Oracle分页函数样例——用于提高当前框架分页性能


create or replace procedure P_QuerySplit(

  sqlscript varchar2, --表名/SQL语句

  pageSize integer, --每页记录数

  pageIndex integer, --当前页

  totalCount out number, --总记录数

  totalPage out number, --总页数

  v_cur out sys_refcursor --返回游标

  ) is

  /**

  *
  *

  */

  v_PageSize number;

  v_PageIndex number;

  v_SQL_Count varchar2(4000);

  v_SQL varchar2(4000);

  v_StartIndex number;

  v_EndIndex number;

  begin

  v_PageSize:=pageSize;

  if v_PageSize=0 then

  v_PageSize:=1;

  end if;

  --统计记录数量

  v_SQL_Count := 'select count(*) from (' ? ? sqlscript ? ?') a ';

  execute immediate v_SQL_Count into totalCount;

  --计算总页数

  totalPage:=CEIL(totalCount/v_PageSize);

 --验证页号 如果页号大余了最大页数,返回最后一页

  v_PageIndex:=pageIndex;

  if v_PageIndex>totalPage then

  v_PageIndex:=totalPage;

  end if;

  --计算开始的Index和结束的Index

  v_StartIndex:=(v_PageIndex-1)*v_PageSize 1;

  v_EndIndex:=v_PageIndex*v_PageSize;

  v_SQL:='SELECT /* FIRST_ROWS */* FROM (';

  v_SQL:=v_SQL ? ?' SELECT A.*, ROWNUM RN ';

  v_SQL:=v_SQL ? ?' FROM (' ? ?sqlscript ? ?') A ';

  v_SQL:=v_SQL ? ?' WHERE ROWNUM <= ' ? ?v_EndIndex;

  v_SQL:=v_SQL ? ?')WHERE RN >= ' ? ?v_StartIndex;

  open v_cur for v_SQL;

  end P_QuerySplit;

  带排序的分页存储过程

  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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