function set_config($config)
 {
     parent::set_config($config);
     if ($this->config['common']['slave_except_table']) {
         $this->excepttables = explode(',', str_replace(' ', '', $this->config['common']['slave_except_table']));
     }
 }
 function set_config($config)
 {
     parent::set_config($config);
     if (!empty($this->config['slave'])) {
         $sid = array_rand($this->config['slave']);
         $this->slaveid = 1000 + $sid;
         $this->config[$this->slaveid] = $this->config['slave'][$sid];
         if ($this->config['common']['slave_except_table']) {
             $this->excepttables = explode(',', str_replace(' ', '', $this->config['common']['slave_except_table']));
         }
         unset($this->config['slave']);
     }
 }