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实例讲解"oracle"数据库的分页显示

create procedure pagetest --用于翻页的测试

--需要把排序字段放在第一列

(

@firstid nvarchar(20)=null, --当前页面里的第一条记录的排序字段的值

@lastid nvarchar(20)=null, --当前页面里的最后一条记录的排序字段的值

@isnext bit=null, --true 1 :下一页;false 0:上一页

@allcount int output, --返回总记录数

@pagesize int output, --返回一页的记录数

@curpage int --页号(第几页)0:第一页;-1最后一页。

)

as

if @curpage=0

begin

--统计总记录数

select @allcount=count(productid) from product_test

set @pagesize=10

--返回第一页的数据

select top 10

productid,

productname,

introduction

from product_test order by productid

end

else if @curpage=-1

select * from

(select top 10 productid,

productname,

introduction

from product_test order by productid desc ) as aa

order by productid

else

begin

if @isnext=1

--翻到下一页

select top 10 productid,

productname,

introduction

from product_test where productid > @lastid order by productid

else

--翻到上一页

select * from

(select top 10 productid,

productname,

introduction

from product_test where productid < @firstid order by productid desc) as bb order by productid

end

*******************************************************************************************************

create or replace procedure tablepage_select(v_page_size  int, --the size of a page of list

                       v_current_page int, --the current page of list

                       v_table_name varchar2, --the talbe name

                       v_order_field varchar2,--the order field

                       v_order_sequence varchar2,--the order sequence should by "_desc"or "_asc",_is blank.

                       --v_sql_select  varchar2, --the select sql for procedure

                       --v_sql_count  varchar2, --the count sql for procedure

                       --v_out_recordcount out int, --the num of return rows

                       p_cursor out refcursor_pkg.return_cursor) as

 v_sql     varchar2(3000); --the sql for select all rows of list

 v_sql_count  varchar2(3000); --the count sql for procedure

 v_sql_order  varchar2(2000); --the order of list

 v_count    int; -- the amount rows fo original list

 v_endrownum  int; --the end row num of the current page

 v_startrownum int; --the start row num of the current page

begin

 ----set the order of list

 if v_order_field!='no' then

  v_sql_order :=' order by '|| v_order_field ||' '||v_order_sequence;

 else

   v_sql_order :='';

 end if;

 ----catch the amount rows of list

 v_sql_count:='select count(rownum) from '||v_table_name;

 execute immediate v_sql_count into v_count;

 -- v_out_recordcount := v_count;

 ----set the value of start and end row

 if v_order_sequence='desc' then

  v_endrownum:=v_count-(v_current_page-1)*v_page_size;

  v_startrownum:=v_endrownum - v_page_size + 1;

 else

  v_endrownum:= v_current_page * v_page_size;

  v_startrownum := v_endrownum - v_page_size + 1;

 end if;

 ----the sql for page slide

 v_sql := 'select * from (select '||v_table_name||'.*, rownum rn from '||v_table_name||' where rownum <= ' ||

      to_char(v_endrownum) ||' '|| v_sql_order||') where rn >= ' ||

      to_char(v_startrownum)||' '||v_sql_order;

 open p_cursor for v_sql;

end tablepage_select;


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