/usr/share/perl5/DBIx/SearchBuilder/Record.pm is in libdbix-searchbuilder-perl 1.66-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 | package DBIx::SearchBuilder::Record;
use strict;
use warnings;
use vars qw($AUTOLOAD);
use Class::ReturnValue;
use Encode qw();
use DBIx::SearchBuilder::Util qw/ sorted_values /;
=head1 NAME
DBIx::SearchBuilder::Record - Superclass for records loaded by SearchBuilder
=head1 SYNOPSIS
package MyRecord;
use base qw/DBIx::SearchBuilder::Record/;
sub _Init {
my $self = shift;
my $DBIxHandle =
shift; # A DBIx::SearchBuilder::Handle::foo object for your database
$self->_Handle($DBIxHandle);
$self->Table("Users");
}
# Tell Record what the primary keys are
sub _PrimaryKeys {
return ['id'];
}
# Preferred and most efficient way to specify fields attributes in a derived
# class, used by the autoloader to construct Attrib and SetAttrib methods.
# read: calling $Object->Foo will return the value of this record's Foo column
# write: calling $Object->SetFoo with a single value will set Foo's value in
# both the loaded object and the database
sub _ClassAccessible {
{
Tofu => { 'read' => 1, 'write' => 1 },
Maz => { 'auto' => 1, },
Roo => { 'read' => 1, 'auto' => 1, 'public' => 1, },
};
}
# A subroutine to check a user's password without returning the current value
# For security purposes, we didn't expose the Password method above
sub IsPassword {
my $self = shift;
my $try = shift;
# note two __s in __Value. Subclasses may muck with _Value, but
# they should never touch __Value
if ( $try eq $self->__Value('Password') ) {
return (1);
}
else {
return (undef);
}
}
# Override DBIx::SearchBuilder::Create to do some checking on create
sub Create {
my $self = shift;
my %fields = (
UserId => undef,
Password => 'default', #Set a default password
@_
);
# Make sure a userid is specified
unless ( $fields{'UserId'} ) {
die "No userid specified.";
}
# Get DBIx::SearchBuilder::Record->Create to do the real work
return (
$self->SUPER::Create(
UserId => $fields{'UserId'},
Password => $fields{'Password'},
Created => time
)
);
}
=head1 DESCRIPTION
DBIx::SearchBuilder::Record is designed to work with DBIx::SearchBuilder.
=head2 What is it trying to do.
DBIx::SearchBuilder::Record abstracts the agony of writing the common and generally
simple SQL statements needed to serialize and De-serialize an object to the
database. In a traditional system, you would define various methods on
your object 'create', 'find', 'modify', and 'delete' being the most common.
In each method you would have a SQL statement like:
select * from table where value='blah';
If you wanted to control what data a user could modify, you would have to
do some special magic to make accessors do the right thing. Etc. The
problem with this approach is that in a majority of the cases, the SQL is
incredibly simple and the code from one method/object to the next was
basically the same.
<trumpets>
Enter, DBIx::SearchBuilder::Record.
With::Record, you can in the simple case, remove all of that code and
replace it by defining two methods and inheriting some code. Its pretty
simple, and incredibly powerful. For more complex cases, you can, gasp,
do more complicated things by overriding certain methods. Lets stick with
the simple case for now.
The two methods in question are '_Init' and '_ClassAccessible', all they
really do are define some values and send you on your way. As you might
have guessed the '_' suggests that these are private methods, they are.
They will get called by your record objects constructor.
=over 4
=item '_Init'
Defines what table we are talking about, and set a variable to store
the database handle.
=item '_ClassAccessible
Defines what operations may be performed on various data selected
from the database. For example you can define fields to be mutable,
or immutable, there are a few other options but I don't understand
what they do at this time.
=back
And really, thats it. So lets have some sample code.
=head2 An Annotated Example
The example code below makes the following assumptions:
=over 4
=item *
The database is 'postgres',
=item *
The host is 'reason',
=item *
The login name is 'mhat',
=item *
The database is called 'example',
=item *
The table is called 'simple',
=item *
The table looks like so:
id integer not NULL, primary_key(id),
foo varchar(10),
bar varchar(10)
=back
First, let's define our record class in a new module named "Simple.pm".
000: package Simple;
001: use DBIx::SearchBuilder::Record;
002: @ISA = (DBIx::SearchBuilder::Record);
This should be pretty obvious, name the package, import ::Record and then
define ourself as a subclass of ::Record.
003:
004: sub _Init {
005: my $this = shift;
006: my $handle = shift;
007:
008: $this->_Handle($handle);
009: $this->Table("Simple");
010:
011: return ($this);
012: }
Here we set our handle and table name, while its not obvious so far, we'll
see later that $handle (line: 006) gets passed via ::Record::new when a
new instance is created. Thats actually an important concept, the DB handle
is not bound to a single object but rather, its shared across objects.
013:
014: sub _ClassAccessible {
015: {
016: Foo => { 'read' => 1 },
017: Bar => { 'read' => 1, 'write' => 1 },
018: Id => { 'read' => 1 }
019: };
020: }
What's happening might be obvious, but just in case this method is going to
return a reference to a hash. That hash is where our columns are defined,
as well as what type of operations are acceptable.
021:
022: 1;
Like all perl modules, this needs to end with a true value.
Now, on to the code that will actually *do* something with this object.
This code would be placed in your Perl script.
000: use DBIx::SearchBuilder::Handle;
001: use Simple;
Use two packages, the first is where I get the DB handle from, the latter
is the object I just created.
002:
003: my $handle = DBIx::SearchBuilder::Handle->new();
004: $handle->Connect( 'Driver' => 'Pg',
005: 'Database' => 'test',
006: 'Host' => 'reason',
007: 'User' => 'mhat',
008: 'Password' => '');
Creates a new DBIx::SearchBuilder::Handle, and then connects to the database using
that handle. Pretty straight forward, the password '' is what I use
when there is no password. I could probably leave it blank, but I find
it to be more clear to define it.
009:
010: my $s = Simple->new($handle);
011:
012: $s->LoadById(1);
LoadById is one of four 'LoadBy' methods, as the name suggests it searches
for an row in the database that has id='0'. ::SearchBuilder has, what I
think is a bug, in that it current requires there to be an id field. More
reasonably it also assumes that the id field is unique. LoadById($id) will
do undefined things if there is >1 row with the same id.
In addition to LoadById, we also have:
=over 4
=item LoadByCol
Takes two arguments, a column name and a value. Again, it will do
undefined things if you use non-unique things.
=item LoadByCols
Takes a hash of columns=>values and returns the *first* to match.
First is probably lossy across databases vendors.
=item LoadFromHash
Populates this record with data from a DBIx::SearchBuilder. I'm
currently assuming that DBIx::SearchBuilder is what we use in
cases where we expect > 1 record. More on this later.
=back
Now that we have a populated object, we should do something with it! ::Record
automagically generates accessos and mutators for us, so all we need to do
is call the methods. Accessors are named <Field>(), and Mutators are named
Set<Field>($). On to the example, just appending this to the code from
the last example.
013:
014: print "ID : ", $s->Id(), "\n";
015: print "Foo : ", $s->Foo(), "\n";
016: print "Bar : ", $s->Bar(), "\n";
Thats all you have to to get the data, now to change the data!
017:
018: $s->SetBar('NewBar');
Pretty simple! Thats really all there is to it. Set<Field>($) returns
a boolean and a string describing the problem. Lets look at an example of
what will happen if we try to set a 'Id' which we previously defined as
read only.
019: my ($res, $str) = $s->SetId('2');
020: if (! $res) {
021: ## Print the error!
022: print "$str\n";
023: }
The output will be:
>> Immutable field
Currently Set<Field> updates the data in the database as soon as you call
it. In the future I hope to extend ::Record to better support transactional
operations, such that updates will only happen when "you" say so.
Finally, adding a removing records from the database. ::Record provides a
Create method which simply takes a hash of key=>value pairs. The keys
exactly map to database fields.
023: ## Get a new record object.
024: $s1 = Simple->new($handle);
025: $s1->Create('Id' => 4,
026: 'Foo' => 'Foooooo',
027: 'Bar' => 'Barrrrr');
Poof! A new row in the database has been created! Now lets delete the
object!
028:
029: $s1 = undef;
030: $s1 = Simple->new($handle);
031: $s1->LoadById(4);
032: $s1->Delete();
And its gone.
For simple use, thats more or less all there is to it. In the future, I hope to exapand
this HowTo to discuss using container classes, overloading, and what
ever else I think of.
=head1 METHOD NAMING
Each method has a lower case alias; '_' is used to separate words.
For example, the method C<_PrimaryKeys> has the alias C<_primary_keys>.
=head1 METHODS
=cut
=head2 new
Instantiate a new record object.
=cut
sub new {
my $proto = shift;
my $class = ref($proto) || $proto;
my $self = {};
bless ($self, $class);
$self->_Init(@_);
return $self;
}
# Not yet documented here. Should almost certainly be overloaded.
sub _Init {
my $self = shift;
my $handle = shift;
$self->_Handle($handle);
}
=head2 id
Returns this row's primary key.
=cut
*id = \&Id;
sub Id {
my $pkey = $_[0]->_PrimaryKey();
return $_[0]->{'values'}->{ $pkey };
}
=head2 primary_keys
=head2 PrimaryKeys
Return a hash of the values of our primary keys for this function.
=cut
sub PrimaryKeys {
my $self = shift;
return map { $_ => $self->{'values'}->{lc $_} } @{$self->_PrimaryKeys};
}
sub DESTROY {
return 1;
}
sub AUTOLOAD {
my $self = $_[0];
no strict 'refs';
my ($Attrib) = ( $AUTOLOAD =~ /::(\w+)$/o );
if ( $self->_Accessible( $Attrib, 'read' ) ) {
*{$AUTOLOAD} = sub { return ( $_[0]->_Value($Attrib) ) };
goto &$AUTOLOAD;
}
elsif ( $self->_Accessible( $Attrib, 'record-read') ) {
*{$AUTOLOAD} = sub { $_[0]->_ToRecord( $Attrib, $_[0]->__Value($Attrib) ) };
goto &$AUTOLOAD;
}
elsif ( $self->_Accessible( $Attrib, 'foreign-collection') ) {
*{$AUTOLOAD} = sub { $_[0]->_CollectionValue( $Attrib ) };
goto &$AUTOLOAD;
}
elsif ( $AUTOLOAD =~ /.*::[sS]et_?(\w+)/o ) {
$Attrib = $1;
if ( $self->_Accessible( $Attrib, 'write' ) ) {
*{$AUTOLOAD} = sub {
return ( $_[0]->_Set( Field => $Attrib, Value => $_[1] ) );
};
goto &$AUTOLOAD;
} elsif ( $self->_Accessible( $Attrib, 'record-write') ) {
*{$AUTOLOAD} = sub {
my $self = shift;
my $val = shift;
$val = $val->id if UNIVERSAL::isa($val, 'DBIx::SearchBuilder::Record');
return ( $self->_Set( Field => $Attrib, Value => $val ) );
};
goto &$AUTOLOAD;
}
elsif ( $self->_Accessible( $Attrib, 'read' ) ) {
*{$AUTOLOAD} = sub { return ( 0, 'Immutable field' ) };
goto &$AUTOLOAD;
}
else {
return ( 0, 'Nonexistant field?' );
}
}
elsif ( $AUTOLOAD =~ /.*::(\w+?)_?[oO]bj$/o ) {
$Attrib = $1;
if ( $self->_Accessible( $Attrib, 'object' ) ) {
*{$AUTOLOAD} = sub {
return (shift)->_Object(
Field => $Attrib,
Args => [@_],
);
};
goto &$AUTOLOAD;
}
else {
return ( 0, 'No object mapping for field' );
}
}
#Previously, I checked for writability here. but I'm not sure that's the
#right idea. it breaks the ability to do ValidateQueue for a ticket
#on creation.
elsif ( $AUTOLOAD =~ /.*::[vV]alidate_?(\w+)/o ) {
$Attrib = $1;
*{$AUTOLOAD} = sub { return ( $_[0]->_Validate( $Attrib, $_[1] ) ) };
goto &$AUTOLOAD;
}
# TODO: if autoload = 0 or 1 _ then a combination of lowercase and _ chars,
# turn them into studlycapped phrases
else {
my ( $package, $filename, $line );
( $package, $filename, $line ) = caller;
die "$AUTOLOAD Unimplemented in $package. ($filename line $line) \n";
}
}
=head2 _Accessible KEY MODE
Private method.
Returns undef unless C<KEY> is accessible in C<MODE> otherwise returns C<MODE> value
=cut
sub _Accessible {
my $self = shift;
my $attr = shift;
my $mode = lc(shift || '');
my $attribute = $self->_ClassAccessible(@_)->{$attr};
return unless defined $attribute;
return $attribute->{$mode};
}
=head2 _PrimaryKeys
Return our primary keys. (Subclasses should override this, but our default is that we have one primary key, named 'id'.)
=cut
sub _PrimaryKeys {
my $self = shift;
return ['id'];
}
sub _PrimaryKey {
my $self = shift;
my $pkeys = $self->_PrimaryKeys();
die "No primary key" unless ( ref($pkeys) eq 'ARRAY' and $pkeys->[0] );
die "Too many primary keys" unless ( scalar(@$pkeys) == 1 );
return $pkeys->[0];
}
=head2 _ClassAccessible
An older way to specify fields attributes in a derived class.
(The current preferred method is by overriding C<Schema>; if you do
this and don't override C<_ClassAccessible>, the module will generate
an appropriate C<_ClassAccessible> based on your C<Schema>.)
Here's an example declaration:
sub _ClassAccessible {
{
Tofu => { 'read'=>1, 'write'=>1 },
Maz => { 'auto'=>1, },
Roo => { 'read'=>1, 'auto'=>1, 'public'=>1, },
};
}
=cut
sub _ClassAccessible {
my $self = shift;
return $self->_ClassAccessibleFromSchema if $self->can('Schema');
# XXX This is stub code to deal with the old way we used to do _Accessible
# It should never be called by modern code
my %accessible;
while ( my $col = shift ) {
$accessible{$col}->{lc($_)} = 1
foreach split(/[\/,]/, shift);
}
return(\%accessible);
}
sub _ClassAccessibleFromSchema {
my $self = shift;
my $accessible = {};
foreach my $key ($self->_PrimaryKeys) {
$accessible->{$key} = { 'read' => 1 };
};
my $schema = $self->Schema;
for my $field (keys %$schema) {
if ($schema->{$field}{'TYPE'}) {
$accessible->{$field} = { 'read' => 1, 'write' => 1 };
} elsif (my $refclass = $schema->{$field}{'REFERENCES'}) {
if (UNIVERSAL::isa($refclass, 'DBIx::SearchBuilder::Record')) {
if ($field =~ /(.*)_id$/) {
$accessible->{$field} = { 'read' => 1, 'write' => 1 };
$accessible->{$1} = { 'record-read' => 1, 'column' => $field };
} else {
$accessible->{$field} = { 'record-read' => 1, 'record-write' => 1 };
}
} elsif (UNIVERSAL::isa($refclass, 'DBIx::SearchBuilder')) {
$accessible->{$field} = { 'foreign-collection' => 1 };
} else {
warn "Error: $refclass neither Record nor Collection";
}
}
}
return $accessible;
}
sub _ToRecord {
my $self = shift;
my $field = shift;
my $value = shift;
return unless defined $value;
my $schema = $self->Schema;
my $description = $schema->{$field} || $schema->{$field . "_id"};
die "Can't get schema for $field on $self" unless $description;
return unless $description;
return $value unless $description->{'REFERENCES'};
my $classname = $description->{'REFERENCES'};
return unless UNIVERSAL::isa($classname, 'DBIx::SearchBuilder::Record');
# XXX TODO FIXME perhaps this is not what should be passed to new, but it needs it
my $object = $classname->new( $self->_Handle );
$object->LoadById( $value );
return $object;
}
sub _CollectionValue {
my $self = shift;
my $method_name = shift;
return unless defined $method_name;
my $schema = $self->Schema;
my $description = $schema->{$method_name};
return unless $description;
my $classname = $description->{'REFERENCES'};
return unless UNIVERSAL::isa($classname, 'DBIx::SearchBuilder');
my $coll = $classname->new( Handle => $self->_Handle );
$coll->Limit( FIELD => $description->{'KEY'}, VALUE => $self->id);
return $coll;
}
# sub {{{ ReadableAttributes
=head2 ReadableAttributes
Returns an array of the attributes of this class defined as "read" => 1 in this class' _ClassAccessible datastructure
=cut
sub ReadableAttributes {
my $self = shift;
my $ca = $self->_ClassAccessible();
my @readable = grep { $ca->{$_}->{'read'} or $ca->{$_}->{'record-read'} } sort keys %{$ca};
return (@readable);
}
=head2 WritableAttributes
Returns an array of the attributes of this class defined as "write" => 1 in this class' _ClassAccessible datastructure
=cut
sub WritableAttributes {
my $self = shift;
my $ca = $self->_ClassAccessible();
my @writable = grep { $ca->{$_}->{'write'} || $ca->{$_}->{'record-write'} } sort keys %{$ca};
return @writable;
}
=head2 __Value
Takes a field name and returns that field's value. Subclasses should never
override __Value.
=cut
sub __Value {
my $self = shift;
my $field = lc shift;
$field = $self->_Accessible($field, "column") || $field;
return $self->{'values'}{$field} if $self->{'fetched'}{$field};
$self->{'fetched'}{$field} = 1;
my %pk = $self->PrimaryKeys;
return undef if grep !defined, values %pk;
my $query = "SELECT $field FROM ". $self->Table
." WHERE ". join " AND ", map "$_ = ?", sort keys %pk;
my $sth = $self->_Handle->SimpleQuery( $query, sorted_values(%pk) ) or return undef;
return $self->{'values'}{$field} = ($sth->fetchrow_array)[0];
}
=head2 _Value
_Value takes a single column name and returns that column's value for this row.
Subclasses can override _Value to insert custom access control.
=cut
sub _Value {
my $self = shift;
return ($self->__Value(@_));
}
=head2 _Set
_Set takes a single column name and a single unquoted value.
It updates both the in-memory value of this column and the in-database copy.
Subclasses can override _Set to insert custom access control.
=cut
sub _Set {
my $self = shift;
return ($self->__Set(@_));
}
sub __Set {
my $self = shift;
my %args = (
'Field' => undef,
'Value' => undef,
'IsSQL' => undef,
@_
);
$args{'Column'} = delete $args{'Field'};
$args{'IsSQLFunction'} = delete $args{'IsSQL'};
my $ret = Class::ReturnValue->new();
unless ( $args{'Column'} ) {
$ret->as_array( 0, 'No column specified' );
$ret->as_error(
errno => 5,
do_backtrace => 0,
message => "No column specified"
);
return ( $ret->return_value );
}
my $column = lc $args{'Column'};
# XXX: OLD behaviour, no_undefs_in_set will go away
if ( !defined $args{'Value'} && $self->{'no_undefs_in_set' } ) {
$ret->as_array( 0, "No value passed to _Set" );
$ret->as_error(
errno => 2,
do_backtrace => 0,
message => "No value passed to _Set"
);
return ( $ret->return_value );
}
if ( defined $args{'Value'} ) {
if ( $args{'Value'} eq '' &&
( $self->_Accessible( $args{'Column'}, 'is_numeric' )
|| ($self->_Accessible( $args{'Column'}, 'type' ) || '') =~ /INT/i ) )
{
$args{'Value'} = 0;
}
}
else {
if ( $self->_Accessible( $args{Column}, 'no_nulls' ) ) {
my $default = $self->_Accessible( $args{Column}, 'default' );
if ( defined $default ) {
$args{'Value'} = $default;
}
else {
$ret->as_array( 0, 'Illegal value for non-nullable field ' . $args{'Column'} . ": undef/null value provided and no default specified by class" );
$ret->as_error(
errno => 3,
do_backtrace => 0,
message => "Illegal value for non-nullable field " . $args{'Column'} . ": undef/null value provided and no default specified by class"
);
return ( $ret->return_value );
}
}
}
my $current_value = $self->__Value($column);
if (
( !defined $args{'Value'} && !defined $current_value )
|| ( defined $args{'Value'}
&& defined $current_value
&& ( $args{'Value'} eq $current_value ) )
)
{
$ret->as_array( 0, "That is already the current value" );
$ret->as_error(
errno => 1,
do_backtrace => 0,
message => "That is already the current value"
);
return ( $ret->return_value );
}
# First, we truncate the value, if we need to.
#
$args{'Value'} = $self->TruncateValue ( $args{'Column'}, $args{'Value'});
my $method = "Validate" . $args{'Column'};
unless ( $self->$method( $args{'Value'} ) ) {
$ret->as_array( 0, 'Illegal value for ' . $args{'Column'} );
$ret->as_error(
errno => 3,
do_backtrace => 0,
message => "Illegal value for " . $args{'Column'}
);
return ( $ret->return_value );
}
$args{'Table'} = $self->Table();
$args{'PrimaryKeys'} = { $self->PrimaryKeys() };
# The blob handling will destroy $args{'Value'}. But we assign
# that back to the object at the end. this works around that
my $unmunged_value = $args{'Value'};
unless ( $self->_Handle->KnowsBLOBs ) {
# Support for databases which don't deal with LOBs automatically
my $ca = $self->_ClassAccessible();
my $key = $args{'Column'};
if ( $ca->{$key}->{'type'} =~ /^(text|longtext|clob|blob|lob)$/i ) {
my $bhash = $self->_Handle->BLOBParams( $key, $ca->{$key}->{'type'} );
$bhash->{'value'} = $args{'Value'};
$args{'Value'} = $bhash;
}
}
my $val = $self->_Handle->UpdateRecordValue(%args);
unless ($val) {
my $message =
$args{'Column'}
. " could not be set to "
. ( defined $args{'Value'} ? $args{'Value'} : 'undef' ) . ".";
$ret->as_array( 0, $message);
$ret->as_error(
errno => 4,
do_backtrace => 0,
message => $message
);
return ( $ret->return_value );
}
# If we've performed some sort of "functional update"
# then we need to reload the object from the DB to know what's
# really going on. (ex SET Cost = Cost+5)
if ( $args{'IsSQLFunction'} ) {
$self->Load( $self->Id );
}
else {
$self->{'values'}->{"$column"} = $unmunged_value;
}
$ret->as_array( 1, "The new value has been set." );
return ( $ret->return_value );
}
=head2 _Canonicalize PARAMHASH
This routine massages an input value (VALUE) for FIELD into something that's
going to be acceptable.
Takes
=over
=item FIELD
=item VALUE
=item FUNCTION
=back
Takes:
=over
=item FIELD
=item VALUE
=item FUNCTION
=back
Returns a replacement VALUE.
=cut
sub _Canonicalize {
my $self = shift;
my $field = shift;
}
=head2 _Validate FIELD VALUE
Validate that VALUE will be an acceptable value for FIELD.
Currently, this routine does nothing whatsoever.
If it succeeds (which is always the case right now), returns true. Otherwise returns false.
=cut
sub _Validate {
my $self = shift;
my $field = shift;
my $value = shift;
#Check type of input
#If it's null, are nulls permitted?
#If it's an int, check the # of bits
#If it's a string,
#check length
#check for nonprintables
#If it's a blob, check for length
#In an ideal world, if this is a link to another table, check the dependency.
return(1);
}
=head2 TruncateValue KEY VALUE
Truncate a value that's about to be set so that it will fit inside the database'
s idea of how big the column is.
(Actually, it looks at SearchBuilder's concept of the database, not directly into the db).
=cut
sub TruncateValue {
my $self = shift;
my $key = shift;
my $value = shift;
# We don't need to truncate empty things.
return undef unless defined $value;
my $metadata = $self->_ClassAccessible->{$key};
return $value unless $metadata;
my $truncate_to;
if ( $metadata->{'length'} && !$metadata->{'is_numeric'} ) {
$truncate_to = int $metadata->{'length'};
}
elsif ($metadata->{'type'} && $metadata->{'type'} =~ /char\((\d+)\)/ ) {
$truncate_to = $1;
}
return $value unless $truncate_to;
# return asap if length in bytes is smaller than limit
return $value if $truncate_to >= do { use bytes; length $value };
if ( Encode::is_utf8($value) ) {
return Encode::decode_utf8(
substr( Encode::encode_utf8( $value ), 0, $truncate_to ),
Encode::FB_QUIET(),
);
}
else {
# XXX: if it's not UTF-8 then why do we convert it to?
return Encode::encode_utf8( Encode::decode_utf8 (
substr( $value, 0, $truncate_to ), Encode::FB_QUIET(),
) );
}
}
=head2 _Object
_Object takes a single column name and an array reference.
It creates new object instance of class specified in _ClassAccessable
structure and calls LoadById on recently created object with the
current column value as argument. It uses the array reference as
the object constructor's arguments.
Subclasses can override _Object to insert custom access control or
define default contructor arguments.
Note that if you are using a C<Schema> with a C<REFERENCES> field,
this is unnecessary: the method to access the column's value will
automatically turn it into the appropriate object.
=cut
sub _Object {
my $self = shift;
return $self->__Object(@_);
}
sub __Object {
my $self = shift;
my %args = ( Field => '', Args => [], @_ );
my $field = $args{'Field'};
my $class = $self->_Accessible( $field, 'object' );
# Globs magic to be sure that we call 'eval "require $class"' only once
# because eval is quite slow -- cubic@acronis.ru
no strict qw( refs );
my $vglob = ${ $class . '::' }{'VERSION'};
unless ( $vglob && *$vglob{'SCALAR'} ) {
eval "require $class";
die "Couldn't use $class: $@" if ($@);
unless ( $vglob && *$vglob{'SCALAR'} ) {
*{ $class . "::VERSION" } = '-1, By DBIx::SearchBuilder';
}
}
my $object = $class->new( @{ $args{'Args'} } );
$object->LoadById( $self->__Value($field) );
return $object;
}
# load should do a bit of overloading
# if we call it with only one argument, we're trying to load by reference.
# if we call it with a passel of arguments, we're trying to load by value
# The latter is primarily important when we've got a whole set of record that we're
# reading in with a recordset class and want to instantiate objefcts for each record.
=head2 Load
Takes a single argument, $id. Calls LoadById to retrieve the row whose primary key
is $id
=cut
sub Load {
my $self = shift;
return $self->LoadById(@_);
}
=head2 LoadByCol
Takes two arguments, a column and a value. The column can be any table column
which contains unique values. Behavior when using a non-unique value is
undefined
=cut
sub LoadByCol {
my $self = shift;
return $self->LoadByCols(@_);
}
=head2 LoadByCols
Takes a hash of columns and values. Loads the first record that matches all
keys.
The hash's keys are the columns to look at.
The hash's values are either: scalar values to look for
OR has references which contain 'operator' and 'value'
=cut
sub LoadByCols {
my $self = shift;
my %hash = (@_);
my (@bind, @phrases);
foreach my $key (sort keys %hash) {
if (defined $hash{$key} && $hash{$key} ne '') {
my $op;
my $value;
my $function = "?";
if (ref $hash{$key} eq 'HASH') {
$op = $hash{$key}->{operator};
$value = $hash{$key}->{value};
$function = $hash{$key}->{function} || "?";
} else {
$op = '=';
$value = $hash{$key};
}
push @phrases, "$key $op $function";
push @bind, $value;
}
else {
push @phrases, "($key IS NULL OR $key = ?)";
my $meta = $self->_ClassAccessible->{$key};
$meta->{'type'} ||= '';
# TODO: type checking should be done in generic way
if ( $meta->{'is_numeric'} || $meta->{'type'} =~ /INT|NUMERIC|DECIMAL|REAL|DOUBLE|FLOAT/i ) {
push @bind, 0;
} else {
push @bind, '';
}
}
}
my $QueryString = "SELECT * FROM ".$self->Table." WHERE ".
join(' AND ', @phrases) ;
return ($self->_LoadFromSQL($QueryString, @bind));
}
=head2 LoadById
Loads a record by its primary key. Your record class must define a single primary key column.
=cut
sub LoadById {
my ($self, $id) = @_;
return $self->LoadByCols( $self->_PrimaryKey, defined $id? $id: 0 );
}
=head2 LoadByPrimaryKeys
Like LoadById with basic support for compound primary keys.
=cut
sub LoadByPrimaryKeys {
my $self = shift;
my $data = (ref $_[0] eq 'HASH')? $_[0]: {@_};
my %cols=();
foreach (@{$self->_PrimaryKeys}) {
return (0, "Missing PK field: '$_'") unless defined $data->{$_};
$cols{$_}=$data->{$_};
}
return ($self->LoadByCols(%cols));
}
=head2 LoadFromHash
Takes a hashref, such as created by DBIx::SearchBuilder and populates this record's
loaded values hash.
=cut
sub LoadFromHash {
my $self = shift;
my $hashref = shift;
foreach my $f ( keys %$hashref ) {
$self->{'fetched'}{lc $f} = 1;
}
$self->{'values'} = $hashref;
return $self->id();
}
=head2 _LoadFromSQL QUERYSTRING @BIND_VALUES
Load a record as the result of an SQL statement
=cut
sub _LoadFromSQL {
my $self = shift;
my $QueryString = shift;
my @bind_values = (@_);
my $sth = $self->_Handle->SimpleQuery( $QueryString, @bind_values );
#TODO this only gets the first row. we should check if there are more.
return ( 0, "Couldn't execute query: ".$self->_Handle->dbh->errstr ) unless $sth;
$self->{'values'} = $sth->fetchrow_hashref;
$self->{'fetched'} = {};
if ( !$self->{'values'} && $sth->err ) {
return ( 0, "Couldn't fetch row: ". $sth->err );
}
unless ( $self->{'values'} ) {
return ( 0, "Couldn't find row" );
}
## I guess to be consistant with the old code, make sure the primary
## keys exist.
if( grep { not defined } $self->PrimaryKeys ) {
return ( 0, "Missing a primary key?" );
}
foreach my $f ( keys %{$self->{'values'}} ) {
$self->{'fetched'}{lc $f} = 1;
}
return ( 1, "Found Object" );
}
=head2 Create
Takes an array of key-value pairs and drops any keys that aren't known
as columns for this recordtype
=cut
sub Create {
my $self = shift;
my %attribs = @_;
my ($key);
foreach $key ( keys %attribs ) {
if ( $self->_Accessible( $key, 'record-write' ) ) {
$attribs{$key} = $attribs{$key}->id
if UNIVERSAL::isa( $attribs{$key},
'DBIx::SearchBuilder::Record' );
}
if ( defined $attribs{$key} ) {
if ( $attribs{$key} eq '' &&
( $self->_Accessible( $key, 'is_numeric' )
|| ($self->_Accessible( $key, 'type' ) || '') =~ /INT/i ) )
{
$attribs{$key} = 0;
}
}
else {
$attribs{$key} = $self->_Accessible( $key, 'default' )
if $self->_Accessible( $key, 'no_nulls' );
}
#Truncate things that are too long for their datatypes
$attribs{$key} = $self->TruncateValue( $key => $attribs{$key} );
}
unless ( $self->_Handle->KnowsBLOBs ) {
# Support for databases which don't deal with LOBs automatically
my $ca = $self->_ClassAccessible();
foreach $key ( keys %attribs ) {
my $type = $ca->{$key}->{'type'};
next unless $type && $type =~ /^(text|longtext|clob|blob|lob)$/i;
my $bhash = $self->_Handle->BLOBParams( $key, $type );
$bhash->{'value'} = $attribs{$key};
$attribs{$key} = $bhash;
}
}
return ( $self->_Handle->Insert( $self->Table, %attribs ) );
}
=head2 Delete
Delete this record from the database. On failure return a Class::ReturnValue with the error. On success, return 1;
=cut
*delete = \&Delete;
sub Delete {
$_[0]->__Delete;
}
sub __Delete {
my $self = shift;
#TODO Check to make sure the key's not already listed.
#TODO Update internal data structure
## Constructs the where clause.
my @bind=();
my %pkeys=$self->PrimaryKeys();
my $where = 'WHERE ';
foreach my $key (sort keys %pkeys) {
$where .= $key . "=?" . " AND ";
push (@bind, $pkeys{$key});
}
$where =~ s/AND\s$//;
my $QueryString = "DELETE FROM ". $self->Table . ' ' . $where;
my $return = $self->_Handle->SimpleQuery($QueryString, @bind);
if (UNIVERSAL::isa($return, 'Class::ReturnValue')) {
return ($return);
} else {
return(1);
}
}
=head2 Table
Returns or sets the name of the current Table
=cut
sub Table {
my $self = shift;
if (@_) {
$self->{'table'} = shift;
}
return ($self->{'table'});
}
=head2 _Handle
Returns or sets the current DBIx::SearchBuilder::Handle object
=cut
sub _Handle {
my $self = shift;
if (@_) {
$self->{'DBIxHandle'} = shift;
}
return ($self->{'DBIxHandle'});
}
if( eval { require capitalization } ) {
capitalization->unimport( __PACKAGE__ );
}
1;
__END__
=head1 AUTHOR
Jesse Vincent, <jesse@fsck.com>
Enhancements by Ivan Kohler, <ivan-rt@420.am>
Docs by Matt Knopp <mhat@netlag.com>
=head1 SEE ALSO
L<DBIx::SearchBuilder>
=cut
|