WindDC — Fri, 01 Dec 2006 09:11:00 GMT

本文是用.net实现的数据库链接�?大体体现了数据库链接池的实现思想,ADO.NET已经提供了很好的链接池维�?所以本�E�序基本没有什么实用�h(hu��n)�?

1.链接池管理类
using System;
using System.Data;
using System.Data.SqlClient;
using System.Data.OleDb;
using System.Collections;
using System.Configuration;

///

/// DbConnectionPool 的摘要说�?br />///

namespace dbopr
{
    public class DbConnectionPool
    {
        //定义存放数据库链接的队列
        private static Queue connections=new Queue();

//数据库参�?br /> private static string ConnString = ""; //链接字符�?/p>

        //链接池参�?br />        private static int InitSize = 20;                                         //初始化链接池大小
        private static int MaxSize = 100;                                         //最大链接数
        private static int QueueSize = 50;                                        //队列中最大维护的链接�?br />        private static int ConnNum = 0;                                           //�pȝ��l�护的链接��L��

        //定义数据库类型，1表示为SqlServer数据库，2表示其它的OLE DB�Q�默认�ؓ(f��)SqlServer
        private static int DbType = 1;
        public static int DbType
        {
            set
            {
                DbType = value;
            }
        }

        private DbConnectionPool()
        {
            try{
                ConnString = Configuration.connectionStrings["DbSource"].connectionString;
                InitSize = int.Parse(Configuration.connectionStrings["InitSize"].connectionString);
                MaxSize = int.Parse(Configuration.connectionStrings["MaxSize"].connectionString);
                QueueSize = int.Parse(Configuration.connectionStrings["QueueSize"].connectionString);
                DbType = int.Parse(Configuration.connectionStrings["DbType"].connectionString);
                initPool();
            }
            catch(Exception e) {
            }
        }

        //初始化链接池
        private static void initPool(){
            int i;
            for (i = 1; i <= InitSize; i++) {
                if (DbType == 1)
                    connections.Enqueue(newSqlConn());
                else
                    connections.Enqueue(newOleConn());
            }
        }

        //获取一个Sql Server链接对象
        private static SqlConnection newSqlConn()
        {
            ConnNum++;
            return new SqlConnection(ConnString);
        }

        //获取一个OLE DB链接对像
        private static OleDbConnection newOleConn()
        {
            ConnNum++;
            return new OleDbConnection(ConnString);
        }

        //获取一个数据库链接
        public static IDbConnection getConn() {
            if (connections.Count == 0)                                  //如果队列中链接用完，则新��Z��个链接放入队�?br />            {
                if (ConnNum > MaxSize)                                   //如果当前�z�d��链接辑ֈ�最大，则等待链�?br />                    return null;
                else
                {
                    if (DbType == 1)
                        connections.Enqueue(newSqlConn());
                    else
                        connections.Enqueue(newOleConn());
                    return connections.Dequeue();
                }
            }
            else
                return connections.Dequeue();
        }

        //释放一个活�q�链�?br />        public static void reConn(IDbConnection conn) {
            if (connections.Count > QueueSize)                           //如果队列中元素个数已辑ֈ�最大，则关闭链�?br />                conn.Close();
            else
                connections.Enqueue(conn);
        }

        //销毁链接池
        public static void ClearPool() {
            while(connections.Count>0)
                 (IDbConnection)connections.Dequeue().Close();
        }
    }
}

2.链接生成�c?br />using System;
using System.Data;
using System.Data.SqlClient;
using System.Data.OleDb;
using System.Configuration;
using System.Web;

///

/// DbConn 的摘要说�?br />///

namespace dbopr
{
    public class DbConnection
    {
        private static IDbConnection conn;

        public DbConnection()
        {
            //
            // TODO: 在此处添加构造函数逻辑
            //
        }

        public static SqlConnection getSqlConn()
        {
            //获取链接池中的Sql Server的链�?br />            conn = DbConnectionPool.getConn();
            return (SqlConnection)conn;
        }

        public static OleDbConnection getOleConn() {
            //获取其它OLE DB的链�?br />            conn = DbConnectionPool.getConn();
            return (OleDbConnection)conn;
        }

        public static void Close() {
            //攑֛�用过的链�?br />            DbConnectionPool.reConn(conn);
        }
    }
}

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