Class/DbFactoryHelper.cs

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using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.Common;
using System.Configuration;

namespace invite_bids
{
    public class DbFactoryHelper
    {
        /* 配置文件中需要添加配置信息
           <connectionStrings>
           <add name="ConnectionString" providerName="System.Data.SqlClient" connectionString="5678"/>
           </connectionStrings>
         */
        public static string ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["connstr"].ToString();
        private static DbProviderFactory DbProviderFactory = DbProviderFactories.GetFactory(System.Configuration.ConfigurationManager.ConnectionStrings["connstr"].ProviderName.ToString());

        #region CreateConnection

        /// <summary>
        /// CreateConnection
        /// </summary>
        /// <returns>DbConnection</returns>
        public static DbConnection CreateConnection()
        {
            DbConnection Conn = DbFactoryHelper.DbProviderFactory.CreateConnection();
            Conn.ConnectionString = DbFactoryHelper.ConnectionString;
            return Conn;
        }

        /// <summary>
        /// CreateConnection
        /// </summary>
        /// <param name="connectionName">string</param>
        /// <returns>DbConnection</returns>
        public static DbConnection CreateConnection(string connectionName)
        {
            DbProviderFactory dbProviderFactory = DbProviderFactories.GetFactory(System.Configuration.ConfigurationManager.ConnectionStrings[connectionName].ProviderName.ToString());
            DbConnection Conn = dbProviderFactory.CreateConnection();
            Conn.ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings[connectionName].ToString();
            return Conn;
        }

        #endregion

        #region CreateCommand

        /// <summary>
        /// CreateCommand
        /// </summary>
        /// <returns>DbCommand</returns>
        public static DbCommand CreateCommand()
        {
            return DbFactoryHelper.DbProviderFactory.CreateCommand();
        }

        /// <summary>
        /// CreateCommand