I'm beginning to write wordpress plugins, and I've found a situation where I need to create tables to continue. Can someone point to a decent tutorial on modifying Wordpress's database?
Their usually excellent documentation seems lacking on this topic.
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For example, the "WP acronyms" plugin.
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A table with 2 columns (acronym and definition) would be natural.
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But this plugin stores the acronyms in a single row of the "wp_options" table.
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When data is necessary, the content of this row is parsed and the fields are extracted (using a delimiter).
Is there a Wordpress plugin which let the user register/login and see some new elements if he/she logs in?
You could consider using the same method..
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First though, I'd advise you to look and see if it can logically be done without creating a new table.
Custom Post Types can handle most of the heavy lifting for most content-related functions.
The bottom of the Custom Post Types Codex entry has several good tutorials for getting started..