DB2中通用的存储过程分页程序

2/9/2008来源:DB2教程人气:8059

CREATE PROCEDURE SALES.DB2PAGINATION(IN ITBNAME VARCHAR(2000),-- 表名
     IN ISHOWFIELD VARCHAR(1000),-- 显示字段
     IN IJOIN VARCHAR(1000),-- 联接条件(如:内联、外联)
     IN IWHERE VARCHAR(2000),-- 查询条件 (注重: 不要加 WHERE)
     IN IORDER VARCHAR(100),-- 排序条件 (注重: 不要加 ORDER BY)
     IN ipAGESIZE INTEGER,-- 页尺寸 假如为0 默认返回前一百万条数据可以认为是返回所有数据
     INOUT IOCURRENTPAGEIX INTEGER,-- 输入和输出:当前页
     OUT OPAGESTARTROW INTEGER,-- 输出:当前开始行
     OUT OPAGEENDROW INTEGER,-- 输出:当前结束行
     OUT OTOTALROWS INTEGER,-- 输出:当前总记录数
     OUT OHaspREVIOUSPAGE INTEGER,-- 输出:是否有上一页
     OUT OHASNEXTPAGE INTEGER,-- 输出:是否有下一页
     OUT OTOTALPAGES INTEGER,-- 输出:总页数
     OUT OERROR VARCHAR(100))-- 输出:错误信息
  RESULT SETS 1
  MODIFIES SQL DATA
  NOT DETERMINISTIC
  LANGUAGE SQL
BEGIN
/**//*----------------------------------------------------------------
* Copyright (C) 2007 Huacius
* 版权所有。
*
* 存储过程分页
*
*
//-----------------------------------------------------------------------*/
DECLARE STRSQL  VARCHAR(6000);-- 主语句
  
DECLARE result CURSOR WITH RETURN TO CALLER FOR S2;
  
DECLARE exit handler FOR sqlexception-- 异常捕捉
BEGIN
set OERROR = 'error!';
END;
  
-- BODY start --
if(iwhere <> '') then
set iwhere = ' where ' || iwhere;
end if;
if(iorder <> '') then
set iorder = 'order by ' || iorder;
end if;
if(ijoin <> '') then
set ijoin = ' ' || ijoin;
end if;
 
set strsql = 'select count(*) from ' || itbname || ijoin || iwhere;
prepare s2 from strsql;
open result;
  fetch result into ototalrows;-- 总记录数
  close result;
  
if(ipagesize = 0) then
set ipagesize = 1000000;-- 每页显示数
end if;
  
set ototalpages = (ototalrows - 1) / ipagesize + 1;-- 总页数
  
if(iocurrentpageix < 1) then
set iocurrentpageix = 1;-- 当前页
else
if(iocurrentpageix > ototalpages) then
set iocurrentpageix = ototalpages;
end if;
end if;
  
set opagestartrow = ipagesize * (iocurrentpageix -1) + 1;-- 每页开始数
if(iocurrentpageix = ototalpages) then
set opageendrow = ototalrows;-- 每页结束数
else
set opageendrow = ipagesize * iocurrentpageix;
end if;
  
if(iocurrentpageix > 1) then
set ohaspreviouspage = 1;-- 是否有上一页
else
set ohaspreviouspage = 0;
end if;
  
if(iocurrentpageix < ototalpages) then
set ohasnextpage = 1;-- 是否有下一页
else
set ohasnextpage = 0;
end if;
  
set strsql = 'select * from (select rownumber() over(' || iorder || ') as rownum,'
|| ishowfield
|| ' from '
|| itbname
|| ijoin
|| iwhere
|| ') as temp where rownum between ' || rtrim(char(opagestartrow)) || ' and ' || rtrim(char(opageendrow));
prepare s2 from strsql;
open result;
-- BODY end --
  
END