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mariadb/sql/sql_delete.cc
unknown 2a0d2fef51 Bug#12713 "Error in a stored function called from a SELECT doesn't 
cause ROLLBACK of statement", part 1. Review fixes.

Do not send OK/EOF packets to the client until we reached the end of 
the current statement.
This is a consolidation, to keep the functionality that is shared by all 
SQL statements in one place in the server.
Currently this functionality includes:
- close_thread_tables()
- log_slow_statement().

After this patch and the subsequent patch for Bug#12713, it shall also include:
- ha_autocommit_or_rollback()
- net_end_statement()
- query_cache_end_of_result().

In future it may also include:
- mysql_reset_thd_for_next_command().


include/mysql_com.h:
  Rename now unused members of NET: no_send_ok, no_send_error, report_error.
  These were server-specific variables related to the client/server
  protocol. They have been made obsolete by this patch.
  
  Previously the same members of NET were used to store the error message
  both on the client and on the server. 
  The error message was stored in net.last_error (client: mysql->net.last_error,
  server: thd->net.last_error).
  The error code was stored in net.last_errno (client: mysql->net.last_errno,
  server: thd->net.last_errno).
  The server error code and message are now stored elsewhere 
  (in the Diagnostics_area), thus NET members are no longer used by the
  server.
  Rename last_error to client_last_error, last_errno to client_last_errno
  to avoid potential bugs introduced by merges.
include/mysql_h.ic:
  Update the ABI file to reflect a rename. 
  Renames do not break the binary compatibility.
libmysql/libmysql.c:
  Rename last_error to client_last_error, last_errno to client_last_errno.
  This is necessary to ensure no unnoticed bugs introduced by merged
  changesets.
  
  Remove net.report_error, net.no_send_ok, net.no_send_error.
libmysql/manager.c:
  Rename net.last_errno to net.client_last_errno.
libmysqld/lib_sql.cc:
  Rename net.last_errno to net.client_last_errno.
  
  Update the embedded implementation of the client-server protocol to
  reflect the refactoring of protocol.cc.
libmysqld/libmysqld.c:
  Rename net.last_errno to net.client_last_errno.
mysql-test/r/events.result:
  Update to reflect the change in mysql_rm_db(). Now we drop stored
  routines and events for a given database name only if there
  is a directory for this database name. ha_drop_database() and
  query_cache_invalidate() are called likewise. 
  Previously we would attempt to drop routines/events even if database
  directory was not found (it worked, since routines and events are stored
  in tables). This fixes Bug 29958 "Weird message on DROP DATABASE if mysql.proc
  does not exist".
  The change was done because the previous code used to call send_ok()
  twice, which led to an assertion failure when asserts against it were
  added by this patch.
mysql-test/r/grant.result:
  Fix the patch for Bug 16470, now FLUSH PRIVILEGES produces an error 
  if mysql.procs_priv is missing.
  This fixes the assert that send_ok() must not called after send_error()
  (the original patch for Bug 16470 was prone to this).
mysql-test/suite/rpl/r/rpl_row_tabledefs_2myisam.result:
  Produce a more detailed error message.
mysql-test/suite/rpl/r/rpl_row_tabledefs_3innodb.result:
  Produce a more detailed error message.
mysql-test/t/grant.test:
  Update the test, now FLUSH PRIVILEGES returns an error if mysql.procs_priv
  is missing.
server-tools/instance-manager/mysql_connection.cc:
  Rename net.last_errno to net.client_last_errno.
sql/ha_ndbcluster_binlog.cc:
  Add asserts. 
  
  Use getters to access statement status information.
  
  Add a comment why run_query() is broken. Reset the diagnostics area
  in the end of run_query() to fulfill the invariant that the diagnostics_area
  is never assigned twice per statement (see the comment in the code
  when this can happen). We still do not clear thd->is_fatal_error and
  thd->is_slave_error, which may lead to bugs, I consider the whole affair
  as something to be dealt with separately.
sql/ha_partition.cc:
  fatal_error() doesn't set an error by itself. Perhaps we should
  remove this method altogether and instead add a flag to my_error 
  to set thd->is_fatal_error property.
  
  Meanwhile, this change is a part of inspection made to the entire source
  code with the goal to ensure that fatal_error()
  is always accompanied by my_error().
sql/item_func.cc:
  There is no net.last_error anymore. Remove the obsolete assignment.
sql/log_event.cc:
  Use getters to access statement error status information.
sql/log_event_old.cc:
  Use getters to access statement error status information.
sql/mysqld.cc:
  Previously, if a continue handler for an error was found, my_message_sql() 
  would not set an error in THD. Since the current statement
  must be aborted in any case, find_handler() had a hack to assign 
  thd->net.report_error to 1.
  
  Remove this hack. Set an error in my_message_sql() even if the continue
  handler is found. The error will be cleared anyway when the handler
  is executed. This is one action among many in this patch to ensure the 
  invariant that whenever thd->is_error() is TRUE, we have a message in 
  thd->main_da.message().
sql/net_serv.cc:
  Use a full-blown my_error() in net_serv.cc to report an error,
  instead of just setting net->last_errno. This ensures the invariant that
  whenever thd->is_error() returns TRUE, we have a message in 
  thd->main_da.message().
  
  Remove initialization of removed NET members.
sql/opt_range.cc:
  Use my_error() instead of just raising thd->net.report_error. 
  This ensures the invariant that whenever thd->is_error() returns TRUE, 
  there is a message in thd->main_da.message().
sql/opt_sum.cc:
  Move invocation of fatal_error() right next to the place where
  we set the error message. That makes it easier to track that whenever
  fatal_error() is called, there is a message in THD.
sql/protocol.cc:
  Rename send_ok() and send_eof() to net_send_ok() and net_send_eof() 
  respectively. These functions write directly to the network and are not 
  for use anywhere outside the client/server protocol code. 
  
  Remove the code that was responsible for cases when either there is 
  no error code, or no error message, or both.
  Instead the calling code ensures that they are always present. Asserts
  are added to enforce the invariant.
  
  Instead of a direct access to thd->server_status and thd->total_warn_count
  use function parameters, since these from now on don't always come directly
  from THD.
  
  Introduce net_end_statement(), the single-entry-point replacement API for 
  send_ok(), send_eof() and net_send_error().
  
  Implement Protocol::end_partial_result_set to use in select_send::abort()
  when there is a continue handler.
sql/protocol.h:
  Update declarations.
sql/repl_failsafe.cc:
  Use getters to access statement status information in THD.
  Rename net.last_error to net.client_last_error.
sql/rpl_record.cc:
  Set an error message in prepare_record() if there is no default
  value for the field -- later we do print this message to the client.
sql/rpl_rli.cc:
  Use getters to access statement status information in THD.
sql/slave.cc:
  In create_table_from_dump() (a common function that is used in 
  LOAD MASTER TABLE SQL statement and COM_LOAD_MASTER_DATA), instead of hacks
  with no_send_ok, clear the diagnostics area when mysql_rm_table() succeeded.
  
  Update has_temporary_error() to work correctly when no error is set.
  This is the case when Incident_log_event is executed: it always returns
  an error but does not set an error message.
  
  Use getters to access error status information.
sql/sp_head.cc:
  Instead of hacks with no_send_error, work through the diagnostics area 
  interface to suppress sending of OK/ERROR packets to the client.
  
  Move query_cache_end_of_result before log_slow_statement(), similarly
  to how it's done in dispatch_command().
sql/sp_rcontext.cc:
  Remove hacks with assignment of thd->net.report_error, they are not
  necessary any more (see the changes in mysqld.cc).
sql/sql_acl.cc:
  Use getters to access error status information in THD.
sql/sql_base.cc:
  Access thd->main_da.sql_errno() only if there is an error. This fixes
  a bug when auto-discovery, that was effectively disabled under pre-locking.
sql/sql_binlog.cc:
  Remove hacks with no_send_ok/no_send_error, they are not necessary 
  anymore: the caller is responsible for network communication.
sql/sql_cache.cc:
  Disable sending of OK/ERROR/EOF packet in the end of dispatch_command
  if the response has been served from the query cache. This raises the 
  question whether we should store EOF packet in the query cache at all,
  or generate it anew for each statement (we should generate it anew), but
  this is to be addressed separately.
sql/sql_class.cc:
  Implement class Diagnostics_area. Please see comments in sql_class.h
  for details.
  
  Fix a subtle coding mistake in select_send::send_data: when on slave, 
  an error in Item::send() was ignored.
  The problem became visible due to asserts that the diagnostics area is
  never double assigned.
  
  Remove initialization of removed NET members.
  
  In select_send::abort() do not call select_send::send_eof(). This is
  not inheritance-safe. Even if a stored procedure continue handler is
  found, the current statement is aborted, not succeeded.
  Instead introduce a Protocol API to send the required response, 
  Protocol::end_partial_result_set().
  
  This simplifies implementation of select_send::send_eof(). No need
  to add more asserts that there is no error, there is an assert inside
  Diagnostics_area::set_ok_status() already.
  
  Leave no trace of no_send_* in the code.
sql/sql_class.h:
  Declare class Diagnostics_area. 
  
  Remove the hack with no_send_ok from
  Substatement_state.
  
  Provide inline implementations of send_ok/send_eof.
  
  Add commetns.
sql/sql_connect.cc:
  Remove hacks with no_send_error. 
  
  Since now an error in THD is always set if net->error, it's not necessary
  to check both net->error and thd->is_error() in the do_command loop.
  
  Use thd->main_da.message() instead of net->last_errno.
  
  Remove the hack with is_slave_error in sys_init_connect. Since now we do not
  reset the diagnostics area in net_send_error (it's reset at the beginning
  of the next statement), we can access it safely even after 
  execute_init_command.
sql/sql_db.cc:
  Update the code to satisfy the invariant that the diagnostics area is never
  assigned twice.
  Incidentally, this fixes Bug 29958 "Weird message on DROP DATABASE if 
  mysql.proc does not exist".
sql/sql_delete.cc:
  Change multi-delete to abort in abort(), as per select_send protocol.
  Fixes the merge error with the test for Bug 29136
sql/sql_derived.cc:
  Use getters to access error information.
sql/sql_insert.cc:
  Use getters to access error information.
sql-common/client.c:
  Rename last_error to client_last_error, last_errno to client_last_errno.
sql/sql_parse.cc:
  Remove hacks with no_send_error. Deploy net_end_statement().
  
  The story of COM_SHUTDOWN is interesting. Long story short, the server 
  would become on its death's door, and only no_send_ok/no_send_error assigned
  by send_ok()/net_send_error() would hide its babbling from the client.
  
  First of all, COM_QUIT does not require a response. So, the comment saying
  "Let's send a response to possible COM_QUIT" is not only groundless 
  (even mysqladmin shutdown/mysql_shutdown() doesn't send COM_QUIT after 
  COM_SHUTDOWN), it's plainly incorrect.
  
  Secondly, besides this additional 'OK' packet to respond to a hypothetical
  COM_QUIT, there was the following code in dispatch_command():
  
  if (thd->killed)
    thd->send_kill_message();
  if (thd->is_error()
    net_send_error(thd);
  
  This worked out really funny for the thread through which COM_SHUTDOWN
  was delivered: we would get COM_SHUTDOWN, say okay, say okay again, 
  kill everybody, get the kill signal ourselves, and then attempt to say 
  "Server shutdown in progress" to the client that is very likely long gone.
  
  This all became visible when asserts were added that the Diagnostics_area
  is not assigned twice.
  
  Move query_cache_end_of_result() to the end of dispatch_command(), since
  net_send_eof() has been moved there. This is safe, query_cache_end_of_result()
  is a no-op if there is no started query in the cache.
  
  Consistently use select_send interface to call abort() or send_eof()
  depending on the operation result.
  
  Remove thd->fatal_error() from reset_master(), it was a no-op. 
  in hacks with no_send_error woudl save us
  from complete breakage of the client/server protocol.
  
  Consistently use select_send::abort() whenever there is an error, 
  and select_send::send_eof() in case of success.
  The issue became visible due to added asserts.
sql/sql_partition.cc:
  Always set an error in THD whenever there is a call to fatal_error().
sql/sql_prepare.cc:
  Deploy class Diagnostics_area.
  Remove the unnecessary juggling with the protocol in 
  Select_fetch_protocol_binary::send_eof(). EOF packet format is 
  protocol-independent.
sql/sql_select.cc:
  Call fatal_error() directly in opt_sum_query.
  Call my_error() whenever we call thd->fatal_error().
sql/sql_servers.cc:
  Use getters to access error information in THD.
sql/sql_show.cc:
  Use getters to access error information in THD.
  
  Add comments.
  
  Call my_error() whenever we call fatal_error().
sql/sql_table.cc:
  Replace hacks with no_send_ok with the interface of the diagnostics area.
  
  Clear the error if ENOENT error in ha_delete_table().
sql/sql_update.cc:
  Introduce multi_update::abort(), which is the proper way to abort a
  multi-update. This fixes the merge conflict between this patch and
  the patch for Bug 29136.
sql/table.cc:
  Use a getter to access error information in THD.
sql/tztime.cc:
  Use a getter to access error information in THD.
2007-12-12 18:21:01 +03:00

1061 lines
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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; version 2 of the License.
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 */
/*
Delete of records and truncate of tables.
Multi-table deletes were introduced by Monty and Sinisa
*/
#include "mysql_priv.h"
#include "sql_select.h"
#include "sp_head.h"
#include "sql_trigger.h"
bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
SQL_LIST *order, ha_rows limit, ulonglong options,
bool reset_auto_increment)
{
bool will_batch;
int error, loc_error;
TABLE *table;
SQL_SELECT *select=0;
READ_RECORD info;
bool using_limit=limit != HA_POS_ERROR;
bool transactional_table, safe_update, const_cond;
bool const_cond_result;
ha_rows deleted= 0;
uint usable_index= MAX_KEY;
SELECT_LEX *select_lex= &thd->lex->select_lex;
THD::killed_state killed_status= THD::NOT_KILLED;
DBUG_ENTER("mysql_delete");
if (open_and_lock_tables(thd, table_list))
DBUG_RETURN(TRUE);
if (!(table= table_list->table))
{
my_error(ER_VIEW_DELETE_MERGE_VIEW, MYF(0),
table_list->view_db.str, table_list->view_name.str);
DBUG_RETURN(TRUE);
}
thd->proc_info="init";
table->map=1;
if (mysql_prepare_delete(thd, table_list, &conds))
DBUG_RETURN(TRUE);
/* check ORDER BY even if it can be ignored */
if (order && order->elements)
{
TABLE_LIST tables;
List<Item> fields;
List<Item> all_fields;
bzero((char*) &tables,sizeof(tables));
tables.table = table;
tables.alias = table_list->alias;
if (select_lex->setup_ref_array(thd, order->elements) ||
setup_order(thd, select_lex->ref_pointer_array, &tables,
fields, all_fields, (ORDER*) order->first))
{
delete select;
free_underlaid_joins(thd, &thd->lex->select_lex);
DBUG_RETURN(TRUE);
}
}
const_cond= (!conds || conds->const_item());
safe_update=test(thd->options & OPTION_SAFE_UPDATES);
if (safe_update && const_cond)
{
my_message(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE,
ER(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE), MYF(0));
DBUG_RETURN(TRUE);
}
select_lex->no_error= thd->lex->ignore;
const_cond_result= const_cond && (!conds || conds->val_int());
if (thd->is_error())
{
/* Error evaluating val_int(). */
DBUG_RETURN(TRUE);
}
/*
Test if the user wants to delete all rows and deletion doesn't have
any side-effects (because of triggers), so we can use optimized
handler::delete_all_rows() method.
We implement fast TRUNCATE for InnoDB even if triggers are
present. TRUNCATE ignores triggers.
We can use delete_all_rows() if and only if:
- We allow new functions (not using option --skip-new), and are
not in safe mode (not using option --safe-mode)
- There is no limit clause
- The condition is constant
- If there is a condition, then it it produces a non-zero value
- If the current command is DELETE FROM with no where clause
(i.e., not TRUNCATE) then:
- We should not be binlogging this statement row-based, and
- there should be no delete triggers associated with the table.
*/
if (!using_limit && const_cond_result &&
!(specialflag & (SPECIAL_NO_NEW_FUNC | SPECIAL_SAFE_MODE)) &&
(thd->lex->sql_command == SQLCOM_TRUNCATE ||
(!thd->current_stmt_binlog_row_based &&
!(table->triggers && table->triggers->has_delete_triggers()))))
{
/* Update the table->file->stats.records number */
table->file->info(HA_STATUS_VARIABLE | HA_STATUS_NO_LOCK);
ha_rows const maybe_deleted= table->file->stats.records;
DBUG_PRINT("debug", ("Trying to use delete_all_rows()"));
if (!(error=table->file->delete_all_rows()))
{
error= -1; // ok
deleted= maybe_deleted;
goto cleanup;
}
if (error != HA_ERR_WRONG_COMMAND)
{
table->file->print_error(error,MYF(0));
error=0;
goto cleanup;
}
/* Handler didn't support fast delete; Delete rows one by one */
}
if (conds)
{
Item::cond_result result;
conds= remove_eq_conds(thd, conds, &result);
if (result == Item::COND_FALSE) // Impossible where
limit= 0;
}
#ifdef WITH_PARTITION_STORAGE_ENGINE
if (prune_partitions(thd, table, conds))
{
free_underlaid_joins(thd, select_lex);
thd->row_count_func= 0;
send_ok(thd, (ha_rows) thd->row_count_func); // No matching records
DBUG_RETURN(0);
}
#endif
/* Update the table->file->stats.records number */
table->file->info(HA_STATUS_VARIABLE | HA_STATUS_NO_LOCK);
table->covering_keys.clear_all();
table->quick_keys.clear_all(); // Can't use 'only index'
select=make_select(table, 0, 0, conds, 0, &error);
if (error)
DBUG_RETURN(TRUE);
if ((select && select->check_quick(thd, safe_update, limit)) || !limit)
{
delete select;
free_underlaid_joins(thd, select_lex);
thd->row_count_func= 0;
send_ok(thd, (ha_rows) thd->row_count_func);
/*
We don't need to call reset_auto_increment in this case, because
mysql_truncate always gives a NULL conds argument, hence we never
get here.
*/
DBUG_RETURN(0); // Nothing to delete
}
/* If running in safe sql mode, don't allow updates without keys */
if (table->quick_keys.is_clear_all())
{
thd->server_status|=SERVER_QUERY_NO_INDEX_USED;
if (safe_update && !using_limit)
{
delete select;
free_underlaid_joins(thd, select_lex);
my_message(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE,
ER(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE), MYF(0));
DBUG_RETURN(TRUE);
}
}
if (options & OPTION_QUICK)
(void) table->file->extra(HA_EXTRA_QUICK);
if (order && order->elements)
{
uint length= 0;
SORT_FIELD *sortorder;
ha_rows examined_rows;
if ((!select || table->quick_keys.is_clear_all()) && limit != HA_POS_ERROR)
usable_index= get_index_for_order(table, (ORDER*)(order->first), limit);
if (usable_index == MAX_KEY)
{
table->sort.io_cache= (IO_CACHE *) my_malloc(sizeof(IO_CACHE),
MYF(MY_FAE | MY_ZEROFILL));
if (!(sortorder= make_unireg_sortorder((ORDER*) order->first,
&length, NULL)) ||
(table->sort.found_records = filesort(thd, table, sortorder, length,
select, HA_POS_ERROR, 1,
&examined_rows))
== HA_POS_ERROR)
{
delete select;
free_underlaid_joins(thd, &thd->lex->select_lex);
DBUG_RETURN(TRUE);
}
/*
Filesort has already found and selected the rows we want to delete,
so we don't need the where clause
*/
delete select;
free_underlaid_joins(thd, select_lex);
select= 0;
}
}
/* If quick select is used, initialize it before retrieving rows. */
if (select && select->quick && select->quick->reset())
{
delete select;
free_underlaid_joins(thd, select_lex);
DBUG_RETURN(TRUE);
}
if (usable_index==MAX_KEY)
init_read_record(&info,thd,table,select,1,1);
else
init_read_record_idx(&info, thd, table, 1, usable_index);
init_ftfuncs(thd, select_lex, 1);
thd->proc_info="updating";
if (table->triggers &&
table->triggers->has_triggers(TRG_EVENT_DELETE,
TRG_ACTION_AFTER))
{
/*
The table has AFTER DELETE triggers that might access to subject table
and therefore might need delete to be done immediately. So we turn-off
the batching.
*/
(void) table->file->extra(HA_EXTRA_DELETE_CANNOT_BATCH);
will_batch= FALSE;
}
else
will_batch= !table->file->start_bulk_delete();
table->mark_columns_needed_for_delete();
while (!(error=info.read_record(&info)) && !thd->killed &&
! thd->is_error())
{
// thd->is_error() is tested to disallow delete row on error
if (!(select && select->skip_record())&& ! thd->is_error() )
{
if (table->triggers &&
table->triggers->process_triggers(thd, TRG_EVENT_DELETE,
TRG_ACTION_BEFORE, FALSE))
{
error= 1;
break;
}
if (!(error= table->file->ha_delete_row(table->record[0])))
{
deleted++;
if (table->triggers &&
table->triggers->process_triggers(thd, TRG_EVENT_DELETE,
TRG_ACTION_AFTER, FALSE))
{
error= 1;
break;
}
if (!--limit && using_limit)
{
error= -1;
break;
}
}
else
{
table->file->print_error(error,MYF(0));
/*
In < 4.0.14 we set the error number to 0 here, but that
was not sensible, because then MySQL would not roll back the
failed DELETE, and also wrote it to the binlog. For MyISAM
tables a DELETE probably never should fail (?), but for
InnoDB it can fail in a FOREIGN KEY error or an
out-of-tablespace error.
*/
error= 1;
break;
}
}
else
table->file->unlock_row(); // Row failed selection, release lock on it
}
killed_status= thd->killed;
if (killed_status != THD::NOT_KILLED || thd->is_error())
error= 1; // Aborted
if (will_batch && (loc_error= table->file->end_bulk_delete()))
{
if (error != 1)
table->file->print_error(loc_error,MYF(0));
error=1;
}
thd->proc_info= "end";
end_read_record(&info);
if (options & OPTION_QUICK)
(void) table->file->extra(HA_EXTRA_NORMAL);
if (reset_auto_increment && (error < 0))
{
/*
We're really doing a truncate and need to reset the table's
auto-increment counter.
*/
int error2= table->file->reset_auto_increment(0);
if (error2 && (error2 != HA_ERR_WRONG_COMMAND))
{
table->file->print_error(error2, MYF(0));
error= 1;
}
}
cleanup:
/*
Invalidate the table in the query cache if something changed. This must
be before binlog writing and ha_autocommit_...
*/
if (deleted)
{
query_cache_invalidate3(thd, table_list, 1);
}
delete select;
transactional_table= table->file->has_transactions();
if (!transactional_table && deleted > 0)
thd->transaction.stmt.modified_non_trans_table= TRUE;
/* See similar binlogging code in sql_update.cc, for comments */
if ((error < 0) || thd->transaction.stmt.modified_non_trans_table)
{
if (mysql_bin_log.is_open())
{
if (error < 0)
thd->clear_error();
/*
[binlog]: If 'handler::delete_all_rows()' was called and the
storage engine does not inject the rows itself, we replicate
statement-based; otherwise, 'ha_delete_row()' was used to
delete specific rows which we might log row-based.
*/
int log_result= thd->binlog_query(THD::ROW_QUERY_TYPE,
thd->query, thd->query_length,
transactional_table, FALSE, killed_status);
if (log_result && transactional_table)
{
error=1;
}
}
if (thd->transaction.stmt.modified_non_trans_table)
thd->transaction.all.modified_non_trans_table= TRUE;
}
DBUG_ASSERT(transactional_table || !deleted || thd->transaction.stmt.modified_non_trans_table);
free_underlaid_joins(thd, select_lex);
if (transactional_table)
{
if (ha_autocommit_or_rollback(thd,error >= 0))
error=1;
}
if (thd->lock)
{
mysql_unlock_tables(thd, thd->lock);
thd->lock=0;
}
if (error < 0 || (thd->lex->ignore && !thd->is_fatal_error))
{
thd->row_count_func= deleted;
send_ok(thd, (ha_rows) thd->row_count_func);
DBUG_PRINT("info",("%ld records deleted",(long) deleted));
}
DBUG_RETURN(error >= 0 || thd->is_error());
}
/*
Prepare items in DELETE statement
SYNOPSIS
mysql_prepare_delete()
thd - thread handler
table_list - global/local table list
conds - conditions
RETURN VALUE
FALSE OK
TRUE error
*/
bool mysql_prepare_delete(THD *thd, TABLE_LIST *table_list, Item **conds)
{
Item *fake_conds= 0;
SELECT_LEX *select_lex= &thd->lex->select_lex;
DBUG_ENTER("mysql_prepare_delete");
List<Item> all_fields;
thd->lex->allow_sum_func= 0;
if (setup_tables_and_check_access(thd, &thd->lex->select_lex.context,
&thd->lex->select_lex.top_join_list,
table_list,
&select_lex->leaf_tables, FALSE,
DELETE_ACL, SELECT_ACL) ||
setup_conds(thd, table_list, select_lex->leaf_tables, conds) ||
setup_ftfuncs(select_lex))
DBUG_RETURN(TRUE);
if (!table_list->updatable || check_key_in_view(thd, table_list))
{
my_error(ER_NON_UPDATABLE_TABLE, MYF(0), table_list->alias, "DELETE");
DBUG_RETURN(TRUE);
}
{
TABLE_LIST *duplicate;
if ((duplicate= unique_table(thd, table_list, table_list->next_global, 0)))
{
update_non_unique_table_error(table_list, "DELETE", duplicate);
DBUG_RETURN(TRUE);
}
}
if (select_lex->inner_refs_list.elements &&
fix_inner_refs(thd, all_fields, select_lex, select_lex->ref_pointer_array))
DBUG_RETURN(-1);
select_lex->fix_prepare_information(thd, conds, &fake_conds);
DBUG_RETURN(FALSE);
}
/***************************************************************************
Delete multiple tables from join
***************************************************************************/
#define MEM_STRIP_BUF_SIZE current_thd->variables.sortbuff_size
extern "C" int refpos_order_cmp(void* arg, const void *a,const void *b)
{
handler *file= (handler*)arg;
return file->cmp_ref((const uchar*)a, (const uchar*)b);
}
/*
make delete specific preparation and checks after opening tables
SYNOPSIS
mysql_multi_delete_prepare()
thd thread handler
RETURN
FALSE OK
TRUE Error
*/
bool mysql_multi_delete_prepare(THD *thd)
{
LEX *lex= thd->lex;
TABLE_LIST *aux_tables= (TABLE_LIST *)lex->auxiliary_table_list.first;
TABLE_LIST *target_tbl;
DBUG_ENTER("mysql_multi_delete_prepare");
/*
setup_tables() need for VIEWs. JOIN::prepare() will not do it second
time.
lex->query_tables also point on local list of DELETE SELECT_LEX
*/
if (setup_tables_and_check_access(thd, &thd->lex->select_lex.context,
&thd->lex->select_lex.top_join_list,
lex->query_tables,
&lex->select_lex.leaf_tables, FALSE,
DELETE_ACL, SELECT_ACL))
DBUG_RETURN(TRUE);
/*
Multi-delete can't be constructed over-union => we always have
single SELECT on top and have to check underlying SELECTs of it
*/
lex->select_lex.exclude_from_table_unique_test= TRUE;
/* Fix tables-to-be-deleted-from list to point at opened tables */
for (target_tbl= (TABLE_LIST*) aux_tables;
target_tbl;
target_tbl= target_tbl->next_local)
{
if (!(target_tbl->table= target_tbl->correspondent_table->table))
{
DBUG_ASSERT(target_tbl->correspondent_table->view &&
target_tbl->correspondent_table->merge_underlying_list &&
target_tbl->correspondent_table->merge_underlying_list->
next_local);
my_error(ER_VIEW_DELETE_MERGE_VIEW, MYF(0),
target_tbl->correspondent_table->view_db.str,
target_tbl->correspondent_table->view_name.str);
DBUG_RETURN(TRUE);
}
if (!target_tbl->correspondent_table->updatable ||
check_key_in_view(thd, target_tbl->correspondent_table))
{
my_error(ER_NON_UPDATABLE_TABLE, MYF(0),
target_tbl->table_name, "DELETE");
DBUG_RETURN(TRUE);
}
/*
Check that table from which we delete is not used somewhere
inside subqueries/view.
*/
{
TABLE_LIST *duplicate;
if ((duplicate= unique_table(thd, target_tbl->correspondent_table,
lex->query_tables, 0)))
{
update_non_unique_table_error(target_tbl->correspondent_table,
"DELETE", duplicate);
DBUG_RETURN(TRUE);
}
}
}
DBUG_RETURN(FALSE);
}
multi_delete::multi_delete(TABLE_LIST *dt, uint num_of_tables_arg)
: delete_tables(dt), deleted(0), found(0),
num_of_tables(num_of_tables_arg), error(0),
do_delete(0), transactional_tables(0), normal_tables(0), error_handled(0)
{
tempfiles= (Unique **) sql_calloc(sizeof(Unique *) * num_of_tables);
}
int
multi_delete::prepare(List<Item> &values, SELECT_LEX_UNIT *u)
{
DBUG_ENTER("multi_delete::prepare");
unit= u;
do_delete= 1;
thd->proc_info="deleting from main table";
DBUG_RETURN(0);
}
bool
multi_delete::initialize_tables(JOIN *join)
{
TABLE_LIST *walk;
Unique **tempfiles_ptr;
DBUG_ENTER("initialize_tables");
if ((thd->options & OPTION_SAFE_UPDATES) && error_if_full_join(join))
DBUG_RETURN(1);
table_map tables_to_delete_from=0;
for (walk= delete_tables; walk; walk= walk->next_local)
tables_to_delete_from|= walk->table->map;
walk= delete_tables;
delete_while_scanning= 1;
for (JOIN_TAB *tab=join->join_tab, *end=join->join_tab+join->tables;
tab < end;
tab++)
{
if (tab->table->map & tables_to_delete_from)
{
/* We are going to delete from this table */
TABLE *tbl=walk->table=tab->table;
walk= walk->next_local;
/* Don't use KEYREAD optimization on this table */
tbl->no_keyread=1;
/* Don't use record cache */
tbl->no_cache= 1;
tbl->covering_keys.clear_all();
if (tbl->file->has_transactions())
transactional_tables= 1;
else
normal_tables= 1;
if (tbl->triggers &&
tbl->triggers->has_triggers(TRG_EVENT_DELETE,
TRG_ACTION_AFTER))
{
/*
The table has AFTER DELETE triggers that might access to subject
table and therefore might need delete to be done immediately.
So we turn-off the batching.
*/
(void) tbl->file->extra(HA_EXTRA_DELETE_CANNOT_BATCH);
}
tbl->prepare_for_position();
tbl->mark_columns_needed_for_delete();
}
else if ((tab->type != JT_SYSTEM && tab->type != JT_CONST) &&
walk == delete_tables)
{
/*
We are not deleting from the table we are scanning. In this
case send_data() shouldn't delete any rows a we may touch
the rows in the deleted table many times
*/
delete_while_scanning= 0;
}
}
walk= delete_tables;
tempfiles_ptr= tempfiles;
if (delete_while_scanning)
{
table_being_deleted= delete_tables;
walk= walk->next_local;
}
for (;walk ;walk= walk->next_local)
{
TABLE *table=walk->table;
*tempfiles_ptr++= new Unique (refpos_order_cmp,
(void *) table->file,
table->file->ref_length,
MEM_STRIP_BUF_SIZE);
}
init_ftfuncs(thd, thd->lex->current_select, 1);
DBUG_RETURN(thd->is_fatal_error != 0);
}
multi_delete::~multi_delete()
{
for (table_being_deleted= delete_tables;
table_being_deleted;
table_being_deleted= table_being_deleted->next_local)
{
TABLE *table= table_being_deleted->table;
table->no_keyread=0;
}
for (uint counter= 0; counter < num_of_tables; counter++)
{
if (tempfiles[counter])
delete tempfiles[counter];
}
}
bool multi_delete::send_data(List<Item> &values)
{
int secure_counter= delete_while_scanning ? -1 : 0;
TABLE_LIST *del_table;
DBUG_ENTER("multi_delete::send_data");
for (del_table= delete_tables;
del_table;
del_table= del_table->next_local, secure_counter++)
{
TABLE *table= del_table->table;
/* Check if we are using outer join and we didn't find the row */
if (table->status & (STATUS_NULL_ROW | STATUS_DELETED))
continue;
table->file->position(table->record[0]);
found++;
if (secure_counter < 0)
{
/* We are scanning the current table */
DBUG_ASSERT(del_table == table_being_deleted);
if (table->triggers &&
table->triggers->process_triggers(thd, TRG_EVENT_DELETE,
TRG_ACTION_BEFORE, FALSE))
DBUG_RETURN(1);
table->status|= STATUS_DELETED;
if (!(error=table->file->ha_delete_row(table->record[0])))
{
deleted++;
if (!table->file->has_transactions())
thd->transaction.stmt.modified_non_trans_table= TRUE;
if (table->triggers &&
table->triggers->process_triggers(thd, TRG_EVENT_DELETE,
TRG_ACTION_AFTER, FALSE))
DBUG_RETURN(1);
}
else
{
table->file->print_error(error,MYF(0));
DBUG_RETURN(1);
}
}
else
{
error=tempfiles[secure_counter]->unique_add((char*) table->file->ref);
if (error)
{
error= 1; // Fatal error
DBUG_RETURN(1);
}
}
}
DBUG_RETURN(0);
}
void multi_delete::send_error(uint errcode,const char *err)
{
DBUG_ENTER("multi_delete::send_error");
/* First send error what ever it is ... */
my_message(errcode, err, MYF(0));
DBUG_VOID_RETURN;
}
void multi_delete::abort()
{
DBUG_ENTER("multi_delete::abort");
/* the error was handled or nothing deleted and no side effects return */
if (error_handled ||
!thd->transaction.stmt.modified_non_trans_table && !deleted)
DBUG_VOID_RETURN;
/* Something already deleted so we have to invalidate cache */
if (deleted)
query_cache_invalidate3(thd, delete_tables, 1);
/*
If rows from the first table only has been deleted and it is
transactional, just do rollback.
The same if all tables are transactional, regardless of where we are.
In all other cases do attempt deletes ...
*/
if ((table_being_deleted == delete_tables &&
table_being_deleted->table->file->has_transactions()) ||
!normal_tables)
ha_rollback_stmt(thd);
else if (do_delete)
{
/*
We have to execute the recorded do_deletes() and write info into the
error log
*/
error= 1;
send_eof();
DBUG_ASSERT(error_handled);
DBUG_VOID_RETURN;
}
if (thd->transaction.stmt.modified_non_trans_table)
{
/*
there is only side effects; to binlog with the error
*/
if (mysql_bin_log.is_open())
{
thd->binlog_query(THD::ROW_QUERY_TYPE,
thd->query, thd->query_length,
transactional_tables, FALSE);
}
thd->transaction.all.modified_non_trans_table= true;
}
DBUG_ASSERT(!normal_tables || !deleted ||
thd->transaction.stmt.modified_non_trans_table);
DBUG_VOID_RETURN;
}
/*
Do delete from other tables.
Returns values:
0 ok
1 error
*/
int multi_delete::do_deletes()
{
int local_error= 0, counter= 0, tmp_error;
bool will_batch;
DBUG_ENTER("do_deletes");
DBUG_ASSERT(do_delete);
do_delete= 0; // Mark called
if (!found)
DBUG_RETURN(0);
table_being_deleted= (delete_while_scanning ? delete_tables->next_local :
delete_tables);
for (; table_being_deleted;
table_being_deleted= table_being_deleted->next_local, counter++)
{
ha_rows last_deleted= deleted;
TABLE *table = table_being_deleted->table;
if (tempfiles[counter]->get(table))
{
local_error=1;
break;
}
READ_RECORD info;
init_read_record(&info,thd,table,NULL,0,1);
/*
Ignore any rows not found in reference tables as they may already have
been deleted by foreign key handling
*/
info.ignore_not_found_rows= 1;
will_batch= !table->file->start_bulk_delete();
while (!(local_error=info.read_record(&info)) && !thd->killed)
{
if (table->triggers &&
table->triggers->process_triggers(thd, TRG_EVENT_DELETE,
TRG_ACTION_BEFORE, FALSE))
{
local_error= 1;
break;
}
if ((local_error=table->file->ha_delete_row(table->record[0])))
{
table->file->print_error(local_error,MYF(0));
break;
}
deleted++;
if (table->triggers &&
table->triggers->process_triggers(thd, TRG_EVENT_DELETE,
TRG_ACTION_AFTER, FALSE))
{
local_error= 1;
break;
}
}
if (will_batch && (tmp_error= table->file->end_bulk_delete()))
{
if (!local_error)
{
local_error= tmp_error;
table->file->print_error(local_error,MYF(0));
}
}
if (last_deleted != deleted && !table->file->has_transactions())
thd->transaction.stmt.modified_non_trans_table= TRUE;
end_read_record(&info);
if (thd->killed && !local_error)
local_error= 1;
if (local_error == -1) // End of file
local_error = 0;
}
DBUG_RETURN(local_error);
}
/*
Send ok to the client
return: 0 sucess
1 error
*/
bool multi_delete::send_eof()
{
THD::killed_state killed_status= THD::NOT_KILLED;
thd->proc_info="deleting from reference tables";
/* Does deletes for the last n - 1 tables, returns 0 if ok */
int local_error= do_deletes(); // returns 0 if success
/* compute a total error to know if something failed */
local_error= local_error || error;
killed_status= (local_error == 0)? THD::NOT_KILLED : thd->killed;
/* reset used flags */
thd->proc_info="end";
/*
We must invalidate the query cache before binlog writing and
ha_autocommit_...
*/
if (deleted)
{
query_cache_invalidate3(thd, delete_tables, 1);
}
DBUG_ASSERT(!normal_tables || !deleted ||
thd->transaction.stmt.modified_non_trans_table);
if ((local_error == 0) || thd->transaction.stmt.modified_non_trans_table)
{
if (mysql_bin_log.is_open())
{
if (local_error == 0)
thd->clear_error();
if (thd->binlog_query(THD::ROW_QUERY_TYPE,
thd->query, thd->query_length,
transactional_tables, FALSE, killed_status) &&
!normal_tables)
{
local_error=1; // Log write failed: roll back the SQL statement
}
}
if (thd->transaction.stmt.modified_non_trans_table)
thd->transaction.all.modified_non_trans_table= TRUE;
}
if (local_error != 0)
error_handled= TRUE; // to force early leave from ::send_error()
/* Commit or rollback the current SQL statement */
if (transactional_tables)
if (ha_autocommit_or_rollback(thd,local_error > 0))
local_error=1;
if (!local_error)
{
thd->row_count_func= deleted;
::send_ok(thd, (ha_rows) thd->row_count_func);
}
return 0;
}
/***************************************************************************
TRUNCATE TABLE
****************************************************************************/
/*
Optimize delete of all rows by doing a full generate of the table
This will work even if the .ISM and .ISD tables are destroyed
dont_send_ok should be set if:
- We should always wants to generate the table (even if the table type
normally can't safely do this.
- We don't want an ok to be sent to the end user.
- We don't want to log the truncate command
- If we want to have a name lock on the table on exit without errors.
*/
bool mysql_truncate(THD *thd, TABLE_LIST *table_list, bool dont_send_ok)
{
HA_CREATE_INFO create_info;
char path[FN_REFLEN];
TABLE *table;
bool error;
uint path_length;
DBUG_ENTER("mysql_truncate");
bzero((char*) &create_info,sizeof(create_info));
/* If it is a temporary table, close and regenerate it */
if (!dont_send_ok && (table= find_temporary_table(thd, table_list)))
{
handlerton *table_type= table->s->db_type();
TABLE_SHARE *share= table->s;
if (!ha_check_storage_engine_flag(table_type, HTON_CAN_RECREATE))
goto trunc_by_del;
table->file->info(HA_STATUS_AUTO | HA_STATUS_NO_LOCK);
close_temporary_table(thd, table, 0, 0); // Don't free share
ha_create_table(thd, share->normalized_path.str,
share->db.str, share->table_name.str, &create_info, 1);
// We don't need to call invalidate() because this table is not in cache
if ((error= (int) !(open_temporary_table(thd, share->path.str,
share->db.str,
share->table_name.str, 1))))
(void) rm_temporary_table(table_type, path);
free_table_share(share);
my_free((char*) table,MYF(0));
/*
If we return here we will not have logged the truncation to the bin log
and we will not send_ok() to the client.
*/
goto end;
}
path_length= build_table_filename(path, sizeof(path), table_list->db,
table_list->table_name, reg_ext, 0);
if (!dont_send_ok)
{
enum legacy_db_type table_type;
mysql_frm_type(thd, path, &table_type);
if (table_type == DB_TYPE_UNKNOWN)
{
my_error(ER_NO_SUCH_TABLE, MYF(0),
table_list->db, table_list->table_name);
DBUG_RETURN(TRUE);
}
if (!ha_check_storage_engine_flag(ha_resolve_by_legacy_type(thd, table_type),
HTON_CAN_RECREATE))
goto trunc_by_del;
if (lock_and_wait_for_table_name(thd, table_list))
DBUG_RETURN(TRUE);
}
// Remove the .frm extension AIX 5.2 64-bit compiler bug (BUG#16155): this
// crashes, replacement works. *(path + path_length - reg_ext_length)=
// '\0';
path[path_length - reg_ext_length] = 0;
VOID(pthread_mutex_lock(&LOCK_open));
error= ha_create_table(thd, path, table_list->db, table_list->table_name,
&create_info, 1);
VOID(pthread_mutex_unlock(&LOCK_open));
query_cache_invalidate3(thd, table_list, 0);
end:
if (!dont_send_ok)
{
if (!error)
{
/*
TRUNCATE must always be statement-based binlogged (not row-based) so
we don't test current_stmt_binlog_row_based.
*/
write_bin_log(thd, TRUE, thd->query, thd->query_length);
send_ok(thd); // This should return record count
}
VOID(pthread_mutex_lock(&LOCK_open));
unlock_table_name(thd, table_list);
VOID(pthread_mutex_unlock(&LOCK_open));
}
else if (error)
{
VOID(pthread_mutex_lock(&LOCK_open));
unlock_table_name(thd, table_list);
VOID(pthread_mutex_unlock(&LOCK_open));
}
DBUG_RETURN(error);
trunc_by_del:
/* Probably InnoDB table */
ulonglong save_options= thd->options;
table_list->lock_type= TL_WRITE;
thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_NOT_AUTOCOMMIT);
ha_enable_transaction(thd, FALSE);
mysql_init_select(thd->lex);
bool save_binlog_row_based= thd->current_stmt_binlog_row_based;
thd->clear_current_stmt_binlog_row_based();
error= mysql_delete(thd, table_list, (COND*) 0, (SQL_LIST*) 0,
HA_POS_ERROR, LL(0), TRUE);
ha_enable_transaction(thd, TRUE);
thd->options= save_options;
thd->current_stmt_binlog_row_based= save_binlog_row_based;
DBUG_RETURN(error);
}
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