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mysql教程之存储_MySQL

时间:2021-07-01 10:21:17 帮助过:27人阅读

最近用mysql + asp.net来写网站,既然mysql已经支持存储过程了,那么像分页这么常用的东西,当然要用存储过程啦

  不过在网上找了一些,发现都有一个特点――就是不能传出总记录数,干脆自己研究吧。终于,算是搞出来了,效率可能不是很好,但是我也觉得不错了。贴代码吧直接:也算是对自己学习mysql的一个记录。

  CREATE PROCEDURE p_pageList
  (
  m_pageNo int ,
  m_perPageCnt int ,
  m_column varchar(1000) ,
  m_table varchar(1000) ,
  m_condition varchar(1000),
  m_orderBy varchar(200) ,
  out m_totalPageCnt int
  )
  BEGIN
  SET @pageCnt = 1; -- 总记录数
  SET @limitStart = (m_pageNo - 1)*m_perPageCnt;
  SET @limitEnd = m_perPageCnt;
  SET @sqlCnt = CONCAT('select count(1) into @pageCnt from ',m_table); -- 这条语句很关键,用来得到总数值
  SET @sql = CONCAT('select ',m_column,' from ',m_table);
  IF m_condition IS NOT NULL AND m_condition <> '' THEN
  SET @sql = CONCAT(@sql,' where ',m_condition);
  SET @sqlCnt = CONCAT(@sqlCnt,' where ',m_condition);
  END IF;
  IF m_orderBy IS NOT NULL AND m_orderBy <> '' THEN
  SET @sql = CONCAT(@sql,' order by ',m_orderBy);
  END IF;
  SET @sql = CONCAT(@sql, ' limit ', @limitStart, ',', @limitEnd);
  PREPARE s_cnt from @sqlCnt;
  EXECUTE s_cnt;
  DEALLOCATE PREPARE s_cnt;
  SET m_totalPageCnt = @pageCnt;
  PREPARE record from @sql;
  EXECUTE record;
  DEALLOCATE PREPARE record;
  END

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