PetaPoco ORM 增加返回DataTable的方法

 public DataTable ExecuteDataTable(Sql sql)
 {
     return ExecuteDataTable(sql.SQL, sql.Arguments);
 }
 public DataTable ExecuteDataTable(string sql, params object[] args)
 {
     try
     {
         OpenSharedConnection();
         try
         {
             using (var cmd = CreateCommand(_sharedConnection, sql, args))
             {
                 var val = cmd.ExecuteReader();
                 OnExecutedCommand(cmd);
                 var dt = new DataTable();
                 dt.Load(val);
                 return dt; //(T)Convert.ChangeType(val, typeof(T));
             }
         }
         finally
         {
             CloseSharedConnection();
         }
     }
     catch (Exception x)
     {
         OnException(x);
         throw;
     }
 }