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/* 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 */
/* UNION of select's */
/* UNION's were introduced by Monty and Sinisa <sinisa@mysql.com> */
#include "mysql_priv.h"
/* Union of selects */
int mysql_union(THD *thd,LEX *lex,uint no_of_selects)
{
SELECT_LEX *sl, *for_order=&lex->select_lex; uint no=0; int res=0;
select_create *create_result;
List<Item> fields; TABLE *table=(TABLE *)NULL; TABLE_LIST *resulting=(TABLE_LIST *)NULL;
for (;for_order->next;for_order=for_order->next);
ORDER *some_order = (ORDER *)for_order->order_list.first;
for (sl=&lex->select_lex;sl;sl=sl->next, no++)
{
TABLE_LIST *tables=(TABLE_LIST*) sl->table_list.first;
if (!no) // First we do CREATE from SELECT
{
lex->create_info.options=HA_LEX_CREATE_TMP_TABLE;
lex->create_info.db_type=DB_TYPE_MYISAM;
lex->create_info.row_type = ROW_TYPE_DEFAULT;
lex->create_info.avg_row_length = 0;
lex->create_info.max_rows=INT_MAX; lex->create_info.min_rows=0;
lex->create_info.comment=lex->create_info.password=NullS;
lex->create_info.data_file_name=lex->create_info.index_file_name=NullS;
lex->create_info.raid_type=lex->create_info.raid_chunks=0;
lex->create_info.raid_chunksize=0;
lex->create_info.if_not_exists=false;
lex->create_info.used_fields=0;
if ((create_result=new select_create(tables->db ? tables->db : thd->db,
"ZVEK", &lex->create_info,
lex->create_list,
lex->key_list,
sl->item_list,DUP_IGNORE,true)))
{
res=mysql_select(thd,tables,sl->item_list,
sl->where,
sl->ftfunc_list,
(ORDER*) NULL,
(ORDER*) sl->group_list.first,
sl->having,
(ORDER*) some_order,
sl->options | thd->options,
create_result);
if (res)
{
create_result->abort();
delete create_result;
return res;
}
table=create_result->table;
/* List_iterator<Item> it(*(create_result->fields));
Item *item;
while ((item= it++))
fields.push_back(item);*/
if (!(resulting = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
return 1;
resulting->db=tables->db ? tables->db : thd->db;
resulting->real_name=table->real_name;
resulting->name=table->table_name;
resulting->table=table;
}
else
return -1;
}
else // Then we do INSERT from SELECT
{
select_insert *result;
if ((result=new select_insert(table, create_result->fields, DUP_IGNORE, true)))
{
res=mysql_select(thd,tables,sl->item_list,
sl->where,
sl->ftfunc_list,
(ORDER*) some_order,
(ORDER*) sl->group_list.first,
sl->having,
(ORDER*) NULL,
sl->options | thd->options,
result);
delete result;
if (res)
{
delete create_result;
return res;
}
}
else
{
delete create_result;
return -1;
}
}
}
select_result *result;
List<Item> item_list;
List<Item_func_match> ftfunc_list;
ftfunc_list.empty();
void(item_list.push_back(new Item_field(NULL,NULL,"*")));
if (lex->exchange)
{
if (lex->exchange->dumpfile)
result=new select_dump(lex->exchange);
else
result=new select_export(lex->exchange);
}
else result=new select_send();
if (result)
{
res=mysql_select(thd,resulting,item_list,
NULL,
ftfunc_list,
(ORDER*) NULL,
(ORDER*) NULL,
NULL,
(ORDER*) NULL,
thd->options,
result);
if (res)
result->abort();
delete result;
}
else
res=-1;
delete create_result;
return res;
}
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