分页查找总结
select * from (select e.*,rownum rn from (select * from emp) e) a1 where a1.rn > 6 and a1.rn< 10;select * from (select a1.*,rownum rn from(select * from emp) a1 where rownum<=10) where rn>=6;
select * from (select e.*,rownum rn from emp e) a1 where a1.rn between 6 and 10;
/**
* Oracle 分页sql语句生成方法
* @param sql sql语句
* @param pageIndex 页下标
* @param pageSize 页面大小
* @return
*/
publicstatic String createOraclePagingSql(String sql, int pageIndex, int pageSize){
int m = (pageIndex-1) * pageSize;
int n = m + pageSize;
StringBuffer pagingSelect = new StringBuffer(100);
pagingSelect.append("select * from ( select row_.*, rownum rownum_ from ( ")
.append(sql)
.append(" ) row_ where rownum <=")
.append(n)
.append(") where rownum_ >")
.append(n);
return pagingSelect.toString();
}
MySql分页查找
select * from dept order by deptno limit 4, 1;
表示从表dept的第四行 开始数后面的一条；
select * from dept order by deptno desc limit 4, 2;
表示从表dept的第四行开始，查找前面的两行；
在HQL中分页查找：
Query q = session.createQuery ( "from Category c order by c.name desc");
q.setMaxResult(4); 最多显示四条
q.setFirstResult(2); 设置从第二条开始
页:
[1]