解决discuz表崩溃 is marked as crashed之类问题

public function __construct($para = array()) {                if(!empty($para)) {                        $this->_table = $para['table'];                        $this->_pk = $para['pk'];                }                if(isset($this->_pre_cache_key) && (($ttl = getglobal('setting/memory/'.$this->_table)) !== null || ($ttl = $this->_cache_ttl) !== null) && memory('check')) {                        $this->_cache_ttl = $ttl;                        $this->_allowmem = true;                }        $this->repair();//解决表是否崩溃，新加进去的代码                $this->_init_extend();                parent::__construct();        }    //解决表是否崩溃，新加进去的一个自己检查是否需要修复的代码        public function repair() {      $query1=DB::query('CHECK TABLE '.DB::table($this->_table));          $checkresult =mysql_fetch_array($query1, MYSQL_ASSOC);      //echo(DB::table($this->_table));          //exit;                                          if($checkresult['Msg_text'] != 'OK') {          DB::query('REPAIR TABLE '.DB::table($this->_table));                 }                        }