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oracle中使用触发器实现查询分页功能

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Release: 2016-06-07 16:21:33
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oracle包分为包规范和包体 一:首先创建包规范 create or replace package p_pagewithgroup is -- Author : 肖伟 -- Created : 2014/3/18 -- Purpose : 分组分页过程 TYPE type_cur IS REF CURSOR; --定义游标变量用于返回记录集 PROCEDURE UP_GetRecordWith

   oracle包分为包规范和包体

  一:首先创建包规范

  create or replace package p_pagewithgroup is

  -- Author : 肖伟

  -- Created : 2014/3/18

  -- Purpose : 分组分页过程

  TYPE type_cur IS REF CURSOR; --定义游标变量用于返回记录集

  PROCEDURE UP_GetRecordWithGroupByPage(

  tblName in varchar2, --表名

  PageSize in number, --页面大小

  PageIndex in number, --当前页

  IsReCount out number,--返回总条数

  strWhere in varchar2,-- 查询条件 (注意: 不要加 where)

  strColums in varchar2, --字段集合,逗号分割

  strSelectColums in varchar2, --字段集合,逗号分割

  strGroup in varchar2,--分组条件语句

  strOrder in varchar2,-- 排序条件语句

  v_cur out type_cur --返回当前页数据记录

  );

  end p_pagewithgroup;

  二:创建包结构体

  create or replace package body p_pagewithgroup is

  PROCEDURE UP_GetRecordWithGroupByPage(

  tblName in varchar2, --表名

  PageSize in number, --页面大小

  PageIndex in number, --当前页

  IsReCount out number,--返回总条数

  strWhere in varchar2,-- 查询条件 (注意: 不要加 where)

  strColums in varchar2, --字段集合,逗号分割

  strSelectColums in varchar2, --字段集合,逗号分割

  strGroup in varchar2,--分组条件语句

  strOrder in varchar2,-- 排序条件语句

  v_cur out type_cur --返回当前页数据记录

  )

  AS

  --定义变量

  v_sql VARCHAR2(8000);

  v_count number;

  v_row_start NUMBER; --开始记录

  v_row_end NUMBER; --结束记录

  begin

  ------------------------------------------------------------显示总条数

  v_sql := 'select count(1) from ' || tblName;

  IF strWhere is not NULL OR strWhere ''

  THEN

  v_sql := v_sql || ' where ' || strWhere;

  END IF;

  IF strGroup is not null or strGroup ''

  then

  v_sql := v_sql || ' group by ' || strGroup;

  end if;

  DBMS_OUTPUT.put_line (v_sql);

  --v_sql:='select count(1) from BS_USER where 1=1';

  EXECUTE IMMEDIATE v_sql into v_count ;

  IsReCount:=v_count;

  ------------------------------------------------------------显示任意页内容

  -- IF PageSize

  -- PageSize:=1;

  -- END IF;

  v_row_start := (PageIndex - 1) * PageSize + 1;

  v_row_end := PageIndex * PageSize;

  v_sql:='select '||strSelectColums||' from (select t.*,RowNum as rn from (select '||strColums||' from '||tblName;

  IF strWhere is not NULL OR strWhere ''

  THEN

  v_sql := v_sql || ' where ' || strWhere;

  END IF;

  IF strGroup is not null or strGroup ''

  then

  v_sql := v_sql || ' group by ' || strGroup;

  end if;

  IF strOrder is not null or strOrder ''

  then

  v_sql := v_sql || ' order by ' || strOrder;

  end if;

  v_sql := v_sql ||') t) where rn between '||v_row_start||' and '||v_row_end;

  DBMS_OUTPUT.put_line (v_sql);

  open v_cur for v_sql;

  End UP_GetRecordWithGroupByPage;

  ----------------------------------------------------------

  end p_pagewithgroup;

  三:测试

  首先打开PL/SQL command window

  SQL>declare

  -- Local variables here

  IsReCount number;--返回总条数

  my_cur p_pagewithgroup.type_cur ; --返回当前页数据记录

  begin

  -- Test statements here

  p_pagewithgroup.UP_GetRecordWithGroupByPage('T_DIVISION',5,1,ISReCount,' 1=1 ',' * ',' * ',null,null,my_cur );

  DBMS_OUTPUT.PUT_LINE(TO_CHAR(IsReCount));

  end;

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