mirror of
https://github.com/MariaDB/server.git
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139 lines
3.5 KiB
C++
139 lines
3.5 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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/* UNION of select's */
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/* UNION's were introduced by Monty and Sinisa <sinisa@mysql.com> */
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#include "mysql_priv.h"
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/* Union of selects */
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int mysql_union(THD *thd,LEX *lex,uint no_of_selects)
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{
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SELECT_LEX *sl, *for_order=&lex->select_lex; uint no=0; int res=0;
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List<Item> fields; TABLE *table=(TABLE *)NULL; TABLE_LIST *resulting=(TABLE_LIST *)NULL;
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for (;for_order->next;for_order=for_order->next);
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ORDER *some_order = (ORDER *)for_order->order_list.first;
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for (sl=&lex->select_lex;sl;sl=sl->next, no++)
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{
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TABLE_LIST *tables=(TABLE_LIST*) sl->table_list.first;
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if (!no) // First we do CREATE from SELECT
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{
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select_create *result;
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lex->create_info.options=HA_LEX_CREATE_TMP_TABLE;
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if ((result=new select_create(tables->db ? tables->db : thd->db,
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NULL, &lex->create_info,
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lex->create_list,
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lex->key_list,
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sl->item_list,DUP_IGNORE)))
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{
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res=mysql_select(thd,tables,sl->item_list,
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sl->where,
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sl->ftfunc_list,
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(ORDER*) NULL,
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(ORDER*) sl->group_list.first,
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sl->having,
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(ORDER*) some_order,
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sl->options | thd->options,
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result);
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if (res)
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{
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result->abort();
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delete result;
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return res;
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}
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table=result->table;
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List_iterator<Item> it(*(result->fields));
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Item *item;
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while ((item= it++))
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fields.push_back(item);
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delete result;
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if (!reopen_table(table)) return 1;
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if (!(resulting = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
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return 1;
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resulting->db=tables->db ? tables->db : thd->db;
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resulting->real_name=table->real_name;
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resulting->name=table->table_name;
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resulting->table=table;
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}
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else
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return -1;
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}
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else // Then we do INSERT from SELECT
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{
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select_result *result;
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if ((result=new select_insert(table, &fields, DUP_IGNORE)))
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{
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res=mysql_select(thd,tables,sl->item_list,
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sl->where,
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sl->ftfunc_list,
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(ORDER*) some_order,
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(ORDER*) sl->group_list.first,
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sl->having,
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(ORDER*) NULL,
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sl->options | thd->options,
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result);
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delete result;
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if (res) return 1;
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}
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else
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return -1;
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}
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}
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select_result *result;
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List<Item> item_list;
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List<Item_func_match> ftfunc_list;
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ftfunc_list.empty();
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if (item_list.push_back(new Item_field(NULL,NULL,"*")))
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return -1;
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if (lex->exchange)
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{
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if (lex->exchange->dumpfile)
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{
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if (!(result=new select_dump(lex->exchange)))
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return -1;
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}
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else
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{
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if (!(result=new select_export(lex->exchange)))
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return -1;
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}
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}
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else if (!(result=new select_send()))
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return -1;
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else
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{
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res=mysql_select(thd,resulting,item_list,
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NULL,
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ftfunc_list,
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(ORDER*) NULL,
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(ORDER*) NULL,
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NULL,
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(ORDER*) NULL,
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thd->options,
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result);
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if (res)
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result->abort();
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}
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delete result;
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return res;
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}
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