/**
  * @see Idb::excute()
  * @param string $sql
  * @return \PDOStatement
  * @throws DBException
  */
 public function excute($sql)
 {
     if ($this->link == null) {
         $this->connect();
     }
     if (DB_ESCAPE) {
         $sql = addslashes($sql);
     }
     try {
         $result = $this->link->query($sql);
     } catch (PDOException $e) {
         $exception = new DBException("SQL错误:" . $e->getMessage());
         $exception->setCode($e->getCode());
         $exception->setQuery($sql);
         if (APP_DEBUG) {
             __print($sql);
         }
         throw $exception;
     }
     Debug::appendMessage($sql, 'sql');
     //添加调试信息
     return $result;
 }
 /**
  * 执行一条SQL语句,不同类型的SQL语句发送到不同的服务器去执行。
  * 1. 读的SQL语句发送到读服务器
  * 2. 写入SQL语句发送到写服务器
  * 3. 此方法将抛出异常
  * @see \herosphp\db\interfaces\ICusterDB::query()
  * @throws DBException
  */
 public function query($_query)
 {
     if ($this->isReadSQL($_query)) {
         /* 读取数据操作 */
         $_db = $this->selectReadServer();
     } else {
         /* 写入数据操作 */
         $_db = $this->selectWriteServer();
     }
     try {
         $_result = $_db->query($_query);
     } catch (PDOException $e) {
         $_exception = new DBException("SQL错误!" . $e->getMessage());
         $_exception->setCode($e->getCode());
         $_exception->setQuery($_query);
         __print($_exception);
         die;
     }
     if (APP_DEBUG) {
         Debug::appendMessage($_query, 'sql');
         //添加调试信息
     }
     return $_result;
 }
 /**
  * @see \herosphp\db\interfaces\Idb::query()
  * @throws DBException
  */
 public function query($_query)
 {
     if ($this->link == null) {
         $this->connect();
     }
     try {
         $_result = $this->link->query($_query);
     } catch (PDOException $e) {
         $_exception = new DBException("SQL错误:" . $e->getMessage());
         $_exception->setCode($e->getCode());
         $_exception->setQuery($_query);
         if (APP_DEBUG) {
             __print($_exception);
             die;
         }
     }
     if (APP_DEBUG) {
         Debug::appendMessage($_query, 'sql');
         //添加调试信息
     }
     return $_result;
 }