配置文件中配置了额外的数据库连接信息
'DB_CONFIG1' => array(
'db_type' => 'mysql',
'db_user' => 'root',
'db_pwd' => '1234',
'db_host' => 'localhost',
'db_port' => '3306',
'db_name' => 'thinkphp'
'db_prefix' => 'thinkphp_',(这个配置不好使，手册上没有这项就不好使？我认为应该好使啊！！！！)
),