五、Java持久化基础-Oracle、MySQL和SqlServe分页查询的语句区别

Oracle、MySQL和SqlServe分页查询的语句区别

 

★先来定义分页语句将要用到的几个参数：

• int currentPage ; //当前页
• int pageRecord ; //每页显示记录数

以之前的ADDRESSBOOK数据表为例(每页显示10条记录)：

 

一、SqlServe数据库分页语句

String sql = "select top "+pageRecord +" * from addressbook where id not in (select top "+(currentPage-1)*pageRecord +" id from t_user)";
// (currentPage-1)*pageRecord : 是指从第几个记录开始

第二页SQL演示：

select top 20 * from addressbook where id not in (select top 10 id from addressbook)

 

二、MySQL数据库分页语句

String sql = "select * from addressbook where limit "+(currentPage-1)*pageRecord +","+pageRecord +"";
		 
//select * from 表名 【条件】limit M,N;   
//M为从第几个记录开始，比如每页显示3条记录，第二页就必须从第4条记录开始
//N每页读几个数据

第二页SQL演示：

select * from addressbook where limit 10,10

 

三、Oracle数据库分页语句

String sqls = "select * from ( select rownum rn,t.* from addressbook t where rownum <= "+currentPage*pageRecord+" ) where rownum > "+(currentPage -1)*pageRecord;
		

第二页SQL演示：

select * from ( select rownum rn,t.* from addressbook where rownum<= 20 ) where rownum > 10