wordpress多站点使用一个数据库

/** 
* WordPress Database Table prefix. 
* 
* You can have multiple installations in one database if you give each a unique 
* prefix. Only numbers, letters, and underscores please! 
*/ 
$table_prefix = 'wp_';

/** 
* WordPress Database Table prefix. 
* 
* You can have multiple installations in one database if you give each a unique 
* prefix. Only numbers, letters, and underscores please! 
*/ 
$table_prefix = 'blog_';

UPDATE blog_usermeta SET meta_key ='blog_capabilities' WHERE meta_key ='wp_capabilities'; 
UPDATE blog_usermeta SET meta_key ='blog_user_level' WHERE meta_key ='wp_user_level'; 
UPDATE blog_options SET option_name='blog_user_roles' WHERE option_name='wp_user_roles';