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https://github.com/MariaDB/server.git
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135 lines
3.4 KiB
C++
135 lines
3.4 KiB
C++
/* Copyright (C) 2000 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* subselect Item */
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#ifdef __GNUC__
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#pragma interface /* gcc class implementation */
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#endif
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class st_select_lex;
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class JOIN;
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class select_subselect;
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/* base class for subselects */
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class Item_subselect :public Item
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{
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protected:
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uint max_columns;
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my_bool assigned; /* value already assigned to subselect */
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my_bool executed; /* simple subselect is executed */
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my_bool optimized; /* simple subselect is optimized */
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my_bool error; /* error in query */
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int exec();
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virtual void assign_null()
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{
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null_value= 1;
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}
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public:
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st_select_lex *select_lex;
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JOIN *join;
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select_subselect *result;
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Item_subselect(THD *thd, st_select_lex *select_lex,
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select_subselect* result);
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Item_subselect(Item_subselect *item)
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{
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null_value= item->null_value;
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decimals= item->decimals;
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max_columns= item->max_columns;
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assigned= item->assigned;
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executed= item->executed;
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select_lex= item->select_lex;
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join= item->join;
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result= item->result;
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name= item->name;
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error= item->error;
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}
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enum Type type() const;
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bool is_null() { return null_value; }
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void make_field (Send_field *);
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bool fix_fields(THD *thd, TABLE_LIST *tables, Item **ref);
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table_map used_tables() const;
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friend class select_subselect;
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};
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/* single value subselect */
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class Item_singleval_subselect :public Item_subselect
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{
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protected:
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longlong int_value;
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double real_value;
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enum Item_result res_type;
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virtual void assign_null()
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{
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null_value= 1;
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int_value= 0;
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real_value= 0;
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max_length= 4;
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res_type= STRING_RESULT;
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}
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public:
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Item_singleval_subselect(THD *thd, st_select_lex *select_lex);
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Item_singleval_subselect(Item_singleval_subselect *item):
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Item_subselect(item)
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{
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int_value= item->int_value;
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real_value= item->real_value;
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max_length= item->max_length;
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decimals= item->decimals;
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res_type= item->res_type;
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}
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double val ();
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longlong val_int ();
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String *val_str (String *);
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Item *new_item() { return new Item_singleval_subselect(this); }
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enum Item_result result_type() const { return res_type; }
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friend class select_singleval_subselect;
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};
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/* exists subselect */
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class Item_exists_subselect :public Item_subselect
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{
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protected:
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longlong value;
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virtual void assign_null()
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{
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value= 0;
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}
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public:
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Item_exists_subselect(THD *thd, st_select_lex *select_lex);
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Item_exists_subselect(Item_exists_subselect *item):
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Item_subselect(item)
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{
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value= item->value;
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}
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Item *new_item() { return new Item_exists_subselect(this); }
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enum Item_result result_type() const { return INT_RESULT;}
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longlong val_int();
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double val();
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String *val_str(String*);
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friend class select_exists_subselect;
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};
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