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如何在Oracle存储过程中实现分页

Jun 07, 2016 pm 04:15 PM
oracle Pagination storage accomplish

几乎每一个WEB应用都会用到分页,因此,将其做得通用高效就变得非常重要了,根据自己的想法用存储过程做了一个分页的存储过程,与大家分享,希望能够通过讨论得到更好的解决方案。 之所以用存储过程,是因为以后需要修改的话不需要修改程序代码,只需要修改

  几乎每一个WEB应用都会用到分页,因此,将其做得通用高效就变得非常重要了,,根据自己的想法用存储过程做了一个分页的存储过程,与大家分享,希望能够通过讨论得到更好的解决方案。

  之所以用存储过程,是因为以后需要修改的话不需要修改程序代码,只需要修改存储过程的代码。但这个例子是在存储过程里动态生成的SQL语句,不知道会不会因此失去存储过程一次编译和快速的特点。代码如下:

  1、首先建立一个包,用户创建一个游标类型

  create or replace package pkg_query as

  type cur_query is ref cursor;

  end pkg_query;

  2、创建存储过程

  CREATE OR REPLACE PROCEDURE prc_query

  (p_tableName in varchar2, --表名

  p_strWhere in varchar2, --查询条件

  p_orderColumn in varchar2, --排序的列

  p_orderStyle in varchar2, --排序方式

  p_curPage in out Number, --当前页

  p_pageSize in out Number, --每页显示记录条数

  p_totalRecords out Number, --总记录数

  p_totalPages out Number, --总页数

  v_cur out pkg_query.cur_query) --返回的结果集

  IS

  v_sql VARCHAR2(1000) := ''; --sql语句

  v_startRecord Number(4); --开始显示的记录条数

  v_endRecord Number(4); --结束显示的记录条数

  BEGIN

  --记录中总记录条数

  v_sql := 'SELECT TO_NUMBER(COUNT(*)) FROM ' || p_tableName || ' WHERE 1=1';

  IF p_strWhere IS NOT NULL or p_strWhere '' THEN

  v_sql := v_sql || p_strWhere;

  END IF;

  EXECUTE IMMEDIATE v_sql INTO p_totalRecords;

  --验证页面记录大小

  IF p_pageSize

  p_pageSize := 0;

  END IF;

  --根据页大小计算总页数

  IF MOD(p_totalRecords,p_pageSize) = 0 THEN

  p_totalPages := p_totalRecords / p_pageSize;

  ELSE

  p_totalPages := p_totalRecords / p_pageSize + 1;

  END IF;

  --验证页号

  IF p_curPage

  p_curPage := 1;

  END IF;

  IF p_curPage > p_totalPages THEN

  p_curPage := p_totalPages;

  END IF;

  --实现分页查询

  v_startRecord := (p_curPage - 1) * p_pageSize + 1;

  v_endRecord := p_curPage * p_pageSize;

  v_sql := 'SELECT * FROM (SELECT A.*, rownum r FROM ' ||

  '(SELECT * FROM ' || p_tableName;

  IF p_strWhere IS NOT NULL or p_strWhere '' THEN

  v_sql := v_sql || ' WHERE 1=1' || p_strWhere;

  END IF;

  IF p_orderColumn IS NOT NULL or p_orderColumn '' THEN

  v_sql := v_sql || ' ORDER BY ' || p_orderColumn || ' ' || p_orderStyle;

  END IF;

  v_sql := v_sql || ') A WHERE rownum = '

  || v_startRecord;

  DBMS_OUTPUT.put_line(v_sql);

  OPEN v_cur FOR v_sql;

  END prc_query;

  3、JAVA代码里取出结果集

  String sql= "{ call prc_query(?,?,?,?,?,?,?,?,?) }";

  CallableStatement call = con.prepareCall(sql);

  // ……中间数据设置及注册省略

  call.registerOutParameter(9, OracleTypes.CURSOR);

  // 取出结果集

 

  (ResultSet) call.getObject(9);

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