forked from twitter-forks/mysql
-
Notifications
You must be signed in to change notification settings - Fork 1
/
sql_db.cc
1867 lines (1555 loc) · 54.6 KB
/
sql_db.cc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
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 */
/* create and drop of databases */
#include "my_global.h" /* NO_EMBEDDED_ACCESS_CHECKS */
#include "sql_priv.h"
#include "unireg.h"
#include "sql_db.h"
#include "sql_cache.h" // query_cache_*
#include "lock.h" // lock_schema_name
#include "sql_table.h" // build_table_filename,
// filename_to_tablename
#include "sql_rename.h" // mysql_rename_tables
#include "sql_acl.h" // SELECT_ACL, DB_ACLS,
// acl_get, check_grant_db
#include "log_event.h" // Query_log_event
#include "sql_base.h" // lock_table_names, tdc_remove_table
#include "sql_handler.h" // mysql_ha_rm_tables
#include <mysys_err.h>
#include "sp.h"
#include "events.h"
#include <my_dir.h>
#include <m_ctype.h>
#include "log.h"
#ifdef __WIN__
#include <direct.h>
#endif
#include "debug_sync.h"
#define MAX_DROP_TABLE_Q_LEN 1024
const char *del_exts[]= {".frm", ".BAK", ".TMD",".opt", NullS};
static TYPELIB deletable_extentions=
{array_elements(del_exts)-1,"del_exts", del_exts, NULL};
static bool find_db_tables_and_rm_known_files(THD *thd, MY_DIR *dirp,
const char *db,
const char *path,
TABLE_LIST **tables,
bool *found_other_files);
long mysql_rm_arc_files(THD *thd, MY_DIR *dirp, const char *org_path);
static my_bool rm_dir_w_symlink(const char *org_path, my_bool send_error);
static void mysql_change_db_impl(THD *thd,
LEX_STRING *new_db_name,
ulong new_db_access,
CHARSET_INFO *new_db_charset);
/* Database options hash */
static HASH dboptions;
static my_bool dboptions_init= 0;
static mysql_rwlock_t LOCK_dboptions;
/* Structure for database options */
typedef struct my_dbopt_st
{
char *name; /* Database name */
uint name_length; /* Database length name */
CHARSET_INFO *charset; /* Database default character set */
} my_dbopt_t;
/*
Function we use in the creation of our hash to get key.
*/
extern "C" uchar* dboptions_get_key(my_dbopt_t *opt, size_t *length,
my_bool not_used);
uchar* dboptions_get_key(my_dbopt_t *opt, size_t *length,
my_bool not_used __attribute__((unused)))
{
*length= opt->name_length;
return (uchar*) opt->name;
}
/*
Helper function to write a query to binlog used by mysql_rm_db()
*/
static inline int write_to_binlog(THD *thd, char *query, uint q_len,
char *db, uint db_len)
{
Query_log_event qinfo(thd, query, q_len, FALSE, TRUE, FALSE, 0);
qinfo.db= db;
qinfo.db_len= db_len;
return mysql_bin_log.write(&qinfo);
}
/*
Function to free dboptions hash element
*/
extern "C" void free_dbopt(void *dbopt);
void free_dbopt(void *dbopt)
{
my_free(dbopt);
}
#ifdef HAVE_PSI_INTERFACE
static PSI_rwlock_key key_rwlock_LOCK_dboptions;
static PSI_rwlock_info all_database_names_rwlocks[]=
{
{ &key_rwlock_LOCK_dboptions, "LOCK_dboptions", PSI_FLAG_GLOBAL}
};
static void init_database_names_psi_keys(void)
{
const char* category= "sql";
int count;
if (PSI_server == NULL)
return;
count= array_elements(all_database_names_rwlocks);
PSI_server->register_rwlock(category, all_database_names_rwlocks, count);
}
#endif
/**
Initialize database option cache.
@note Must be called before any other database function is called.
@retval 0 ok
@retval 1 Fatal error
*/
bool my_dboptions_cache_init(void)
{
#ifdef HAVE_PSI_INTERFACE
init_database_names_psi_keys();
#endif
bool error= 0;
mysql_rwlock_init(key_rwlock_LOCK_dboptions, &LOCK_dboptions);
if (!dboptions_init)
{
dboptions_init= 1;
error= my_hash_init(&dboptions, lower_case_table_names ?
&my_charset_bin : system_charset_info,
32, 0, 0, (my_hash_get_key) dboptions_get_key,
free_dbopt,0);
}
return error;
}
/**
Free database option hash and locked databases hash.
*/
void my_dboptions_cache_free(void)
{
if (dboptions_init)
{
dboptions_init= 0;
my_hash_free(&dboptions);
mysql_rwlock_destroy(&LOCK_dboptions);
}
}
/**
Cleanup cached options.
*/
void my_dbopt_cleanup(void)
{
mysql_rwlock_wrlock(&LOCK_dboptions);
my_hash_free(&dboptions);
my_hash_init(&dboptions, lower_case_table_names ?
&my_charset_bin : system_charset_info,
32, 0, 0, (my_hash_get_key) dboptions_get_key,
free_dbopt,0);
mysql_rwlock_unlock(&LOCK_dboptions);
}
/*
Find database options in the hash.
DESCRIPTION
Search a database options in the hash, usings its path.
Fills "create" on success.
RETURN VALUES
0 on success.
1 on error.
*/
static my_bool get_dbopt(const char *dbname, HA_CREATE_INFO *create)
{
my_dbopt_t *opt;
uint length;
my_bool error= 1;
length= (uint) strlen(dbname);
mysql_rwlock_rdlock(&LOCK_dboptions);
if ((opt= (my_dbopt_t*) my_hash_search(&dboptions, (uchar*) dbname, length)))
{
create->default_table_charset= opt->charset;
error= 0;
}
mysql_rwlock_unlock(&LOCK_dboptions);
return error;
}
/*
Writes database options into the hash.
DESCRIPTION
Inserts database options into the hash, or updates
options if they are already in the hash.
RETURN VALUES
0 on success.
1 on error.
*/
static my_bool put_dbopt(const char *dbname, HA_CREATE_INFO *create)
{
my_dbopt_t *opt;
uint length;
my_bool error= 0;
DBUG_ENTER("put_dbopt");
length= (uint) strlen(dbname);
mysql_rwlock_wrlock(&LOCK_dboptions);
if (!(opt= (my_dbopt_t*) my_hash_search(&dboptions, (uchar*) dbname,
length)))
{
/* Options are not in the hash, insert them */
char *tmp_name;
if (!my_multi_malloc(MYF(MY_WME | MY_ZEROFILL),
&opt, (uint) sizeof(*opt), &tmp_name, (uint) length+1,
NullS))
{
error= 1;
goto end;
}
opt->name= tmp_name;
strmov(opt->name, dbname);
opt->name_length= length;
if ((error= my_hash_insert(&dboptions, (uchar*) opt)))
{
my_free(opt);
goto end;
}
}
/* Update / write options in hash */
opt->charset= create->default_table_charset;
end:
mysql_rwlock_unlock(&LOCK_dboptions);
DBUG_RETURN(error);
}
/*
Deletes database options from the hash.
*/
static void del_dbopt(const char *path)
{
my_dbopt_t *opt;
mysql_rwlock_wrlock(&LOCK_dboptions);
if ((opt= (my_dbopt_t *)my_hash_search(&dboptions, (const uchar*) path,
strlen(path))))
my_hash_delete(&dboptions, (uchar*) opt);
mysql_rwlock_unlock(&LOCK_dboptions);
}
/*
Create database options file:
DESCRIPTION
Currently database default charset is only stored there.
RETURN VALUES
0 ok
1 Could not create file or write to it. Error sent through my_error()
*/
static bool write_db_opt(THD *thd, const char *path, HA_CREATE_INFO *create)
{
register File file;
char buf[256]; // Should be enough for one option
bool error=1;
if (!create->default_table_charset)
create->default_table_charset= thd->variables.collation_server;
if (put_dbopt(path, create))
return 1;
if ((file= mysql_file_create(key_file_dbopt, path, CREATE_MODE,
O_RDWR | O_TRUNC, MYF(MY_WME))) >= 0)
{
ulong length;
length= (ulong) (strxnmov(buf, sizeof(buf)-1, "default-character-set=",
create->default_table_charset->csname,
"\ndefault-collation=",
create->default_table_charset->name,
"\n", NullS) - buf);
/* Error is written by mysql_file_write */
if (!mysql_file_write(file, (uchar*) buf, length, MYF(MY_NABP+MY_WME)))
error=0;
mysql_file_close(file, MYF(0));
}
return error;
}
/*
Load database options file
load_db_opt()
path Path for option file
create Where to store the read options
DESCRIPTION
RETURN VALUES
0 File found
1 No database file or could not open it
*/
bool load_db_opt(THD *thd, const char *path, HA_CREATE_INFO *create)
{
File file;
char buf[256];
DBUG_ENTER("load_db_opt");
bool error=1;
uint nbytes;
bzero((char*) create,sizeof(*create));
create->default_table_charset= thd->variables.collation_server;
/* Check if options for this database are already in the hash */
if (!get_dbopt(path, create))
DBUG_RETURN(0);
/* Otherwise, load options from the .opt file */
if ((file= mysql_file_open(key_file_dbopt,
path, O_RDONLY | O_SHARE, MYF(0))) < 0)
goto err1;
IO_CACHE cache;
if (init_io_cache(&cache, file, IO_SIZE, READ_CACHE, 0, 0, MYF(0)))
goto err2;
while ((int) (nbytes= my_b_gets(&cache, (char*) buf, sizeof(buf))) > 0)
{
char *pos= buf+nbytes-1;
/* Remove end space and control characters */
while (pos > buf && !my_isgraph(&my_charset_latin1, pos[-1]))
pos--;
*pos=0;
if ((pos= strchr(buf, '=')))
{
if (!strncmp(buf,"default-character-set", (pos-buf)))
{
/*
Try character set name, and if it fails
try collation name, probably it's an old
4.1.0 db.opt file, which didn't have
separate default-character-set and
default-collation commands.
*/
if (!(create->default_table_charset=
get_charset_by_csname(pos+1, MY_CS_PRIMARY, MYF(0))) &&
!(create->default_table_charset=
get_charset_by_name(pos+1, MYF(0))))
{
sql_print_error("Error while loading database options: '%s':",path);
sql_print_error(ER(ER_UNKNOWN_CHARACTER_SET),pos+1);
create->default_table_charset= default_charset_info;
}
}
else if (!strncmp(buf,"default-collation", (pos-buf)))
{
if (!(create->default_table_charset= get_charset_by_name(pos+1,
MYF(0))))
{
sql_print_error("Error while loading database options: '%s':",path);
sql_print_error(ER(ER_UNKNOWN_COLLATION),pos+1);
create->default_table_charset= default_charset_info;
}
}
}
}
/*
Put the loaded value into the hash.
Note that another thread could've added the same
entry to the hash after we called get_dbopt(),
but it's not an error, as put_dbopt() takes this
possibility into account.
*/
error= put_dbopt(path, create);
end_io_cache(&cache);
err2:
mysql_file_close(file, MYF(0));
err1:
DBUG_RETURN(error);
}
/*
Retrieve database options by name. Load database options file or fetch from
cache.
SYNOPSIS
load_db_opt_by_name()
db_name Database name
db_create_info Where to store the database options
DESCRIPTION
load_db_opt_by_name() is a shortcut for load_db_opt().
NOTE
Although load_db_opt_by_name() (and load_db_opt()) returns status of
the operation, it is useless usually and should be ignored. The problem
is that there are 1) system databases ("mysql") and 2) virtual
databases ("information_schema"), which do not contain options file.
So, load_db_opt[_by_name]() returns FALSE for these databases, but this
is not an error.
load_db_opt[_by_name]() clears db_create_info structure in any case, so
even on failure it contains valid data. So, common use case is just
call load_db_opt[_by_name]() without checking return value and use
db_create_info right after that.
RETURN VALUES (read NOTE!)
FALSE Success
TRUE Failed to retrieve options
*/
bool load_db_opt_by_name(THD *thd, const char *db_name,
HA_CREATE_INFO *db_create_info)
{
char db_opt_path[FN_REFLEN + 1];
/*
Pass an empty file name, and the database options file name as extension
to avoid table name to file name encoding.
*/
(void) build_table_filename(db_opt_path, sizeof(db_opt_path) - 1,
db_name, "", MY_DB_OPT_FILE, 0);
return load_db_opt(thd, db_opt_path, db_create_info);
}
/**
Return default database collation.
@param thd Thread context.
@param db_name Database name.
@return CHARSET_INFO object. The operation always return valid character
set, even if the database does not exist.
*/
CHARSET_INFO *get_default_db_collation(THD *thd, const char *db_name)
{
HA_CREATE_INFO db_info;
if (thd->db != NULL && strcmp(db_name, thd->db) == 0)
return thd->db_charset;
load_db_opt_by_name(thd, db_name, &db_info);
/*
NOTE: even if load_db_opt_by_name() fails,
db_info.default_table_charset contains valid character set
(collation_server). We should not fail if load_db_opt_by_name() fails,
because it is valid case. If a database has been created just by
"mkdir", it does not contain db.opt file, but it is valid database.
*/
return db_info.default_table_charset;
}
/*
Create a database
SYNOPSIS
mysql_create_db()
thd Thread handler
db Name of database to create
Function assumes that this is already validated.
create_info Database create options (like character set)
silent Used by replication when internally creating a database.
In this case the entry should not be logged.
SIDE-EFFECTS
1. Report back to client that command succeeded (my_ok)
2. Report errors to client
3. Log event to binary log
(The 'silent' flags turns off 1 and 3.)
RETURN VALUES
FALSE ok
TRUE Error
*/
int mysql_create_db(THD *thd, char *db, HA_CREATE_INFO *create_info,
bool silent)
{
char path[FN_REFLEN+16];
char tmp_query[FN_REFLEN+16];
long result= 1;
int error= 0;
MY_STAT stat_info;
uint create_options= create_info ? create_info->options : 0;
uint path_len;
DBUG_ENTER("mysql_create_db");
/* do not create 'information_schema' db */
if (is_infoschema_db(db))
{
my_error(ER_DB_CREATE_EXISTS, MYF(0), db);
DBUG_RETURN(-1);
}
if (lock_schema_name(thd, db))
DBUG_RETURN(-1);
/* Check directory */
path_len= build_table_filename(path, sizeof(path) - 1, db, "", "", 0);
path[path_len-1]= 0; // Remove last '/' from path
if (mysql_file_stat(key_file_misc, path, &stat_info, MYF(0)))
{
if (!(create_options & HA_LEX_CREATE_IF_NOT_EXISTS))
{
my_error(ER_DB_CREATE_EXISTS, MYF(0), db);
error= -1;
goto exit;
}
push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
ER_DB_CREATE_EXISTS, ER(ER_DB_CREATE_EXISTS), db);
error= 0;
goto not_silent;
}
else
{
if (my_errno != ENOENT)
{
my_error(EE_STAT, MYF(0), path, my_errno);
goto exit;
}
if (my_mkdir(path,0777,MYF(0)) < 0)
{
my_error(ER_CANT_CREATE_DB, MYF(0), db, my_errno);
error= -1;
goto exit;
}
}
path[path_len-1]= FN_LIBCHAR;
strmake(path+path_len, MY_DB_OPT_FILE, sizeof(path)-path_len-1);
if (write_db_opt(thd, path, create_info))
{
/*
Could not create options file.
Restore things to beginning.
*/
path[path_len]= 0;
if (rmdir(path) >= 0)
{
error= -1;
goto exit;
}
/*
We come here when we managed to create the database, but not the option
file. In this case it's best to just continue as if nothing has
happened. (This is a very unlikely senario)
*/
thd->clear_error();
}
not_silent:
if (!silent)
{
char *query;
uint query_length;
if (!thd->query()) // Only in replication
{
query= tmp_query;
query_length= (uint) (strxmov(tmp_query,"create database `",
db, "`", NullS) - tmp_query);
}
else
{
query= thd->query();
query_length= thd->query_length();
}
ha_binlog_log_query(thd, 0, LOGCOM_CREATE_DB,
query, query_length,
db, "");
if (mysql_bin_log.is_open())
{
int errcode= query_error_code(thd, TRUE);
Query_log_event qinfo(thd, query, query_length, FALSE, TRUE,
/* suppress_use */ TRUE, errcode);
/*
Write should use the database being created as the "current
database" and not the threads current database, which is the
default. If we do not change the "current database" to the
database being created, the CREATE statement will not be
replicated when using --binlog-do-db to select databases to be
replicated.
An example (--binlog-do-db=sisyfos):
CREATE DATABASE bob; # Not replicated
USE bob; # 'bob' is the current database
CREATE DATABASE sisyfos; # Not replicated since 'bob' is
# current database.
USE sisyfos; # Will give error on slave since
# database does not exist.
*/
qinfo.db = db;
qinfo.db_len = strlen(db);
/*
These DDL methods and logging are protected with the exclusive
metadata lock on the schema
*/
if (mysql_bin_log.write(&qinfo))
{
error= -1;
goto exit;
}
}
my_ok(thd, result);
}
exit:
DBUG_RETURN(error);
}
/* db-name is already validated when we come here */
bool mysql_alter_db(THD *thd, const char *db, HA_CREATE_INFO *create_info)
{
char path[FN_REFLEN+16];
long result=1;
int error= 0;
DBUG_ENTER("mysql_alter_db");
if (lock_schema_name(thd, db))
DBUG_RETURN(TRUE);
/*
Recreate db options file: /dbpath/.db.opt
We pass MY_DB_OPT_FILE as "extension" to avoid
"table name to file name" encoding.
*/
build_table_filename(path, sizeof(path) - 1, db, "", MY_DB_OPT_FILE, 0);
if ((error=write_db_opt(thd, path, create_info)))
goto exit;
/* Change options if current database is being altered. */
if (thd->db && !strcmp(thd->db,db))
{
thd->db_charset= create_info->default_table_charset ?
create_info->default_table_charset :
thd->variables.collation_server;
thd->variables.collation_database= thd->db_charset;
}
ha_binlog_log_query(thd, 0, LOGCOM_ALTER_DB,
thd->query(), thd->query_length(),
db, "");
if (mysql_bin_log.is_open())
{
int errcode= query_error_code(thd, TRUE);
Query_log_event qinfo(thd, thd->query(), thd->query_length(), FALSE, TRUE,
/* suppress_use */ TRUE, errcode);
/*
Write should use the database being created as the "current
database" and not the threads current database, which is the
default.
*/
qinfo.db = db;
qinfo.db_len = strlen(db);
/*
These DDL methods and logging are protected with the exclusive
metadata lock on the schema.
*/
if ((error= mysql_bin_log.write(&qinfo)))
goto exit;
}
my_ok(thd, result);
exit:
DBUG_RETURN(error);
}
/**
Drop all tables, routines and events in a database and the database itself.
@param thd Thread handle
@param db Database name in the case given by user
It's already validated and set to lower case
(if needed) when we come here
@param if_exists Don't give error if database doesn't exists
@param silent Don't write the statement to the binary log and don't
send ok packet to the client
@retval false OK (Database dropped)
@retval true Error
*/
bool mysql_rm_db(THD *thd,char *db,bool if_exists, bool silent)
{
ulong deleted_tables= 0;
bool error= true;
char path[FN_REFLEN+16];
MY_DIR *dirp;
uint length;
bool found_other_files= false;
TABLE_LIST *tables= NULL;
TABLE_LIST *table;
Drop_table_error_handler err_handler;
DBUG_ENTER("mysql_rm_db");
if (lock_schema_name(thd, db))
DBUG_RETURN(true);
length= build_table_filename(path, sizeof(path) - 1, db, "", "", 0);
strmov(path+length, MY_DB_OPT_FILE); // Append db option file name
del_dbopt(path); // Remove dboption hash entry
path[length]= '\0'; // Remove file name
/* See if the directory exists */
if (!(dirp= my_dir(path,MYF(MY_DONT_SORT))))
{
if (!if_exists)
{
my_error(ER_DB_DROP_EXISTS, MYF(0), db);
DBUG_RETURN(true);
}
else
{
push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
ER_DB_DROP_EXISTS, ER(ER_DB_DROP_EXISTS), db);
error= false;
goto update_binlog;
}
}
if (find_db_tables_and_rm_known_files(thd, dirp, db, path, &tables,
&found_other_files))
goto exit;
/*
Disable drop of enabled log tables, must be done before name locking.
This check is only needed if we are dropping the "mysql" database.
*/
if ((my_strcasecmp(system_charset_info, MYSQL_SCHEMA_NAME.str, db) == 0))
{
for (table= tables; table; table= table->next_local)
{
if (check_if_log_table(table->db_length, table->db,
table->table_name_length, table->table_name, true))
{
my_error(ER_BAD_LOG_STATEMENT, MYF(0), "DROP");
goto exit;
}
}
}
/* Lock all tables and stored routines about to be dropped. */
if (lock_table_names(thd, tables, NULL, thd->variables.lock_wait_timeout,
MYSQL_OPEN_SKIP_TEMPORARY) ||
lock_db_routines(thd, db))
goto exit;
/* mysql_ha_rm_tables() requires a non-null TABLE_LIST. */
if (tables)
mysql_ha_rm_tables(thd, tables);
for (table= tables; table; table= table->next_local)
{
tdc_remove_table(thd, TDC_RT_REMOVE_ALL, table->db, table->table_name,
false);
deleted_tables++;
}
thd->push_internal_handler(&err_handler);
if (!thd->killed &&
!(tables &&
mysql_rm_table_no_locks(thd, tables, true, false, true, true)))
{
/*
We temporarily disable the binary log while dropping the objects
in the database. Since the DROP DATABASE statement is always
replicated as a statement, execution of it will drop all objects
in the database on the slave as well, so there is no need to
replicate the removal of the individual objects in the database
as well.
This is more of a safety precaution, since normally no objects
should be dropped while the database is being cleaned, but in
the event that a change in the code to remove other objects is
made, these drops should still not be logged.
Notice that the binary log have to be enabled over the call to
ha_drop_database(), since NDB otherwise detects the binary log
as disabled and will not log the drop database statement on any
other connected server.
*/
ha_drop_database(path);
tmp_disable_binlog(thd);
query_cache_invalidate1(db);
(void) sp_drop_db_routines(thd, db); /* @todo Do not ignore errors */
#ifdef HAVE_EVENT_SCHEDULER
Events::drop_schema_events(thd, db);
#endif
reenable_binlog(thd);
/*
If the directory is a symbolic link, remove the link first, then
remove the directory the symbolic link pointed at
*/
if (found_other_files)
my_error(ER_DB_DROP_RMDIR, MYF(0), path, EEXIST);
else
error= rm_dir_w_symlink(path, true);
}
thd->pop_internal_handler();
update_binlog:
if (!silent && !error)
{
const char *query;
ulong query_length;
if (!thd->query())
{
/* The client used the old obsolete mysql_drop_db() call */
query= path;
query_length= (uint) (strxmov(path, "drop database `", db, "`",
NullS) - path);
}
else
{
query= thd->query();
query_length= thd->query_length();
}
if (mysql_bin_log.is_open())
{
int errcode= query_error_code(thd, TRUE);
Query_log_event qinfo(thd, query, query_length, FALSE, TRUE,
/* suppress_use */ TRUE, errcode);
/*
Write should use the database being created as the "current
database" and not the threads current database, which is the
default.
*/
qinfo.db = db;
qinfo.db_len = strlen(db);
/*
These DDL methods and logging are protected with the exclusive
metadata lock on the schema.
*/
if (mysql_bin_log.write(&qinfo))
{
error= true;
goto exit;
}
}
thd->clear_error();
thd->server_status|= SERVER_STATUS_DB_DROPPED;
my_ok(thd, deleted_tables);
}
else if (mysql_bin_log.is_open() && !silent)
{
char *query, *query_pos, *query_end, *query_data_start;
TABLE_LIST *tbl;
uint db_len;
if (!(query= (char*) thd->alloc(MAX_DROP_TABLE_Q_LEN)))
goto exit; /* not much else we can do */
query_pos= query_data_start= strmov(query,"drop table ");
query_end= query + MAX_DROP_TABLE_Q_LEN;
db_len= strlen(db);
for (tbl= tables; tbl; tbl= tbl->next_local)
{
uint tbl_name_len;
bool exists;
// Only write drop table to the binlog for tables that no longer exist.
if (check_if_table_exists(thd, tbl, &exists))
{
error= true;
goto exit;
}
if (exists)
continue;
/* 3 for the quotes and the comma*/
tbl_name_len= strlen(tbl->table_name) + 3;
if (query_pos + tbl_name_len + 1 >= query_end)
{
/*
These DDL methods and logging are protected with the exclusive
metadata lock on the schema.
*/
if (write_to_binlog(thd, query, query_pos -1 - query, db, db_len))
{
error= true;
goto exit;
}
query_pos= query_data_start;
}
*query_pos++ = '`';
query_pos= strmov(query_pos,tbl->table_name);
*query_pos++ = '`';
*query_pos++ = ',';
}
if (query_pos != query_data_start)
{
/*
These DDL methods and logging are protected with the exclusive
metadata lock on the schema.
*/
if (write_to_binlog(thd, query, query_pos -1 - query, db, db_len))
{
error= true;
goto exit;
}
}
}
exit:
/*
If this database was the client's selected database, we silently
change the client's selected database to nothing (to have an empty
SELECT DATABASE() in the future). For this we free() thd->db and set
it to 0.
*/
if (thd->db && !strcmp(thd->db, db) && !error)
mysql_change_db_impl(thd, NULL, 0, thd->variables.collation_server);
my_dirend(dirp);
DBUG_RETURN(error);
}