Php sql查询的问题

我正在将一个旧的CodeIgniter应用程序迁移到WordPress。我已经将所有的数据作为自定义帖子产品导入，但问题是在旧站点上，它们重复使用页面段塞，当WP拉取帖子时会导致一些奇怪的问题，因为WordPress默认要求它是唯一的。所以，我想弄明白的是，我如何编写一个查询或脚本，从wp_帖子中查找所有重复的帖子名称，并为所有重复的帖子添加'-2'、'-3'、'-4'等。我的另一个选择是尝试修复WordPress，这样我就不需要独特的页面塞，但我甚至不知道我会转向哪里，尽管，如果可能的话，这将是最好的结果

如果我跑

从wp_posts中选择*，其中post_type='product'

它返回5973个结果。运行

从wp_帖子中选择不同的帖子标题，其中帖子类型='产品'

它返回1800行，因此手动执行此操作将花费大量时间

我试图用php编写一个脚本来输出每个查询，但我的sql语法中有一个错误，最终导致每组命令中的第一个应用于每个匹配结果，而不是第一个结果。有什么想法吗

global $wpdb;

$distinct_post_names = $wpdb->get_results( 'SELECT DISTINCT post_name FROM ' . $wpdb->prefix . 'posts WHERE post_type = "product" AND post_name != ""');

foreach( $distinct_post_names as $distinct_post ) {

    $these_posts = $wpdb->get_results( 'SELECT * FROM ' . $wpdb->prefix . 'posts WHERE post_name = "' . $distinct_post->post_name .'" AND post_type="product"');

    for ( $i = 0; $i < count($these_posts); $i++ ) {
        if ( $i != 0) {
            echo 'UPDATE ' . $wpdb->prefix . 'posts SET post_name = "' . $distinct_post->post_name . '-' . $i . '" WHERE post_name = "' . $distinct_post->post_name . '";<br>';
        }
    }

    echo '<br>';
}

---

你知道我的查询有什么问题吗？

我以前用Excel做过很多次。但如果有100万行，甚至只有10万行呢

在测试环境中执行此操作。不管发生什么事，都是你的责任。但我会这么做

我对WordPress一无所知，只知道我只是查了一下

所以我假设它有一个id，它是一个int自动增量，因此它必须是主键

模式 偷看数据 显示表示产品重复标题的标题 在联接中从上面生成一个派生表，以将输出限制为仅重复的标题。 -在上面添加一个行号列，每个标题分组从1开始递增

select w.*,
@rn:=if(w.post_title=@grp,@rn+1,1) as rownum,
@grp:=coalesce(null,w.post_title) as theGrp
from wp_posts w 
join 
(   SELECT post_title,count(*) as theCount 
    FROM wp_posts 
    WHERE post_type = 'product' 
    group by post_title 
    having theCount>1 
) xxx -- this is the alias, every derived table needs an alias 
on w.post_title=xxx.post_title
cross join (select @rn:=0,@grp='') params;


+----+------------+-----------+--------+--------+
| id | post_title | post_type | rownum | theGrp |
+----+------------+-----------+--------+--------+
|  4 | b          | product   |      1 | b      |
|  6 | b          | product   |      2 | b      |
|  7 | b          | product   |      3 | b      |
|  3 | d          | product   |      1 | d      |
|  8 | d          | product   |      2 | d      |
+----+------------+-----------+--------+--------+

这可能足以让您在关注输出的情况下做您想做的事情，并且对上面在其他sql生成器中使用的例程进行了调整，并使用了PK id

但是，让我们在一个update语句中完成这一切，然后用fast结束它

这需要抓取最后一段代码，并从中生成另一个派生表

以及使用连接模式的更新

update wp_posts
join
(   select w.*,
    @rn:=if(w.post_title=@grp,@rn+1,1) as rownum,
    @grp:=coalesce(null,w.post_title) as theGrp
    from wp_posts w 
    join 
    (   SELECT post_title,count(*) as theCount 
        FROM wp_posts 
        WHERE post_type = 'product' 
        group by post_title 
        having theCount>1 
    ) xxx -- this is the alias, every derived table needs an alias 
    on w.post_title=xxx.post_title
    cross join (select @rn:=0,@grp='') params
) xyz -- every derived table needs an alias 
on xyz.id=wp_posts.id
set wp_posts.post_title=concat(xyz.post_title,'-',cast(xyz.rownum as char(5)));
-- 5 rows(s) affected

后果 a的post_标题是留给您思考的一个边缘条件，因为它是为第二个服务的

这里有一个参考资料。看到的交叉连接只是在开始时初始化这些变量。不多不少。当输出经历一组新的标题时，它仅将行数设置回1。它可能看起来很神秘。好吧，看起来确实很神秘

---

祝你好运。哦，在测试环境中执行此操作。

因为帖子有重复的名称，并且您使用的逻辑生成一个查询，该查询将标题为“a”的所有帖子更新为“a-1”

您需要使用标题以外的字段来定位帖子。尝试获取帖子ID。因此，这将是：

global $wpdb;

$distinct_post_names = $wpdb->get_results( 'SELECT DISTINCT post_name FROM ' . $wpdb->prefix . 'posts WHERE post_type = "product" AND post_name != ""');

foreach( $distinct_post_names as $distinct_post ) {

    $these_posts = $wpdb->get_results( 'SELECT * FROM ' . $wpdb->prefix . 'posts WHERE post_name = "' . $distinct_post->post_name .'" AND post_type="product"');

    for ( $i = 0; $i < count($these_posts); $i++ ) {
        if ( $i != 0) {
            echo 'UPDATE ' . $wpdb->prefix . 'posts SET post_name = "' . $distinct_post->post_name . '-' . $i . '" WHERE ID = "' . $these_posts[$i]->ID . '";<br>';
        }
    }

    echo '<br>';
}

---

哇，多么彻底的帖子！我将通读这篇文章，如果我有任何问题，我会发表评论，但谢谢！

SELECT post_title,count(*) as theCount 
FROM wp_posts 
WHERE post_type = 'product' 
group by post_title 
having theCount>1;
+------------+----------+
| post_title | theCount |
+------------+----------+
| b          |        3 |
| d          |        2 |
+------------+----------+

select * 
from wp_posts w 
join 
(   SELECT post_title,count(*) as theCount 
    FROM wp_posts 
    WHERE post_type = 'product' 
    group by post_title 
    having theCount>1 
) xxx -- this is the alias, every derived table needs an alias 
on w.post_title=xxx.post_title;


+----+------------+-----------+------------+----------+
| id | post_title | post_type | post_title | theCount |
+----+------------+-----------+------------+----------+
|  4 | b          | product   | b          |        3 |
|  6 | b          | product   | b          |        3 |
|  7 | b          | product   | b          |        3 |
|  3 | d          | product   | d          |        2 |
|  8 | d          | product   | d          |        2 |
+----+------------+-----------+------------+----------+

select w.*,
@rn:=if(w.post_title=@grp,@rn+1,1) as rownum,
@grp:=coalesce(null,w.post_title) as theGrp
from wp_posts w 
join 
(   SELECT post_title,count(*) as theCount 
    FROM wp_posts 
    WHERE post_type = 'product' 
    group by post_title 
    having theCount>1 
) xxx -- this is the alias, every derived table needs an alias 
on w.post_title=xxx.post_title
cross join (select @rn:=0,@grp='') params;


+----+------------+-----------+--------+--------+
| id | post_title | post_type | rownum | theGrp |
+----+------------+-----------+--------+--------+
|  4 | b          | product   |      1 | b      |
|  6 | b          | product   |      2 | b      |
|  7 | b          | product   |      3 | b      |
|  3 | d          | product   |      1 | d      |
|  8 | d          | product   |      2 | d      |
+----+------------+-----------+--------+--------+

update wp_posts
join
(   select w.*,
    @rn:=if(w.post_title=@grp,@rn+1,1) as rownum,
    @grp:=coalesce(null,w.post_title) as theGrp
    from wp_posts w 
    join 
    (   SELECT post_title,count(*) as theCount 
        FROM wp_posts 
        WHERE post_type = 'product' 
        group by post_title 
        having theCount>1 
    ) xxx -- this is the alias, every derived table needs an alias 
    on w.post_title=xxx.post_title
    cross join (select @rn:=0,@grp='') params
) xyz -- every derived table needs an alias 
on xyz.id=wp_posts.id
set wp_posts.post_title=concat(xyz.post_title,'-',cast(xyz.rownum as char(5)));
-- 5 rows(s) affected

select * from wp_posts;
+----+------------+-----------+
| id | post_title | post_type |
+----+------------+-----------+
|  1 | a          | product   |
|  2 | a          | service   |
|  3 | d-1        | product   |
|  4 | b-1        | product   |
|  5 | c          | product   |
|  6 | b-2        | product   |
|  7 | b-3        | product   |
|  8 | d-2        | product   |
|  9 | z          | fancy     |
+----+------------+-----------+

global $wpdb;

$distinct_post_names = $wpdb->get_results( 'SELECT DISTINCT post_name FROM ' . $wpdb->prefix . 'posts WHERE post_type = "product" AND post_name != ""');

foreach( $distinct_post_names as $distinct_post ) {

    $these_posts = $wpdb->get_results( 'SELECT * FROM ' . $wpdb->prefix . 'posts WHERE post_name = "' . $distinct_post->post_name .'" AND post_type="product"');

    for ( $i = 0; $i < count($these_posts); $i++ ) {
        if ( $i != 0) {
            echo 'UPDATE ' . $wpdb->prefix . 'posts SET post_name = "' . $distinct_post->post_name . '-' . $i . '" WHERE ID = "' . $these_posts[$i]->ID . '";<br>';
        }
    }

    echo '<br>';
}