Dapper获取连接类

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.OleDb;
using System.Data.SqlClient;
using System.Linq;
using System.Text;

namespace SmartCA
{
    public class DbConnection
    {
        public const string Platform = "Platform";

　　　　 /// <summary>
        /// 获取数据库连接并打开
        /// </summary>
        /// <param name="connnectionStringName"></param>
        /// <returns></returns>
        public static IDbConnection GetDbConnection(string connnectionStringName)
        {
            string provider = ConfigurationManager.ConnectionStrings[connnectionStringName].ProviderName;
            string connectionString = ConfigurationManager.ConnectionStrings[connnectionStringName].ConnectionString;
            IDbConnection connection;
            switch (provider)
            {
                case "MySql.Data.SqlClient":
                    connection = new SqlConnection(connectionString);
                    break;
                //case "MySql.Data.MySqlClient":
                //    connection = new MySqlConnection(connectionString);
                //    break;
                case "System.Data.Odbc":
                    connection = new OleDbConnection(connectionString);
                    break;
                case "System.Data.OleDb":
                    connection = new OleDbConnection(connectionString);
                    break;

                default:
                    connection = new SqlConnection(connectionString);
                    break;
            }
            if (connection.State == ConnectionState.Closed)
                connection.Open();
            return connection;
        }

    }

}