… | |
… | |
24 | db_put $db, undef, "key", "data", 0, sub { |
24 | db_put $db, undef, "key", "data", 0, sub { |
25 | db_del $db, undef, "key"; |
25 | db_del $db, undef, "key"; |
26 | }; |
26 | }; |
27 | db_sync $db; |
27 | db_sync $db; |
28 | |
28 | |
29 | # automatic result processing with AnyEvent: |
29 | # when you also use Coro, management is easy: |
30 | our $FH; open $FH, "<&=" . BDB::poll_fileno; |
30 | use Coro::BDB; |
31 | our $WATCHER = AnyEvent->io (fh => $FH, poll => 'r', cb => \&BDB::poll_cb); |
31 | |
|
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32 | # automatic event loop intergration with AnyEvent: |
|
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33 | use AnyEvent::BDB; |
32 | |
34 | |
33 | # automatic result processing with EV: |
35 | # automatic result processing with EV: |
34 | my $WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb; |
36 | my $WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb; |
35 | |
37 | |
36 | # with Glib: |
38 | # with Glib: |
… | |
… | |
107 | use strict 'vars'; |
109 | use strict 'vars'; |
108 | |
110 | |
109 | use base 'Exporter'; |
111 | use base 'Exporter'; |
110 | |
112 | |
111 | BEGIN { |
113 | BEGIN { |
112 | our $VERSION = '1.4'; |
114 | our $VERSION = '1.5'; |
113 | |
115 | |
114 | our @BDB_REQ = qw( |
116 | our @BDB_REQ = qw( |
115 | db_env_open db_env_close db_env_txn_checkpoint db_env_lock_detect |
117 | db_env_open db_env_close db_env_txn_checkpoint db_env_lock_detect |
116 | db_env_memp_sync db_env_memp_trickle |
118 | db_env_memp_sync db_env_memp_trickle db_env_dbrename db_env_dbremove |
117 | db_open db_close db_compact db_sync db_upgrade |
119 | db_open db_close db_compact db_sync db_upgrade |
118 | db_put db_get db_pget db_del db_key_range |
120 | db_put db_get db_pget db_del db_key_range |
119 | db_txn_commit db_txn_abort db_txn_finish |
121 | db_txn_commit db_txn_abort db_txn_finish |
120 | db_c_close db_c_count db_c_put db_c_get db_c_pget db_c_del |
122 | db_c_close db_c_count db_c_put db_c_get db_c_pget db_c_del |
121 | db_sequence_open db_sequence_close |
123 | db_sequence_open db_sequence_close |
… | |
… | |
131 | |
133 | |
132 | require XSLoader; |
134 | require XSLoader; |
133 | XSLoader::load ("BDB", $VERSION); |
135 | XSLoader::load ("BDB", $VERSION); |
134 | } |
136 | } |
135 | |
137 | |
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138 | =head2 WIN32 FILENAMES/DATABASE NAME MESS |
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139 | |
|
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140 | Perl on Win32 supports only ASCII filenames (the reason is that it abuses |
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141 | an internal flag to store wether a filename is Unicode or ANSI, but that |
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142 | flag is used for somethign else in the perl core, so there is no way to |
|
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143 | detect wether a filename is ANSI or Unicode-encoded). The BDB module |
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144 | tries to work around this issue by assuming that the filename is an ANSI |
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145 | filename and BDB was built for unicode support. |
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146 | |
136 | =head2 BERKELEYDB FUNCTIONS |
147 | =head2 BERKELEYDB FUNCTIONS |
137 | |
148 | |
138 | All of these are functions. The create functions simply return a new |
149 | All of these are functions. The create functions simply return a new |
139 | object and never block. All the remaining functions all take an optional |
150 | object and never block. All the remaining functions take an optional |
140 | callback as last argument. If it is missing, then the function will be |
151 | callback as last argument. If it is missing, then the function will be |
141 | executed synchronously. In both cases, C<$!> will reflect the return value |
152 | executed synchronously. In both cases, C<$!> will reflect the return value |
142 | of the function. |
153 | of the function. |
143 | |
154 | |
144 | BDB functions that cannot block (mostly functions that manipulate |
155 | BDB functions that cannot block (mostly functions that manipulate |
145 | settings) are method calls on the relevant objects, so the rule of thumb |
156 | settings) are method calls on the relevant objects, so the rule of thumb |
146 | is: if its a method, its not blocking, if its a function, it takes a |
157 | is: if it's a method, it's not blocking, if it's a function, it takes a |
147 | callback as last argument. |
158 | callback as last argument. |
148 | |
159 | |
149 | In the following, C<$int> signifies an integer return value, |
160 | In the following, C<$int> signifies an integer return value, |
150 | C<octetstring> is a "binary string" (i.e. a perl string with no character |
161 | C<bdb_filename> is a "filename" (octets on unix, madness on windows), |
151 | indices >255), C<U32> is an unsigned 32 bit integer, C<int> is some |
162 | C<U32> is an unsigned 32 bit integer, C<int> is some integer, C<NV> is a |
152 | integer, C<NV> is a floating point value. |
163 | floating point value. |
153 | |
164 | |
154 | The C<SV *> types are generic perl scalars (for input and output of data |
165 | The C<SV *> types are generic perl scalars (for input and output of data |
155 | values), and the C<SV *callback> is the optional callback function to call |
166 | values), and the C<SV *callback> is the optional callback function to call |
156 | when the request is completed. |
167 | when the request is completed. |
157 | |
168 | |
… | |
… | |
165 | Functions in the BDB namespace, exported by default: |
176 | Functions in the BDB namespace, exported by default: |
166 | |
177 | |
167 | $env = db_env_create (U32 env_flags = 0) |
178 | $env = db_env_create (U32 env_flags = 0) |
168 | flags: RPCCLIENT |
179 | flags: RPCCLIENT |
169 | |
180 | |
170 | db_env_open (DB_ENV *env, octetstring db_home, U32 open_flags, int mode, SV *callback = &PL_sv_undef) |
181 | db_env_open (DB_ENV *env, bdb_filename db_home, U32 open_flags, int mode, SV *callback = &PL_sv_undef) |
171 | open_flags: INIT_CDB INIT_LOCK INIT_LOG INIT_MPOOL INIT_REP INIT_TXN RECOVER RECOVER_FATAL USE_ENVIRON USE_ENVIRON_ROOT CREATE LOCKDOWN PRIVATE REGISTER SYSTEM_MEM |
182 | open_flags: INIT_CDB INIT_LOCK INIT_LOG INIT_MPOOL INIT_REP INIT_TXN RECOVER RECOVER_FATAL USE_ENVIRON USE_ENVIRON_ROOT CREATE LOCKDOWN PRIVATE REGISTER SYSTEM_MEM |
172 | db_env_close (DB_ENV *env, U32 flags = 0, SV *callback = &PL_sv_undef) |
183 | db_env_close (DB_ENV *env, U32 flags = 0, SV *callback = &PL_sv_undef) |
173 | db_env_txn_checkpoint (DB_ENV *env, U32 kbyte = 0, U32 min = 0, U32 flags = 0, SV *callback = &PL_sv_undef) |
184 | db_env_txn_checkpoint (DB_ENV *env, U32 kbyte = 0, U32 min = 0, U32 flags = 0, SV *callback = &PL_sv_undef) |
174 | flags: FORCE |
185 | flags: FORCE |
175 | db_env_lock_detect (DB_ENV *env, U32 flags = 0, U32 atype = DB_LOCK_DEFAULT, SV *dummy = 0, SV *callback = &PL_sv_undef) |
186 | db_env_lock_detect (DB_ENV *env, U32 flags = 0, U32 atype = DB_LOCK_DEFAULT, SV *dummy = 0, SV *callback = &PL_sv_undef) |
176 | atype: LOCK_DEFAULT LOCK_EXPIRE LOCK_MAXLOCKS LOCK_MAXWRITE LOCK_MINLOCKS LOCK_MINWRITE LOCK_OLDEST LOCK_RANDOM LOCK_YOUNGEST |
187 | atype: LOCK_DEFAULT LOCK_EXPIRE LOCK_MAXLOCKS LOCK_MAXWRITE LOCK_MINLOCKS LOCK_MINWRITE LOCK_OLDEST LOCK_RANDOM LOCK_YOUNGEST |
177 | db_env_memp_sync (DB_ENV *env, SV *dummy = 0, SV *callback = &PL_sv_undef) |
188 | db_env_memp_sync (DB_ENV *env, SV *dummy = 0, SV *callback = &PL_sv_undef) |
178 | db_env_memp_trickle (DB_ENV *env, int percent, SV *dummy = 0, SV *callback = &PL_sv_undef) |
189 | db_env_memp_trickle (DB_ENV *env, int percent, SV *dummy = 0, SV *callback = &PL_sv_undef) |
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190 | db_env_dbremove (DB_ENV *env, DB_TXN_ornull *txnid, bdb_filename file, bdb_filename database, U32 flags = 0, SV *callback = &PL_sv_undef) |
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191 | db_env_dbrename (DB_ENV *env, DB_TXN_ornull *txnid, bdb_filename file, bdb_filename database, bdb_filename newname, U32 flags = 0, SV *callback = &PL_sv_undef) |
179 | |
192 | |
180 | $db = db_create (DB_ENV *env = 0, U32 flags = 0) |
193 | $db = db_create (DB_ENV *env = 0, U32 flags = 0) |
181 | flags: XA_CREATE |
194 | flags: XA_CREATE |
182 | |
195 | |
183 | db_open (DB *db, DB_TXN_ornull *txnid, octetstring file, octetstring database, int type, U32 flags, int mode, SV *callback = &PL_sv_undef) |
196 | db_open (DB *db, DB_TXN_ornull *txnid, bdb_filename file, bdb_filename database, int type, U32 flags, int mode, SV *callback = &PL_sv_undef) |
184 | flags: AUTO_COMMIT CREATE EXCL MULTIVERSION NOMMAP RDONLY READ_UNCOMMITTED THREAD TRUNCATE |
197 | flags: AUTO_COMMIT CREATE EXCL MULTIVERSION NOMMAP RDONLY READ_UNCOMMITTED THREAD TRUNCATE |
185 | db_close (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef) |
198 | db_close (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef) |
186 | flags: DB_NOSYNC |
199 | flags: DB_NOSYNC |
187 | db_upgrade (DB *db, octetstring file, U32 flags = 0, SV *callback = &PL_sv_undef) |
200 | db_upgrade (DB *db, bdb_filename file, U32 flags = 0, SV *callback = &PL_sv_undef) |
188 | db_compact (DB *db, DB_TXN_ornull *txn = 0, SV *start = 0, SV *stop = 0, SV *unused1 = 0, U32 flags = DB_FREE_SPACE, SV *unused2 = 0, SV *callback = &PL_sv_undef) |
201 | db_compact (DB *db, DB_TXN_ornull *txn = 0, SV *start = 0, SV *stop = 0, SV *unused1 = 0, U32 flags = DB_FREE_SPACE, SV *unused2 = 0, SV *callback = &PL_sv_undef) |
189 | flags: FREELIST_ONLY FREE_SPACE |
202 | flags: FREELIST_ONLY FREE_SPACE |
190 | db_sync (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef) |
203 | db_sync (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef) |
191 | db_key_range (DB *db, DB_TXN_ornull *txn, SV *key, SV *key_range, U32 flags = 0, SV *callback = &PL_sv_undef) |
204 | db_key_range (DB *db, DB_TXN_ornull *txn, SV *key, SV *key_range, U32 flags = 0, SV *callback = &PL_sv_undef) |
192 | db_put (DB *db, DB_TXN_ornull *txn, SV *key, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef) |
205 | db_put (DB *db, DB_TXN_ornull *txn, SV *key, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef) |
… | |
… | |
388 | DESTROY (DBC_ornull *dbc) |
401 | DESTROY (DBC_ornull *dbc) |
389 | CODE: |
402 | CODE: |
390 | if (dbc) |
403 | if (dbc) |
391 | dbc->c_close (dbc); |
404 | dbc->c_close (dbc); |
392 | |
405 | |
|
|
406 | $int = $cursor->set_priority ($priority = PRIORITY_*) |
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407 | |
393 | =head4 Example: |
408 | =head4 Example: |
394 | |
409 | |
395 | my $c = $db->cursor; |
410 | my $c = $db->cursor; |
396 | |
411 | |
397 | for (;;) { |
412 | for (;;) { |
… | |
… | |
435 | =item $msg = BDB::strerror [$errno] |
450 | =item $msg = BDB::strerror [$errno] |
436 | |
451 | |
437 | Returns the string corresponding to the given errno value. If no argument |
452 | Returns the string corresponding to the given errno value. If no argument |
438 | is given, use C<$!>. |
453 | is given, use C<$!>. |
439 | |
454 | |
|
|
455 | Note that the BDB module also patches the C<$!> variable directly, so you |
|
|
456 | should be able to get a bdb error string by simply stringifying C<$!>. |
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|
457 | |
440 | =item $fileno = BDB::poll_fileno |
458 | =item $fileno = BDB::poll_fileno |
441 | |
459 | |
442 | Return the I<request result pipe file descriptor>. This filehandle must be |
460 | Return the I<request result pipe file descriptor>. This filehandle must be |
443 | polled for reading by some mechanism outside this module (e.g. Event or |
461 | polled for reading by some mechanism outside this module (e.g. Event or |
444 | select, see below or the SYNOPSIS). If the pipe becomes readable you have |
462 | select, see below or the SYNOPSIS). If the pipe becomes readable you have |
… | |
… | |
595 | |
613 | |
596 | =item BDB::set_sync_prepare $cb |
614 | =item BDB::set_sync_prepare $cb |
597 | |
615 | |
598 | Sets a callback that is called whenever a request is created without an |
616 | Sets a callback that is called whenever a request is created without an |
599 | explicit callback. It has to return two code references. The first is used |
617 | explicit callback. It has to return two code references. The first is used |
600 | as the request callback, and the second is called to wait until the first |
618 | as the request callback (it should save the return status), and the second |
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|
619 | is called to wait until the first callback has been called (it must set |
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620 | C<$!> to the return status). |
|
|
621 | |
|
|
622 | This mechanism can be used to include BDB into other event mechanisms, |
|
|
623 | such as L<AnyEvent::BDB> or L<Coro::BDB>. |
|
|
624 | |
601 | callback has been called. The default implementation works like this: |
625 | The default implementation works like this: |
602 | |
626 | |
603 | sub { |
627 | sub { |
604 | my $status; |
628 | my $status; |
605 | ( |
629 | ( |
606 | sub { $status = $! }, |
630 | sub { $status = $! }, |
607 | sub { BDB::poll while !defined $status; $! = $status }, |
631 | sub { BDB::poll while !defined $status; $! = $status }, |
608 | ) |
632 | ) |
609 | } |
633 | } |
|
|
634 | |
|
|
635 | It simply blocks the process till the request has finished and then sets |
|
|
636 | C<$!> to the return value. This means that if you don't use a callback, |
|
|
637 | BDB will simply fall back to synchronous operations. |
610 | |
638 | |
611 | =back |
639 | =back |
612 | |
640 | |
613 | =head3 STATISTICAL INFORMATION |
641 | =head3 STATISTICAL INFORMATION |
614 | |
642 | |
… | |
… | |
705 | TXN_DEADLOCK flag will be set on the transaction. See C<db_txn_finish>, |
733 | TXN_DEADLOCK flag will be set on the transaction. See C<db_txn_finish>, |
706 | above. |
734 | above. |
707 | |
735 | |
708 | =head1 SEE ALSO |
736 | =head1 SEE ALSO |
709 | |
737 | |
710 | L<Coro::BDB>, L<IO::AIO>. |
738 | L<AnyEvent::BDB> (event loop integration), L<Coro::BDB> (more natural |
|
|
739 | syntax), L<IO::AIO> (nice to have). |
711 | |
740 | |
712 | =head1 AUTHOR |
741 | =head1 AUTHOR |
713 | |
742 | |
714 | Marc Lehmann <schmorp@schmorp.de> |
743 | Marc Lehmann <schmorp@schmorp.de> |
715 | http://home.schmorp.de/ |
744 | http://home.schmorp.de/ |