Oracle与C#存储过程分页

--分页
select * from(select t1.ename ,rownum rn from (select * from emp) t1 where rownum<=10) where rn>=6;

 

--开发一个包
create or replace package tespackage as
type test_cursor is ref cursor;
end tespackage;

--分页存储过程
create or replace procedure sp_fengye
(tableName in varchar2,--参数1 表名字
pagesize in number,
pageNow in number,
myrows out number,--总记录数
myPageCount out number,--总页数
p_cursor out tespackage.test_cursor --返回记录集
)is
--定义部分
 --定义sql语句 字符串
 v_sql varchar2(1000);
--定义两个整数
v_begin number:=(pageNow-1)*pagesize+1;  --从哪里开始取
v_end number:=pageNow*pagesize;
begin
--执行部分
v_sql:='select * from(select t1.ename ,rownum rn from
 (select * from '||tableName||' order by sal) t1 where rownum<='||v_end||') where rn>='||v_begin;
--把游标和sql语句关联起来
open p_cursor for v_sql;
--计算myrows和myPageCount的值
--组织一个sql
v_sql:='select count(*) from'||tableName;
--执行sql，并把返回值赋给myrows；
execute immediate  v_sql into myrows;
--计算myPagweCount
if mod(myrows,pagesize)=0 then
myPageCount:=myrows/pagesize;
else
myPageCount:=myrows/pagesize+1;
end if;
--关闭游标
close p_cursor;
end;

 

　　直接调用Oracle中的存储过程完成对表的分页,对代码封闭程度高,执行高效.以下为C#分页类代码,包括Oracle数据库端存储过程PLSQL代码.

 

#endregion

#endregion
using System;
using System.Collections.Generic;
using System.Web;
using System.Data.OracleClient;
using System.Data;

/// <summary>
///调用Oracle存储过程对表进行分页
/// </summary>
public class Pagination
{
   
    string m_procedureName;//要调用的存储过程名称
    OracleConnection m_oracleConnection; //Oracle连接对象

    /// <summary>
    /// 构造函数,传入存储过程名称与连接对象
    /// </summary>
    /// <param name="procedureName">存储过程名称</param>
    /// <param name="orclConnection">初始化后连接字符串的Oracle连接对象</param>
 public Pagination(string procedureName,OracleConnection orclConnection)
 {
        m_procedureName = procedureName;
        m_oracleConnection = orclConnection;
 }
   
    /// <summary>
    /// 执行分页
    /// </summary>
    /// <param name="tableName">需分页表名</param>
    /// <param name="paeSize">每页记录数</param>
    /// <param name="indexNowPage">当前页码</param>
    /// <param name="totalRows">引用参数,总记录数</param>
    /// <param name="totalPages">引用参数,总页数</param>
    /// <returns>分页结果集</returns>
    public DataTable Paging(string tableName, int paeSize, int indexNowPage, ref int totalRows, ref int totalPages)
    {
        try
        {
            //打开连接
            OpenOracleConnection();

            //定义OracleCommand对象,设置命令类型为存储过程
            OracleCommand pOracleCMD = new OracleCommand(m_procedureName, m_oracleConnection);
            pOracleCMD.CommandType = CommandType.StoredProcedure;

            //根据存储过程的参数个数及类型生成参数对象
            OracleParameter p1 = new OracleParameter("rowCountPerPage", OracleType.Number, 10);
            OracleParameter p2 = new OracleParameter("indexNowPage", OracleType.Number, 10);
            OracleParameter p3 = new OracleParameter("tabName", OracleType.VarChar, 50);
            OracleParameter p4 = new OracleParameter("totalRows", OracleType.Number, 10);
            OracleParameter p5 = new OracleParameter("totalPages", OracleType.Int16, 10);
            OracleParameter p6 = new OracleParameter("p_cursor", OracleType.Cursor);

            //设置参数的输入输出类型,默认为输入
            p1.Direction = ParameterDirection.Input;
            p2.Direction = ParameterDirection.Input;
            p3.Direction = ParameterDirection.Input;
            p4.Direction = ParameterDirection.Output;
            p5.Direction = ParameterDirection.Output;
            p6.Direction = ParameterDirection.Output;

            //对输入参数定义初值,输出参数不必赋值.
            p1.Value = paeSize;
            p2.Value = indexNowPage;
            p3.Value = tableName;

            //按照存储过程参数顺序把参数依次加入到OracleCommand对象参数集合中
            pOracleCMD.Parameters.Add(p1);
            pOracleCMD.Parameters.Add(p2);
            pOracleCMD.Parameters.Add(p3);
            pOracleCMD.Parameters.Add(p4);
            pOracleCMD.Parameters.Add(p5);
            pOracleCMD.Parameters.Add(p6);

            //执行,把分页结果集填入datatable中
            OracleDataAdapter pOracleDataAdapter = new OracleDataAdapter(pOracleCMD);
            DataTable datatable = new DataTable();
            pOracleDataAdapter.Fill(datatable);

            //在执行结束后,从存储过程输出参数中取得相应的值放入引用参数中以供程序调用
            totalRows = int.Parse(p4.Value.ToString());
            totalPages = int.Parse(p5.Value.ToString());

            //关闭连接
            CloseOracleConnection();

            return datatable;
        }
        catch(Exception ex)
        {
            return null;
        }

    }

    /// <summary>
    /// 关闭连接
    /// </summary>
    private void CloseOracleConnection()
    {
        if (m_oracleConnection.State == ConnectionState.Open)
        {
            m_oracleConnection.Close();
        }
    }

    /// <summary>
    /// 打开连接
    /// </summary>
    private void OpenOracleConnection()
    {
        if (m_oracleConnection.State== ConnectionState.Closed)
        {
            m_oracleConnection.Open();
        }
    }

}