JOIN 的原因之一

标签： php mysql pdo left-join

【解决方案1】：

I had it working using this query.

"UPDATE 
    table1 AS t1 LEFT JOIN
    table2 AS t2 ON t1.Bid = t2.id AND t1.status = t2.status LEFT JOIN
    table3 AS t3 ON t1.Bid = t3.Bid AND t1.status = t3.status LEFT JOIN
    table4 AS t4 ON t1.Bid = t4.id AND t1.status = t4.status LEFT JOIN
    table5 AS t5 ON t1.Bid = t5.Bid AND t1.status = t5.status LEFT JOIN
    table6 AS t6 ON t1.Bid = t6.id AND t1.status = t6.status LEFT JOIN
    table7 AS t7 ON t1.Bid = t7.Bid AND t1.status = t7.status LEFT JOIN
    table7 AS t8 ON t1.Bid = t8.id AND t1.status = t8.status
    SET t1.Bid = :id,
        t2.id = :id,
        t3.Bid = :id,
        t4.id = :id,
        t5.Bid = :id,
        t6.id = :id,
        t7.Bid = :id,
        t8.id = :id
    WHERE t1.Bid = :oldid
    AND t1.status = :status "

【讨论】：