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Finding your way in the WordPress database is pretty easy. It consists of 10 tables, which in turn are full of content. Just browsing the database should answer most of your questions, and any edits can be made right then and there if you know what you re after. Naturally, there is a full database description in the documentation (codex.wordpress.org/Database_Description) and you should consult that whenever you need to find something. The 10 main tables are:
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wp_comments: contains all comments wp_links: contains added links and links data wp_options: the blog options wp_postmeta: metadata for the posts wp_posts: the actual posts wp_terms: categories and tags wp_term_relationships: associates categories and tags with posts wp_term_taxonomy: descriptions for categories and tags wp_usermeta: user metadata wp_users: the actual users
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1: Anatomy of a WordPress Install
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All these tables are important, of course, but if you need to fix or change something directly in the database, chances are that it is in wp_options (for blog settings, like URLs and such), wp_posts (for mass editing of your blog posts), or wp_users (for password resets and such).
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One of the more common issues with WordPress upgrades is the widgets going crazy, sometimes outputting only a blank page on your blog. While this seems to be a lot less common these days, the upgrade instructions still state that you should disable all plugins and revert to the default theme. If you do, most likely you ll never get that blank page. However, should you get a blank page, it is probably a widget issue. A possible solution is to clean out the widgets in the database; they are hiding in the wp_options table. Exactly what you need to do and what the various widgets are called depends on what plugins you have, so tread carefully. Most likely the data is named in a way that seems logical compared to the plugins you use, and with that in mind you should be able to find what you re looking for. It may sound a bit hazardous, but it is worth giving it a go should you encounter a blank screen on your blog after an upgrade. Another issue you may want to resolve in the database is changing or resetting a password for a user. You can t actually retrieve the password from the database because it is encrypted and all you ll see is gibberish, but you can change it to something else. Just remember that the passwords needs the MD5 treatment, which can be done through PhpMyAdmin or just about any MySQL managing tool you may use. Basically, what you do is type the new password in plain text, and choose MD5 for that particular field. You ll end up with a new line of gibberish, which actually says what you typed in the first place. Again, if this sounds scary to you, don t do it without exploring other solutions first! Finally, you may want to mass edit your posts. Maybe you ve got a new domain and want to change the source for all images you ve used over the years, from olddomain.com/wp-content/ image.jpg to newdomain.com/wp-content/image.jpg, for example. There are plugins that will help you with this, so most of us should probably check them out first. If you re comfortable with the database, though, you can run a SQL query to search for all these elements and replace them with the new ones. It could be some thing like this:
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UPDATE wp_posts SET post_content = REPLACE ( post_content, 'olddomain.com/wp-content/', 'newdomain.com/wp-content/');
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That would search the wp_posts table for any mention of olddomain.com/wp-content/ and replace it with newdomain.com/wp-content/. That in turn would fix all the image links in the example above. Nifty little SQL queries for batch editing can come in handy, but remember: there are no undos here and what s done is done, so make sure you ve got backups before even considering doing these things.
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