197
95
The following functions form part of the C plugin API
200
97
extern "C" int mysql_tmpfile(const char *prefix)
202
99
char filename[FN_REFLEN];
203
File fd = create_temp_file(filename, mysql_tmpdir, prefix,
204
O_CREAT | O_EXCL | O_RDWR | O_TEMPORARY,
100
File fd = create_temp_file(filename, drizzle_tmpdir, prefix, MYF(MY_WME));
208
This can be removed once the following bug is fixed:
209
Bug #28903 create_temp_file() doesn't honor O_TEMPORARY option
210
(file not removed) (Unix)
212
102
unlink(filename);
220
int thd_in_lock_tables(const THD *thd)
222
return test(thd->in_lock_tables);
227
int thd_tablespace_op(const THD *thd)
229
return test(thd->tablespace_op);
234
const char *set_thd_proc_info(THD *thd, const char *info,
235
const char *calling_function __attribute__((unused)),
236
const char *calling_file __attribute__((unused)),
237
const unsigned int calling_line __attribute__((unused)))
239
const char *old_info= thd->get_proc_info();
240
thd->set_proc_info(info);
245
void **thd_ha_data(const THD *thd, const struct handlerton *hton)
247
return (void **) &thd->ha_data[hton->slot].ha_ptr;
251
int64_t thd_test_options(const THD *thd, int64_t test_options)
253
return thd->options & test_options;
257
int thd_sql_command(const THD *thd)
259
return (int) thd->lex->sql_command;
263
int thd_tx_isolation(const THD *thd)
265
return (int) thd->variables.tx_isolation;
269
void thd_inc_row_count(THD *thd)
275
Clear this diagnostics area.
277
Normally called at the end of a statement.
281
Diagnostics_area::reset_diagnostics_area()
283
can_overwrite_status= false;
284
/** Don't take chances in production */
290
m_total_warn_count= 0;
292
/** Tiny reset in debug mode to see garbage right away */
298
Set OK status -- ends commands that do not return a
299
result set, e.g. INSERT/UPDATE/DELETE.
303
Diagnostics_area::set_ok_status(THD *thd, ha_rows affected_rows_arg,
304
uint64_t last_insert_id_arg,
305
const char *message_arg)
309
In production, refuse to overwrite an error or a custom response
312
if (is_error() || is_disabled())
314
/** Only allowed to report success if has not yet reported an error */
316
m_server_status= thd->server_status;
317
m_total_warn_count= thd->total_warn_count;
318
m_affected_rows= affected_rows_arg;
319
m_last_insert_id= last_insert_id_arg;
321
strmake(m_message, message_arg, sizeof(m_message) - 1);
333
Diagnostics_area::set_eof_status(THD *thd)
335
/** Only allowed to report eof if has not yet reported an error */
339
In production, refuse to overwrite an error or a custom response
342
if (is_error() || is_disabled())
345
m_server_status= thd->server_status;
347
If inside a stored procedure, do not return the total
348
number of warnings, since they are not available to the client
351
m_total_warn_count= thd->total_warn_count;
361
Diagnostics_area::set_error_status(THD *thd __attribute__((unused)),
362
uint32_t sql_errno_arg,
363
const char *message_arg)
366
Only allowed to report error if has not yet reported a success
367
The only exception is when we flush the message to the client,
368
an error can happen during the flush.
370
assert(! is_set() || can_overwrite_status);
372
In production, refuse to overwrite a custom response with an
378
m_sql_errno= sql_errno_arg;
379
strmake(m_message, message_arg, sizeof(m_message) - 1);
386
Mark the diagnostics area as 'DISABLED'.
388
This is used in rare cases when the COM_ command at hand sends a response
389
in a custom format. One example is the query cache, another is
394
Diagnostics_area::disable_status()
397
m_status= DA_DISABLED;
402
:Statement(&main_lex, &main_mem_root,
403
/* statement id */ 0),
404
Open_tables_state(refresh_version), rli_fake(0),
405
lock_id(&main_lock_id),
406
user_time(0), in_sub_stmt(0),
407
binlog_table_maps(0), binlog_flags(0UL),
408
arg_of_last_insert_id_function(false),
409
first_successful_insert_id_in_prev_stmt(0),
410
first_successful_insert_id_in_prev_stmt_for_binlog(0),
411
first_successful_insert_id_in_cur_stmt(0),
412
stmt_depends_on_first_successful_insert_id_in_prev_stmt(false),
415
transaction_rollback_request(0),
416
is_fatal_sub_stmt_error(0),
421
derived_tables_processing(false),
109
int session_tablespace_op(const Session *session)
111
return test(session->tablespace_op);
115
Set the process info field of the Session structure.
117
This function is used by plug-ins. Internally, the
118
Session::set_proc_info() function should be used.
120
@see Session::set_proc_info
123
set_session_proc_info(Session *session, const char *info)
125
session->set_proc_info(info);
129
const char *get_session_proc_info(Session *session)
131
return session->get_proc_info();
135
void **session_ha_data(const Session *session, const struct StorageEngine *engine)
137
return (void **) &session->ha_data[engine->slot].ha_ptr;
141
int64_t session_test_options(const Session *session, int64_t test_options)
143
return session->options & test_options;
147
int session_sql_command(const Session *session)
149
return (int) session->lex->sql_command;
153
int session_tx_isolation(const Session *session)
155
return (int) session->variables.tx_isolation;
159
void session_inc_row_count(Session *session)
161
session->row_count++;
164
Session::Session(Protocol *protocol_arg)
166
Statement(&main_lex, &main_mem_root, /* statement id */ 0),
167
Open_tables_state(refresh_version),
168
lock_id(&main_lock_id),
170
arg_of_last_insert_id_function(false),
171
first_successful_insert_id_in_prev_stmt(0),
172
first_successful_insert_id_in_cur_stmt(0),
175
some_tables_deleted(false),
178
is_fatal_error(false),
179
transaction_rollback_request(false),
180
is_fatal_sub_stmt_error(0),
181
derived_tables_processing(false),
182
tablespace_op(false),
189
memset(process_list_info, 0, PROCESS_LIST_WIDTH);
427
192
Pass nominal parameters to init_alloc_root only to ensure that
841
544
assert(thread_stack);
843
if (my_pthread_setspecific_ptr(THR_THD, this) ||
844
my_pthread_setspecific_ptr(THR_MALLOC, &mem_root))
546
if (pthread_setspecific(THR_Session, this) ||
547
pthread_setspecific(THR_Mem_root, &mem_root))
846
549
mysys_var=my_thread_var;
848
552
Let mysqld define the thread id (not mysys)
849
This allows us to move THD to different threads if needed.
553
This allows us to move Session to different threads if needed.
851
555
mysys_var->id= thread_id;
852
556
real_id= pthread_self(); // For debugging
855
We have to call thr_lock_info_init() again here as THD may have been
559
We have to call thr_lock_info_init() again here as Session may have been
856
560
created in another thread
858
562
thr_lock_info_init(&lock_info);
867
THD::cleanup_after_query()
870
This function is used to reset thread data to its default state.
873
This function is not suitable for setting thread data to some
874
non-default values, as there is only one replication thread, so
875
different master threads may overwrite data of each other on
879
void THD::cleanup_after_query()
882
Reset rand_used so that detection of calls to rand() will save random
566
void Session::prepareForQueries()
568
if (variables.max_join_size == HA_POS_ERROR)
569
options |= OPTION_BIG_SELECTS;
570
if (client_capabilities & CLIENT_COMPRESS)
572
protocol->enableCompression();
575
version= refresh_version;
582
bool Session::initGlobals()
586
disconnect(ER_OUT_OF_RESOURCES, true);
587
statistic_increment(aborted_connects, &LOCK_status);
588
Scheduler &thread_scheduler= get_thread_scheduler();
589
thread_scheduler.end_thread(this, 0);
595
bool Session::authenticate()
598
if (protocol->authenticate())
601
statistic_increment(aborted_connects, &LOCK_status);
605
bool Session::checkUser(const char *passwd, uint32_t passwd_len, const char *in_db)
607
LEX_STRING db_str= { (char *) in_db, in_db ? strlen(in_db) : 0 };
608
bool is_authenticated;
611
Clear session->db as it points to something, that will be freed when
612
connection is closed. We don't want to accidentally free a wrong
613
pointer if connect failed. Also in case of 'CHANGE USER' failure,
614
current database will be switched to 'no database selected'.
618
if (passwd_len != 0 && passwd_len != SCRAMBLE_LENGTH)
620
my_error(ER_HANDSHAKE_ERROR, MYF(0), security_ctx.ip.c_str());
624
is_authenticated= authenticate_user(this, passwd);
626
if (is_authenticated != true)
628
my_error(ER_ACCESS_DENIED_ERROR, MYF(0),
629
security_ctx.user.c_str(),
630
security_ctx.ip.c_str(),
631
passwd_len ? ER(ER_YES) : ER(ER_NO));
636
security_ctx.skip_grants();
638
/* Change database if necessary */
639
if (in_db && in_db[0])
641
if (mysql_change_db(this, &db_str, false))
643
/* mysql_change_db() has pushed the error message. */
648
password= test(passwd_len); // remember for error messages
650
/* Ready to handle queries */
654
bool Session::executeStatement()
657
uint32_t packet_length;
659
enum enum_server_command l_command;
662
indicator of uninitialized lex => normal flow of errors handling
665
lex->current_select= 0;
667
if (protocol->readCommand(&l_packet, &packet_length) == false)
670
if (packet_length == 0)
673
l_command= (enum enum_server_command) (unsigned char) l_packet[0];
675
if (command >= COM_END)
676
command= COM_END; // Wrong command
678
assert(packet_length);
679
return ! dispatch_command(l_command, this, l_packet+1, (uint32_t) (packet_length-1));
682
bool Session::readAndStoreQuery(const char *in_packet, uint32_t in_packet_length)
684
/* Remove garbage at start and end of query */
685
while (in_packet_length > 0 && my_isspace(charset(), in_packet[0]))
690
const char *pos= in_packet + in_packet_length; /* Point at end null */
691
while (in_packet_length > 0 &&
692
(pos[-1] == ';' || my_isspace(charset() ,pos[-1])))
698
/* We must allocate some extra memory for the cached query string */
699
query_length= 0; /* Extra safety: Avoid races */
700
query= (char*) memdup_w_gap((unsigned char*) in_packet, in_packet_length, db_length + 1);
704
query[in_packet_length]=0;
705
query_length= in_packet_length;
707
/* Reclaim some memory */
708
packet.shrink(variables.net_buffer_length);
709
convert_buffer.shrink(variables.net_buffer_length);
714
bool Session::endTransaction(enum enum_mysql_completiontype completion)
719
if (transaction.xid_state.xa_state != XA_NOTR)
721
my_error(ER_XAER_RMFAIL, MYF(0), xa_state_names[transaction.xid_state.xa_state]);
728
* We don't use endActiveTransaction() here to ensure that this works
729
* even if there is a problem with the OPTION_AUTO_COMMIT flag
730
* (Which of course should never happen...)
732
server_status&= ~SERVER_STATUS_IN_TRANS;
735
options&= ~(OPTION_BEGIN | OPTION_KEEP_LOG);
736
transaction.all.modified_non_trans_table= false;
739
do_release= 1; /* fall through */
740
case COMMIT_AND_CHAIN:
741
result= endActiveTransaction();
742
if (result == true && completion == COMMIT_AND_CHAIN)
743
result= startTransaction();
745
case ROLLBACK_RELEASE:
746
do_release= 1; /* fall through */
748
case ROLLBACK_AND_CHAIN:
750
server_status&= ~SERVER_STATUS_IN_TRANS;
751
if (ha_rollback(this))
753
options&= ~(OPTION_BEGIN | OPTION_KEEP_LOG);
754
transaction.all.modified_non_trans_table= false;
755
if (result == true && (completion == ROLLBACK_AND_CHAIN))
756
result= startTransaction();
760
my_error(ER_UNKNOWN_COM_ERROR, MYF(0));
765
my_error(killed_errno(), MYF(0));
766
else if ((result == true) && do_release)
767
killed= Session::KILL_CONNECTION;
772
bool Session::endActiveTransaction()
776
if (transaction.xid_state.xa_state != XA_NOTR)
778
my_error(ER_XAER_RMFAIL, MYF(0), xa_state_names[transaction.xid_state.xa_state]);
781
if (options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))
783
server_status&= ~SERVER_STATUS_IN_TRANS;
787
options&= ~(OPTION_BEGIN | OPTION_KEEP_LOG);
788
transaction.all.modified_non_trans_table= false;
792
bool Session::startTransaction()
796
if (! endActiveTransaction())
800
options|= OPTION_BEGIN;
801
server_status|= SERVER_STATUS_IN_TRANS;
802
if (lex->start_transaction_opt & DRIZZLE_START_TRANS_OPT_WITH_CONS_SNAPSHOT)
803
if (ha_start_consistent_snapshot(this))
809
void Session::cleanup_after_query()
812
Reset rand_used so that detection of calls to rand() will save random
883
813
seeds if needed by the slave.
885
Do not reset rand_used if inside a stored function or trigger because
886
only the call to these operations is logged. Thus only the calling
887
statement needs to detect rand() calls made by its substatements. These
888
substatements must not set rand_used to 0 because it would remove the
889
detection of rand() by the calling statement.
891
if (!in_sub_stmt) /* stored functions and triggers are a special case */
893
816
/* Forget those values, for next binlogger: */
894
stmt_depends_on_first_successful_insert_id_in_prev_stmt= 0;
895
817
auto_inc_intervals_in_cur_stmt_for_binlog.empty();
898
819
if (first_successful_insert_id_in_cur_stmt > 0)
900
821
/* set what LAST_INSERT_ID() will return */
901
first_successful_insert_id_in_prev_stmt=
902
first_successful_insert_id_in_cur_stmt;
822
first_successful_insert_id_in_prev_stmt= first_successful_insert_id_in_cur_stmt;
903
823
first_successful_insert_id_in_cur_stmt= 0;
904
824
substitute_null_with_insert_id= true;
906
arg_of_last_insert_id_function= 0;
826
arg_of_last_insert_id_function= false;
907
827
/* Free Items that were created during this execution */
909
829
/* Reset where. */
910
where= THD::DEFAULT_WHERE;
830
where= Session::DEFAULT_WHERE;
915
834
Create a LEX_STRING in this connection.
2149
1653
access to mysql.proc table to find definitions of stored routines.
2150
1654
****************************************************************************/
2152
void THD::reset_n_backup_open_tables_state(Open_tables_state *backup)
1656
void Session::reset_n_backup_open_tables_state(Open_tables_state *backup)
2154
1658
backup->set_open_tables_state(this);
2155
1659
reset_open_tables_state();
2156
1660
state_flags|= Open_tables_state::BACKUPS_AVAIL;
2161
void THD::restore_backup_open_tables_state(Open_tables_state *backup)
1664
void Session::restore_backup_open_tables_state(Open_tables_state *backup)
2164
1667
Before we will throw away current open tables state we want
2165
1668
to be sure that it was properly cleaned up.
2167
1670
assert(open_tables == 0 && temporary_tables == 0 &&
2168
handler_tables == 0 && derived_tables == 0 &&
2169
lock == 0 && locked_tables == 0);
1671
derived_tables == 0 &&
2170
1673
set_open_tables_state(backup);
1677
bool Session::set_db(const char *new_db, size_t new_db_len)
1679
/* Do not reallocate memory if current chunk is big enough. */
1680
if (db && new_db && db_length >= new_db_len)
1681
memcpy(db, new_db, new_db_len+1);
1688
db= (char *)malloc(new_db_len + 1);
1691
memcpy(db, new_db, new_db_len);
1698
db_length= db ? new_db_len : 0;
1699
return new_db && !db;
2175
1704
Check the killed state of a user thread
2176
@param thd user thread
1705
@param session user thread
2177
1706
@retval 0 the user thread is active
2178
1707
@retval 1 the user thread has been killed
2180
extern "C" int thd_killed(const DRIZZLE_THD thd)
1709
extern "C" int session_killed(const Session *session)
2182
return(thd->killed);
1711
return(session->killed);
2186
1715
Return the thread id of a user thread
2187
@param thd user thread
1716
@param session user thread
2188
1717
@return thread id
2190
extern "C" unsigned long thd_get_thread_id(const DRIZZLE_THD thd)
2192
return((unsigned long)thd->thread_id);
2196
#ifdef INNODB_COMPATIBILITY_HOOKS
2197
extern "C" const struct charset_info_st *thd_charset(DRIZZLE_THD thd)
2199
return(thd->charset());
2202
extern "C" char **thd_query(DRIZZLE_THD thd)
2204
return(&thd->query);
2207
extern "C" int thd_slave_thread(const DRIZZLE_THD thd)
2209
return(thd->slave_thread);
2212
extern "C" int thd_non_transactional_update(const DRIZZLE_THD thd)
2214
return(thd->transaction.all.modified_non_trans_table);
2217
extern "C" int thd_binlog_format(const DRIZZLE_THD thd)
2219
return (int) thd->variables.binlog_format;
2222
extern "C" void thd_mark_transaction_to_rollback(DRIZZLE_THD thd, bool all)
2224
mark_transaction_to_rollback(thd, all);
2226
#endif // INNODB_COMPATIBILITY_HOOKS */
1719
extern "C" unsigned long session_get_thread_id(const Session *session)
1721
return((unsigned long)session->thread_id);
1726
LEX_STRING *session_make_lex_string(Session *session, LEX_STRING *lex_str,
1727
const char *str, unsigned int size,
1728
int allocate_lex_string)
1730
return session->make_lex_string(lex_str, str, size,
1731
(bool) allocate_lex_string);
1734
extern "C" const struct charset_info_st *session_charset(Session *session)
1736
return(session->charset());
1739
extern "C" char **session_query(Session *session)
1741
return(&session->query);
1744
extern "C" int session_non_transactional_update(const Session *session)
1746
return(session->transaction.all.modified_non_trans_table);
1749
extern "C" void session_mark_transaction_to_rollback(Session *session, bool all)
1751
mark_transaction_to_rollback(session, all);
2230
1755
Mark transaction to rollback and mark error as fatal to a sub-statement.
2232
@param thd Thread handle
1757
@param session Thread handle
2233
1758
@param all true <=> rollback main transaction.
2236
void mark_transaction_to_rollback(THD *thd, bool all)
2240
thd->is_fatal_sub_stmt_error= true;
2241
thd->transaction_rollback_request= all;
2244
/***************************************************************************
2245
Handling of XA id cacheing
2246
***************************************************************************/
2248
pthread_mutex_t LOCK_xid_cache;
2251
extern "C" unsigned char *xid_get_hash_key(const unsigned char *, size_t *, bool);
2252
extern "C" void xid_free_hash(void *);
2254
unsigned char *xid_get_hash_key(const unsigned char *ptr, size_t *length,
2255
bool not_used __attribute__((unused)))
2257
*length=((XID_STATE*)ptr)->xid.key_length();
2258
return ((XID_STATE*)ptr)->xid.key();
2261
void xid_free_hash(void *ptr)
2263
if (!((XID_STATE*)ptr)->in_thd)
2264
free((unsigned char*)ptr);
2267
bool xid_cache_init()
2269
pthread_mutex_init(&LOCK_xid_cache, MY_MUTEX_INIT_FAST);
2270
return hash_init(&xid_cache, &my_charset_bin, 100, 0, 0,
2271
xid_get_hash_key, xid_free_hash, 0) != 0;
2274
void xid_cache_free()
2276
if (hash_inited(&xid_cache))
2278
hash_free(&xid_cache);
2279
pthread_mutex_destroy(&LOCK_xid_cache);
2283
XID_STATE *xid_cache_search(XID *xid)
2285
pthread_mutex_lock(&LOCK_xid_cache);
2286
XID_STATE *res=(XID_STATE *)hash_search(&xid_cache, xid->key(), xid->key_length());
2287
pthread_mutex_unlock(&LOCK_xid_cache);
2292
bool xid_cache_insert(XID *xid, enum xa_states xa_state)
2296
pthread_mutex_lock(&LOCK_xid_cache);
2297
if (hash_search(&xid_cache, xid->key(), xid->key_length()))
2299
else if (!(xs=(XID_STATE *)my_malloc(sizeof(*xs), MYF(MY_WME))))
2303
xs->xa_state=xa_state;
2306
res=my_hash_insert(&xid_cache, (unsigned char*)xs);
2308
pthread_mutex_unlock(&LOCK_xid_cache);
2313
bool xid_cache_insert(XID_STATE *xid_state)
2315
pthread_mutex_lock(&LOCK_xid_cache);
2316
assert(hash_search(&xid_cache, xid_state->xid.key(),
2317
xid_state->xid.key_length())==0);
2318
bool res=my_hash_insert(&xid_cache, (unsigned char*)xid_state);
2319
pthread_mutex_unlock(&LOCK_xid_cache);
2324
void xid_cache_delete(XID_STATE *xid_state)
2326
pthread_mutex_lock(&LOCK_xid_cache);
2327
hash_delete(&xid_cache, (unsigned char *)xid_state);
2328
pthread_mutex_unlock(&LOCK_xid_cache);
2332
Implementation of interface to write rows to the binary log through the
2333
thread. The thread is responsible for writing the rows it has
2334
inserted/updated/deleted.
2339
Template member function for ensuring that there is an rows log
2340
event of the apropriate type before proceeding.
2343
- Events of type 'RowEventT' have the type code 'type_code'.
2346
If a non-NULL pointer is returned, the pending event for thread 'thd' will
2347
be an event of type 'RowEventT' (which have the type code 'type_code')
2348
will either empty or have enough space to hold 'needed' bytes. In
2349
addition, the columns bitmap will be correct for the row, meaning that
2350
the pending event will be flushed if the columns in the event differ from
2351
the columns suppled to the function.
2354
If no error, a non-NULL pending event (either one which already existed or
2355
the newly created one).
2359
template <class RowsEventT> Rows_log_event*
2360
THD::binlog_prepare_pending_rows_event(Table* table, uint32_t serv_id,
2362
bool is_transactional,
2363
RowsEventT *hint __attribute__((unused)))
2365
/* Pre-conditions */
2366
assert(table->s->table_map_id != UINT32_MAX);
2368
/* Fetch the type code for the RowsEventT template parameter */
2369
int const type_code= RowsEventT::TYPE_CODE;
2372
There is no good place to set up the transactional data, so we
2375
if (binlog_setup_trx_data())
2378
Rows_log_event* pending= binlog_get_pending_rows_event();
2380
if (unlikely(pending && !pending->is_valid()))
2384
Check if the current event is non-NULL and a write-rows
2385
event. Also check if the table provided is mapped: if it is not,
2386
then we have switched to writing to a new table.
2387
If there is no pending event, we need to create one. If there is a pending
2388
event, but it's not about the same table id, or not of the same type
2389
(between Write, Update and Delete), or not the same affected columns, or
2390
going to be too big, flush this event to disk and create a new pending
2393
The last test is necessary for the Cluster injector to work
2394
correctly. The reason is that the Cluster can inject two write
2395
rows with different column bitmaps if there is an insert followed
2396
by an update in the same transaction, and these are grouped into a
2397
single epoch/transaction when fed to the injector.
2399
TODO: Fix the code so that the last test can be removed.
2402
pending->server_id != serv_id ||
2403
pending->get_table_id() != table->s->table_map_id ||
2404
pending->get_type_code() != type_code ||
2405
pending->get_data_size() + needed > opt_binlog_rows_event_max_size ||
2406
!bitmap_cmp(pending->get_cols(), table->write_set))
2408
/* Create a new RowsEventT... */
2409
Rows_log_event* const
2410
ev= new RowsEventT(this, table, table->s->table_map_id,
2414
ev->server_id= serv_id; // I don't like this, it's too easy to forget.
2416
flush the pending event and replace it with the newly created
2419
if (unlikely(mysql_bin_log.flush_and_set_pending_rows_event(this, ev)))
2425
return(ev); /* This is the new pending event */
2427
return(pending); /* This is the current pending event */
2430
#ifdef HAVE_EXPLICIT_TEMPLATE_INSTANTIATION
2432
Instantiate the versions we need, we have -fno-implicit-template as
2435
template Rows_log_event*
2436
THD::binlog_prepare_pending_rows_event(Table*, uint32_t, size_t, bool,
2437
Write_rows_log_event*);
2439
template Rows_log_event*
2440
THD::binlog_prepare_pending_rows_event(Table*, uint32_t, size_t, bool,
2441
Delete_rows_log_event *);
2443
template Rows_log_event*
2444
THD::binlog_prepare_pending_rows_event(Table*, uint32_t, size_t, bool,
2445
Update_rows_log_event *);
2450
Class to handle temporary allocation of memory for row data.
2452
The responsibilities of the class is to provide memory for
2453
packing one or two rows of packed data (depending on what
2454
constructor is called).
2456
In order to make the allocation more efficient for "simple" rows,
2457
i.e., rows that do not contain any blobs, a pointer to the
2458
allocated memory is of memory is stored in the table structure
2459
for simple rows. If memory for a table containing a blob field
2460
is requested, only memory for that is allocated, and subsequently
2461
released when the object is destroyed.
2464
class Row_data_memory {
2467
Build an object to keep track of a block-local piece of memory
2468
for storing a row of data.
2471
Table where the pre-allocated memory is stored.
2474
Length of data that is needed, if the record contain blobs.
2476
Row_data_memory(Table *table, size_t const len1)
2479
m_alloc_checked= false;
2480
allocate_memory(table, len1);
2481
m_ptr[0]= has_memory() ? m_memory : 0;
2485
Row_data_memory(Table *table, size_t const len1, size_t const len2)
2488
m_alloc_checked= false;
2489
allocate_memory(table, len1 + len2);
2490
m_ptr[0]= has_memory() ? m_memory : 0;
2491
m_ptr[1]= has_memory() ? m_memory + len1 : 0;
2496
if (m_memory != 0 && m_release_memory_on_destruction)
2497
free((unsigned char*) m_memory);
2501
Is there memory allocated?
2503
@retval true There is memory allocated
2504
@retval false Memory allocation failed
2506
bool has_memory() const {
2507
m_alloc_checked= true;
2508
return m_memory != 0;
2511
unsigned char *slot(uint32_t s)
2513
assert(s < sizeof(m_ptr)/sizeof(*m_ptr));
2514
assert(m_ptr[s] != 0);
2515
assert(m_alloc_checked == true);
2520
void allocate_memory(Table *const table, size_t const total_length)
2522
if (table->s->blob_fields == 0)
2525
The maximum length of a packed record is less than this
2526
length. We use this value instead of the supplied length
2527
when allocating memory for records, since we don't know how
2528
the memory will be used in future allocations.
2530
Since table->s->reclength is for unpacked records, we have
2531
to add two bytes for each field, which can potentially be
2532
added to hold the length of a packed field.
2534
size_t const maxlen= table->s->reclength + 2 * table->s->fields;
2537
Allocate memory for two records if memory hasn't been
2538
allocated. We allocate memory for two records so that it can
2539
be used when processing update rows as well.
2541
if (table->write_row_record == 0)
2542
table->write_row_record=
2543
(unsigned char *) alloc_root(&table->mem_root, 2 * maxlen);
2544
m_memory= table->write_row_record;
2545
m_release_memory_on_destruction= false;
2549
m_memory= (unsigned char *) my_malloc(total_length, MYF(MY_WME));
2550
m_release_memory_on_destruction= true;
2554
mutable bool m_alloc_checked;
2555
bool m_release_memory_on_destruction;
2556
unsigned char *m_memory;
2557
unsigned char *m_ptr[2];
2562
int THD::binlog_write_row(Table* table, bool is_trans,
2563
unsigned char const *record)
2565
assert(current_stmt_binlog_row_based && mysql_bin_log.is_open());
2568
Pack records into format for transfer. We are allocating more
2569
memory than needed, but that doesn't matter.
2571
Row_data_memory memory(table, table->max_row_length(record));
2572
if (!memory.has_memory())
2573
return HA_ERR_OUT_OF_MEM;
2575
unsigned char *row_data= memory.slot(0);
2577
size_t const len= pack_row(table, table->write_set, row_data, record);
2579
Rows_log_event* const ev=
2580
binlog_prepare_pending_rows_event(table, server_id, len, is_trans,
2581
static_cast<Write_rows_log_event*>(0));
2583
if (unlikely(ev == 0))
2584
return HA_ERR_OUT_OF_MEM;
2586
return ev->add_row_data(row_data, len);
2589
int THD::binlog_update_row(Table* table, bool is_trans,
2590
const unsigned char *before_record,
2591
const unsigned char *after_record)
2593
assert(current_stmt_binlog_row_based && mysql_bin_log.is_open());
2595
size_t const before_maxlen = table->max_row_length(before_record);
2596
size_t const after_maxlen = table->max_row_length(after_record);
2598
Row_data_memory row_data(table, before_maxlen, after_maxlen);
2599
if (!row_data.has_memory())
2600
return HA_ERR_OUT_OF_MEM;
2602
unsigned char *before_row= row_data.slot(0);
2603
unsigned char *after_row= row_data.slot(1);
2605
size_t const before_size= pack_row(table, table->read_set, before_row,
2607
size_t const after_size= pack_row(table, table->write_set, after_row,
2610
Rows_log_event* const ev=
2611
binlog_prepare_pending_rows_event(table, server_id,
2612
before_size + after_size, is_trans,
2613
static_cast<Update_rows_log_event*>(0));
2615
if (unlikely(ev == 0))
2616
return HA_ERR_OUT_OF_MEM;
2619
ev->add_row_data(before_row, before_size) ||
2620
ev->add_row_data(after_row, after_size);
2623
int THD::binlog_delete_row(Table* table, bool is_trans,
2624
unsigned char const *record)
2626
assert(current_stmt_binlog_row_based && mysql_bin_log.is_open());
2629
Pack records into format for transfer. We are allocating more
2630
memory than needed, but that doesn't matter.
2632
Row_data_memory memory(table, table->max_row_length(record));
2633
if (unlikely(!memory.has_memory()))
2634
return HA_ERR_OUT_OF_MEM;
2636
unsigned char *row_data= memory.slot(0);
2638
size_t const len= pack_row(table, table->read_set, row_data, record);
2640
Rows_log_event* const ev=
2641
binlog_prepare_pending_rows_event(table, server_id, len, is_trans,
2642
static_cast<Delete_rows_log_event*>(0));
2644
if (unlikely(ev == 0))
2645
return HA_ERR_OUT_OF_MEM;
2647
return ev->add_row_data(row_data, len);
2651
int THD::binlog_flush_pending_rows_event(bool stmt_end)
2654
We shall flush the pending event even if we are not in row-based
2655
mode: it might be the case that we left row-based mode before
2656
flushing anything (e.g., if we have explicitly locked tables).
2658
if (!mysql_bin_log.is_open())
2662
Mark the event as the last event of a statement if the stmt_end
2666
if (Rows_log_event *pending= binlog_get_pending_rows_event())
2670
pending->set_flags(Rows_log_event::STMT_END_F);
2671
pending->flags|= LOG_EVENT_UPDATE_TABLE_MAP_VERSION_F;
2672
binlog_table_maps= 0;
2675
error= mysql_bin_log.flush_and_set_pending_rows_event(this, 0);
2683
Member function that will log query, either row-based or
2684
statement-based depending on the value of the 'current_stmt_binlog_row_based'
2685
the value of the 'qtype' flag.
2687
This function should be called after the all calls to ha_*_row()
2688
functions have been issued, but before tables are unlocked and
2692
There shall be no writes to any system table after calling
2693
binlog_query(), so these writes has to be moved to before the call
2694
of binlog_query() for correct functioning.
2696
This is necessesary not only for RBR, but the master might crash
2697
after binlogging the query but before changing the system tables.
2698
This means that the slave and the master are not in the same state
2699
(after the master has restarted), so therefore we have to
2700
eliminate this problem.
2703
Error code, or 0 if no error.
2705
int THD::binlog_query(THD::enum_binlog_query_type qtype, char const *query_arg,
2706
ulong query_len, bool is_trans, bool suppress_use,
2707
THD::killed_state killed_status_arg)
2709
assert(query_arg && mysql_bin_log.is_open());
2711
if (int error= binlog_flush_pending_rows_event(true))
2715
If we are in statement mode and trying to log an unsafe statement,
2716
we should print a warning.
2718
if (lex->is_stmt_unsafe() &&
2719
variables.binlog_format == BINLOG_FORMAT_STMT)
2721
assert(this->query != NULL);
2722
push_warning(this, DRIZZLE_ERROR::WARN_LEVEL_WARN,
2723
ER_BINLOG_UNSAFE_STATEMENT,
2724
ER(ER_BINLOG_UNSAFE_STATEMENT));
2725
if (!(binlog_flags & BINLOG_FLAG_UNSAFE_STMT_PRINTED))
2727
char warn_buf[DRIZZLE_ERRMSG_SIZE];
2728
snprintf(warn_buf, DRIZZLE_ERRMSG_SIZE, "%s Statement: %s",
2729
ER(ER_BINLOG_UNSAFE_STATEMENT), this->query);
2730
sql_print_warning(warn_buf);
2731
binlog_flags|= BINLOG_FLAG_UNSAFE_STMT_PRINTED;
2736
case THD::ROW_QUERY_TYPE:
2737
if (current_stmt_binlog_row_based)
2739
/* Otherwise, we fall through */
2740
case THD::DRIZZLE_QUERY_TYPE:
2742
Using this query type is a conveniece hack, since we have been
2743
moving back and forth between using RBR for replication of
2744
system tables and not using it.
2746
Make sure to change in check_table_binlog_row_based() according
2747
to how you treat this.
2749
case THD::STMT_QUERY_TYPE:
2751
The DRIZZLE_LOG::write() function will set the STMT_END_F flag and
2752
flush the pending rows event if necessary.
2755
Query_log_event qinfo(this, query_arg, query_len, is_trans, suppress_use,
2757
qinfo.flags|= LOG_EVENT_UPDATE_TABLE_MAP_VERSION_F;
2759
Binlog table maps will be irrelevant after a Query_log_event
2760
(they are just removed on the slave side) so after the query
2761
log event is written to the binary log, we pretend that no
2762
table maps were written.
2764
int error= mysql_bin_log.write(&qinfo);
2765
binlog_table_maps= 0;
2770
case THD::QUERY_TYPE_COUNT:
2772
assert(0 <= qtype && qtype < QUERY_TYPE_COUNT);
2777
bool Discrete_intervals_list::append(uint64_t start, uint64_t val,
2780
/* first, see if this can be merged with previous */
2781
if ((head == NULL) || tail->merge_if_contiguous(start, val, incr))
2783
/* it cannot, so need to add a new interval */
2784
Discrete_interval *new_interval= new Discrete_interval(start, val, incr);
2785
return(append(new_interval));
2790
bool Discrete_intervals_list::append(Discrete_interval *new_interval)
2792
if (unlikely(new_interval == NULL))
2795
head= current= new_interval;
2797
tail->next= new_interval;
1760
void mark_transaction_to_rollback(Session *session, bool all)
1764
session->is_fatal_sub_stmt_error= true;
1765
session->transaction_rollback_request= all;
1769
void Session::disconnect(uint32_t errcode, bool should_lock)
1771
/* Allow any plugins to cleanup their session variables */
1772
plugin_sessionvar_cleanup(this);
1774
/* If necessary, log any aborted or unauthorized connections */
1775
if (killed || protocol->wasAborted())
1776
statistic_increment(aborted_threads, &LOCK_status);
1778
if (protocol->wasAborted())
1780
if (! killed && variables.log_warnings > 1)
1782
Security_context *sctx= &security_ctx;
1784
errmsg_printf(ERRMSG_LVL_WARN, ER(ER_NEW_ABORTING_CONNECTION)
1786
, (db ? db : "unconnected")
1787
, sctx->user.empty() == false ? sctx->user.c_str() : "unauthenticated"
1789
, (main_da.is_error() ? main_da.message() : ER(ER_UNKNOWN_ERROR)));
1793
/* Close out our connection to the client */
1795
(void) pthread_mutex_lock(&LOCK_thread_count);
1796
killed= Session::KILL_CONNECTION;
1797
if (protocol->isConnected())
1801
/*my_error(errcode, ER(errcode));*/
1802
protocol->sendError(errcode, ER(errcode)); /* purecov: inspected */
1807
(void) pthread_mutex_unlock(&LOCK_thread_count);
1810
void Session::reset_for_next_command()
1815
Those two lines below are theoretically unneeded as
1816
Session::cleanup_after_query() should take care of this already.
1818
auto_inc_intervals_in_cur_stmt_for_binlog.empty();
1820
is_fatal_error= false;
1821
server_status&= ~ (SERVER_MORE_RESULTS_EXISTS |
1822
SERVER_QUERY_NO_INDEX_USED |
1823
SERVER_QUERY_NO_GOOD_INDEX_USED);
1825
If in autocommit mode and not in a transaction, reset
1826
OPTION_STATUS_NO_TRANS_UPDATE | OPTION_KEEP_LOG to not get warnings
1827
in ha_rollback_trans() about some tables couldn't be rolled back.
1829
if (!(options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))
1831
options&= ~OPTION_KEEP_LOG;
1832
transaction.all.modified_non_trans_table= false;
1836
main_da.reset_diagnostics_area();
1837
total_warn_count=0; // Warnings for this query
1838
sent_row_count= examined_row_count= 0;
1842
Close all temporary tables created by 'CREATE TEMPORARY TABLE' for thread
1843
creates one DROP TEMPORARY Table binlog event for each pseudo-thread
1846
void Session::close_temporary_tables()
1851
if (!temporary_tables)
1854
for (table= temporary_tables; table; table= tmp_next)
1856
tmp_next= table->next;
1857
close_temporary(table, true, true);
1859
temporary_tables= NULL;
1863
/** Clear most status variables. */
1864
extern time_t flush_status_time;
1865
extern uint32_t max_used_connections;
1867
void Session::refresh_status()
1869
pthread_mutex_lock(&LOCK_status);
1871
/* Add thread's status variabes to global status */
1872
add_to_status(&global_status_var, &status_var);
1874
/* Reset thread's status variables */
1875
memset(&status_var, 0, sizeof(status_var));
1877
/* Reset some global variables */
1878
reset_status_vars();
1880
/* Reset the counters of all key caches (default and named). */
1881
process_key_caches(reset_key_cache_counters);
1882
flush_status_time= time((time_t*) 0);
1883
max_used_connections= 1; /* We set it to one, because we know we exist */
1884
pthread_mutex_unlock(&LOCK_status);
1887
#define extra_size sizeof(double)
1889
user_var_entry *Session::getVariable(LEX_STRING &name, bool create_if_not_exists)
1891
user_var_entry *entry= NULL;
1893
assert(name.length == strlen (name.str));
1894
entry= (user_var_entry*) hash_search(&user_vars, (unsigned char*) name.str, name.length);
1896
if ((entry == NULL) && create_if_not_exists)
1898
uint32_t size=ALIGN_SIZE(sizeof(user_var_entry))+name.length+1+extra_size;
1899
if (!hash_inited(&user_vars))
1901
if (!(entry = (user_var_entry*) malloc(size)))
1903
entry->name.str=(char*) entry+ ALIGN_SIZE(sizeof(user_var_entry))+
1905
entry->name.length=name.length;
1908
entry->update_query_id=0;
1909
entry->collation.set(NULL, DERIVATION_IMPLICIT);
1910
entry->unsigned_flag= 0;
1912
If we are here, we were called from a SET or a query which sets a
1913
variable. Imagine it is this:
1914
INSERT INTO t SELECT @a:=10, @a:=@a+1.
1915
Then when we have a Item_func_get_user_var (because of the @a+1) so we
1916
think we have to write the value of @a to the binlog. But before that,
1917
we have a Item_func_set_user_var to create @a (@a:=10), in this we mark
1918
the variable as "already logged" (line below) so that it won't be logged
1919
by Item_func_get_user_var (because that's not necessary).
1921
entry->used_query_id= query_id;
1922
entry->type=STRING_RESULT;
1923
memcpy(entry->name.str, name.str, name.length+1);
1924
if (my_hash_insert(&user_vars, (unsigned char*) entry))
1927
free((char*) entry);
1936
void Session::mark_temp_tables_as_free_for_reuse()
1938
for (Table *table= temporary_tables ; table ; table= table->next)
1940
if (table->query_id == query_id)
1943
table->file->ha_reset();
1948
void Session::mark_used_tables_as_free_for_reuse(Table *table)
1950
for (; table ; table= table->next)
1952
if (table->query_id == query_id)
1955
table->file->ha_reset();
1961
Unlocks tables and frees derived tables.
1962
Put all normal tables used by thread in free list.
1964
It will only close/mark as free for reuse tables opened by this
1965
substatement, it will also check if we are closing tables after
1966
execution of complete query (i.e. we are on upper level) and will
1967
leave prelocked mode if needed.
1969
void Session::close_thread_tables()
1974
We are assuming here that session->derived_tables contains ONLY derived
1975
tables for this substatement. i.e. instead of approach which uses
1976
query_id matching for determining which of the derived tables belong
1977
to this substatement we rely on the ability of substatements to
1978
save/restore session->derived_tables during their execution.
1980
TODO: Probably even better approach is to simply associate list of
1981
derived tables with (sub-)statement instead of thread and destroy
1982
them at the end of its execution.
1988
Close all derived tables generated in queries like
1989
SELECT * FROM (SELECT * FROM t1)
1991
for (table= derived_tables ; table ; table= next)
1994
table->free_tmp_table(this);
2000
Mark all temporary tables used by this statement as free for reuse.
2002
mark_temp_tables_as_free_for_reuse();
2004
Let us commit transaction for statement. Since in 5.0 we only have
2005
one statement transaction and don't allow several nested statement
2006
transactions this call will do nothing if we are inside of stored
2007
function or trigger (i.e. statement transaction is already active and
2008
does not belong to statement for which we do close_thread_tables()).
2009
TODO: This should be fixed in later releases.
2011
if (!(state_flags & Open_tables_state::BACKUPS_AVAIL))
2013
main_da.can_overwrite_status= true;
2014
ha_autocommit_or_rollback(this, is_error());
2015
main_da.can_overwrite_status= false;
2016
transaction.stmt.reset();
2022
For RBR we flush the pending event just before we unlock all the
2023
tables. This means that we are at the end of a topmost
2024
statement, so we ensure that the STMT_END_F flag is set on the
2025
pending event. For statements that are *inside* stored
2026
functions, the pending event will not be flushed: that will be
2027
handled either before writing a query log event (inside
2028
binlog_query()) or when preparing a pending event.
2030
mysql_unlock_tables(this, lock);
2034
Note that we need to hold LOCK_open while changing the
2035
open_tables list. Another thread may work on it.
2036
(See: remove_table_from_cache(), mysql_wait_completed_table())
2037
Closing a MERGE child before the parent would be fatal if the
2038
other thread tries to abort the MERGE lock in between.
2041
close_open_tables();
2044
void Session::close_tables_for_reopen(TableList **tables)
2047
If table list consists only from tables from prelocking set, table list
2048
for new attempt should be empty, so we have to update list's root pointer.
2050
if (lex->first_not_own_table() == *tables)
2052
lex->chop_off_not_own_tables();
2053
for (TableList *tmp= *tables; tmp; tmp= tmp->next_global)
2055
close_thread_tables();
2058
int Session::open_and_lock_tables(TableList *tables)
2065
if (open_tables_from_list(&tables, &counter, 0))
2068
if (!lock_tables(this, tables, counter, &need_reopen))
2072
close_tables_for_reopen(&tables);
2074
if ((mysql_handle_derived(lex, &mysql_derived_prepare) ||
2075
(fill_derived_tables() &&
2076
mysql_handle_derived(lex, &mysql_derived_filling))))
2077
return 1; /* purecov: inspected */
2082
bool Session::open_normal_and_derived_tables(TableList *tables, uint32_t flags)
2085
assert(!(fill_derived_tables()));
2086
if (open_tables_from_list(&tables, &counter, flags) ||
2087
mysql_handle_derived(lex, &mysql_derived_prepare))
2088
return true; /* purecov: inspected */