item_row.h
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:2k
- /* Copyright (C) 2000 MySQL AB
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
- class Item_row: public Item
- {
- Item **items;
- table_map used_tables_cache;
- uint arg_count;
- bool array_holder;
- bool const_item_cache;
- bool with_null;
- public:
- Item_row(List<Item> &);
- Item_row(Item_row *item):
- Item(),
- items(item->items),
- used_tables_cache(item->used_tables_cache),
- arg_count(item->arg_count),
- array_holder(0),
- const_item_cache(item->const_item_cache),
- with_null(0)
- {}
- enum Type type() const { return ROW_ITEM; };
- void illegal_method_call(const char *);
- bool is_null() { return null_value; }
- void make_field(Send_field *)
- {
- illegal_method_call((const char*)"make_field");
- };
- double val()
- {
- illegal_method_call((const char*)"val");
- return 0;
- };
- longlong val_int()
- {
- illegal_method_call((const char*)"val_int");
- return 0;
- };
- String *val_str(String *)
- {
- illegal_method_call((const char*)"val_str");
- return 0;
- };
- bool fix_fields(THD *thd, TABLE_LIST *tables, Item **ref);
- void split_sum_func(THD *thd, Item **ref_pointer_array, List<Item> &fields);
- table_map used_tables() const { return used_tables_cache; };
- bool const_item() const { return const_item_cache; };
- enum Item_result result_type() const { return ROW_RESULT; }
- void update_used_tables();
- void print(String *str);
- bool walk(Item_processor processor, byte *arg);
- uint cols() { return arg_count; }
- Item* el(uint i) { return items[i]; }
- Item** addr(uint i) { return items + i; }
- bool check_cols(uint c);
- bool null_inside() { return with_null; };
- void bring_value();
- };