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8b81ac649fc71d680266e7b0f294ebe78cf3886c
mariadb/sql/sql_update.cc
unknown 933e16a388 fixed st_select_lex initialization 
fixed mustiupdate subselect compatibility

(bug 217)



mysql-test/r/subselect.result:
  test of multi-update & subselect
mysql-test/t/subselect.test:
  test of multi-update & subselect
sql/sql_update.cc:
  added subselect compatibility to query cache
sql/sql_yacc.yy:
  right st_select_lex initialization 
  layout fix
2003-04-05 09:29:28 +03:00

976 lines
27 KiB
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Raw Blame History

/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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 */
/* Update of records
Multi-table updates were introduced by Monty and Sinisa <sinisa@mysql.com>
*/
#include "mysql_priv.h"
#include "sql_acl.h"
#include "sql_select.h"
static bool safe_update_on_fly(JOIN_TAB *join_tab, List<Item> *fields);
/* Return 0 if row hasn't changed */
static bool compare_record(TABLE *table, ulong query_id)
{
if (!table->blob_fields)
return cmp_record(table,1);
/* Compare null bits */
if (memcmp(table->null_flags,
table->null_flags+table->rec_buff_length,
table->null_bytes))
return 1; // Diff in NULL value
/* Compare updated fields */
for (Field **ptr=table->field ; *ptr ; ptr++)
{
if ((*ptr)->query_id == query_id &&
(*ptr)->cmp_binary_offset(table->rec_buff_length))
return 1;
}
return 0;
}
int mysql_update(THD *thd,
TABLE_LIST *table_list,
List<Item> &fields,
List<Item> &values,
COND *conds,
uint order_num, ORDER *order,
ha_rows limit,
enum enum_duplicates handle_duplicates)
{
bool using_limit=limit != HA_POS_ERROR;
bool safe_update= thd->options & OPTION_SAFE_UPDATES;
bool used_key_is_modified, transactional_table, log_delayed;
int error=0;
uint used_index, want_privilege;
ulong query_id=thd->query_id, timestamp_query_id;
key_map old_used_keys;
TABLE *table;
SQL_SELECT *select;
READ_RECORD info;
TABLE_LIST *update_table_list= (TABLE_LIST*)
thd->lex.select_lex.table_list.first;
DBUG_ENTER("mysql_update");
LINT_INIT(used_index);
LINT_INIT(timestamp_query_id);
if ((open_and_lock_tables(thd, table_list)))
DBUG_RETURN(-1);
fix_tables_pointers(thd->lex.all_selects_list);
table= table_list->table;
table->file->info(HA_STATUS_VARIABLE | HA_STATUS_NO_LOCK);
thd->proc_info="init";
/* Calculate "table->used_keys" based on the WHERE */
table->used_keys=table->keys_in_use;
table->quick_keys=0;
want_privilege=table->grant.want_privilege;
table->grant.want_privilege=(SELECT_ACL & ~table->grant.privilege);
if (setup_tables(update_table_list) ||
setup_conds(thd,update_table_list,&conds)
|| setup_ftfuncs(&thd->lex.select_lex))
DBUG_RETURN(-1); /* purecov: inspected */
if (find_real_table_in_list(table_list->next,
table_list->db, table_list->real_name))
{
my_error(ER_UPDATE_TABLE_USED, MYF(0), table_list->real_name);
DBUG_RETURN(-1);
}
old_used_keys=table->used_keys; // Keys used in WHERE
/*
Change the query_id for the timestamp column so that we can
check if this is modified directly
*/
if (table->timestamp_field)
{
timestamp_query_id=table->timestamp_field->query_id;
table->timestamp_field->query_id=thd->query_id-1;
table->time_stamp= table->timestamp_field->offset() +1;
}
/* Check the fields we are going to modify */
table->grant.want_privilege=want_privilege;
if (setup_fields(thd, 0, update_table_list, fields, 1, 0, 0))
DBUG_RETURN(-1); /* purecov: inspected */
if (table->timestamp_field)
{
// Don't set timestamp column if this is modified
if (table->timestamp_field->query_id == thd->query_id)
table->time_stamp=0;
else
table->timestamp_field->query_id=timestamp_query_id;
}
/* Check values */
table->grant.want_privilege=(SELECT_ACL & ~table->grant.privilege);
if (setup_fields(thd, 0, update_table_list, values, 0, 0, 0))
{
free_underlaid_joins(thd, &thd->lex.select_lex);
DBUG_RETURN(-1); /* purecov: inspected */
}
// Don't count on usage of 'only index' when calculating which key to use
table->used_keys=0;
select=make_select(table,0,0,conds,&error);
if (error ||
(select && select->check_quick(safe_update, limit)) || !limit)
{
delete select;
free_underlaid_joins(thd, &thd->lex.select_lex);
if (error)
{
DBUG_RETURN(-1); // Error in where
}
send_ok(thd); // No matching records
DBUG_RETURN(0);
}
/* If running in safe sql mode, don't allow updates without keys */
if (!table->quick_keys)
{
thd->lex.select_lex.options|=QUERY_NO_INDEX_USED;
if (safe_update && !using_limit)
{
delete select;
free_underlaid_joins(thd, &thd->lex.select_lex);
send_error(thd,ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE);
DBUG_RETURN(1);
}
}
init_ftfuncs(thd, &thd->lex.select_lex, 1);
/* Check if we are modifying a key that we are used to search with */
if (select && select->quick)
used_key_is_modified= (!select->quick->unique_key_range() &&
check_if_key_used(table,
(used_index=select->quick->index),
fields));
else if ((used_index=table->file->key_used_on_scan) < MAX_KEY)
used_key_is_modified=check_if_key_used(table, used_index, fields);
else
used_key_is_modified=0;
if (used_key_is_modified || order)
{
/*
We can't update table directly; We must first search after all
matching rows before updating the table!
*/
table->file->extra(HA_EXTRA_DONT_USE_CURSOR_TO_UPDATE);
IO_CACHE tempfile;
if (open_cached_file(&tempfile, mysql_tmpdir,TEMP_PREFIX,
DISK_BUFFER_SIZE, MYF(MY_WME)))
{
delete select; /* purecov: inspected */
free_underlaid_joins(thd, &thd->lex.select_lex);
DBUG_RETURN(-1);
}
if (old_used_keys & ((key_map) 1 << used_index))
{
table->key_read=1;
table->file->extra(HA_EXTRA_KEYREAD);
}
if (order)
{
uint length;
SORT_FIELD *sortorder;
TABLE_LIST tables;
List<Item> fields;
List<Item> all_fields;
ha_rows examined_rows;
bzero((char*) &tables,sizeof(tables));
tables.table = table;
table->io_cache = (IO_CACHE *) my_malloc(sizeof(IO_CACHE),
MYF(MY_FAE | MY_ZEROFILL));
if (setup_ref_array(thd, &thd->lex.select_lex.ref_pointer_array,
order_num)||
setup_order(thd, thd->lex.select_lex.ref_pointer_array,
&tables, fields, all_fields, order) ||
!(sortorder=make_unireg_sortorder(order, &length)) ||
(table->found_records = filesort(thd, table, sortorder, length,
(SQL_SELECT *) 0,
HA_POS_ERROR, &examined_rows))
== HA_POS_ERROR)
{
delete select;
free_underlaid_joins(thd, &thd->lex.select_lex);
DBUG_RETURN(-1);
}
}
init_read_record(&info,thd,table,select,0,1);
thd->proc_info="Searching rows for update";
while (!(error=info.read_record(&info)) && !thd->killed)
{
if (!(select && select->skipp_record()))
{
table->file->position(table->record[0]);
if (my_b_write(&tempfile,table->file->ref,
table->file->ref_length))
{
error=1; /* purecov: inspected */
break; /* purecov: inspected */
}
}
else
{
if (!(test_flags & 512)) /* For debugging */
{
DBUG_DUMP("record",(char*) table->record[0],table->reclength);
}
}
}
end_read_record(&info);
if (table->key_read)
{
table->key_read=0;
table->file->extra(HA_EXTRA_NO_KEYREAD);
}
/* Change select to use tempfile */
if (select)
{
delete select->quick;
if (select->free_cond)
delete select->cond;
select->quick=0;
select->cond=0;
}
else
{
select= new SQL_SELECT;
select->head=table;
}
if (reinit_io_cache(&tempfile,READ_CACHE,0L,0,0))
error=1; /* purecov: inspected */
select->file=tempfile; // Read row ptrs from this file
if (error >= 0)
{
delete select;
free_underlaid_joins(thd, &thd->lex.select_lex);
DBUG_RETURN(-1);
}
}
if (handle_duplicates == DUP_IGNORE)
table->file->extra(HA_EXTRA_IGNORE_DUP_KEY);
init_read_record(&info,thd,table,select,0,1);
ha_rows updated=0L,found=0L;
thd->count_cuted_fields=1; /* calc cuted fields */
thd->cuted_fields=0L;
thd->proc_info="Updating";
query_id=thd->query_id;
while (!(error=info.read_record(&info)) && !thd->killed)
{
if (!(select && select->skipp_record()))
{
store_record(table,1);
if (fill_record(fields,values) || thd->net.report_error)
break; /* purecov: inspected */
found++;
if (compare_record(table, query_id))
{
if (!(error=table->file->update_row((byte*) table->record[1],
(byte*) table->record[0])))
{
updated++;
if (!--limit && using_limit)
{
error= -1;
break;
}
}
else if (handle_duplicates != DUP_IGNORE ||
error != HA_ERR_FOUND_DUPP_KEY)
{
table->file->print_error(error,MYF(0));
error= 1;
break;
}
}
}
else
table->file->unlock_row();
}
end_read_record(&info);
thd->proc_info="end";
VOID(table->file->extra(HA_EXTRA_NO_IGNORE_DUP_KEY));
transactional_table= table->file->has_transactions();
log_delayed= (transactional_table || table->tmp_table);
if (updated && (error <= 0 || !transactional_table))
{
mysql_update_log.write(thd,thd->query,thd->query_length);
if (mysql_bin_log.is_open())
{
Query_log_event qinfo(thd, thd->query, thd->query_length,
log_delayed);
if (mysql_bin_log.write(&qinfo) && transactional_table)
error=1; // Rollback update
}
if (!log_delayed)
thd->options|=OPTION_STATUS_NO_TRANS_UPDATE;
}
if (transactional_table)
{
if (ha_autocommit_or_rollback(thd, error >= 0))
error=1;
}
/*
Store table for future invalidation or invalidate it in
the query cache if something changed
*/
if (updated)
{
query_cache_invalidate3(thd, table_list, 1);
}
if (thd->lock)
{
mysql_unlock_tables(thd, thd->lock);
thd->lock=0;
}
delete select;
free_underlaid_joins(thd, &thd->lex.select_lex);
if (error >= 0)
send_error(thd,thd->killed ? ER_SERVER_SHUTDOWN : 0); /* purecov: inspected */
else
{
char buff[80];
sprintf(buff,ER(ER_UPDATE_INFO), (long) found, (long) updated,
(long) thd->cuted_fields);
send_ok(thd,
(thd->client_capabilities & CLIENT_FOUND_ROWS) ? found : updated,
thd->insert_id_used ? thd->insert_id() : 0L,buff);
DBUG_PRINT("info",("%d records updated",updated));
}
thd->count_cuted_fields=0; /* calc cuted fields */
free_io_cache(table);
DBUG_RETURN(0);
}
/***************************************************************************
Update multiple tables from join
***************************************************************************/
/*
Setup multi-update handling and call SELECT to do the join
*/
int mysql_multi_update(THD *thd,
TABLE_LIST *table_list,
List<Item> *fields,
List<Item> *values,
COND *conds,
ulong options,
enum enum_duplicates handle_duplicates,
SELECT_LEX_UNIT *unit, SELECT_LEX *select_lex)
{
int res;
multi_update *result;
TABLE_LIST *tl;
DBUG_ENTER("mysql_multi_update");
table_list->grant.want_privilege=(SELECT_ACL & ~table_list->grant.privilege);
if ((res=open_and_lock_tables(thd,table_list)))
DBUG_RETURN(res);
fix_tables_pointers(thd->lex.all_selects_list);
thd->select_limit=HA_POS_ERROR;
if (setup_fields(thd, 0, table_list, *fields, 1, 0, 0))
DBUG_RETURN(-1);
/*
Count tables and setup timestamp handling
*/
for (tl= select_lex->get_table_list() ; tl ; tl=tl->next)
{
TABLE *table= tl->table;
if (table->timestamp_field)
{
table->time_stamp=0;
// Only set timestamp column if this is not modified
if (table->timestamp_field->query_id != thd->query_id)
table->time_stamp= table->timestamp_field->offset() +1;
}
}
if (!(result=new multi_update(thd, table_list, fields, values,
handle_duplicates)))
DBUG_RETURN(-1);
List<Item> total_list;
res= mysql_select(thd, &select_lex->ref_pointer_array,
select_lex->get_table_list(), select_lex->with_wild,
total_list,
conds, 0, (ORDER *) NULL, (ORDER *)NULL, (Item *) NULL,
(ORDER *)NULL,
options | SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK,
result, unit, select_lex, 0);
delete result;
DBUG_RETURN(res);
}
multi_update::multi_update(THD *thd_arg, TABLE_LIST *table_list,
List<Item> *field_list, List<Item> *value_list,
enum enum_duplicates handle_duplicates_arg)
:all_tables(table_list), update_tables(0), thd(thd_arg), tmp_tables(0),
updated(0), found(0), fields(field_list), values(value_list),
table_count(0), copy_field(0), handle_duplicates(handle_duplicates_arg),
do_update(1), trans_safe(0)
{}
/*
Connect fields with tables and create list of tables that are updated
*/
int multi_update::prepare(List<Item> &not_used_values, SELECT_LEX_UNIT *unit)
{
TABLE_LIST *table_ref;
SQL_LIST update;
table_map tables_to_update= 0;
Item_field *item;
List_iterator_fast<Item> field_it(*fields);
List_iterator_fast<Item> value_it(*values);
uint i, max_fields;
DBUG_ENTER("multi_update::prepare");
thd->count_cuted_fields=1;
thd->cuted_fields=0L;
thd->proc_info="updating main table";
while ((item= (Item_field *) field_it++))
tables_to_update|= item->used_tables();
if (!tables_to_update)
{
my_error(ER_NOT_SUPPORTED_YET, MYF(0),
"You didn't specify any tables to UPDATE");
DBUG_RETURN(1);
}
/*
We have to check values after setup_tables to get used_keys right in
reference tables
*/
if (setup_fields(thd, 0, all_tables, *values, 1, 0, 0))
DBUG_RETURN(1);
/*
Save tables beeing updated in update_tables
update_table->shared is position for table
Don't use key read on tables that are updated
*/
update.empty();
for (table_ref= all_tables; table_ref; table_ref=table_ref->next)
{
TABLE *table=table_ref->table;
if (tables_to_update & table->map)
{
TABLE_LIST *tl= (TABLE_LIST*) thd->memdup((char*) table_ref,
sizeof(*tl));
if (!tl)
DBUG_RETURN(1);
update.link_in_list((byte*) tl, (byte**) &tl->next);
tl->shared= table_count++;
table->no_keyread=1;
table->used_keys=0;
table->pos_in_table_list= tl;
}
}
table_count= update.elements;
update_tables= (TABLE_LIST*) update.first;
tmp_tables = (TABLE **) thd->calloc(sizeof(TABLE *) * table_count);
tmp_table_param = (TMP_TABLE_PARAM*) thd->calloc(sizeof(TMP_TABLE_PARAM) *
table_count);
fields_for_table= (List_item **) thd->alloc(sizeof(List_item *) *
table_count);
values_for_table= (List_item **) thd->alloc(sizeof(List_item *) *
table_count);
if (thd->is_fatal_error)
DBUG_RETURN(1);
for (i=0 ; i < table_count ; i++)
{
fields_for_table[i]= new List_item;
values_for_table[i]= new List_item;
}
if (thd->is_fatal_error)
DBUG_RETURN(1);
/* Split fields into fields_for_table[] and values_by_table[] */
field_it.rewind();
while ((item= (Item_field *) field_it++))
{
Item *value= value_it++;
uint offset= item->field->table->pos_in_table_list->shared;
fields_for_table[offset]->push_back(item);
values_for_table[offset]->push_back(value);
}
if (thd->is_fatal_error)
DBUG_RETURN(1);
/* Allocate copy fields */
max_fields=0;
for (i=0 ; i < table_count ; i++)
set_if_bigger(max_fields, fields_for_table[i]->elements);
copy_field= new Copy_field[max_fields];
DBUG_RETURN(thd->is_fatal_error != 0);
}
/*
Initialize table for multi table
IMPLEMENTATION
- Update first table in join on the fly, if possible
- Create temporary tables to store changed values for all other tables
that are updated (and main_table if the above doesn't hold).
*/
bool
multi_update::initialize_tables(JOIN *join)
{
TABLE_LIST *table_ref;
DBUG_ENTER("initialize_tables");
if ((thd->options & OPTION_SAFE_UPDATES) && error_if_full_join(join))
DBUG_RETURN(1);
main_table=join->join_tab->table;
trans_safe= transactional_tables= main_table->file->has_transactions();
log_delayed= trans_safe || main_table->tmp_table != NO_TMP_TABLE;
table_to_update= 0;
/* Create a temporary table for keys to all tables, except main table */
for (table_ref= update_tables; table_ref; table_ref=table_ref->next)
{
TABLE *table=table_ref->table;
uint cnt= table_ref->shared;
List<Item> temp_fields= *fields_for_table[cnt];
ORDER group;
if (table == main_table) // First table in join
{
if (safe_update_on_fly(join->join_tab, &temp_fields))
{
table_to_update= main_table; // Update table on the fly
continue;
}
}
TMP_TABLE_PARAM *tmp_param= tmp_table_param+cnt;
/*
Create a temporary table to store all fields that are changed for this
table. The first field in the temporary table is a pointer to the
original row so that we can find and update it
*/
/* ok to be on stack as this is not referenced outside of this func */
Field_string offset(table->file->ref_length, 0, "offset",
table, &my_charset_bin);
if (temp_fields.push_front(new Item_field(((Field *) &offset))))
DBUG_RETURN(1);
/* Make an unique key over the first field to avoid duplicated updates */
bzero((char*) &group, sizeof(group));
group.asc= 1;
group.item= (Item**) temp_fields.head_ref();
tmp_param->quick_group=1;
tmp_param->field_count=temp_fields.elements;
tmp_param->group_parts=1;
tmp_param->group_length= table->file->ref_length;
if (!(tmp_tables[cnt]=create_tmp_table(thd,
tmp_param,
temp_fields,
(ORDER*) &group, 0, 0,
TMP_TABLE_ALL_COLUMNS,
HA_POS_ERROR)))
DBUG_RETURN(1);
tmp_tables[cnt]->file->extra(HA_EXTRA_WRITE_CACHE);
}
DBUG_RETURN(0);
}
/*
Check if table is safe to update on fly
SYNOPSIS
safe_update_on_fly
join_tab How table is used in join
fields Fields that are updated
NOTES
We can update the first table in join on the fly if we know that
a row in this tabel will never be read twice. This is true under
the folloing conditions:
- We are doing a table scan and the data is in a separate file (MyISAM) or
if we don't update a clustered key.
- We are doing a range scan and we don't update the scan key or
the primary key for a clustered table handler.
WARNING
This code is a bit dependent of how make_join_readinfo() works.
RETURN
0 Not safe to update
1 Safe to update
*/
static bool safe_update_on_fly(JOIN_TAB *join_tab, List<Item> *fields)
{
TABLE *table= join_tab->table;
switch (join_tab->type) {
case JT_SYSTEM:
case JT_CONST:
case JT_EQ_REF:
return 1; // At most one matching row
case JT_REF:
return !check_if_key_used(table, join_tab->ref.key, *fields);
case JT_ALL:
/* If range search on index */
if (join_tab->quick)
return !check_if_key_used(table, join_tab->quick->index,
*fields);
/* If scanning in clustered key */
if ((table->file->table_flags() & HA_PRIMARY_KEY_IN_READ_INDEX) &&
table->primary_key < MAX_KEY)
return !check_if_key_used(table, table->primary_key, *fields);
return 1;
default:
break; // Avoid compler warning
}
return 0;
}
multi_update::~multi_update()
{
TABLE_LIST *table;
for (table= update_tables ; table; table= table->next)
table->table->no_keyread=0;
if (tmp_tables)
{
for (uint cnt = 0; cnt < table_count; cnt++)
{
if (tmp_tables[cnt])
{
free_tmp_table(thd, tmp_tables[cnt]);
tmp_table_param[cnt].cleanup();
}
}
}
if (copy_field)
delete [] copy_field;
thd->count_cuted_fields=0; // Restore this setting
if (!trans_safe)
thd->options|=OPTION_STATUS_NO_TRANS_UPDATE;
}
bool multi_update::send_data(List<Item> &not_used_values)
{
TABLE_LIST *cur_table;
DBUG_ENTER("multi_update::send_data");
for (cur_table= update_tables; cur_table ; cur_table= cur_table->next)
{
TABLE *table= cur_table->table;
/*
Check if we are using outer join and we didn't find the row
or if we have already updated this row in the previous call to this
function.
The same row may be presented here several times in a join of type
UPDATE t1 FROM t1,t2 SET t1.a=t2.a
In this case we will do the update for the first found row combination.
The join algorithm guarantees that we will not find the a row in
t1 several times.
*/
if (table->status & (STATUS_NULL_ROW | STATUS_UPDATED))
continue;
uint offset= cur_table->shared;
table->file->position(table->record[0]);
if (table == table_to_update)
{
table->status|= STATUS_UPDATED;
store_record(table,1);
if (fill_record(*fields_for_table[offset], *values_for_table[offset]))
DBUG_RETURN(1);
found++;
if (compare_record(table, thd->query_id))
{
int error;
if (!updated++)
{
/*
Inform the main table that we are going to update the table even
while we may be scanning it. This will flush the read cache
if it's used.
*/
main_table->file->extra(HA_EXTRA_PREPARE_FOR_UPDATE);
}
if ((error=table->file->update_row(table->record[1],
table->record[0])))
{
table->file->print_error(error,MYF(0));
updated--;
DBUG_RETURN(1);
}
}
}
else
{
int error;
TABLE *tmp_table= tmp_tables[offset];
fill_record(tmp_table->field+1, *values_for_table[offset]);
found++;
/* Store pointer to row */
memcpy((char*) tmp_table->field[0]->ptr,
(char*) table->file->ref, table->file->ref_length);
/* Write row, ignoring duplicated updates to a row */
if ((error= tmp_table->file->write_row(tmp_table->record[0])) &&
(error != HA_ERR_FOUND_DUPP_KEY &&
error != HA_ERR_FOUND_DUPP_UNIQUE))
{
if (create_myisam_from_heap(thd, table, tmp_table_param + offset,
error, 1))
{
do_update=0;
DBUG_RETURN(1); // Not a table_is_full error
}
}
}
}
DBUG_RETURN(0);
}
void multi_update::send_error(uint errcode,const char *err)
{
/* First send error what ever it is ... */
::send_error(thd,errcode,err);
/* If nothing updated return */
if (!updated)
return;
/* Something already updated so we have to invalidate cache */
query_cache_invalidate3(thd, update_tables, 1);
/*
If all tables that has been updated are trans safe then just do rollback.
If not attempt to do remaining updates.
*/
if (trans_safe)
ha_rollback_stmt(thd);
else if (do_update && table_count > 1)
{
/* Add warning here */
VOID(do_updates(0));
}
}
int multi_update::do_updates(bool from_send_error)
{
TABLE_LIST *cur_table;
int local_error;
ha_rows org_updated;
TABLE *table;
DBUG_ENTER("do_updates");
do_update= 0; // Don't retry this function
for (cur_table= update_tables; cur_table ; cur_table= cur_table->next)
{
table = cur_table->table;
if (table == table_to_update)
continue; // Already updated
org_updated= updated;
byte *ref_pos;
TABLE *tmp_table= tmp_tables[cur_table->shared];
tmp_table->file->extra(HA_EXTRA_CACHE); // Change to read cache
table->file->extra(HA_EXTRA_NO_CACHE);
/*
Setup copy functions to copy fields from temporary table
*/
List_iterator_fast<Item> field_it(*fields_for_table[cur_table->shared]);
Field **field= tmp_table->field+1; // Skip row pointer
Copy_field *copy_field_ptr= copy_field, *copy_field_end;
for ( ; *field ; field++)
{
Item_field *item= (Item_field* ) field_it++;
(copy_field_ptr++)->set(item->field, *field, 0);
}
copy_field_end=copy_field_ptr;
if ((local_error = tmp_table->file->rnd_init(1)))
goto err;
ref_pos= (byte*) tmp_table->field[0]->ptr;
for (;;)
{
if (thd->killed && trans_safe)
goto err;
if ((local_error=tmp_table->file->rnd_next(tmp_table->record[0])))
{
if (local_error == HA_ERR_END_OF_FILE)
break;
if (local_error == HA_ERR_RECORD_DELETED)
continue; // May happen on dup key
goto err;
}
if ((local_error= table->file->rnd_pos(table->record[0], ref_pos)))
goto err;
table->status|= STATUS_UPDATED;
store_record(table,1);
/* Copy data from temporary table to current table */
for (copy_field_ptr=copy_field;
copy_field_ptr != copy_field_end;
copy_field_ptr++)
(*copy_field_ptr->do_copy)(copy_field_ptr);
if (compare_record(table, thd->query_id))
{
if ((local_error=table->file->update_row(table->record[1],
table->record[0])))
{
if (local_error != HA_ERR_FOUND_DUPP_KEY ||
handle_duplicates != DUP_IGNORE)
goto err;
}
updated++;
if (table->tmp_table != NO_TMP_TABLE)
log_delayed= 1;
}
}
if (updated != org_updated)
{
if (table->tmp_table != NO_TMP_TABLE)
log_delayed= 1; // Tmp tables forces delay log
if (table->file->has_transactions())
log_delayed= transactional_tables= 1;
else
trans_safe= 0; // Can't do safe rollback
}
}
DBUG_RETURN(0);
err:
if (!from_send_error)
table->file->print_error(local_error,MYF(0));
if (updated != org_updated)
{
if (table->tmp_table != NO_TMP_TABLE)
log_delayed= 1;
if (table->file->has_transactions())
log_delayed= transactional_tables= 1;
else
trans_safe= 0;
}
DBUG_RETURN(1);
}
/* out: 1 if error, 0 if success */
bool multi_update::send_eof()
{
char buff[80];
thd->proc_info="updating reference tables";
/* Does updates for the last n - 1 tables, returns 0 if ok */
int local_error = (table_count) ? do_updates(0) : 0;
thd->proc_info= "end";
/*
Write the SQL statement to the binlog if we updated
rows and we succeeded or if we updated some non
transacational tables
*/
if (updated && (local_error <= 0 || !trans_safe))
{
mysql_update_log.write(thd,thd->query,thd->query_length);
if (mysql_bin_log.is_open())
{
Query_log_event qinfo(thd, thd->query, thd->query_length,
log_delayed);
if (mysql_bin_log.write(&qinfo) && trans_safe)
local_error= 1; // Rollback update
}
if (!log_delayed)
thd->options|=OPTION_STATUS_NO_TRANS_UPDATE;
}
if (transactional_tables)
{
if (ha_autocommit_or_rollback(thd, local_error != 0))
local_error=1;
}
if (local_error > 0) // if the above log write did not fail ...
{
/* Safety: If we haven't got an error before (should not happen) */
my_message(ER_UNKNOWN_ERROR, "An error occured in multi-table update",
MYF(0));
::send_error(thd);
return 1;
}
sprintf(buff,ER(ER_UPDATE_INFO), (long) found, (long) updated,
(long) thd->cuted_fields);
if (updated)
{
query_cache_invalidate3(thd, update_tables, 1);
}
::send_ok(thd,
(thd->client_capabilities & CLIENT_FOUND_ROWS) ? found : updated,
thd->insert_id_used ? thd->insert_id() : 0L,buff);
return 0;
}
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