/// <summary>
/// 获取数据库连接，返回的连接已经打开(open)；在 mvc 框架中不用关闭，框架会自动关闭连接。
/// 之所以要传入 EntityInfo，因为 ORM 支持多个数据库，不同的类型有可能映射到不同的数据库。
/// </summary>
/// <param name="et"></param>
/// <returns></returns>
public static IDbConnection getConnection(EntityInfo et)
{
String db = et.Database;
String connectionString = DbConfig.GetConnectionString(db);
IDbConnection connection;
getConnectionAll().TryGetValue(db, out connection);
if (connection == null)
{
connection = DataFactory.GetConnection(connectionString, et.DbType);
connection.Open();
setConnection(db, connection);
if (shouldTransaction())
{
IDbTransaction trans = connection.BeginTransaction();
setTransaction(db, trans);
}
return(connection);
}
if (connection.State == ConnectionState.Closed)
{
connection.ConnectionString = connectionString;
connection.Open();
}
return(connection);
}
