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a554151951
sql/sql_delete.cc: new order in global select list sql/sql_derived.cc: removed recursion from derived tables sql/sql_insert.cc: new order in global select list sql/sql_lex.h: pointer to global select list sql/sql_select.cc: new order in global select list sql/sql_update.cc: new order in global select list
123 lines
3.5 KiB
C++
123 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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/*
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Derived tables
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These were introduced by Monty and Sinisa <sinisa@mysql.com>
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*/
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#include "mysql_priv.h"
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#include "sql_select.h"
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#include "sql_acl.h"
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static const char *any_db="*any*"; // Special symbol for check_access
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int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit, TABLE_LIST *t)
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{
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/*
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TODO: make derived tables with union inside (now only 1 SELECT may be
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procesed)
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*/
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SELECT_LEX *sl= unit->first_select();
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List<Item> item_list;
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TABLE *table;
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int res= 0;
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select_union *derived_result;
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TABLE_LIST *tables= (TABLE_LIST *)sl->table_list.first;
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TMP_TABLE_PARAM tmp_table_param;
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DBUG_ENTER("mysql_derived");
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if (tables)
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res= check_table_access(thd,SELECT_ACL, tables);
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else
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res= check_access(thd, SELECT_ACL, any_db);
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if (res)
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DBUG_RETURN(-1);
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Item *item;
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List_iterator<Item> it(sl->item_list);
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while ((item= it++))
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item_list.push_back(item);
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if (!(res=open_and_lock_tables(thd,tables)))
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{
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if (setup_fields(thd,tables,item_list,0,0,1))
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{
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res=-1;
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goto exit;
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}
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bzero((char*) &tmp_table_param,sizeof(tmp_table_param));
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tmp_table_param.field_count=item_list.elements;
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if (!(table=create_tmp_table(thd, &tmp_table_param, item_list,
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(ORDER*) 0, 0, 1, 0,
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(sl->options | thd->options |
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TMP_TABLE_ALL_COLUMNS),
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unit)))
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{
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res=-1;
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goto exit;
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}
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if ((derived_result=new select_union(table)))
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{
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derived_result->tmp_table_param=&tmp_table_param;
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unit->offset_limit_cnt= sl->offset_limit;
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unit->select_limit_cnt= sl->select_limit+sl->offset_limit;
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if (unit->select_limit_cnt < sl->select_limit)
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unit->select_limit_cnt= HA_POS_ERROR;
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if (unit->select_limit_cnt == HA_POS_ERROR)
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sl->options&= ~OPTION_FOUND_ROWS;
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SELECT_LEX_NODE *save_current_select= lex->current_select;
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lex->current_select= sl;
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res= mysql_select(thd, tables, sl->item_list,
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sl->where, (ORDER *) sl->order_list.first,
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(ORDER*) sl->group_list.first,
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sl->having, (ORDER*) NULL,
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sl->options | thd->options | SELECT_NO_UNLOCK,
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derived_result, unit, sl, 0);
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lex->current_select= save_current_select;
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if (!res)
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{
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// Here we entirely fix both TABLE_LIST and list of SELECT's as there were no derived tables
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if (derived_result->flush())
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res=1;
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else
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{
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t->real_name=table->real_name;
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t->table=table;
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table->derived_select_number= sl->select_number;
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table->tmp_table=TMP_TABLE;
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if (!lex->describe)
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sl->exclude();
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t->db=(char *)"";
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t->derived=(SELECT_LEX *)0; // just in case ...
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}
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}
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delete derived_result;
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}
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if (res)
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free_tmp_table(thd,table);
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exit:
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close_thread_tables(thd);
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}
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DBUG_RETURN(res);
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}
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