Oracle万能分页存储过程

一，Oracle 创建存储过程

CREATE OR REPLACE PROCEDURE P_TEST_PAGING_QUERY(
    p_pagesql  IN VARCHAR2,         --sql
    p_curPage  IN OUT NUMBER ,      --当前页
    p_pageSize IN OUT NUMBER ,      --每页显示记录的条数
    p_totalRecords OUT NUMBER,      --总记录数
    p_totalPages OUT NUMBER ,       -- 总页数
    pageResultSet OUT SYS_REFCURSOR -- 输出结果集游标
  )
AS
  v_sql         VARCHAR2(2000):=''; --sql语句
  v_startRecord NUMBER;             --开始显示的记录数
  v_endRecord   NUMBER;             --结束显示的记录条数
BEGIN
  --记录总记录条数
  v_sql:='select count(*) FROM (' || p_pagesql || ')';
  EXECUTE IMMEDIATE v_sql INTO p_totalRecords;
  IF MOD(p_totalRecords,p_pageSize)=0 THEN
    --得到整数则直接取得到的页码数否在原来的基础上增加一个页码
    p_totalPages:=p_totalRecords/p_pageSize;
  ELSE
    p_totalPages:=p_totalRecords/p_pageSize+1;
  END IF;
  --验证页号
  IF p_curPage<1 THEN
    p_curPage:=1;
  END IF;
  --如果取的当前页大于总页数则取最大页数的数据
  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 t.*, ROWNUM RN from (' || p_pagesql || ') t where rownum<=' || v_endRecord || ' ) where RN>=' ||v_startRecord;
  p_totalPages  :=floor(p_totalPages); --去整数总页
  OPEN pageResultSet FOR v_sql;
EXCEPTION
WHEN OTHERS THEN
  CLOSE pageResultSet;
END P_TEST_PAGING_QUERY;

2，mybatis调用方式，2中方式调用

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.demo.dao.EmpMapper">

    <!-- 通用查询映射结果 -->
    <resultMap id="BaseResultMap" type="com.demo.model.Emp">
        <id column="EMPNO" property="empno" />
        <result column="ENAME" property="ename" />
        <result column="JOB" property="job" />
        <result column="MGR" property="mgr" />
        <result column="HIREDATE" property="hiredate" />
        <result column="SAL" property="sal" />
        <result column="COMM" property="comm" />
        <result column="DEPTNO" property="deptno" />
    </resultMap>

    <!-- 执行存储过程。语句类型statementType一定要为CALLABLE-->
    <!-- 入参定义：占位符形式写入SQL，然后接口中使用MAP传入 -->
    <!-- 参数模式：共IN、OUT、INOUT三种，如果是IN参可不写，此外IN存在 null的情况，必须指定 jdbcType，还有 OUT时必须指定 jdbcType -->
    <select id="test_exe_procedure1" statementType="CALLABLE">
        {CALL
        P_TEST_PAGING_QUERY(
        'select t.EMPNO, t.ENAME, t.JOB, t.MGR, t.HIREDATE, t.SAL, t.COMM, t.DEPTNO from scott.emp t',
        #{in_PAGE, mode=IN, jdbcType=INTEGER},
        #{in_ROWS, mode=IN, jdbcType=INTEGER},
        #{inout_TOTAL_RECORDS,mode=INOUT, jdbcType=INTEGER},
        #{inout_TOTAL_PAGES, mode=INOUT, jdbcType=INTEGER},
        #{out_SYSCURSOR, mode=OUT, jdbcType=CURSOR, javaType=java.sql.ResultSet, resultMap=BaseResultMap}
        )}
    </select>

    <!-- 执行存储过程2-->
    <!-- 入参定义：使用parameterMap进行参数映射，这时候存储过程参数占位符为：? -->
    <!-- 注意：调用存储过程的两个大括号和中间的内容不要换行！可能会出问题的。正确姿势：{CALL xxx(?,?...)} -->
    <parameterMap type="java.util.Map" id="test_exe_procedure2_param">
        <parameter property="in_SQL" mode="IN" jdbcType="VARCHAR" />
        <parameter property="in_PAGE" mode="IN" jdbcType="INTEGER" />
        <parameter property="in_ROWS" mode="IN" jdbcType="INTEGER" />
        <parameter property="inout_TOTAL_RECORDS" mode="INOUT" jdbcType="INTEGER" />
        <parameter property="inout_TOTAL_PAGES" mode="INOUT" jdbcType="INTEGER" />
        <parameter property="out_SYSCURSOR" mode="OUT" jdbcType="CURSOR" javaType="java.sql.ResultSet" resultMap="BaseResultMap" />
    </parameterMap>
    <select id="test_exe_procedure2" statementType="CALLABLE" parameterMap="test_exe_procedure2_param">
        {CALL P_TEST_PAGING_QUERY(?,?,?,?,?,?)}
    </select>

</mapper>

3，测试代码如下

private void test_exe_procedure(boolean bTestProcedure1)
	{
		int in_PAGE = 3;
		int in_ROWS =5;
		int inout_TOTAL_RECORDS=0;
		int inout_TOTAL_PAGES = 0;

		HashMap<String,Object> mm=new HashMap<String,Object>();
		mm.put("in_PAGE", in_PAGE);
		mm.put("in_ROWS", in_ROWS);
		mm.put("inout_TOTAL_RECORDS", inout_TOTAL_RECORDS);
		mm.put("inout_TOTAL_PAGES", inout_TOTAL_PAGES);
		mm.put("out_SYSCURSOR", new ArrayList<Emp>());

		if(bTestProcedure1)
		{
			System.out.println("test_exe_procedure1...");
			empMapper.test_exe_procedure1(mm);
		}
		else
		{
			System.out.println("test_exe_procedure2...");
			mm.put("in_SQL", "select t.EMPNO, t.ENAME, t.JOB, t.MGR, t.HIREDATE, t.SAL, t.COMM, t.DEPTNO from scott.emp t");
			empMapper.test_exe_procedure2(mm);
		}

		System.out.println("Get in_PAGE: "+ mm.get("in_PAGE"));
		System.out.println("Get in_ROWS: "+ mm.get("in_ROWS"));
		System.out.println("Get inout_TOTAL_RECORDS: "+ mm.get("inout_TOTAL_RECORDS"));
		System.out.println("Get inout_TOTAL_PAGES: "+ mm.get("inout_TOTAL_PAGES"));
		List<Emp> empList = (List<Emp>)mm.get("out_SYSCURSOR");
		Emp.Print(empList);
		return;
	}