/// <summary> /// 克隆 /// </summary> /// <returns>查询SQL副本</returns> public override object Clone() { var newObject = base.Clone() as SelectSqlStatement; if (SelectList != null) { newObject.SelectList = SelectList.Clone() as SelectFieldListStatement; } if (From != null) { newObject.From = From.Clone() as From; } if (JoinCondition != null) { newObject.JoinCondition = JoinCondition.Clone() as JoinConditionStatement; } if (OrderByCondition != null) { newObject.OrderByCondition = OrderByCondition.Clone() as ConditionStatement; } if (FilterCondition != null) { newObject.FilterCondition = FilterCondition.Clone() as FilterConditionStatement; } if (MainFromItem != null) { newObject.MainFromItem = MainFromItem.Clone() as FromItem; } newObject.AliasCount = AliasCount; newObject.DictFieldAliasMapping = new Dictionary <string, string>(); foreach (KeyValuePair <string, string> map in DictFieldAliasMapping) { newObject.DictFieldAliasMapping.Add(map.Key, map.Value); } return(newObject); }