'db_user' => 'root',
'db_pass' => '',
);
//...还有很多
至于选择哪一台服务器，只需要根据uid做一个简单的匹配就可以了。
再谈到的就是主从数据库了。什么情况下使用主从数据库？比如某个名人博客，访问量相当的大，已经没有办法把他的数据再进行拆分了，这个时候就得考虑主从数据库服务器了，使用多台数据库来分流。这样要适用主从和分库，可能上面配置信息得稍微改动一下。
$configs['db_info']['blog'][0]['master'] = array(
'db_host' => '192.168.0.1',
'db_name' => 'blog',
'db_user' => 'root',
'db_pass' => '',
);
$configs['db_info']['blog'][0]['slave'][0] = array(
'db_host' => '192.168.0.2',
'db_name' => 'blog',
'db_user' => 'root',
'db_pass' => '',
);
$configs['db_info']['blog'][0]['slave'][1] = array(
'db_host' => '192.168.0.3',
'db_name' => 'blog',
'db_user' => 'root',
'db_pass' => '',
);
$configs['db_info']['blog'][1]['master'] = array(
'db_host' => '192.168.0.4',
'db_name' => 'blog',
'db_user' => 'root',
'db_pass' => '',
);
$configs['db_info']['blog'][1]['slave'][0] = array(
'db_host' => '192.168.0.5',
'db_name' => 'blog',
'db_user' => 'root',
'db_pass' => '',
);
$configs['db_info']['blog'][1]['slave'][1] = array(
'db_host' => '192.168.0.6',
'db_name' => 'blog',
'db_user' => 'root',
'db_pass' => '',
);
$configs['db_info']['session'][0]['master'] = array(
'db_host' => '192.168.0.7',
'db_name' => 'session',
'db_user' => 'root',
'db_pass' => '',
);
$configs['db_info']['session'][1]['master'] = array(
'db_host' => '192.168.0.8',
'db_name' => 'session',
