在使用WordPress的過程中，我們少不瞭要對數據庫進行修改操作，比如，更換域名、修改附件目錄、批量修改文章內容等等。這個時候，使用SQL查詢語句可以大大簡化我們的工作量。
關於如何操作SQL查詢語句，請移步《phpMyAdmin教程 之 使用SQL查詢語句修改數據庫信息》
下面分享一些wordpress常用的SQL查詢語句
註：1.在每次使用SQL查詢語句前，請務必導出數據庫備份！！
2.下面的SQL查詢語句，數據庫都是使用WordPress默認的 wp_ 表頭，請根據自己的實際修改。
1. 刪除所有未使用的標簽
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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 |
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.刪除所有文章修訂版本(Revisions)以及它們的Meta數據
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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' |
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地址和首頁地址
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UPDATE wp_options SET option_value = replace(option_value, 'http://www.舊網址.com', 'http://www.新網址.com') WHERE option_name = 'home' OR option_name = 'siteurl' |
UPDATE wp_options
SET option_value = replace(option_value, ‘http://www.舊網址.com’, ‘http://www.新網址.com’)
WHERE option_name = ‘home’ OR option_name = ‘siteurl’
4. 更改文章的GUID
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UPDATE wp_posts SET guid = REPLACE (guid, 'http://www.舊網址.com', 'http://www.新網址.com') |
UPDATE wp_posts
SET guid = REPLACE (guid, ‘http://www.舊網址.com’, ‘http://www.新網址.com’)
5. 更改正文中的鏈接地址
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UPDATE wp_posts SET post_content = REPLACE (post_content, 'http://www.舊網址.com', 'http://www.新網址.com') |
UPDATE wp_posts
SET post_content = REPLACE (post_content, ‘http://www.舊網址.com’, ‘http://www.新網址.com’)
6. 更新文章的Meta值
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UPDATE wp_postmeta SET meta_value = REPLACE (meta_value, 'http://www.舊網址.com', 'http://www.新網址.com') |
UPDATE wp_postmeta
SET meta_value = REPLACE (meta_value, ‘http://www.舊網址.com’, ‘http://www.新網址.com’)
7. 重設Admin密碼
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UPDATE wp_users SET user_pass = MD5( 'new_password' ) WHERE user_login = 'admin' |
UPDATE wp_users
SET user_pass = MD5( ‘new_password’ )
WHERE user_login = ‘admin’
8. 重設admin的用戶名
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UPDATE wp_users SET user_login = 'newname' WHERE user_login = 'admin' |
UPDATE wp_users
SET user_login = ‘newname’
WHERE user_login = ‘admin’
9. 將作者a的文章全部轉移到作者b
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UPDATE wp_posts SET post_author = 'b' WHERE post_author = 'a' |
UPDATE wp_posts
SET post_author = ‘b’
WHERE post_author = ‘a’
10. 刪除文章的meta標簽
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DELETE FROM wp_postmeta WHERE meta_key = 'your-meta-key' |
DELETE FROM wp_postmeta
WHERE meta_key = ‘your-meta-key’
11. 導出所有評論中的郵件地址
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SELECT DISTINCT comment_author_email FROM wp_comments |
SELECT DISTINCT comment_author_email
FROM wp_comments
12. 刪除所有的Pingback
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DELETE FROM wp_comments WHERE comment_type = 'pingback' |
DELETE FROM wp_comments
WHERE comment_type = ‘pingback’
13. 刪除所有的垃圾評論
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DELETE FROM wp_comments WHERE comment_approved = 'spam' |
DELETE FROM wp_comments
WHERE comment_approved = ‘spam’
14. 禁用所有激活的插件
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UPDATE wp_options SET option_value = '' WHERE option_name = 'active_plugins' |
UPDATE wp_options
SET option_value = ”
WHERE option_name = ‘active_plugins’
15. 羅列所有未使用的Meta標簽
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SELECT * FROM wp_postmeta pm LEFT JOIN wp_posts wp ON wp.ID = pm.post_id WHERE wp.ID IS NULL |
SELECT *
FROM wp_postmeta pm
LEFT JOIN wp_posts wp ON wp.ID = pm.post_id
WHERE wp.ID IS NULL
16. 關閉舊文章的留言
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UPDATE wp_posts SET comment_status = 'closed' WHERE post_date < '2009-01-01' AND post_status = 'publish' |
UPDATE wp_posts
SET comment_status = ‘closed’
WHERE post_date < ‘2009-01-01’ AND post_status = ‘publish’
17. 更新留言者的網址
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UPDATE wp_comments SET comment_author_url = REPLACE( comment_author_url, 'http://舊網址.com', 'http://新網址.com' ) |
UPDATE wp_comments
SET comment_author_url = REPLACE( comment_author_url, ‘http://舊網址.com’, ‘http://新網址.com’ )
18. 更新正文內所有的’target=”_blank”‘為’rel=”nofollow”‘
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UPDATE wp_posts SET post_content = REPLACE (post_content, 'target="_blank', 'rel="nofollow') |
UPDATE wp_posts
SET post_content = REPLACE (post_content, ‘target="_blank’, ‘rel="nofollow’)
以上18條來自 http://paranimage.com/19-wordpress-sql-hacks/，以後將繼續補充。
19.刪除未使用的Meta標簽
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DELETE pm FROM wp_postmeta pm LEFT JOIN wp_posts wp ON wp.ID = pm.post_id WHERE wp.ID IS NULL |
DELETE pm
FROM wp_postmeta pm
LEFT JOIN wp_posts wp ON wp.ID = pm.post_id
WHERE wp.ID IS NULL
20.刪除重復的自定義字段（Custom Fields）
詳見：https://www.wpdaxue.com/remove-duplicate-custom-fields.html
21.更改文章自定義字段的名稱
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UPDATE `wp_postmeta` SET `meta_key` = '新名稱' WHERE `meta_key` = '舊名稱'; |
UPDATE `wp_postmeta` SET `meta_key` = ‘新名稱’ WHERE `meta_key` = ‘舊名稱’;