[wp-trac] [WordPress Trac] #34189: Add warning about changing $table_prefix for existing database

[WordPress Trac]

#34189: Add warning about changing $table_prefix for existing database
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 Reporter:  bjerke-johannessen  |      Owner:
     Type:  enhancement         |     Status:  new
 Priority:  normal              |  Milestone:  Awaiting Review
Component:  Database            |    Version:  trunk
 Severity:  normal              |   Keywords:
  Focuses:                      |
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 When changing the $table_prefix for an existing database, it is not
 sufficient to rename the tables. You also have to change several values in
 at least two tables. In my case, changing prefix from "wp_" to "bbj_wp_"
 this involved at least the following SQL:

 UPDATE bbj_wp_options
 SET option_name = 'bbj_wp_user_roles'
 WHERE option_name = 'wp_user_roles';

 UPDATE bbj_wp_usermeta
 SET meta_key = 'bbj_wp_user_level'
 WHERE meta_key = 'wp_user_level';

 UPDATE bbj_wp_usermeta
 SET meta_key = 'bbj_wp_capabilities'
 WHERE meta_key = 'wp_capabilities';

 The attached patch adds a warning to the generated wp-config.php file
 about this. There is much room for improvement here, including giving
 detailed information on what needs to be changed or even re-writingthe
 particular misfeature that stores tables names in other tables. The patch
 is intended as a stop-gap 'til such improvements are made. Hopefully this
 will prevent others from chasing down the same wildly unexpected behavior
 should they decide to change $table_prefix

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Ticket URL: <https://core.trac.wordpress.org/ticket/34189>
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