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a0d0e21e |
1 | # DB_File.pm -- Perl 5 interface to Berkeley DB |
2 | # |
3 | # written by Paul Marquess (pmarquess@bfsec.bt.co.uk) |
4633a7c4 |
4 | # last modified 14th November 1995 |
5 | # version 1.01 |
8e07c86e |
6 | |
7 | package DB_File::HASHINFO ; |
8 | use Carp; |
9 | |
10 | sub TIEHASH |
11 | { |
12 | bless {} ; |
13 | } |
14 | |
15 | %elements = ( 'bsize' => 0, |
16 | 'ffactor' => 0, |
17 | 'nelem' => 0, |
18 | 'cachesize' => 0, |
19 | 'hash' => 0, |
20 | 'lorder' => 0 |
21 | ) ; |
22 | |
23 | sub FETCH |
24 | { |
25 | return $_[0]{$_[1]} if defined $elements{$_[1]} ; |
26 | |
27 | croak "DB_File::HASHINFO::FETCH - Unknown element '$_[1]'" ; |
28 | } |
29 | |
30 | |
31 | sub STORE |
32 | { |
33 | if ( defined $elements{$_[1]} ) |
34 | { |
35 | $_[0]{$_[1]} = $_[2] ; |
36 | return ; |
37 | } |
38 | |
39 | croak "DB_File::HASHINFO::STORE - Unknown element '$_[1]'" ; |
40 | } |
41 | |
42 | sub DELETE |
43 | { |
44 | if ( defined $elements{$_[1]} ) |
45 | { |
46 | delete ${$_[0]}{$_[1]} ; |
47 | return ; |
48 | } |
49 | |
50 | croak "DB_File::HASHINFO::DELETE - Unknown element '$_[1]'" ; |
51 | } |
52 | |
53 | |
54 | sub DESTROY {undef %{$_[0]} } |
55 | sub FIRSTKEY { croak "DB_File::HASHINFO::FIRSTKEY is not implemented" } |
56 | sub NEXTKEY { croak "DB_File::HASHINFO::NEXTKEY is not implemented" } |
57 | sub EXISTS { croak "DB_File::HASHINFO::EXISTS is not implemented" } |
58 | sub CLEAR { croak "DB_File::HASHINFO::CLEAR is not implemented" } |
59 | |
60 | package DB_File::BTREEINFO ; |
61 | use Carp; |
62 | |
63 | sub TIEHASH |
64 | { |
65 | bless {} ; |
66 | } |
67 | |
68 | %elements = ( 'flags' => 0, |
69 | 'cachesize' => 0, |
70 | 'maxkeypage' => 0, |
71 | 'minkeypage' => 0, |
72 | 'psize' => 0, |
73 | 'compare' => 0, |
74 | 'prefix' => 0, |
75 | 'lorder' => 0 |
76 | ) ; |
77 | |
78 | sub FETCH |
79 | { |
80 | return $_[0]{$_[1]} if defined $elements{$_[1]} ; |
81 | |
82 | croak "DB_File::BTREEINFO::FETCH - Unknown element '$_[1]'" ; |
83 | } |
84 | |
85 | |
86 | sub STORE |
87 | { |
88 | if ( defined $elements{$_[1]} ) |
89 | { |
90 | $_[0]{$_[1]} = $_[2] ; |
91 | return ; |
92 | } |
93 | |
94 | croak "DB_File::BTREEINFO::STORE - Unknown element '$_[1]'" ; |
95 | } |
96 | |
97 | sub DELETE |
98 | { |
99 | if ( defined $elements{$_[1]} ) |
100 | { |
101 | delete ${$_[0]}{$_[1]} ; |
102 | return ; |
103 | } |
104 | |
105 | croak "DB_File::BTREEINFO::DELETE - Unknown element '$_[1]'" ; |
106 | } |
107 | |
108 | |
109 | sub DESTROY {undef %{$_[0]} } |
110 | sub FIRSTKEY { croak "DB_File::BTREEINFO::FIRSTKEY is not implemented" } |
111 | sub NEXTKEY { croak "DB_File::BTREEINFO::NEXTKEY is not implemented" } |
112 | sub EXISTS { croak "DB_File::BTREEINFO::EXISTS is not implemented" } |
113 | sub CLEAR { croak "DB_File::BTREEINFO::CLEAR is not implemented" } |
114 | |
115 | package DB_File::RECNOINFO ; |
116 | use Carp; |
117 | |
118 | sub TIEHASH |
119 | { |
120 | bless {} ; |
121 | } |
122 | |
123 | %elements = ( 'bval' => 0, |
124 | 'cachesize' => 0, |
125 | 'psize' => 0, |
126 | 'flags' => 0, |
127 | 'lorder' => 0, |
128 | 'reclen' => 0, |
129 | 'bfname' => 0 |
130 | ) ; |
131 | sub FETCH |
132 | { |
133 | return $_[0]{$_[1]} if defined $elements{$_[1]} ; |
134 | |
135 | croak "DB_File::RECNOINFO::FETCH - Unknown element '$_[1]'" ; |
136 | } |
137 | |
138 | |
139 | sub STORE |
140 | { |
141 | if ( defined $elements{$_[1]} ) |
142 | { |
143 | $_[0]{$_[1]} = $_[2] ; |
144 | return ; |
145 | } |
146 | |
147 | croak "DB_File::RECNOINFO::STORE - Unknown element '$_[1]'" ; |
148 | } |
149 | |
150 | sub DELETE |
151 | { |
152 | if ( defined $elements{$_[1]} ) |
153 | { |
154 | delete ${$_[0]}{$_[1]} ; |
155 | return ; |
156 | } |
157 | |
158 | croak "DB_File::RECNOINFO::DELETE - Unknown element '$_[1]'" ; |
159 | } |
160 | |
161 | |
162 | sub DESTROY {undef %{$_[0]} } |
163 | sub FIRSTKEY { croak "DB_File::RECNOINFO::FIRSTKEY is not implemented" } |
164 | sub NEXTKEY { croak "DB_File::RECNOINFO::NEXTKEY is not implemented" } |
165 | sub EXISTS { croak "DB_File::BTREEINFO::EXISTS is not implemented" } |
166 | sub CLEAR { croak "DB_File::BTREEINFO::CLEAR is not implemented" } |
167 | |
168 | |
169 | |
170 | package DB_File ; |
171 | use Carp; |
172 | |
c07a80fd |
173 | $VERSION = $VERSION = 1.01 ; |
8e07c86e |
174 | |
175 | #typedef enum { DB_BTREE, DB_HASH, DB_RECNO } DBTYPE; |
c07a80fd |
176 | $DB_BTREE = $DB_BTREE = TIEHASH DB_File::BTREEINFO ; |
177 | $DB_HASH = $DB_HASH = TIEHASH DB_File::HASHINFO ; |
178 | $DB_RECNO = $DB_RECNO = TIEHASH DB_File::RECNOINFO ; |
8e07c86e |
179 | |
180 | require TieHash; |
181 | require Exporter; |
182 | use AutoLoader; |
183 | require DynaLoader; |
184 | @ISA = qw(TieHash Exporter DynaLoader); |
185 | @EXPORT = qw( |
186 | $DB_BTREE $DB_HASH $DB_RECNO |
187 | BTREEMAGIC |
188 | BTREEVERSION |
189 | DB_LOCK |
190 | DB_SHMEM |
191 | DB_TXN |
192 | HASHMAGIC |
193 | HASHVERSION |
194 | MAX_PAGE_NUMBER |
195 | MAX_PAGE_OFFSET |
196 | MAX_REC_NUMBER |
197 | RET_ERROR |
198 | RET_SPECIAL |
199 | RET_SUCCESS |
200 | R_CURSOR |
201 | R_DUP |
202 | R_FIRST |
203 | R_FIXEDLEN |
204 | R_IAFTER |
205 | R_IBEFORE |
206 | R_LAST |
207 | R_NEXT |
208 | R_NOKEY |
209 | R_NOOVERWRITE |
210 | R_PREV |
211 | R_RECNOSYNC |
212 | R_SETCURSOR |
213 | R_SNAPSHOT |
214 | __R_UNUSED |
215 | ); |
216 | |
217 | sub AUTOLOAD { |
218 | local($constname); |
219 | ($constname = $AUTOLOAD) =~ s/.*:://; |
220 | $val = constant($constname, @_ ? $_[0] : 0); |
221 | if ($! != 0) { |
222 | if ($! =~ /Invalid/) { |
223 | $AutoLoader::AUTOLOAD = $AUTOLOAD; |
224 | goto &AutoLoader::AUTOLOAD; |
225 | } |
226 | else { |
227 | ($pack,$file,$line) = caller; |
228 | croak "Your vendor has not defined DB macro $constname, used at $file line $line. |
229 | "; |
230 | } |
231 | } |
232 | eval "sub $AUTOLOAD { $val }"; |
233 | goto &$AUTOLOAD; |
234 | } |
235 | |
c07a80fd |
236 | bootstrap DB_File ; |
8e07c86e |
237 | |
238 | # Preloaded methods go here. Autoload methods go after __END__, and are |
239 | # processed by the autosplit program. |
240 | |
241 | 1; |
242 | __END__ |
243 | |
244 | =cut |
3b35bae3 |
245 | |
246 | =head1 NAME |
247 | |
248 | DB_File - Perl5 access to Berkeley DB |
249 | |
250 | =head1 SYNOPSIS |
251 | |
252 | use DB_File ; |
253 | |
254 | [$X =] tie %hash, DB_File, $filename [, $flags, $mode, $DB_HASH] ; |
255 | [$X =] tie %hash, DB_File, $filename, $flags, $mode, $DB_BTREE ; |
256 | [$X =] tie @array, DB_File, $filename, $flags, $mode, $DB_RECNO ; |
257 | |
258 | $status = $X->del($key [, $flags]) ; |
259 | $status = $X->put($key, $value [, $flags]) ; |
260 | $status = $X->get($key, $value [, $flags]) ; |
261 | $status = $X->seq($key, $value [, $flags]) ; |
262 | $status = $X->sync([$flags]) ; |
263 | $status = $X->fd ; |
264 | |
265 | untie %hash ; |
266 | untie @array ; |
267 | |
268 | =head1 DESCRIPTION |
269 | |
8e07c86e |
270 | B<DB_File> is a module which allows Perl programs to make use of the |
271 | facilities provided by Berkeley DB. If you intend to use this |
272 | module you should really have a copy of the Berkeley DB manualpage at |
273 | hand. The interface defined here mirrors the Berkeley DB interface |
274 | closely. |
3b35bae3 |
275 | |
8e07c86e |
276 | Berkeley DB is a C library which provides a consistent interface to a |
277 | number of database formats. B<DB_File> provides an interface to all |
278 | three of the database types currently supported by Berkeley DB. |
3b35bae3 |
279 | |
280 | The file types are: |
281 | |
282 | =over 5 |
283 | |
284 | =item DB_HASH |
285 | |
8e07c86e |
286 | This database type allows arbitrary key/data pairs to be stored in data |
287 | files. This is equivalent to the functionality provided by other |
288 | hashing packages like DBM, NDBM, ODBM, GDBM, and SDBM. Remember though, |
289 | the files created using DB_HASH are not compatible with any of the |
290 | other packages mentioned. |
3b35bae3 |
291 | |
8e07c86e |
292 | A default hashing algorithm, which will be adequate for most |
293 | applications, is built into Berkeley DB. If you do need to use your own |
294 | hashing algorithm it is possible to write your own in Perl and have |
295 | B<DB_File> use it instead. |
3b35bae3 |
296 | |
297 | =item DB_BTREE |
298 | |
8e07c86e |
299 | The btree format allows arbitrary key/data pairs to be stored in a |
300 | sorted, balanced binary tree. |
3b35bae3 |
301 | |
8e07c86e |
302 | As with the DB_HASH format, it is possible to provide a user defined |
303 | Perl routine to perform the comparison of keys. By default, though, the |
304 | keys are stored in lexical order. |
3b35bae3 |
305 | |
306 | =item DB_RECNO |
307 | |
8e07c86e |
308 | DB_RECNO allows both fixed-length and variable-length flat text files |
309 | to be manipulated using the same key/value pair interface as in DB_HASH |
310 | and DB_BTREE. In this case the key will consist of a record (line) |
311 | number. |
3b35bae3 |
312 | |
313 | =back |
314 | |
315 | =head2 How does DB_File interface to Berkeley DB? |
316 | |
317 | B<DB_File> allows access to Berkeley DB files using the tie() mechanism |
8e07c86e |
318 | in Perl 5 (for full details, see L<perlfunc/tie()>). This facility |
319 | allows B<DB_File> to access Berkeley DB files using either an |
320 | associative array (for DB_HASH & DB_BTREE file types) or an ordinary |
321 | array (for the DB_RECNO file type). |
3b35bae3 |
322 | |
8e07c86e |
323 | In addition to the tie() interface, it is also possible to use most of |
324 | the functions provided in the Berkeley DB API. |
3b35bae3 |
325 | |
326 | =head2 Differences with Berkeley DB |
327 | |
8e07c86e |
328 | Berkeley DB uses the function dbopen() to open or create a database. |
329 | Below is the C prototype for dbopen(). |
3b35bae3 |
330 | |
331 | DB* |
332 | dbopen (const char * file, int flags, int mode, |
333 | DBTYPE type, const void * openinfo) |
334 | |
335 | The parameter C<type> is an enumeration which specifies which of the 3 |
336 | interface methods (DB_HASH, DB_BTREE or DB_RECNO) is to be used. |
337 | Depending on which of these is actually chosen, the final parameter, |
338 | I<openinfo> points to a data structure which allows tailoring of the |
339 | specific interface method. |
340 | |
8e07c86e |
341 | This interface is handled slightly differently in B<DB_File>. Here is |
342 | an equivalent call using B<DB_File>. |
3b35bae3 |
343 | |
344 | tie %array, DB_File, $filename, $flags, $mode, $DB_HASH ; |
345 | |
8e07c86e |
346 | The C<filename>, C<flags> and C<mode> parameters are the direct |
347 | equivalent of their dbopen() counterparts. The final parameter $DB_HASH |
348 | performs the function of both the C<type> and C<openinfo> parameters in |
349 | dbopen(). |
3b35bae3 |
350 | |
8e07c86e |
351 | In the example above $DB_HASH is actually a reference to a hash |
352 | object. B<DB_File> has three of these pre-defined references. Apart |
353 | from $DB_HASH, there is also $DB_BTREE and $DB_RECNO. |
3b35bae3 |
354 | |
8e07c86e |
355 | The keys allowed in each of these pre-defined references is limited to |
356 | the names used in the equivalent C structure. So, for example, the |
357 | $DB_HASH reference will only allow keys called C<bsize>, C<cachesize>, |
358 | C<ffactor>, C<hash>, C<lorder> and C<nelem>. |
3b35bae3 |
359 | |
360 | To change one of these elements, just assign to it like this |
361 | |
362 | $DB_HASH{cachesize} = 10000 ; |
363 | |
364 | |
365 | =head2 RECNO |
366 | |
367 | |
368 | In order to make RECNO more compatible with Perl the array offset for all |
369 | RECNO arrays begins at 0 rather than 1 as in Berkeley DB. |
370 | |
371 | |
372 | =head2 In Memory Databases |
373 | |
8e07c86e |
374 | Berkeley DB allows the creation of in-memory databases by using NULL |
375 | (that is, a C<(char *)0 in C) in place of the filename. B<DB_File> |
376 | uses C<undef> instead of NULL to provide this functionality. |
3b35bae3 |
377 | |
378 | |
379 | =head2 Using the Berkeley DB Interface Directly |
380 | |
381 | As well as accessing Berkeley DB using a tied hash or array, it is also |
8e07c86e |
382 | possible to make direct use of most of the functions defined in the |
383 | Berkeley DB documentation. |
3b35bae3 |
384 | |
385 | |
386 | To do this you need to remember the return value from the tie. |
387 | |
388 | $db = tie %hash, DB_File, "filename" |
389 | |
8e07c86e |
390 | Once you have done that, you can access the Berkeley DB API functions |
391 | directly. |
3b35bae3 |
392 | |
393 | $db->put($key, $value, R_NOOVERWRITE) ; |
394 | |
8e07c86e |
395 | All the functions defined in L<dbx(3X)> are available except for |
396 | close() and dbopen() itself. The B<DB_File> interface to these |
397 | functions have been implemented to mirror the the way Berkeley DB |
398 | works. In particular note that all the functions return only a status |
399 | value. Whenever a Berkeley DB function returns data via one of its |
400 | parameters, the B<DB_File> equivalent does exactly the same. |
3b35bae3 |
401 | |
402 | All the constants defined in L<dbopen> are also available. |
403 | |
404 | Below is a list of the functions available. |
405 | |
406 | =over 5 |
407 | |
408 | =item get |
409 | |
8e07c86e |
410 | Same as in C<recno> except that the flags parameter is optional. |
411 | Remember the value associated with the key you request is returned in |
412 | the $value parameter. |
3b35bae3 |
413 | |
414 | =item put |
415 | |
416 | As usual the flags parameter is optional. |
417 | |
8e07c86e |
418 | If you use either the R_IAFTER or R_IBEFORE flags, the key parameter |
419 | will have the record number of the inserted key/value pair set. |
3b35bae3 |
420 | |
421 | =item del |
422 | |
423 | The flags parameter is optional. |
424 | |
425 | =item fd |
426 | |
427 | As in I<recno>. |
428 | |
429 | =item seq |
430 | |
431 | The flags parameter is optional. |
432 | |
433 | Both the key and value parameters will be set. |
434 | |
435 | =item sync |
436 | |
437 | The flags parameter is optional. |
438 | |
439 | =back |
440 | |
441 | =head1 EXAMPLES |
442 | |
8e07c86e |
443 | It is always a lot easier to understand something when you see a real |
444 | example. So here are a few. |
3b35bae3 |
445 | |
446 | =head2 Using HASH |
447 | |
448 | use DB_File ; |
449 | use Fcntl ; |
450 | |
8e07c86e |
451 | tie %h, "DB_File", "hashed", O_RDWR|O_CREAT, 0640, $DB_HASH ; |
3b35bae3 |
452 | |
453 | # Add a key/value pair to the file |
454 | $h{"apple"} = "orange" ; |
455 | |
456 | # Check for existence of a key |
457 | print "Exists\n" if $h{"banana"} ; |
458 | |
459 | # Delete |
460 | delete $h{"apple"} ; |
461 | |
462 | untie %h ; |
463 | |
464 | =head2 Using BTREE |
465 | |
8e07c86e |
466 | Here is sample of code which used BTREE. Just to make life more |
467 | interesting the default comparision function will not be used. Instead |
468 | a Perl sub, C<Compare()>, will be used to do a case insensitive |
469 | comparison. |
3b35bae3 |
470 | |
471 | use DB_File ; |
472 | use Fcntl ; |
473 | |
474 | sub Compare |
475 | { |
476 | my ($key1, $key2) = @_ ; |
477 | |
478 | "\L$key1" cmp "\L$key2" ; |
479 | } |
480 | |
481 | $DB_BTREE->{compare} = 'Compare' ; |
482 | |
8e07c86e |
483 | tie %h, 'DB_File', "tree", O_RDWR|O_CREAT, 0640, $DB_BTREE ; |
3b35bae3 |
484 | |
485 | # Add a key/value pair to the file |
486 | $h{'Wall'} = 'Larry' ; |
487 | $h{'Smith'} = 'John' ; |
488 | $h{'mouse'} = 'mickey' ; |
489 | $h{'duck'} = 'donald' ; |
490 | |
491 | # Delete |
492 | delete $h{"duck"} ; |
493 | |
494 | # Cycle through the keys printing them in order. |
495 | # Note it is not necessary to sort the keys as |
496 | # the btree will have kept them in order automatically. |
497 | foreach (keys %h) |
498 | { print "$_\n" } |
499 | |
500 | untie %h ; |
501 | |
502 | Here is the output from the code above. |
503 | |
504 | mouse |
505 | Smith |
506 | Wall |
507 | |
508 | |
509 | =head2 Using RECNO |
510 | |
511 | use DB_File ; |
512 | use Fcntl ; |
513 | |
514 | $DB_RECNO->{psize} = 3000 ; |
515 | |
516 | tie @h, DB_File, "text", O_RDWR|O_CREAT, 0640, $DB_RECNO ; |
517 | |
518 | # Add a key/value pair to the file |
519 | $h[0] = "orange" ; |
520 | |
521 | # Check for existence of a key |
522 | print "Exists\n" if $h[1] ; |
523 | |
524 | untie @h ; |
525 | |
526 | |
cb1a09d0 |
527 | =head2 Locking Databases |
3b35bae3 |
528 | |
cb1a09d0 |
529 | Concurrent access of a read-write database by several parties requires |
530 | them all to use some kind of locking. Here's an example of Tom's that |
531 | uses the I<fd> method to get the file descriptor, and then a careful |
532 | open() to give something Perl will flock() for you. Run this repeatedly |
533 | in the background to watch the locks granted in proper order. |
3b35bae3 |
534 | |
cb1a09d0 |
535 | use Fcntl; |
536 | use DB_File; |
537 | |
538 | use strict; |
539 | |
540 | sub LOCK_SH { 1 } |
541 | sub LOCK_EX { 2 } |
542 | sub LOCK_NB { 4 } |
543 | sub LOCK_UN { 8 } |
544 | |
545 | my($oldval, $fd, $db, %db, $value, $key); |
546 | |
547 | $key = shift || 'default'; |
548 | $value = shift || 'magic'; |
549 | |
550 | $value .= " $$"; |
551 | |
552 | $db = tie(%db, 'DB_File', '/tmp/foo.db', O_CREAT|O_RDWR, 0644) |
553 | || die "dbcreat /tmp/foo.db $!"; |
554 | $fd = $db->fd; |
555 | print "$$: db fd is $fd\n"; |
556 | open(DB_FH, "+<&=$fd") || die "dup $!"; |
557 | |
558 | |
559 | unless (flock (DB_FH, LOCK_SH | LOCK_NB)) { |
560 | print "$$: CONTENTION; can't read during write update! |
561 | Waiting for read lock ($!) ...."; |
562 | unless (flock (DB_FH, LOCK_SH)) { die "flock: $!" } |
563 | } |
564 | print "$$: Read lock granted\n"; |
565 | |
566 | $oldval = $db{$key}; |
567 | print "$$: Old value was $oldval\n"; |
568 | flock(DB_FH, LOCK_UN); |
569 | |
570 | unless (flock (DB_FH, LOCK_EX | LOCK_NB)) { |
571 | print "$$: CONTENTION; must have exclusive lock! |
572 | Waiting for write lock ($!) ...."; |
573 | unless (flock (DB_FH, LOCK_EX)) { die "flock: $!" } |
574 | } |
575 | |
576 | print "$$: Write lock granted\n"; |
577 | $db{$key} = $value; |
578 | sleep 10; |
579 | |
580 | flock(DB_FH, LOCK_UN); |
581 | untie %db; |
582 | close(DB_FH); |
583 | print "$$: Updated db to $key=$value\n"; |
584 | |
585 | =head1 HISTORY |
586 | |
587 | =over |
588 | |
589 | =item 0.1 |
3b35bae3 |
590 | |
591 | First Release. |
592 | |
cb1a09d0 |
593 | =item 0.2 |
3b35bae3 |
594 | |
595 | When B<DB_File> is opening a database file it no longer terminates the |
596 | process if I<dbopen> returned an error. This allows file protection |
597 | errors to be caught at run time. Thanks to Judith Grass |
cb1a09d0 |
598 | E<lt>grass@cybercash.comE<gt> for spotting the bug. |
3b35bae3 |
599 | |
cb1a09d0 |
600 | =item 0.3 |
8e07c86e |
601 | |
602 | Added prototype support for multiple btree compare callbacks. |
603 | |
cb1a09d0 |
604 | =item 1.0 |
8e07c86e |
605 | |
606 | B<DB_File> has been in use for over a year. To reflect that, the |
607 | version number has been incremented to 1.0. |
608 | |
609 | Added complete support for multiple concurrent callbacks. |
610 | |
611 | Using the I<push> method on an empty list didn't work properly. This |
612 | has been fixed. |
613 | |
cb1a09d0 |
614 | =item 1.01 |
4633a7c4 |
615 | |
616 | Fixed a core dump problem with SunOS. |
617 | |
618 | The return value from TIEHASH wasn't set to NULL when dbopen returned |
619 | an error. |
620 | |
3b35bae3 |
621 | =head1 WARNINGS |
622 | |
8e07c86e |
623 | If you happen find any other functions defined in the source for this |
624 | module that have not been mentioned in this document -- beware. I may |
625 | drop them at a moments notice. |
3b35bae3 |
626 | |
8e07c86e |
627 | If you cannot find any, then either you didn't look very hard or the |
628 | moment has passed and I have dropped them. |
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629 | |
630 | =head1 BUGS |
631 | |
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632 | Some older versions of Berkeley DB had problems with fixed length |
633 | records using the RECNO file format. The newest version at the time of |
634 | writing was 1.85 - this seems to have fixed the problems with RECNO. |
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635 | |
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636 | I am sure there are bugs in the code. If you do find any, or can |
637 | suggest any enhancements, I would welcome your comments. |
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638 | |
639 | =head1 AVAILABILITY |
640 | |
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641 | Berkeley DB is available at your nearest CPAN archive (see |
642 | L<perlmod/"CPAN"> for a list) in F<src/misc/db.1.85.tar.gz>, or via the |
643 | host F<ftp.cs.berkeley.edu> in F</ucb/4bsd/db.tar.gz>. It is I<not> under |
644 | the GPL. |
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645 | |
646 | =head1 SEE ALSO |
647 | |
648 | L<perl(1)>, L<dbopen(3)>, L<hash(3)>, L<recno(3)>, L<btree(3)> |
649 | |
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650 | Berkeley DB is available from F<ftp.cs.berkeley.edu> in the directory |
651 | F</ucb/4bsd>. |
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652 | |
653 | =head1 AUTHOR |
654 | |
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655 | The DB_File interface was written by Paul Marquess |
656 | <pmarquess@bfsec.bt.co.uk>. |
657 | Questions about the DB system itself may be addressed to Keith Bostic |
658 | <bostic@cs.berkeley.edu>. |
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659 | |
660 | =cut |