分页存储过程

标签：record   arc   bsp   pager   varchar   连接   arch   cut   开始   

--版本1  适用单表

create or replace procedure soa_getpager_v1(p_pagesize       number, --每页记录数
                                         p_pageno         number, --当前页码,从 1 开始
                                         p_sqlcols        varchar2, --选择列
                                         p_sqlfrom        varchar2, --表名OR连接查询
                                         p_sqlwhere       nvarchar2, --查询子句
                                         p_sqlorderby     varchar2, --排序
                                         p_outrecordcount out number, --返回总记录数
                                         p_outpagecount   out number, --返回总页数
                                         p_counts         out sys_refcursor) as
  v_sql       varchar2(3000);
  p_sqlselect varchar2(3000);
  v_count     number;
  v_heirownum number;
  v_lowrownum number;
  v_sqlerror  varchar2(100);
begin

  ----拼接SQL查询语句
  p_sqlselect = ‘select ‘  p_sqlcols  ‘ from ‘  p_sqlfrom
                 ‘ where ‘  p_sqlwhere;

  ----取记录总数
  v_sql = ‘select count(1) from ‘  p_sqlfrom  ‘ where ‘  p_sqlwhere;
  execute immediate v_sql
    into v_count;
  p_outrecordcount = v_count;

  ----取总页数
  p_outpagecount = p_outrecordcount  p_pagesize;
  if p_outpagecount = 0 then
    p_outpagecount = 1;
  end if;

  p_sqlselect = p_sqlselect  ‘ order by ‘  p_sqlorderby;

  ----执行分页查询
  v_heirownum = p_pageno  p_pagesize;
  v_lowrownum = v_heirownum - p_pagesize + 1;

  v_sql = ‘select  from (
                  select a.,rownum rn
                  from  ( ‘  p_sqlselect  ‘) a
                  where rownum = ‘  to_char(v_heirownum)  ‘
                 ) b
            where rn = ‘  to_char(v_lowrownum);

  --注意对rownum别名的使用,第一次直接用rownum,第二次一定要用别名rn
  dbms_output.put_line(v_sql);

  open p_counts for v_sql;

exception
  when others then
    v_sqlerror     = sqlerrm;
    p_outpagecount = -1;

end soa_getpager_v1;

--版本2 适用多表

create or replace procedure soa_getpager_v2(p_pagesize       number, --每页记录数
                                            p_pageno         number, --当前页码,从 1 开始
                                            p_sqlcols        varchar2, --选择列
                                            p_sqlfrom        varchar2, --表名OR连接查询
                                            p_sqlwhere       nvarchar2, --查询子句
                                            p_sqlorderby     varchar2, --排序
                                            p_outrecordcount out number, --返回总记录数
                                            p_outpagecount   out number, --返回总页数
                                            p_counts         out sys_refcursor) as
  v_sql       varchar2(3000);
  p_sqlselect varchar2(3000);
  v_count     number;
  v_heirownum number;
  v_lowrownum number;
  v_sqlerror  varchar2(100);
 
begin

  ----拼接SQL查询语句
  p_sqlselect := ‘select ‘ || p_sqlcols || ‘ from ‘ || p_sqlfrom ||
                 ‘ where ‘ || p_sqlwhere;

  ----取记录总数
  v_sql := ‘select count(1) from ‘ || p_sqlfrom || ‘ where ‘ || p_sqlwhere;
  execute immediate v_sql
    into v_count;
  p_outrecordcount := v_count;

  ----取总页数
  p_outpagecount := p_outrecordcount / p_pagesize;
  if p_outpagecount = 0 then
    p_outpagecount := 1;
  end if;

  p_sqlselect := p_sqlselect || ‘ order by ‘ || p_sqlorderby;

  ----执行分页查询
  v_heirownum := p_pageno * p_pagesize;
  v_lowrownum := v_heirownum - p_pagesize + 1;

  v_sql := ‘select * from (
                  select a.*,rownum rn
                  from  ( ‘ || p_sqlselect || ‘) a
                  where rownum <= ‘ || to_char(v_heirownum) || ‘
                 ) b
            where rn >= ‘ || to_char(v_lowrownum);

  --注意对rownum别名的使用,第一次直接用rownum,第二次一定要用别名rn
  dbms_output.put_line(v_sql);

  open p_counts for v_sql;

exception
  when others then
    v_sqlerror     := sqlerrm;
    p_outpagecount := -1;
 
end soa_getpager_v2;

分页存储过程

标签：record   arc   bsp   pager   varchar   连接   arch   cut   开始   

原文地址：http://www.cnblogs.com/iyoume2008/p/6100698.html