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;
}

}

}