四款mysql 分页存储过程实例
mysql测试版本：5.0.41-community-nt
/*****************************************************
mysql分页存储过程
吴剑 2009-07-02
*****************************************************/
drop procedure if exists pr_pager;
create procedure pr_pager(
in p_table_name varchar(1024), /*表名*/
in p_fields varchar(1024), /*查询字段*/
in p_page_size int, /*每页记录数*/
in p_page_now int, /*当前页*/
in p_order_string varchar(128), /*排序条件(包含order关键字,可为空)*/
in p_where_string varchar(1024), /*where条件(包含where关键字,可为空)*/
out p_out_rows int /*输出记录总数*/
)
not deterministic
sql security definer
comment '分页存储过程'
begin
/*定义变量*/
declare m_begin_row int default 0;
declare m_limit_string char(64);
/*构造语句*/
set m_begin_row = (p_page_now - 1) * p_page_size;
set m_limit_string = concat(' limit ', m_begin_row, ', ', p_page_size);
set @count_string = concat('select count(*) into @rows_total from ', p_table_name, ' ', p_where_string);
set @main_string = concat('select ', p_fields, ' from ', p_table_name, ' ', p_where_string, ' ', p_order_string, m_limit_string);
/*预处理*/
prepare count_stmt from @count_string;
execute count_stmt;
deallocate prepare count_stmt;
set p_out_rows = @rows_total;
prepare main_stmt from @main_string;
execute main_stmt;
deallocate prepare main_stmt;
end
一款高效的存储过程分页代码
存储过程分页的基本原理:我们先对查找到的记录集(支持输入查找条件_whereclause和排列条件_orderby)的key字段临时存放到临时表,然后构建真正的记录集输出。
create procedure `mysqltestuser_select_pageable`(
_whereclause varchar(2000), -- 查找条件
_orderby varchar(2000), -- 排序条件
_pagesize int , -- 每页记录数
_pageindex int , -- 当前页码
_docount bit -- 标志:统计数据/输出数据
)
not deterministic
sql security definer
comment ' '
begin
-- 定义key字段临时表
drop table if exists _temptable_keyid; -- 删除临时表,如果存在
create temporary table _temptable_keyid
(
userid int
)type=heap;
-- 构建动态的sql，输出关键字key的id集合
-- 查找条件
set @sql = 'select userid from mysqltestuser ';
if (_whereclause is not null) and (_whereclause <> ' ') then
set @sql= concat(@sql, ' where ' ,_whereclause);
end if;
if (_orderby is not null) and (_orderby <> ' ') then
set @sql= concat( @sql , ' order by ' , _orderby);
end if;
-- 准备id记录插入到临时表
set @sql=concat( 'insert into _temptable_keyid(userid) ', @sql);
prepare stmt from @sql;
execute stmt ;
deallocate prepare stmt;
-- key的id集合 [end]
-- 下面是输出
if (_docount=1) then -- 统计
begin
select count(*) as recordcount from _temptable_keyid;
end;
else -- 输出记录集
begin
-- 计算记录的起点位置
set @startpoint = ifnull((_pageindex-1)*_pagesize,0);
set @sql= ' select a.*
from mysqltestuser a
inner join _temptable_keyid b
on a.userid =b.userid ';
set @sql=concat(@sql, " limit ",@startpoint, " , ",_pagesize);
prepare stmt from @sql;
execute stmt ;
deallocate prepare stmt;
end;
end if;
drop table _temptable_keyid;
end;
下面是mysqltestuser表的ddl:
create table `mysqltestuser` (
`userid` int(11) not null auto_increment,
`name` varchar(50) default null,
`chinesename` varchar(50) default null,
`registerdatetime` datetime default null,
`jf` decimal(20,2) default null,
`description` longtext,
primary key (`userid`)
) engine=innodb default charset=gb2312;
插入些数据:
insert into `mysqltestuser` (`userid`, `name`, `chinesename`, `registerdatetime`, `jf`, `description`) values
(1, 'xuu1 ', 'www.aimeige.com.cn ', '2007-03-29 12:54:41 ',1.5, 'description1 '),
(2, 'xuu2 ', 'www.111com.net ', '2007-03-29 12:54:41 ',2.5, 'description2 '),
存储过程调用测试:
-- 方法原型 `mysqltestuser_select_pageable`(条件,排列顺序,每页记录数,第几页,是否统计数据)
-- call `mysqltestuser_select_pageable`(_whereclause ,_orderby ,_pagesize ,_pageindex , _docount)
-- 统计数据
call `mysqltestuser_select_pageable`(null, null, null, null, 1)
-- 输出数据,没条件限制,10条记录/页,第一页
call `mysqltestuser_select_pageable`(null, null, 10, 1,0)
-- 输出数据,条件限制,排列, 10条记录/页,第一页
call `mysqltestuser_select_pageable`( 'chinesename like ' '%飞3% ' ' ', 'userid asc ', 10, 1, 0)
一款mysql .net的方法
mysql + asp教程.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
方法四
mysql的通用存储过程，本着共享的精神，为大家奉献这段mysql分页查询通用存储过程，假设所用数据库教程为guestbook：
use guestbook;
delimiter $$
drop procedure if exists prc_page_result $$
create procedure prc_page_result (
in currpage int,
in columns varchar(500),
in tablename varchar(500),
in scondition varchar(500),
in order_field varchar(100),
in asc_field int,
in primary_field varchar(100),
in pagesize int
)
begin
declare stemp varchar(1000);
declare ssql varchar(4000);
declare sorder varchar(1000);
if asc_field = 1 then
set sorder = concat( order by , order_field, desc );
set stemp = <(select min;
else
set sorder = concat( order by , order_field, asc );
set stemp = >(select max;
end if;
if currpage = 1 then
if scondition <> then
set ssql = concat(select , columns, from , tablename, where );
set ssql = concat(ssql, scondition, sorder, limit ?);
else
set ssql = concat(select , columns, from , tablename, sorder, limit ?);
end if;
else
if scondition <> then
set ssql = concat(select , columns, from , tablename);
set ssql = concat(ssql, where , scondition, and , primary_field, stemp);
set ssql = concat(ssql, (, primary_field, ), from (select );
set ssql = concat(ssql, , primary_field, from , tablename, sorder);
set ssql = concat(ssql, limit , (currpage-1)*pagesize, ) as tabtemp), sorder);
set ssql = concat(ssql, limit ?);
else
set ssql = concat(select , columns, from , tablename);
set ssql = concat(ssql, where , primary_field, stemp);
set ssql = concat(ssql, (, primary_field, ), from (select );
set ssql = concat(ssql, , primary_field, from , tablename, sorder);
set ssql = concat(ssql, limit , (currpage-1)*pagesize, ) as tabtemp), sorder);
set ssql = concat(ssql, limit ?);
end if;
end if;
set @ipagesize = pagesize;
set @squery = ssql;
prepare stmt from @squery;
execute stmt using @ipagesize;
end;
$$
delimiter;
可以存储为数据库脚本，然后用命令导入：
mysql -u root -p < pageresult.sql;
调用：call prc_page_result(1, "*", "tablename", "", "columnname", 1, "pkid", 25);
*/
?>
