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(); // 自动检查并修复表的状态
    $this->_init_extend();
    parent::__construct();
}

// 新增的自动修复方法
public function repair() {
    $query1 = DB::query('CHECK TABLE '.DB::table($this->_table));
    $checkresult = mysql_fetch_array($query1, MYSQL_ASSOC);
    if($checkresult['Msg_text'] != 'OK') {
        DB::query('REPAIR TABLE '.DB::table($this->_table));
    }
}