function convert2utf8($string)
  {
    return iconv("gbk","utf-8",$string);
  }
  function convert2gbk($string)
  {
    return iconv("utf-8","gbk",$string);
  }

?php
class dao_dao extends Zend_Db_Table {

  public function returnDb(){
    return $db = $this->getAdapter();
  }

  public function getData($table,$where = false, $order = 'id ASC', $pagesize = false, $offset = false, $count = false, $from = false, $join = false, $group = false) {
    $db = $this->getAdapter();
    $select = $db->select();
    
    if ($where  is_array($where)) {
      foreach ($where as $key => $val) {
        //print_r($where);
        if($val['type']==1){
          $select->where($key, $val['val']);
        }else{
          $select->orwhere($key, $val['val']);
        }
        
      } 
    }

    if (!$from)
      $from = '*';
    //echo $select."br/>";
    if ($pagesize) {
      $select->limit($pagesize, $offset);
    }
    //echo $select."br/>";
    if (is_array($order)) {
      foreach ($order as $value) {
        $select->order($value);
      }
    } else {
      $select->order($order);
    }
    //echo $select."br/>";
    $select->from($table, $count ? "COUNT(".$table.".id)" : $from);
    
    if (is_array($group)) {
      foreach ($group as $key => $val) {
        $select->group($val);
      }

      if ($count) {
        $result = $db->fetchAll($select);
        //echo $select."br/>";
        return $result;
      }
    } else {
      if ($count) {
        $result = $db->fetchOne($select);
        //echo $select."br/>";
        return $result;
      }
    }
    if (is_array($join)) {
      foreach ($join as $key => $val) {
        $select->join($key, $val[0], $val[1]);
      }
    }

    //echo $select."br/>";

    //echo $select;exit;
    
    $result = $db->fetchAll($select);
    foreach ($result as $key => $value) {
      foreach ($value as $key2 => $value2) {
        $result[$key][$key2] = $this->convert2utf8($value2);
      }
    }
    return $result;
  }
  
  


  /**
   * 向表中插入数据
   * array $adata 数据
   * string $table 表名
   * int $insterid 是否需要返回插入ID
   * @return true or false or int
   */
   // @bianding 2013.11.04 更改了pdo中mssql.php的lastInsertId()函数
   // @bianding 2013.11.04 经测试 mssql.php中的lastInsertId()函数中的SELECT两种方式都行
  function SaveData($adata, $table, $insterid = 0, $aLog = false) {
    $db =  $this->getAdapter();
    foreach ($adata as $key => $value) {
      $adata[$key] = $this->convert2gbk($value);
    }
    if ($db->insert($table, $adata)) {
      //var_dump($db->getProfiler());
      $insertedID = $db->lastInsertId();      
      if ($insterid) {
        return $insertedID;
      } else {
        return TRUE;
      }
    } else {
      return false;
    }
  }

  /**
   * 删除表中数据
   * 
   * @param string $table 表名
   * @param string $where 'id ='.$id 条件
   * @return true or false
   */
  function DelData($table, $where, $aLog = false) {
    $db =  $this->getAdapter();
    if ($db->delete($table, $where)) {
      return TRUE;
    } else {
      return FALSE;
    }
  }

  /**
   * 更新表中数据
   *
   * @param string $table
   * @param array $adata
   * @param string $where 'id ='.$id
   * @return true or false
   */
  function UpdateData($table, $adata, $cond, $aLog = false) {
    $db =  $this->getAdapter();
    foreach ($adata as $key => $value) {
      $adata[$key] = $this->convert2gbk($value);
    }
    if ($db->update($table, $adata, $cond)) {
      return TRUE;
    } else {
      return false;
    }
  }


  public function clearTable($table) {
    $db = $this->getAdapter();
    $result = $db->query('TRUNCATE TABLE ' . $table);
  }

  public function executeSql($strSql) {
    $db = $this->getAdapter();
    $result = $db->query($strSql);
  }
  
  function convert2utf8($string)
  {
    return iconv("gbk","utf-8",$string);
  }
  function convert2gbk($string)
  {
    return iconv("utf-8","gbk",$string);
  }
}