dapper的一个小扩展以支持dataset

 1         public static DataSet ExecuteDataSet(this IDbConnection cnn, IDbDataAdapter adapter, string sql, object param = null, bool buffered = true, int? commandTimeout = null, CommandType? commandType = null)
 2         {
 3             var ds = new DataSet();
 4             var command = new CommandDefinition(sql, (object)param, null, commandTimeout, commandType, buffered ? CommandFlags.Buffered : CommandFlags.None);
 5             var identity = new Identity(command.CommandText, command.CommandType, cnn, null, param == null ? null : param.GetType(), null);
 6             var info = GetCacheInfo(identity, param, command.AddToCache);
 7             bool wasClosed = cnn.State == ConnectionState.Closed;
 8             if (wasClosed) cnn.Open();
 9             adapter.SelectCommand = command.SetupCommand(cnn, info.ParamReader);
10             adapter.Fill(ds);
11             if (wasClosed) cnn.Close();
12             return ds;
13         }