Access数据库没有数据库连接池，每次打开和关闭数据库时都非常耗时，自己编写了一个简易的数据库连接池，添加数据库类型还可支持其他没有数据库连接池的数据库类型。 该数据库连接池要求必须更改web.config中的数据库连接字符串，添加Max Pool Size及Connect Timeout两个属性，如：<add name="AccessConnectString" connectionString="”Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:"db.accdb;Max Pool Size=200;Connect Timeout=300"/>;，以获取需要最大的连接数量及连接对象生存期。 该数据库连接池是在关闭数据库连接，检验其他连接对象的生存期，这样在没有发出关闭数据库连接的请求时，一些已经超过生存期连接对象仍然在内存中，还无法做到与其他数据库连接池同样的效果。 数据库连接池代码如下： /// <summary> /// 连接对象。 /// </summary> public class Pool { /// <summary> /// 初始化。 /// </summary> /// <param name="id">代码。</param> /// <param name="connection">数据库连接对象。</param> /// <param name="isUse">使用标志。</param> /// <param name="openTime">打开时间。</param> public Pool(Guid id, IDbConnection connection, bool isUse, DateTime openTime) { this.id = id; this.connection = connection; IsUse = isUse; OpenTime = openTime; } private Guid id; /// <summary> /// 获取连接对象的代码。 /// </summary> public Guid Id { get { return id; } } private IDbConnection connection; /// <summary> /// 获取数据库连接对象。 /// </summary> public IDbConnection Connection { get { return connection; } } /// <summary> /// 获取或设置一个值，该值指示连接对象是否已经使用，true-已经使用，否则没有使用。 /// </summary> public bool IsUse { get; set; } /// <summary> /// 获取或设置连接对象打开数据库的时间。 /// </summary> public DateTime OpenTime { get; set; } } /// <summary> /// 连接池管理类。 /// </summary> public static class ConnectionPool { private static List<Pool> pools = new List<Pool>(); private static int poolTimeout = 300; private static int maxPoolSize = 200; private static string connectString = ""; private static bool getParam = false; static ConnectionPool() { } /// <summary> /// 获取参数。 /// </summary> /// <param name="connectionString">配置文件中的数据库连接字符串。</param> private static void GetParams(string connectionString) { string[] connectStrings = connectionString.Split(';'); StringBuilder newConnectString = new StringBuilder(); foreach (string subConnectString in connectStrings) { if (subConnectString.IndexOf("Provider", StringComparison.InvariantCultureIgnoreCase) != -1 || subConnectString.IndexOf("Data Source", StringComparison.InvariantCultureIgnoreCase) != -1) { newConnectString.Append(subConnectString); newConnectString.Append(";"); } if (subConnectString.IndexOf("Max Pool Size", StringComparison.InvariantCultureIgnoreCase) != -1) { string[] poolSizeses = subConnectString.Split('='); maxPoolSize = int.Parse(poolSizeses[1]); } if (subConnectString.IndexOf("Connect Timeout", StringComparison.InvariantCultureIgnoreCase) != -1) { string[] timeouts = subConnectString.Split('='); poolTimeout = int.Parse(timeouts[1]); } } connectString = newConnectString.ToString(); getParam = true; } /// <summary> /// 根据数据库类型创建数据库。 /// </summary> /// <param name="connectType">数据库连接类型。</param> /// <returns>指定数据库连接类型的数据库连接对象。</returns> private static IDbConnection CreateConnection(ConnectionType connectType) { switch (connectType) { case ConnectionType.OleConnectionType: return new OleDbConnection(connectString); default: throw new Exception("此数据库类型不能使用此连接池。"); } } /// <summary> /// 根据数据库连接字符串及数据库类型创建连接对象。 /// </summary> /// <param name="connectionString">数据库连接字符串。</param> /// <param name="connectType">数据库类型。</param> /// <returns>连接对象。</returns> public static Pool Open(string connectionString, ConnectionType connectType) { lock (typeof(ConnectionPool)) { if (!getParam) { GetParams(connectionString); } foreach (Pool pool in pools) { if (!pool.IsUse) { pool.IsUse = true; pool.OpenTime = DateTime.Now; return pool; } } if (pools.Count >= maxPoolSize) { throw new Exception("连接池的连接数已经超过最大值，不能再提供数据库连接。"); } Pool newPool = new Pool(Guid.NewGuid(), CreateConnection(connectType), true, DateTime.Now); pools.Add(newPool); newPool.Connection.Open(); return newPool; } } /// <summary> /// 关闭数据库连接。 /// </summary> /// <param name="closePool">需要关闭的连接池对象。</param> public static void Close(Pool closePool) { for (int num = pools.Count - 1; num >= 0; num--) { if (pools[num].Id == closePool.Id) { pools[num].IsUse = false; } else { if (pools[num].IsUse) { continue; } TimeSpan time = DateTime.Now - pools[num].OpenTime; if (time.TotalSeconds > poolTimeout) { pools[num].Connection.Close(); pools.Remove(pools[num]); } } } } } 调用代码： private connectionString = ConfigurationManager.ConnectionStrings[“AccessConnectString”].ToString(); //获取连接对象 private Pool pool=ConnectionPool.Open(connectionString, ConnectionType.OleConnectionType); //获取数据库连接对象 IDbConnection dbConnection= pool.Connection; 数据库操作 //关闭数据库连接 ConnectionPool.Close(pool);