IBM 为 DB2 9.5 提供的 ADO.NET Provider

虽然很多朋友都在用.NET作数据访问，但使用DB2的应该不多，偶尔使用也是用ODBC或OLE DB方式。

DB2 9.0+提供了支持.NET 2.0的ADO.NET Provider, 尤其对于使用PureXML开发XQuery的朋友而言，这个功能上要比OLE DB，ODBC的方式丰富。

我安装的是DB2 9.5 Express-C版本
开发环境是VS 2008，不过其实用VS 2005的DB 9.5 Visual Studio 2005 Add-ins更方便

基于代码的访问就不提了，这里介绍一个App.Config的方式（google了一下，找不到合适的，经过误打误撞碰出了providerName="IBM.Data.DB2"）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Diagnostics;
using System.Data.Common;
using System.Configuration;
namespace MarvellousXml.Library.Data
{
    /// <summary>
    /// 完成数据操作的抽象基类
    /// </summary>
    public class Database
    {
        protected string name;
        ConnectionStringSettings setting;

        public Database(string name)
        {
            this.name = name;
            this.setting = ConfigurationManager.ConnectionStrings[name];
        }

        /// <summary>
        /// 提供DbConnection实例
        /// </summary>
        /// <returns></returns>
        public DbConnection GetConnection()
        {
            return CreateConnection(this.name);
        }

        #region Helper Methods

        /// <summary>
        /// 根据配置构造DbConnection实例
        /// </summary>
        /// <param name="name"></param>
        /// <returns></returns>
        private DbConnection CreateConnection(string name)
        {
            if (string.IsNullOrEmpty(name))
                throw new ArgumentNullException("name");

            DbProviderFactory factory = DbProviderFactories.GetFactory(setting.ProviderName);
            DbConnection connection = factory.CreateConnection();
            connection.ConnectionString = setting.ConnectionString;
            return connection;
        }

        #endregion

    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.Data;
using System.Data.Common;
using MarvellousXml.Library.Data;
namespace MarvellousXml.Library.Data.Test
{
    [TestClass]
    public class DatabaseFixture
    {
        [TestMethod]
        public void CreateDb2Database()
        {
            string dbName = "DB2.Test";
            Database database = DatabaseFactory.Create(dbName);
            Assert.IsNotNull(database);
            DbConnection connection = database.GetConnection();
            connection.Open();
            Assert.IsTrue(connection.State == ConnectionState.Open);
        }
    }
}

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <connectionStrings>
    <add name="DB2.Test" connectionString="Database=SAMPLE;User ID=...;Server=127.0.0.1; Password = ...; Persist Security Info=True" providerName="IBM.Data.DB2"/>
  </connectionStrings>
</configuration>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
namespace MarvellousXml.Library.Data
{
    /// <summary>
    /// 构造Database的工厂类型 (还没有完成的毛坯)
    /// </summary>
    public static class DatabaseFactory
    {
        /// <summary>
        /// 构造
        /// </summary>
        /// <param name="name">逻辑连接名称</param>
        /// <returns>Database实例</returns>
        public static Database Create(string name)
        {
            return new Database(name);
        }

    }
}