WordPress 常用数据库SQL查询语句

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在使用WordPress的过程中,我们少不了要对数据库进行修改操作,比如,更换域名、修改附件目录、批量修改文章内容等等。这个时候,使用SQL查询语句可以大大简化我们的工作量。
下面分享一些wordpress常用的SQL查询语句

注:
1.在每次使用SQL查询语句前,请务必导出数据库备份!!
2.下面的SQL查询语句,数据库都是使用WordPress默认的 wp_ 表头,请根据自己的实际修改。

1.删除所有未使用的标签

DELETE a,b,c
FROM wp_terms AS a
LEFT JOIN wp_term_taxonomy AS c ON a.term_id = c.term_id
LEFT JOIN wp_term_relationships AS b ON b.term_taxonomy_id = c.term_taxonomy_id
WHERE c.taxonomy = 'post_tag' AND c.count = 0

2.删除所有文章修订版本(Revisions)以及它们的Meta数据

DELETE a,b,c
FROM wp_posts a
LEFT JOIN wp_term_relationships b ON (a.ID = b.object_id)
LEFT JOIN wp_postmeta c ON (a.ID = c.post_id)
WHERE a.post_type = 'revision'

3.更改WordPress地址和首页地址

UPDATE wp_options
SET option_value = replace(option_value, 'http://www.旧网址.com', 'http://www.新网址.com')
WHERE option_name = 'home' OR option_name = 'siteurl'

4.更改文章的GUID

UPDATE wp_posts
SET guid = REPLACE (guid, 'http://www.旧网址.com', 'http://www.新网址.com')

5.更改正文中的链接地址

UPDATE wp_posts
SET post_content = REPLACE (post_content, 'http://www.旧网址.com', 'http://www.新网址.com')

6.更新文章的Meta值

UPDATE wp_postmeta
SET meta_value = REPLACE (meta_value, 'http://www.旧网址.com', 'http://www.新网址.com')

7.重设Admin密码

UPDATE wp_users
SET user_pass = MD5( 'new_password' )
WHERE user_login = 'admin'

8.重设admin的用户名

UPDATE wp_users
SET user_login = 'newname'
WHERE user_login = 'admin'

9.将作者a的文章全部转移到作者b

UPDATE wp_posts
SET post_author = 'b'
WHERE post_author = 'a'

10.删除文章的meta标签

DELETE FROM wp_postmeta
WHERE meta_key = 'your-meta-key'

11.导出所有评论中的邮件地址

SELECT DISTINCT comment_author_email
FROM wp_comments

12.删除所有的Pingback

DELETE FROM wp_comments
WHERE comment_type = 'pingback'

13.删除所有的垃圾评论

DELETE FROM wp_comments
WHERE comment_approved = 'spam'

14.禁用所有激活的插件

UPDATE wp_options
SET option_value = ''
WHERE option_name = 'active_plugins'

15.罗列所有未使用的Meta标签

SELECT *
FROM wp_postmeta pm
LEFT JOIN wp_posts wp ON wp.ID = pm.post_id
WHERE  wp.ID IS NULL

6.1关闭旧文章的留言

UPDATE wp_posts
SET comment_status = 'closed'
WHERE post_date < '2009-01-01' AND post_status = 'publish'

17.更新留言者的网址

UPDATE wp_comments
SET comment_author_url = REPLACE( comment_author_url, 'http://旧网址.com', 'http://新网址.com' )

18.更新正文内所有的’target=”_blank”‘为’rel=”nofollow”‘

UPDATE wp_posts
SET post_content = REPLACE (post_content, 'target="_blank',  'rel="nofollow')

以上18条来自 http://paranimage.com/19-wordpress-sql-hacks/,以后将继续补充。

19.删除未使用的Meta标签

DELETE pm
FROM wp_postmeta pm
LEFT JOIN wp_posts wp ON wp.ID = pm.post_id
WHERE wp.ID IS NULL

20.删除重复的自定义字段(Custom Fields)

详见:https://www.wpdaxue.com/remove-duplicate-custom-fields.html

21.更改文章自定义字段的名称

UPDATE `wp_postmeta` SET `meta_key` = '新名称' WHERE `meta_key` = '旧名称';
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