分页存储过程-Oracle版

在Oracle中使用分页存储过程相比较Sql Server来说，要复杂一些，数据集的返回需要使用游标。本人的分页存储过程是在Oracle包中实现的。

--首先定义包头部分
--pFilter参数为查询条件字符串，如“ NCID='1' and NDate='2012-1-1'”

CREATE OR REPLACE PACKAGE PKG_NEWS IS

type CurBase is ref cursor;

procedure SearchNews (pFilter in varchar2,pPage number,pRecordPerPage out number,pAllRecord out number,CurNews out CurBase);

END;

--然后定义包的主体部分
CREATE OR REPLACE PACKAGE BODY PKG_NEWS IS

--搜索新闻，注意分页部分还可以再优化一下。
procedure SearchNews (pFilter in varchar2,pPage number,pRecordPerPage out number,pAllRecord out number,CurNews out CurBase) is
vSQL Varchar(1000);
begin
  pRecordPerPage:=30;
  vSQL:='select count(*) from V3News where (1=1)  ' || pFilter;
  execute immediate vSQL into pAllRecord;

  vSQL:='select RNum,NID,NCID,NCName,NFrom,NName,NDate,NClick from (select RowNum RNum,V3News.* from V3News where (1=1) '|| pFilter || ') V3News  where RNum>' ||

to_char((pPage-1)*pRecordPerPage) || ' and RNum<=' || to_char(pPage*pRecordPerPage);
  open CurNews for vSQL ;
end;

END;

.net程序DAO层

using System;

using System.Collections.Generic;

using System.Text;

using System.Data;

using System.Data.OracleClient;



namespace NewsDal

{

    /// <summary>

    /// 新闻Oracle数据访问层

    /// 作者：

    /// 创建时间：2007-5-25

    /// 最后修改：

    /// 最后修改时间：

    /// </summary>

    public class News

    {

        private OracleProvider objDBConn = new OracleProvider();

        private OracleConnection objConn;

        private OracleCommand objCmd;

        private OracleDataAdapter objDA;

        private DataSet objDS;

        private OracleParameter objPA;



        /// <summary>

        /// 分页获取新闻

        /// </summary>

        public DataTable GetPageNews(int ipage, out int irecordperpage, out double iallrecord)

        {

            irecordperpage = 0;

            iallrecord = 0;

            try

            {

                objConn = objDBConn.Conn;

                objCmd = new OracleCommand("PKG_News.GetPageNews", objConn);

                objCmd.CommandType = CommandType.StoredProcedure;

                objPA = new OracleParameter("pPage", ipage);

                objCmd.Parameters.Add(objPA);

                objPA = new OracleParameter("pRecordPerPage", OracleType.Number);

                objPA.Direction = ParameterDirection.Output;

                objCmd.Parameters.Add(objPA);

                objPA = new OracleParameter("pAllRecord", OracleType.Number);

                objPA.Direction = ParameterDirection.Output;

                objCmd.Parameters.Add(objPA);

                OracleParameter curNews = new OracleParameter("CurNews", OracleType.Cursor);

                curNews.Direction = ParameterDirection.Output;

                objCmd.Parameters.Add(curNews);

                objDA = new OracleDataAdapter(objCmd);

                objDS = new DataSet();

                if (objConn.State == ConnectionState.Closed)

                    objConn.Open();



                objCmd.ExecuteNonQuery();

                objDA.Fill(objDS, "V3News");

                if (objCmd.Parameters["pRecordPerPage"].Value == DBNull.Value || objCmd.Parameters["pRecordPerPage"].Value.ToString() == "")

                    irecordperpage = 0;

                else

                    irecordperpage = Convert.ToInt32(objCmd.Parameters["pRecordPerPage"].Value);

                if (objCmd.Parameters["pAllRecord"].Value == DBNull.Value || objCmd.Parameters["pAllRecord"].Value.ToString() == "")

                    iallrecord = 0;

                else

                    iallrecord = Convert.ToDouble(objCmd.Parameters["pAllRecord"].Value);

                return objDS.Tables["V3News"];

            }

            catch (Exception e)

            {

                throw e;

            }

            finally

            {

                if (objConn.State == ConnectionState.Open)

                    objConn.Close();

            }

        }

    }

}