1 package DBIx::Class::Storage::DBI;
2 # -*- mode: cperl; cperl-indent-level: 2 -*-
7 use base 'DBIx::Class::Storage';
10 use Carp::Clan qw/^DBIx::Class/;
12 use DBIx::Class::Storage::DBI::Cursor;
13 use DBIx::Class::Storage::Statistics;
16 use Data::Dumper::Concise();
18 # what version of sqlt do we require if deploy() without a ddl_dir is invoked
19 # when changing also adjust the corresponding author_require in Makefile.PL
20 my $minimum_sqlt_version = '0.11002';
23 __PACKAGE__->mk_group_accessors('simple' =>
24 qw/_connect_info _dbi_connect_info _dbh _sql_maker _sql_maker_opts _conn_pid
25 _conn_tid transaction_depth _dbh_autocommit _driver_determined savepoints/
28 # the values for these accessors are picked out (and deleted) from
29 # the attribute hashref passed to connect_info
30 my @storage_options = qw/
31 on_connect_call on_disconnect_call on_connect_do on_disconnect_do
32 disable_sth_caching unsafe auto_savepoint
34 __PACKAGE__->mk_group_accessors('simple' => @storage_options);
37 # default cursor class, overridable in connect_info attributes
38 __PACKAGE__->cursor_class('DBIx::Class::Storage::DBI::Cursor');
40 __PACKAGE__->mk_group_accessors('inherited' => qw/sql_maker_class/);
41 __PACKAGE__->sql_maker_class('DBIx::Class::SQLAHacks');
46 DBIx::Class::Storage::DBI - DBI storage handler
50 my $schema = MySchema->connect('dbi:SQLite:my.db');
52 $schema->storage->debug(1);
54 my @stuff = $schema->storage->dbh_do(
56 my ($storage, $dbh, @args) = @_;
57 $dbh->do("DROP TABLE authors");
62 $schema->resultset('Book')->search({
63 written_on => $schema->storage->datetime_parser(DateTime->now)
68 This class represents the connection to an RDBMS via L<DBI>. See
69 L<DBIx::Class::Storage> for general information. This pod only
70 documents DBI-specific methods and behaviors.
77 my $new = shift->next::method(@_);
79 $new->transaction_depth(0);
80 $new->_sql_maker_opts({});
81 $new->{savepoints} = [];
82 $new->{_in_dbh_do} = 0;
90 This method is normally called by L<DBIx::Class::Schema/connection>, which
91 encapsulates its argument list in an arrayref before passing them here.
93 The argument list may contain:
99 The same 4-element argument set one would normally pass to
100 L<DBI/connect>, optionally followed by
101 L<extra attributes|/DBIx::Class specific connection attributes>
102 recognized by DBIx::Class:
104 $connect_info_args = [ $dsn, $user, $password, \%dbi_attributes?, \%extra_attributes? ];
108 A single code reference which returns a connected
109 L<DBI database handle|DBI/connect> optionally followed by
110 L<extra attributes|/DBIx::Class specific connection attributes> recognized
113 $connect_info_args = [ sub { DBI->connect (...) }, \%extra_attributes? ];
117 A single hashref with all the attributes and the dsn/user/password
120 $connect_info_args = [{
128 $connect_info_args = [{
129 dbh_maker => sub { DBI->connect (...) },
134 This is particularly useful for L<Catalyst> based applications, allowing the
135 following config (L<Config::General> style):
140 dsn dbi:mysql:database=test
147 The C<dsn>/C<user>/C<password> combination can be substituted by the
148 C<dbh_maker> key whose value is a coderef that returns a connected
149 L<DBI database handle|DBI/connect>
153 Please note that the L<DBI> docs recommend that you always explicitly
154 set C<AutoCommit> to either I<0> or I<1>. L<DBIx::Class> further
155 recommends that it be set to I<1>, and that you perform transactions
156 via our L<DBIx::Class::Schema/txn_do> method. L<DBIx::Class> will set it
157 to I<1> if you do not do explicitly set it to zero. This is the default
158 for most DBDs. See L</DBIx::Class and AutoCommit> for details.
160 =head3 DBIx::Class specific connection attributes
162 In addition to the standard L<DBI|DBI/ATTRIBUTES_COMMON_TO_ALL_HANDLES>
163 L<connection|DBI/Database_Handle_Attributes> attributes, DBIx::Class recognizes
164 the following connection options. These options can be mixed in with your other
165 L<DBI> connection attributes, or placed in a seperate hashref
166 (C<\%extra_attributes>) as shown above.
168 Every time C<connect_info> is invoked, any previous settings for
169 these options will be cleared before setting the new ones, regardless of
170 whether any options are specified in the new C<connect_info>.
177 Specifies things to do immediately after connecting or re-connecting to
178 the database. Its value may contain:
184 This contains one SQL statement to execute.
186 =item an array reference
188 This contains SQL statements to execute in order. Each element contains
189 a string or a code reference that returns a string.
191 =item a code reference
193 This contains some code to execute. Unlike code references within an
194 array reference, its return value is ignored.
198 =item on_disconnect_do
200 Takes arguments in the same form as L</on_connect_do> and executes them
201 immediately before disconnecting from the database.
203 Note, this only runs if you explicitly call L</disconnect> on the
206 =item on_connect_call
208 A more generalized form of L</on_connect_do> that calls the specified
209 C<connect_call_METHOD> methods in your storage driver.
211 on_connect_do => 'select 1'
215 on_connect_call => [ [ do_sql => 'select 1' ] ]
217 Its values may contain:
223 Will call the C<connect_call_METHOD> method.
225 =item a code reference
227 Will execute C<< $code->($storage) >>
229 =item an array reference
231 Each value can be a method name or code reference.
233 =item an array of arrays
235 For each array, the first item is taken to be the C<connect_call_> method name
236 or code reference, and the rest are parameters to it.
240 Some predefined storage methods you may use:
246 Executes a SQL string or a code reference that returns a SQL string. This is
247 what L</on_connect_do> and L</on_disconnect_do> use.
255 Will execute the scalar as SQL.
259 Taken to be arguments to L<DBI/do>, the SQL string optionally followed by the
260 attributes hashref and bind values.
262 =item a code reference
264 Will execute C<< $code->($storage) >> and execute the return array refs as
271 Execute any statements necessary to initialize the database session to return
272 and accept datetime/timestamp values used with
273 L<DBIx::Class::InflateColumn::DateTime>.
275 Only necessary for some databases, see your specific storage driver for
276 implementation details.
280 =item on_disconnect_call
282 Takes arguments in the same form as L</on_connect_call> and executes them
283 immediately before disconnecting from the database.
285 Calls the C<disconnect_call_METHOD> methods as opposed to the
286 C<connect_call_METHOD> methods called by L</on_connect_call>.
288 Note, this only runs if you explicitly call L</disconnect> on the
291 =item disable_sth_caching
293 If set to a true value, this option will disable the caching of
294 statement handles via L<DBI/prepare_cached>.
298 Sets the limit dialect. This is useful for JDBC-bridge among others
299 where the remote SQL-dialect cannot be determined by the name of the
300 driver alone. See also L<SQL::Abstract::Limit>.
304 Specifies what characters to use to quote table and column names. If
305 you use this you will want to specify L</name_sep> as well.
307 C<quote_char> expects either a single character, in which case is it
308 is placed on either side of the table/column name, or an arrayref of length
309 2 in which case the table/column name is placed between the elements.
311 For example under MySQL you should use C<< quote_char => '`' >>, and for
312 SQL Server you should use C<< quote_char => [qw/[ ]/] >>.
316 This only needs to be used in conjunction with C<quote_char>, and is used to
317 specify the charecter that seperates elements (schemas, tables, columns) from
318 each other. In most cases this is simply a C<.>.
320 The consequences of not supplying this value is that L<SQL::Abstract>
321 will assume DBIx::Class' uses of aliases to be complete column
322 names. The output will look like I<"me.name"> when it should actually
327 This Storage driver normally installs its own C<HandleError>, sets
328 C<RaiseError> and C<ShowErrorStatement> on, and sets C<PrintError> off on
329 all database handles, including those supplied by a coderef. It does this
330 so that it can have consistent and useful error behavior.
332 If you set this option to a true value, Storage will not do its usual
333 modifications to the database handle's attributes, and instead relies on
334 the settings in your connect_info DBI options (or the values you set in
335 your connection coderef, in the case that you are connecting via coderef).
337 Note that your custom settings can cause Storage to malfunction,
338 especially if you set a C<HandleError> handler that suppresses exceptions
339 and/or disable C<RaiseError>.
343 If this option is true, L<DBIx::Class> will use savepoints when nesting
344 transactions, making it possible to recover from failure in the inner
345 transaction without having to abort all outer transactions.
349 Use this argument to supply a cursor class other than the default
350 L<DBIx::Class::Storage::DBI::Cursor>.
354 Some real-life examples of arguments to L</connect_info> and
355 L<DBIx::Class::Schema/connect>
357 # Simple SQLite connection
358 ->connect_info([ 'dbi:SQLite:./foo.db' ]);
361 ->connect_info([ sub { DBI->connect(...) } ]);
363 # Connect via subref in hashref
365 dbh_maker => sub { DBI->connect(...) },
366 on_connect_do => 'alter session ...',
369 # A bit more complicated
376 { quote_char => q{"}, name_sep => q{.} },
380 # Equivalent to the previous example
386 { AutoCommit => 1, quote_char => q{"}, name_sep => q{.} },
390 # Same, but with hashref as argument
391 # See parse_connect_info for explanation
394 dsn => 'dbi:Pg:dbname=foo',
396 password => 'my_pg_password',
403 # Subref + DBIx::Class-specific connection options
406 sub { DBI->connect(...) },
410 on_connect_do => ['SET search_path TO myschema,otherschema,public'],
411 disable_sth_caching => 1,
421 my ($self, $info_arg) = @_;
423 return $self->_connect_info if !$info_arg;
425 my @args = @$info_arg; # take a shallow copy for further mutilation
426 $self->_connect_info([@args]); # copy for _connect_info
429 # combine/pre-parse arguments depending on invocation style
432 if (ref $args[0] eq 'CODE') { # coderef with optional \%extra_attributes
433 %attrs = %{ $args[1] || {} };
436 elsif (ref $args[0] eq 'HASH') { # single hashref (i.e. Catalyst config)
437 %attrs = %{$args[0]};
439 if (my $code = delete $attrs{dbh_maker}) {
442 my @ignored = grep { delete $attrs{$_} } (qw/dsn user password/);
445 'Attribute(s) %s in connect_info were ignored, as they can not be applied '
446 . "to the result of 'dbh_maker'",
448 join (', ', map { "'$_'" } (@ignored) ),
453 @args = delete @attrs{qw/dsn user password/};
456 else { # otherwise assume dsn/user/password + \%attrs + \%extra_attrs
458 % { $args[3] || {} },
459 % { $args[4] || {} },
461 @args = @args[0,1,2];
464 # Kill sql_maker/_sql_maker_opts, so we get a fresh one with only
465 # the new set of options
466 $self->_sql_maker(undef);
467 $self->_sql_maker_opts({});
470 for my $storage_opt (@storage_options, 'cursor_class') { # @storage_options is declared at the top of the module
471 if(my $value = delete $attrs{$storage_opt}) {
472 $self->$storage_opt($value);
475 for my $sql_maker_opt (qw/limit_dialect quote_char name_sep/) {
476 if(my $opt_val = delete $attrs{$sql_maker_opt}) {
477 $self->_sql_maker_opts->{$sql_maker_opt} = $opt_val;
482 if (ref $args[0] eq 'CODE') {
483 # _connect() never looks past $args[0] in this case
487 %{ $self->_default_dbi_connect_attributes || {} },
492 $self->_dbi_connect_info([@args, keys %attrs ? \%attrs : ()]);
493 $self->_connect_info;
496 sub _default_dbi_connect_attributes {
506 This method is deprecated in favour of setting via L</connect_info>.
510 =head2 on_disconnect_do
512 This method is deprecated in favour of setting via L</connect_info>.
516 sub _parse_connect_do {
517 my ($self, $type) = @_;
519 my $val = $self->$type;
520 return () if not defined $val;
525 push @res, [ 'do_sql', $val ];
526 } elsif (ref($val) eq 'CODE') {
528 } elsif (ref($val) eq 'ARRAY') {
529 push @res, map { [ 'do_sql', $_ ] } @$val;
531 $self->throw_exception("Invalid type for $type: ".ref($val));
539 Arguments: ($subref | $method_name), @extra_coderef_args?
541 Execute the given $subref or $method_name using the new exception-based
542 connection management.
544 The first two arguments will be the storage object that C<dbh_do> was called
545 on and a database handle to use. Any additional arguments will be passed
546 verbatim to the called subref as arguments 2 and onwards.
548 Using this (instead of $self->_dbh or $self->dbh) ensures correct
549 exception handling and reconnection (or failover in future subclasses).
551 Your subref should have no side-effects outside of the database, as
552 there is the potential for your subref to be partially double-executed
553 if the database connection was stale/dysfunctional.
557 my @stuff = $schema->storage->dbh_do(
559 my ($storage, $dbh, @cols) = @_;
560 my $cols = join(q{, }, @cols);
561 $dbh->selectrow_array("SELECT $cols FROM foo");
572 my $dbh = $self->_get_dbh;
574 return $self->$code($dbh, @_) if $self->{_in_dbh_do}
575 || $self->{transaction_depth};
577 local $self->{_in_dbh_do} = 1;
580 my $want_array = wantarray;
585 @result = $self->$code($dbh, @_);
587 elsif(defined $want_array) {
588 $result[0] = $self->$code($dbh, @_);
591 $self->$code($dbh, @_);
595 # ->connected might unset $@ - copy
597 if(!$exception) { return $want_array ? @result : $result[0] }
599 $self->throw_exception($exception) if $self->connected;
601 # We were not connected - reconnect and retry, but let any
602 # exception fall right through this time
603 carp "Retrying $code after catching disconnected exception: $exception"
604 if $ENV{DBIC_DBIRETRY_DEBUG};
605 $self->_populate_dbh;
606 $self->$code($self->_dbh, @_);
609 # This is basically a blend of dbh_do above and DBIx::Class::Storage::txn_do.
610 # It also informs dbh_do to bypass itself while under the direction of txn_do,
611 # via $self->{_in_dbh_do} (this saves some redundant eval and errorcheck, etc)
616 ref $coderef eq 'CODE' or $self->throw_exception
617 ('$coderef must be a CODE reference');
619 return $coderef->(@_) if $self->{transaction_depth} && ! $self->auto_savepoint;
621 local $self->{_in_dbh_do} = 1;
624 my $want_array = wantarray;
633 @result = $coderef->(@_);
635 elsif(defined $want_array) {
636 $result[0] = $coderef->(@_);
644 # ->connected might unset $@ - copy
646 if(!$exception) { return $want_array ? @result : $result[0] }
648 if($tried++ || $self->connected) {
649 eval { $self->txn_rollback };
650 my $rollback_exception = $@;
651 if($rollback_exception) {
652 my $exception_class = "DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION";
653 $self->throw_exception($exception) # propagate nested rollback
654 if $rollback_exception =~ /$exception_class/;
656 $self->throw_exception(
657 "Transaction aborted: ${exception}. "
658 . "Rollback failed: ${rollback_exception}"
661 $self->throw_exception($exception)
664 # We were not connected, and was first try - reconnect and retry
666 carp "Retrying $coderef after catching disconnected exception: $exception"
667 if $ENV{DBIC_DBIRETRY_DEBUG};
668 $self->_populate_dbh;
674 Our C<disconnect> method also performs a rollback first if the
675 database is not in C<AutoCommit> mode.
685 push @actions, ( $self->on_disconnect_call || () );
686 push @actions, $self->_parse_connect_do ('on_disconnect_do');
688 $self->_do_connection_actions(disconnect_call_ => $_) for @actions;
690 $self->_dbh_rollback unless $self->_dbh_autocommit;
692 $self->_dbh->disconnect;
698 =head2 with_deferred_fk_checks
702 =item Arguments: C<$coderef>
704 =item Return Value: The return value of $coderef
708 Storage specific method to run the code ref with FK checks deferred or
709 in MySQL's case disabled entirely.
713 # Storage subclasses should override this
714 sub with_deferred_fk_checks {
715 my ($self, $sub) = @_;
724 =item Arguments: none
726 =item Return Value: 1|0
730 Verifies that the the current database handle is active and ready to execute
731 an SQL statement (i.e. the connection did not get stale, server is still
732 answering, etc.) This method is used internally by L</dbh>.
738 return 0 unless $self->_seems_connected;
741 local $self->_dbh->{RaiseError} = 1;
746 sub _seems_connected {
749 my $dbh = $self->_dbh
752 if(defined $self->_conn_tid && $self->_conn_tid != threads->tid) {
759 return 0 if !$self->_dbh;
762 return $dbh->FETCH('Active');
768 my $dbh = $self->_dbh or return 0;
773 # handle pid changes correctly
774 # NOTE: assumes $self->_dbh is a valid $dbh
778 return if defined $self->_conn_pid && $self->_conn_pid == $$;
780 $self->_dbh->{InactiveDestroy} = 1;
787 sub ensure_connected {
790 unless ($self->connected) {
791 $self->_populate_dbh;
797 Returns a C<$dbh> - a data base handle of class L<DBI>. The returned handle
798 is guaranteed to be healthy by implicitly calling L</connected>, and if
799 necessary performing a reconnection before returning. Keep in mind that this
800 is very B<expensive> on some database engines. Consider using L<dbh_do>
808 if (not $self->_dbh) {
809 $self->_populate_dbh;
811 $self->ensure_connected;
816 # this is the internal "get dbh or connect (don't check)" method
819 $self->_verify_pid if $self->_dbh;
820 $self->_populate_dbh unless $self->_dbh;
824 sub _sql_maker_args {
829 array_datatypes => 1,
830 limit_dialect => $self->_get_dbh,
831 %{$self->_sql_maker_opts}
837 unless ($self->_sql_maker) {
838 my $sql_maker_class = $self->sql_maker_class;
839 $self->ensure_class_loaded ($sql_maker_class);
840 $self->_sql_maker($sql_maker_class->new( $self->_sql_maker_args ));
842 return $self->_sql_maker;
845 # nothing to do by default
852 my @info = @{$self->_dbi_connect_info || []};
853 $self->_dbh(undef); # in case ->connected failed we might get sent here
854 $self->_dbh($self->_connect(@info));
856 $self->_conn_pid($$);
857 $self->_conn_tid(threads->tid) if $INC{'threads.pm'};
859 $self->_determine_driver;
861 # Always set the transaction depth on connect, since
862 # there is no transaction in progress by definition
863 $self->{transaction_depth} = $self->_dbh_autocommit ? 0 : 1;
865 $self->_run_connection_actions unless $self->{_in_determine_driver};
868 sub _run_connection_actions {
872 push @actions, ( $self->on_connect_call || () );
873 push @actions, $self->_parse_connect_do ('on_connect_do');
875 $self->_do_connection_actions(connect_call_ => $_) for @actions;
878 sub _determine_driver {
881 if ((not $self->_driver_determined) && (not $self->{_in_determine_driver})) {
882 my $started_connected = 0;
883 local $self->{_in_determine_driver} = 1;
885 if (ref($self) eq __PACKAGE__) {
887 if ($self->_dbh) { # we are connected
888 $driver = $self->_dbh->{Driver}{Name};
889 $started_connected = 1;
891 # if connect_info is a CODEREF, we have no choice but to connect
892 if (ref $self->_dbi_connect_info->[0] &&
893 Scalar::Util::reftype($self->_dbi_connect_info->[0]) eq 'CODE') {
894 $self->_populate_dbh;
895 $driver = $self->_dbh->{Driver}{Name};
898 # try to use dsn to not require being connected, the driver may still
899 # force a connection in _rebless to determine version
900 ($driver) = $self->_dbi_connect_info->[0] =~ /dbi:([^:]+):/i;
904 my $storage_class = "DBIx::Class::Storage::DBI::${driver}";
905 if ($self->load_optional_class($storage_class)) {
906 mro::set_mro($storage_class, 'c3');
907 bless $self, $storage_class;
912 $self->_driver_determined(1);
914 $self->_init; # run driver-specific initializations
916 $self->_run_connection_actions
917 if !$started_connected && defined $self->_dbh;
921 sub _do_connection_actions {
923 my $method_prefix = shift;
926 if (not ref($call)) {
927 my $method = $method_prefix . $call;
929 } elsif (ref($call) eq 'CODE') {
931 } elsif (ref($call) eq 'ARRAY') {
932 if (ref($call->[0]) ne 'ARRAY') {
933 $self->_do_connection_actions($method_prefix, $_) for @$call;
935 $self->_do_connection_actions($method_prefix, @$_) for @$call;
938 $self->throw_exception (sprintf ("Don't know how to process conection actions of type '%s'", ref($call)) );
944 sub connect_call_do_sql {
946 $self->_do_query(@_);
949 sub disconnect_call_do_sql {
951 $self->_do_query(@_);
954 # override in db-specific backend when necessary
955 sub connect_call_datetime_setup { 1 }
958 my ($self, $action) = @_;
960 if (ref $action eq 'CODE') {
961 $action = $action->($self);
962 $self->_do_query($_) foreach @$action;
965 # Most debuggers expect ($sql, @bind), so we need to exclude
966 # the attribute hash which is the second argument to $dbh->do
967 # furthermore the bind values are usually to be presented
968 # as named arrayref pairs, so wrap those here too
969 my @do_args = (ref $action eq 'ARRAY') ? (@$action) : ($action);
970 my $sql = shift @do_args;
971 my $attrs = shift @do_args;
972 my @bind = map { [ undef, $_ ] } @do_args;
974 $self->_query_start($sql, @bind);
975 $self->_get_dbh->do($sql, $attrs, @do_args);
976 $self->_query_end($sql, @bind);
983 my ($self, @info) = @_;
985 $self->throw_exception("You failed to provide any connection info")
988 my ($old_connect_via, $dbh);
990 if ($INC{'Apache/DBI.pm'} && $ENV{MOD_PERL}) {
991 $old_connect_via = $DBI::connect_via;
992 $DBI::connect_via = 'connect';
996 if(ref $info[0] eq 'CODE') {
1000 $dbh = DBI->connect(@info);
1003 if($dbh && !$self->unsafe) {
1004 my $weak_self = $self;
1005 Scalar::Util::weaken($weak_self);
1006 $dbh->{HandleError} = sub {
1008 $weak_self->throw_exception("DBI Exception: $_[0]");
1011 # the handler may be invoked by something totally out of
1013 croak ("DBI Exception: $_[0]");
1016 $dbh->{ShowErrorStatement} = 1;
1017 $dbh->{RaiseError} = 1;
1018 $dbh->{PrintError} = 0;
1022 $DBI::connect_via = $old_connect_via if $old_connect_via;
1024 $self->throw_exception("DBI Connection failed: " . ($@||$DBI::errstr))
1027 $self->_dbh_autocommit($dbh->{AutoCommit});
1033 my ($self, $name) = @_;
1035 $name = $self->_svp_generate_name
1036 unless defined $name;
1038 $self->throw_exception ("You can't use savepoints outside a transaction")
1039 if $self->{transaction_depth} == 0;
1041 $self->throw_exception ("Your Storage implementation doesn't support savepoints")
1042 unless $self->can('_svp_begin');
1044 push @{ $self->{savepoints} }, $name;
1046 $self->debugobj->svp_begin($name) if $self->debug;
1048 return $self->_svp_begin($name);
1052 my ($self, $name) = @_;
1054 $self->throw_exception ("You can't use savepoints outside a transaction")
1055 if $self->{transaction_depth} == 0;
1057 $self->throw_exception ("Your Storage implementation doesn't support savepoints")
1058 unless $self->can('_svp_release');
1060 if (defined $name) {
1061 $self->throw_exception ("Savepoint '$name' does not exist")
1062 unless grep { $_ eq $name } @{ $self->{savepoints} };
1064 # Dig through the stack until we find the one we are releasing. This keeps
1065 # the stack up to date.
1068 do { $svp = pop @{ $self->{savepoints} } } while $svp ne $name;
1070 $name = pop @{ $self->{savepoints} };
1073 $self->debugobj->svp_release($name) if $self->debug;
1075 return $self->_svp_release($name);
1079 my ($self, $name) = @_;
1081 $self->throw_exception ("You can't use savepoints outside a transaction")
1082 if $self->{transaction_depth} == 0;
1084 $self->throw_exception ("Your Storage implementation doesn't support savepoints")
1085 unless $self->can('_svp_rollback');
1087 if (defined $name) {
1088 # If they passed us a name, verify that it exists in the stack
1089 unless(grep({ $_ eq $name } @{ $self->{savepoints} })) {
1090 $self->throw_exception("Savepoint '$name' does not exist!");
1093 # Dig through the stack until we find the one we are releasing. This keeps
1094 # the stack up to date.
1095 while(my $s = pop(@{ $self->{savepoints} })) {
1096 last if($s eq $name);
1098 # Add the savepoint back to the stack, as a rollback doesn't remove the
1099 # named savepoint, only everything after it.
1100 push(@{ $self->{savepoints} }, $name);
1102 # We'll assume they want to rollback to the last savepoint
1103 $name = $self->{savepoints}->[-1];
1106 $self->debugobj->svp_rollback($name) if $self->debug;
1108 return $self->_svp_rollback($name);
1111 sub _svp_generate_name {
1114 return 'savepoint_'.scalar(@{ $self->{'savepoints'} });
1119 if($self->{transaction_depth} == 0) {
1120 $self->debugobj->txn_begin()
1122 $self->_dbh_begin_work;
1124 elsif ($self->auto_savepoint) {
1127 $self->{transaction_depth}++;
1130 sub _dbh_begin_work {
1133 # if the user is utilizing txn_do - good for him, otherwise we need to
1134 # ensure that the $dbh is healthy on BEGIN.
1135 # We do this via ->dbh_do instead of ->dbh, so that the ->dbh "ping"
1136 # will be replaced by a failure of begin_work itself (which will be
1137 # then retried on reconnect)
1138 if ($self->{_in_dbh_do}) {
1139 $self->_dbh->begin_work;
1141 $self->dbh_do(sub { $_[1]->begin_work });
1147 if ($self->{transaction_depth} == 1) {
1148 my $dbh = $self->_dbh;
1149 $self->debugobj->txn_commit()
1152 $self->{transaction_depth} = 0
1153 if $self->_dbh_autocommit;
1155 elsif($self->{transaction_depth} > 1) {
1156 $self->{transaction_depth}--;
1158 if $self->auto_savepoint;
1164 $self->_dbh->commit;
1169 my $dbh = $self->_dbh;
1171 if ($self->{transaction_depth} == 1) {
1172 $self->debugobj->txn_rollback()
1174 $self->{transaction_depth} = 0
1175 if $self->_dbh_autocommit;
1176 $self->_dbh_rollback;
1178 elsif($self->{transaction_depth} > 1) {
1179 $self->{transaction_depth}--;
1180 if ($self->auto_savepoint) {
1181 $self->svp_rollback;
1186 die DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION->new;
1191 my $exception_class = "DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION";
1192 $error =~ /$exception_class/ and $self->throw_exception($error);
1193 # ensure that a failed rollback resets the transaction depth
1194 $self->{transaction_depth} = $self->_dbh_autocommit ? 0 : 1;
1195 $self->throw_exception($error);
1201 $self->_dbh->rollback;
1204 # This used to be the top-half of _execute. It was split out to make it
1205 # easier to override in NoBindVars without duping the rest. It takes up
1206 # all of _execute's args, and emits $sql, @bind.
1207 sub _prep_for_execute {
1208 my ($self, $op, $extra_bind, $ident, $args) = @_;
1210 if( Scalar::Util::blessed($ident) && $ident->isa("DBIx::Class::ResultSource") ) {
1211 $ident = $ident->from();
1214 my ($sql, @bind) = $self->sql_maker->$op($ident, @$args);
1217 map { ref $_ eq 'ARRAY' ? $_ : [ '!!dummy', $_ ] } @$extra_bind)
1219 return ($sql, \@bind);
1223 sub _fix_bind_params {
1224 my ($self, @bind) = @_;
1226 ### Turn @bind from something like this:
1227 ### ( [ "artist", 1 ], [ "cdid", 1, 3 ] )
1229 ### ( "'1'", "'1'", "'3'" )
1232 if ( defined( $_ && $_->[1] ) ) {
1233 map { qq{'$_'}; } @{$_}[ 1 .. $#$_ ];
1240 my ( $self, $sql, @bind ) = @_;
1242 if ( $self->debug ) {
1243 @bind = $self->_fix_bind_params(@bind);
1245 $self->debugobj->query_start( $sql, @bind );
1250 my ( $self, $sql, @bind ) = @_;
1252 if ( $self->debug ) {
1253 @bind = $self->_fix_bind_params(@bind);
1254 $self->debugobj->query_end( $sql, @bind );
1259 my ($self, $dbh, $op, $extra_bind, $ident, $bind_attributes, @args) = @_;
1261 my ($sql, $bind) = $self->_prep_for_execute($op, $extra_bind, $ident, \@args);
1263 $self->_query_start( $sql, @$bind );
1265 my $sth = $self->sth($sql,$op);
1267 my $placeholder_index = 1;
1269 foreach my $bound (@$bind) {
1270 my $attributes = {};
1271 my($column_name, @data) = @$bound;
1273 if ($bind_attributes) {
1274 $attributes = $bind_attributes->{$column_name}
1275 if defined $bind_attributes->{$column_name};
1278 foreach my $data (@data) {
1279 my $ref = ref $data;
1280 $data = $ref && $ref ne 'ARRAY' ? ''.$data : $data; # stringify args (except arrayrefs)
1282 $sth->bind_param($placeholder_index, $data, $attributes);
1283 $placeholder_index++;
1287 # Can this fail without throwing an exception anyways???
1288 my $rv = $sth->execute();
1289 $self->throw_exception($sth->errstr) if !$rv;
1291 $self->_query_end( $sql, @$bind );
1293 return (wantarray ? ($rv, $sth, @$bind) : $rv);
1298 $self->dbh_do('_dbh_execute', @_); # retry over disconnects
1302 my ($self, $source, $to_insert) = @_;
1304 # redispatch to insert method of storage we reblessed into, if necessary
1305 if (not $self->_driver_determined) {
1306 $self->_determine_driver;
1307 goto $self->can('insert');
1310 my $ident = $source->from;
1311 my $bind_attributes = $self->source_bind_attributes($source);
1313 my $updated_cols = {};
1315 foreach my $col ( $source->columns ) {
1316 if ( !defined $to_insert->{$col} ) {
1317 my $col_info = $source->column_info($col);
1319 if ( $col_info->{auto_nextval} ) {
1320 $updated_cols->{$col} = $to_insert->{$col} = $self->_sequence_fetch(
1322 $col_info->{sequence} ||
1323 $self->_dbh_get_autoinc_seq($self->_get_dbh, $source)
1329 $self->_execute('insert' => [], $source, $bind_attributes, $to_insert);
1331 return $updated_cols;
1334 ## Still not quite perfect, and EXPERIMENTAL
1335 ## Currently it is assumed that all values passed will be "normal", i.e. not
1336 ## scalar refs, or at least, all the same type as the first set, the statement is
1337 ## only prepped once.
1339 my ($self, $source, $cols, $data) = @_;
1341 # redispatch to insert_bulk method of storage we reblessed into, if necessary
1342 if (not $self->_driver_determined) {
1343 $self->_determine_driver;
1344 goto $self->can('insert_bulk');
1348 @colvalues{@$cols} = (0..$#$cols);
1350 for my $i (0..$#$cols) {
1351 my $first_val = $data->[0][$i];
1352 next unless ref $first_val eq 'SCALAR';
1354 $colvalues{ $cols->[$i] } = $first_val;
1355 ## This is probably unnecessary since $rs->populate only looks at the first
1358 # ref $_ eq 'SCALAR' && $$_ eq $$first_val
1359 # } map $data->[$_][$i], (1..$#$data)) == (@$data - 1);
1362 my ($sql, $bind) = $self->_prep_for_execute (
1363 'insert', undef, $source, [\%colvalues]
1367 my $empty_bind = 1 if (not @bind) &&
1368 (grep { ref $_ eq 'SCALAR' } values %colvalues) == @$cols;
1370 if ((not @bind) && (not $empty_bind)) {
1371 $self->throw_exception(
1372 'Cannot insert_bulk without support for placeholders'
1376 $self->_query_start( $sql, @bind );
1377 my $sth = $self->sth($sql);
1381 # bind_param_array doesn't work if there are no binds
1382 $self->_dbh_execute_inserts_with_no_binds( $sth, scalar @$data );
1385 # @bind = map { ref $_ ? ''.$_ : $_ } @bind; # stringify args
1386 $self->_execute_array( $source, $sth, \@bind, $cols, $data );
1390 $self->_query_end( $sql, @bind );
1392 return (wantarray ? ($rv, $sth, @bind) : $rv);
1395 sub _execute_array {
1396 my ($self, $source, $sth, $bind, $cols, $data, @extra) = @_;
1398 my $guard = $self->txn_scope_guard unless $self->{transaction_depth} != 0;
1400 ## This must be an arrayref, else nothing works!
1401 my $tuple_status = [];
1403 ## Get the bind_attributes, if any exist
1404 my $bind_attributes = $self->source_bind_attributes($source);
1406 ## Bind the values and execute
1407 my $placeholder_index = 1;
1409 foreach my $bound (@$bind) {
1411 my $attributes = {};
1412 my ($column_name, $data_index) = @$bound;
1414 if( $bind_attributes ) {
1415 $attributes = $bind_attributes->{$column_name}
1416 if defined $bind_attributes->{$column_name};
1419 my @data = map { $_->[$data_index] } @$data;
1421 $sth->bind_param_array( $placeholder_index, [@data], $attributes );
1422 $placeholder_index++;
1426 $self->_dbh_execute_array($sth, $tuple_status, @extra);
1428 my $err = $@ || $sth->errstr;
1430 # Statement must finish even if there was an exception.
1431 eval { $sth->finish };
1432 $err = $@ unless $err;
1436 ++$i while $i <= $#$tuple_status && !ref $tuple_status->[$i];
1438 $self->throw_exception("Unexpected populate error: $err")
1439 if ($i > $#$tuple_status);
1441 $self->throw_exception(sprintf "%s for populate slice:\n%s",
1442 ($tuple_status->[$i][1] || $err),
1443 Data::Dumper::Concise::Dumper({
1444 map { $cols->[$_] => $data->[$i][$_] } (0 .. $#$cols)
1449 $guard->commit if $guard;
1454 sub _dbh_execute_array {
1455 my ($self, $sth, $tuple_status, @extra) = @_;
1457 return $sth->execute_array({ArrayTupleStatus => $tuple_status});
1460 sub _dbh_execute_inserts_with_no_binds {
1461 my ($self, $sth, $count) = @_;
1463 my $guard = $self->txn_scope_guard unless $self->{transaction_depth} != 0;
1466 my $dbh = $self->_get_dbh;
1467 local $dbh->{RaiseError} = 1;
1468 local $dbh->{PrintError} = 0;
1470 $sth->execute foreach 1..$count;
1474 # Make sure statement is finished even if there was an exception.
1475 eval { $sth->finish };
1476 $exception = $@ unless $exception;
1478 $self->throw_exception($exception) if $exception;
1480 $guard->commit if $guard;
1486 my ($self, $source, @args) = @_;
1488 # redispatch to update method of storage we reblessed into, if necessary
1489 if (not $self->_driver_determined) {
1490 $self->_determine_driver;
1491 goto $self->can('update');
1494 my $bind_attributes = $self->source_bind_attributes($source);
1496 return $self->_execute('update' => [], $source, $bind_attributes, @args);
1501 my $self = shift @_;
1502 my $source = shift @_;
1503 $self->_determine_driver;
1504 my $bind_attrs = $self->source_bind_attributes($source);
1506 return $self->_execute('delete' => [], $source, $bind_attrs, @_);
1509 # We were sent here because the $rs contains a complex search
1510 # which will require a subquery to select the correct rows
1511 # (i.e. joined or limited resultsets)
1513 # Genarating a single PK column subquery is trivial and supported
1514 # by all RDBMS. However if we have a multicolumn PK, things get ugly.
1515 # Look at _multipk_update_delete()
1516 sub _subq_update_delete {
1518 my ($rs, $op, $values) = @_;
1520 my $rsrc = $rs->result_source;
1522 # we already check this, but double check naively just in case. Should be removed soon
1523 my $sel = $rs->_resolved_attrs->{select};
1524 $sel = [ $sel ] unless ref $sel eq 'ARRAY';
1525 my @pcols = $rsrc->primary_columns;
1526 if (@$sel != @pcols) {
1527 $self->throw_exception (
1528 'Subquery update/delete can not be called on resultsets selecting a'
1529 .' number of columns different than the number of primary keys'
1536 $op eq 'update' ? $values : (),
1537 { $pcols[0] => { -in => $rs->as_query } },
1542 return $self->_multipk_update_delete (@_);
1546 # ANSI SQL does not provide a reliable way to perform a multicol-PK
1547 # resultset update/delete involving subqueries. So by default resort
1548 # to simple (and inefficient) delete_all style per-row opearations,
1549 # while allowing specific storages to override this with a faster
1552 sub _multipk_update_delete {
1553 return shift->_per_row_update_delete (@_);
1556 # This is the default loop used to delete/update rows for multi PK
1557 # resultsets, and used by mysql exclusively (because it can't do anything
1560 # We do not use $row->$op style queries, because resultset update/delete
1561 # is not expected to cascade (this is what delete_all/update_all is for).
1563 # There should be no race conditions as the entire operation is rolled
1566 sub _per_row_update_delete {
1568 my ($rs, $op, $values) = @_;
1570 my $rsrc = $rs->result_source;
1571 my @pcols = $rsrc->primary_columns;
1573 my $guard = $self->txn_scope_guard;
1575 # emulate the return value of $sth->execute for non-selects
1576 my $row_cnt = '0E0';
1578 my $subrs_cur = $rs->cursor;
1579 while (my @pks = $subrs_cur->next) {
1582 for my $i (0.. $#pcols) {
1583 $cond->{$pcols[$i]} = $pks[$i];
1588 $op eq 'update' ? $values : (),
1603 # localization is neccessary as
1604 # 1) there is no infrastructure to pass this around before SQLA2
1605 # 2) _select_args sets it and _prep_for_execute consumes it
1606 my $sql_maker = $self->sql_maker;
1607 local $sql_maker->{_dbic_rs_attrs};
1609 return $self->_execute($self->_select_args(@_));
1612 sub _select_args_to_query {
1615 # localization is neccessary as
1616 # 1) there is no infrastructure to pass this around before SQLA2
1617 # 2) _select_args sets it and _prep_for_execute consumes it
1618 my $sql_maker = $self->sql_maker;
1619 local $sql_maker->{_dbic_rs_attrs};
1621 # my ($op, $bind, $ident, $bind_attrs, $select, $cond, $order, $rows, $offset)
1622 # = $self->_select_args($ident, $select, $cond, $attrs);
1623 my ($op, $bind, $ident, $bind_attrs, @args) =
1624 $self->_select_args(@_);
1626 # my ($sql, $prepared_bind) = $self->_prep_for_execute($op, $bind, $ident, [ $select, $cond, $order, $rows, $offset ]);
1627 my ($sql, $prepared_bind) = $self->_prep_for_execute($op, $bind, $ident, \@args);
1628 $prepared_bind ||= [];
1631 ? ($sql, $prepared_bind, $bind_attrs)
1632 : \[ "($sql)", @$prepared_bind ]
1637 my ($self, $ident, $select, $where, $attrs) = @_;
1639 my ($alias2source, $rs_alias) = $self->_resolve_ident_sources ($ident);
1641 my $sql_maker = $self->sql_maker;
1642 $sql_maker->{_dbic_rs_attrs} = {
1648 ? ( _source_handle => $alias2source->{$rs_alias}->handle )
1653 # calculate bind_attrs before possible $ident mangling
1654 my $bind_attrs = {};
1655 for my $alias (keys %$alias2source) {
1656 my $bindtypes = $self->source_bind_attributes ($alias2source->{$alias}) || {};
1657 for my $col (keys %$bindtypes) {
1659 my $fqcn = join ('.', $alias, $col);
1660 $bind_attrs->{$fqcn} = $bindtypes->{$col} if $bindtypes->{$col};
1662 # Unqialified column names are nice, but at the same time can be
1663 # rather ambiguous. What we do here is basically go along with
1664 # the loop, adding an unqualified column slot to $bind_attrs,
1665 # alongside the fully qualified name. As soon as we encounter
1666 # another column by that name (which would imply another table)
1667 # we unset the unqualified slot and never add any info to it
1668 # to avoid erroneous type binding. If this happens the users
1669 # only choice will be to fully qualify his column name
1671 if (exists $bind_attrs->{$col}) {
1672 $bind_attrs->{$col} = {};
1675 $bind_attrs->{$col} = $bind_attrs->{$fqcn};
1682 $attrs->{software_limit}
1684 $sql_maker->_default_limit_syntax eq "GenericSubQ"
1686 $attrs->{software_limit} = 1;
1689 $self->throw_exception("rows attribute must be positive if present")
1690 if (defined($attrs->{rows}) && !($attrs->{rows} > 0));
1692 # MySQL actually recommends this approach. I cringe.
1693 $attrs->{rows} = 2**48 if not defined $attrs->{rows} and defined $attrs->{offset};
1698 # see if we need to tear the prefetch apart (either limited has_many or grouped prefetch)
1699 # otherwise delegate the limiting to the storage, unless software limit was requested
1701 ( $attrs->{rows} && keys %{$attrs->{collapse}} )
1703 ( $attrs->{group_by} && @{$attrs->{group_by}} &&
1704 $attrs->{_prefetch_select} && @{$attrs->{_prefetch_select}} )
1706 ($ident, $select, $where, $attrs)
1707 = $self->_adjust_select_args_for_complex_prefetch ($ident, $select, $where, $attrs);
1709 elsif (! $attrs->{software_limit} ) {
1710 push @limit, $attrs->{rows}, $attrs->{offset};
1714 # This would be the point to deflate anything found in $where
1715 # (and leave $attrs->{bind} intact). Problem is - inflators historically
1716 # expect a row object. And all we have is a resultsource (it is trivial
1717 # to extract deflator coderefs via $alias2source above).
1719 # I don't see a way forward other than changing the way deflators are
1720 # invoked, and that's just bad...
1724 { $attrs->{$_} ? ( $_ => $attrs->{$_} ) : () }
1725 (qw/order_by group_by having/ )
1728 return ('select', $attrs->{bind}, $ident, $bind_attrs, $select, $where, $order, @limit);
1732 # This is the code producing joined subqueries like:
1733 # SELECT me.*, other.* FROM ( SELECT me.* FROM ... ) JOIN other ON ...
1735 sub _adjust_select_args_for_complex_prefetch {
1736 my ($self, $from, $select, $where, $attrs) = @_;
1738 $self->throw_exception ('Nothing to prefetch... how did we get here?!')
1739 if not @{$attrs->{_prefetch_select}};
1741 $self->throw_exception ('Complex prefetches are not supported on resultsets with a custom from attribute')
1742 if (ref $from ne 'ARRAY' || ref $from->[0] ne 'HASH' || ref $from->[1] ne 'ARRAY');
1745 # generate inner/outer attribute lists, remove stuff that doesn't apply
1746 my $outer_attrs = { %$attrs };
1747 delete $outer_attrs->{$_} for qw/where bind rows offset group_by having/;
1749 my $inner_attrs = { %$attrs };
1750 delete $inner_attrs->{$_} for qw/for collapse _prefetch_select _collapse_order_by select as/;
1753 # bring over all non-collapse-induced order_by into the inner query (if any)
1754 # the outer one will have to keep them all
1755 delete $inner_attrs->{order_by};
1756 if (my $ord_cnt = @{$outer_attrs->{order_by}} - @{$outer_attrs->{_collapse_order_by}} ) {
1757 $inner_attrs->{order_by} = [
1758 @{$outer_attrs->{order_by}}[ 0 .. $ord_cnt - 1]
1763 # generate the inner/outer select lists
1764 # for inside we consider only stuff *not* brought in by the prefetch
1765 # on the outside we substitute any function for its alias
1766 my $outer_select = [ @$select ];
1767 my $inner_select = [];
1768 for my $i (0 .. ( @$outer_select - @{$outer_attrs->{_prefetch_select}} - 1) ) {
1769 my $sel = $outer_select->[$i];
1771 if (ref $sel eq 'HASH' ) {
1772 $sel->{-as} ||= $attrs->{as}[$i];
1773 $outer_select->[$i] = join ('.', $attrs->{alias}, ($sel->{-as} || "inner_column_$i") );
1776 push @$inner_select, $sel;
1779 # normalize a copy of $from, so it will be easier to work with further
1780 # down (i.e. promote the initial hashref to an AoH)
1782 $from->[0] = [ $from->[0] ];
1783 my %original_join_info = map { $_->[0]{-alias} => $_->[0] } (@$from);
1786 # decide which parts of the join will remain in either part of
1787 # the outer/inner query
1789 # First we compose a list of which aliases are used in restrictions
1790 # (i.e. conditions/order/grouping/etc). Since we do not have
1791 # introspectable SQLA, we fall back to ugly scanning of raw SQL for
1792 # WHERE, and for pieces of ORDER BY in order to determine which aliases
1793 # need to appear in the resulting sql.
1794 # It may not be very efficient, but it's a reasonable stop-gap
1795 # Also unqualified column names will not be considered, but more often
1796 # than not this is actually ok
1798 # In the same loop we enumerate part of the selection aliases, as
1799 # it requires the same sqla hack for the time being
1800 my ($restrict_aliases, $select_aliases, $prefetch_aliases);
1802 # produce stuff unquoted, so it can be scanned
1803 my $sql_maker = $self->sql_maker;
1804 local $sql_maker->{quote_char};
1805 my $sep = $self->_sql_maker_opts->{name_sep} || '.';
1808 my $non_prefetch_select_sql = $sql_maker->_recurse_fields ($inner_select);
1809 my $prefetch_select_sql = $sql_maker->_recurse_fields ($outer_attrs->{_prefetch_select});
1810 my $where_sql = $sql_maker->where ($where);
1811 my $group_by_sql = $sql_maker->_order_by({
1812 map { $_ => $inner_attrs->{$_} } qw/group_by having/
1814 my @non_prefetch_order_by_chunks = (map
1815 { ref $_ ? $_->[0] : $_ }
1816 $sql_maker->_order_by_chunks ($inner_attrs->{order_by})
1820 for my $alias (keys %original_join_info) {
1821 my $seen_re = qr/\b $alias $sep/x;
1823 for my $piece ($where_sql, $group_by_sql, @non_prefetch_order_by_chunks ) {
1824 if ($piece =~ $seen_re) {
1825 $restrict_aliases->{$alias} = 1;
1829 if ($non_prefetch_select_sql =~ $seen_re) {
1830 $select_aliases->{$alias} = 1;
1833 if ($prefetch_select_sql =~ $seen_re) {
1834 $prefetch_aliases->{$alias} = 1;
1840 # Add any non-left joins to the restriction list (such joins are indeed restrictions)
1841 for my $j (values %original_join_info) {
1842 my $alias = $j->{-alias} or next;
1843 $restrict_aliases->{$alias} = 1 if (
1844 (not $j->{-join_type})
1846 ($j->{-join_type} !~ /^left (?: \s+ outer)? $/xi)
1850 # mark all join parents as mentioned
1851 # (e.g. join => { cds => 'tracks' } - tracks will need to bring cds too )
1852 for my $collection ($restrict_aliases, $select_aliases) {
1853 for my $alias (keys %$collection) {
1854 $collection->{$_} = 1
1855 for (@{ $original_join_info{$alias}{-join_path} || [] });
1859 # construct the inner $from for the subquery
1860 my %inner_joins = (map { %{$_ || {}} } ($restrict_aliases, $select_aliases) );
1862 for my $j (@$from) {
1863 push @inner_from, $j if $inner_joins{$j->[0]{-alias}};
1866 # if a multi-type join was needed in the subquery ("multi" is indicated by
1867 # presence in {collapse}) - add a group_by to simulate the collapse in the subq
1868 unless ($inner_attrs->{group_by}) {
1869 for my $alias (keys %inner_joins) {
1871 # the dot comes from some weirdness in collapse
1872 # remove after the rewrite
1873 if ($attrs->{collapse}{".$alias"}) {
1874 $inner_attrs->{group_by} ||= $inner_select;
1880 # demote the inner_from head
1881 $inner_from[0] = $inner_from[0][0];
1883 # generate the subquery
1884 my $subq = $self->_select_args_to_query (
1891 my $subq_joinspec = {
1892 -alias => $attrs->{alias},
1893 -source_handle => $inner_from[0]{-source_handle},
1894 $attrs->{alias} => $subq,
1897 # Generate the outer from - this is relatively easy (really just replace
1898 # the join slot with the subquery), with a major caveat - we can not
1899 # join anything that is non-selecting (not part of the prefetch), but at
1900 # the same time is a multi-type relationship, as it will explode the result.
1902 # There are two possibilities here
1903 # - either the join is non-restricting, in which case we simply throw it away
1904 # - it is part of the restrictions, in which case we need to collapse the outer
1905 # result by tackling yet another group_by to the outside of the query
1907 # so first generate the outer_from, up to the substitution point
1909 while (my $j = shift @$from) {
1910 if ($j->[0]{-alias} eq $attrs->{alias}) { # time to swap
1915 last; # we'll take care of what's left in $from below
1918 push @outer_from, $j;
1922 # see what's left - throw away if not selecting/restricting
1923 # also throw in a group_by if restricting to guard against
1924 # cross-join explosions
1926 while (my $j = shift @$from) {
1927 my $alias = $j->[0]{-alias};
1929 if ($select_aliases->{$alias} || $prefetch_aliases->{$alias}) {
1930 push @outer_from, $j;
1932 elsif ($restrict_aliases->{$alias}) {
1933 push @outer_from, $j;
1935 # FIXME - this should be obviated by SQLA2, as I'll be able to
1936 # have restrict_inner and restrict_outer... or something to that
1937 # effect... I think...
1939 # FIXME2 - I can't find a clean way to determine if a particular join
1940 # is a multi - instead I am just treating everything as a potential
1941 # explosive join (ribasushi)
1943 # if (my $handle = $j->[0]{-source_handle}) {
1944 # my $rsrc = $handle->resolve;
1945 # ... need to bail out of the following if this is not a multi,
1946 # as it will be much easier on the db ...
1948 $outer_attrs->{group_by} ||= $outer_select;
1953 # demote the outer_from head
1954 $outer_from[0] = $outer_from[0][0];
1956 # This is totally horrific - the $where ends up in both the inner and outer query
1957 # Unfortunately not much can be done until SQLA2 introspection arrives, and even
1958 # then if where conditions apply to the *right* side of the prefetch, you may have
1959 # to both filter the inner select (e.g. to apply a limit) and then have to re-filter
1960 # the outer select to exclude joins you didin't want in the first place
1962 # OTOH it can be seen as a plus: <ash> (notes that this query would make a DBA cry ;)
1963 return (\@outer_from, $outer_select, $where, $outer_attrs);
1966 sub _resolve_ident_sources {
1967 my ($self, $ident) = @_;
1969 my $alias2source = {};
1972 # the reason this is so contrived is that $ident may be a {from}
1973 # structure, specifying multiple tables to join
1974 if ( Scalar::Util::blessed($ident) && $ident->isa("DBIx::Class::ResultSource") ) {
1975 # this is compat mode for insert/update/delete which do not deal with aliases
1976 $alias2source->{me} = $ident;
1979 elsif (ref $ident eq 'ARRAY') {
1983 if (ref $_ eq 'HASH') {
1985 $rs_alias = $tabinfo->{-alias};
1987 if (ref $_ eq 'ARRAY' and ref $_->[0] eq 'HASH') {
1991 $alias2source->{$tabinfo->{-alias}} = $tabinfo->{-source_handle}->resolve
1992 if ($tabinfo->{-source_handle});
1996 return ($alias2source, $rs_alias);
1999 # Takes $ident, \@column_names
2001 # returns { $column_name => \%column_info, ... }
2002 # also note: this adds -result_source => $rsrc to the column info
2005 # my $col_sources = $self->_resolve_column_info($ident, @column_names);
2006 sub _resolve_column_info {
2007 my ($self, $ident, $colnames) = @_;
2008 my ($alias2src, $root_alias) = $self->_resolve_ident_sources($ident);
2010 my $sep = $self->_sql_maker_opts->{name_sep} || '.';
2013 my (%return, %seen_cols);
2015 # compile a global list of column names, to be able to properly
2016 # disambiguate unqualified column names (if at all possible)
2017 for my $alias (keys %$alias2src) {
2018 my $rsrc = $alias2src->{$alias};
2019 for my $colname ($rsrc->columns) {
2020 push @{$seen_cols{$colname}}, $alias;
2025 foreach my $col (@$colnames) {
2026 my ($alias, $colname) = $col =~ m/^ (?: ([^$sep]+) $sep)? (.+) $/x;
2029 # see if the column was seen exactly once (so we know which rsrc it came from)
2030 if ($seen_cols{$colname} and @{$seen_cols{$colname}} == 1) {
2031 $alias = $seen_cols{$colname}[0];
2038 my $rsrc = $alias2src->{$alias};
2039 $return{$col} = $rsrc && {
2040 %{$rsrc->column_info($colname)},
2041 -result_source => $rsrc,
2042 -source_alias => $alias,
2049 # Returns a counting SELECT for a simple count
2050 # query. Abstracted so that a storage could override
2051 # this to { count => 'firstcol' } or whatever makes
2052 # sense as a performance optimization
2054 #my ($self, $source, $rs_attrs) = @_;
2055 return { count => '*' };
2058 # Returns a SELECT which will end up in the subselect
2059 # There may or may not be a group_by, as the subquery
2060 # might have been called to accomodate a limit
2062 # Most databases would be happy with whatever ends up
2063 # here, but some choke in various ways.
2065 sub _subq_count_select {
2066 my ($self, $source, $rs_attrs) = @_;
2067 return $rs_attrs->{group_by} if $rs_attrs->{group_by};
2069 my @pcols = map { join '.', $rs_attrs->{alias}, $_ } ($source->primary_columns);
2070 return @pcols ? \@pcols : [ 1 ];
2073 sub source_bind_attributes {
2074 my ($self, $source) = @_;
2076 my $bind_attributes;
2077 foreach my $column ($source->columns) {
2079 my $data_type = $source->column_info($column)->{data_type} || '';
2080 $bind_attributes->{$column} = $self->bind_attribute_by_data_type($data_type)
2084 return $bind_attributes;
2091 =item Arguments: $ident, $select, $condition, $attrs
2095 Handle a SQL select statement.
2101 my ($ident, $select, $condition, $attrs) = @_;
2102 return $self->cursor_class->new($self, \@_, $attrs);
2107 my ($rv, $sth, @bind) = $self->_select(@_);
2108 my @row = $sth->fetchrow_array;
2109 my @nextrow = $sth->fetchrow_array if @row;
2110 if(@row && @nextrow) {
2111 carp "Query returned more than one row. SQL that returns multiple rows is DEPRECATED for ->find and ->single";
2113 # Need to call finish() to work round broken DBDs
2122 =item Arguments: $sql
2126 Returns a L<DBI> sth (statement handle) for the supplied SQL.
2131 my ($self, $dbh, $sql) = @_;
2133 # 3 is the if_active parameter which avoids active sth re-use
2134 my $sth = $self->disable_sth_caching
2135 ? $dbh->prepare($sql)
2136 : $dbh->prepare_cached($sql, {}, 3);
2138 # XXX You would think RaiseError would make this impossible,
2139 # but apparently that's not true :(
2140 $self->throw_exception($dbh->errstr) if !$sth;
2146 my ($self, $sql) = @_;
2147 $self->dbh_do('_dbh_sth', $sql); # retry over disconnects
2150 sub _dbh_columns_info_for {
2151 my ($self, $dbh, $table) = @_;
2153 if ($dbh->can('column_info')) {
2156 my ($schema,$tab) = $table =~ /^(.+?)\.(.+)$/ ? ($1,$2) : (undef,$table);
2157 my $sth = $dbh->column_info( undef,$schema, $tab, '%' );
2159 while ( my $info = $sth->fetchrow_hashref() ){
2161 $column_info{data_type} = $info->{TYPE_NAME};
2162 $column_info{size} = $info->{COLUMN_SIZE};
2163 $column_info{is_nullable} = $info->{NULLABLE} ? 1 : 0;
2164 $column_info{default_value} = $info->{COLUMN_DEF};
2165 my $col_name = $info->{COLUMN_NAME};
2166 $col_name =~ s/^\"(.*)\"$/$1/;
2168 $result{$col_name} = \%column_info;
2171 return \%result if !$@ && scalar keys %result;
2175 my $sth = $dbh->prepare($self->sql_maker->select($table, undef, \'1 = 0'));
2177 my @columns = @{$sth->{NAME_lc}};
2178 for my $i ( 0 .. $#columns ){
2180 $column_info{data_type} = $sth->{TYPE}->[$i];
2181 $column_info{size} = $sth->{PRECISION}->[$i];
2182 $column_info{is_nullable} = $sth->{NULLABLE}->[$i] ? 1 : 0;
2184 if ($column_info{data_type} =~ m/^(.*?)\((.*?)\)$/) {
2185 $column_info{data_type} = $1;
2186 $column_info{size} = $2;
2189 $result{$columns[$i]} = \%column_info;
2193 foreach my $col (keys %result) {
2194 my $colinfo = $result{$col};
2195 my $type_num = $colinfo->{data_type};
2197 if(defined $type_num && $dbh->can('type_info')) {
2198 my $type_info = $dbh->type_info($type_num);
2199 $type_name = $type_info->{TYPE_NAME} if $type_info;
2200 $colinfo->{data_type} = $type_name if $type_name;
2207 sub columns_info_for {
2208 my ($self, $table) = @_;
2209 $self->_dbh_columns_info_for ($self->_get_dbh, $table);
2212 =head2 last_insert_id
2214 Return the row id of the last insert.
2218 sub _dbh_last_insert_id {
2219 # All Storage's need to register their own _dbh_last_insert_id
2220 # the old SQLite-based method was highly inappropriate
2223 my $class = ref $self;
2224 $self->throw_exception (<<EOE);
2226 No _dbh_last_insert_id() method found in $class.
2227 Since the method of obtaining the autoincrement id of the last insert
2228 operation varies greatly between different databases, this method must be
2229 individually implemented for every storage class.
2233 sub last_insert_id {
2235 $self->_dbh_last_insert_id ($self->_dbh, @_);
2238 =head2 _native_data_type
2242 =item Arguments: $type_name
2246 This API is B<EXPERIMENTAL>, will almost definitely change in the future, and
2247 currently only used by L<::AutoCast|DBIx::Class::Storage::DBI::AutoCast> and
2248 L<::Sybase|DBIx::Class::Storage::DBI::Sybase>.
2250 The default implementation returns C<undef>, implement in your Storage driver if
2251 you need this functionality.
2253 Should map types from other databases to the native RDBMS type, for example
2254 C<VARCHAR2> to C<VARCHAR>.
2256 Types with modifiers should map to the underlying data type. For example,
2257 C<INTEGER AUTO_INCREMENT> should become C<INTEGER>.
2259 Composite types should map to the container type, for example
2260 C<ENUM(foo,bar,baz)> becomes C<ENUM>.
2264 sub _native_data_type {
2265 #my ($self, $data_type) = @_;
2269 # Check if placeholders are supported at all
2270 sub _placeholders_supported {
2272 my $dbh = $self->_get_dbh;
2274 # some drivers provide a $dbh attribute (e.g. Sybase and $dbh->{syb_dynamic_supported})
2275 # but it is inaccurate more often than not
2277 local $dbh->{PrintError} = 0;
2278 local $dbh->{RaiseError} = 1;
2279 $dbh->do('select ?', {}, 1);
2284 # Check if placeholders bound to non-string types throw exceptions
2286 sub _typeless_placeholders_supported {
2288 my $dbh = $self->_get_dbh;
2291 local $dbh->{PrintError} = 0;
2292 local $dbh->{RaiseError} = 1;
2293 # this specifically tests a bind that is NOT a string
2294 $dbh->do('select 1 where 1 = ?', {}, 1);
2301 Returns the database driver name.
2308 if (not $self->_driver_determined) {
2309 $self->_determine_driver;
2310 goto $self->can ('sqlt_type');
2313 $self->_get_dbh->{Driver}->{Name};
2316 =head2 bind_attribute_by_data_type
2318 Given a datatype from column info, returns a database specific bind
2319 attribute for C<< $dbh->bind_param($val,$attribute) >> or nothing if we will
2320 let the database planner just handle it.
2322 Generally only needed for special case column types, like bytea in postgres.
2326 sub bind_attribute_by_data_type {
2330 =head2 is_datatype_numeric
2332 Given a datatype from column_info, returns a boolean value indicating if
2333 the current RDBMS considers it a numeric value. This controls how
2334 L<DBIx::Class::Row/set_column> decides whether to mark the column as
2335 dirty - when the datatype is deemed numeric a C<< != >> comparison will
2336 be performed instead of the usual C<eq>.
2340 sub is_datatype_numeric {
2341 my ($self, $dt) = @_;
2343 return 0 unless $dt;
2345 return $dt =~ /^ (?:
2346 numeric | int(?:eger)? | (?:tiny|small|medium|big)int | dec(?:imal)? | real | float | double (?: \s+ precision)? | (?:big)?serial
2351 =head2 create_ddl_dir (EXPERIMENTAL)
2355 =item Arguments: $schema \@databases, $version, $directory, $preversion, \%sqlt_args
2359 Creates a SQL file based on the Schema, for each of the specified
2360 database engines in C<\@databases> in the given directory.
2361 (note: specify L<SQL::Translator> names, not L<DBI> driver names).
2363 Given a previous version number, this will also create a file containing
2364 the ALTER TABLE statements to transform the previous schema into the
2365 current one. Note that these statements may contain C<DROP TABLE> or
2366 C<DROP COLUMN> statements that can potentially destroy data.
2368 The file names are created using the C<ddl_filename> method below, please
2369 override this method in your schema if you would like a different file
2370 name format. For the ALTER file, the same format is used, replacing
2371 $version in the name with "$preversion-$version".
2373 See L<SQL::Translator/METHODS> for a list of values for C<\%sqlt_args>.
2374 The most common value for this would be C<< { add_drop_table => 1 } >>
2375 to have the SQL produced include a C<DROP TABLE> statement for each table
2376 created. For quoting purposes supply C<quote_table_names> and
2377 C<quote_field_names>.
2379 If no arguments are passed, then the following default values are assumed:
2383 =item databases - ['MySQL', 'SQLite', 'PostgreSQL']
2385 =item version - $schema->schema_version
2387 =item directory - './'
2389 =item preversion - <none>
2393 By default, C<\%sqlt_args> will have
2395 { add_drop_table => 1, ignore_constraint_names => 1, ignore_index_names => 1 }
2397 merged with the hash passed in. To disable any of those features, pass in a
2398 hashref like the following
2400 { ignore_constraint_names => 0, # ... other options }
2403 Note that this feature is currently EXPERIMENTAL and may not work correctly
2404 across all databases, or fully handle complex relationships.
2406 WARNING: Please check all SQL files created, before applying them.
2410 sub create_ddl_dir {
2411 my ($self, $schema, $databases, $version, $dir, $preversion, $sqltargs) = @_;
2413 if(!$dir || !-d $dir) {
2414 carp "No directory given, using ./\n";
2417 $databases ||= ['MySQL', 'SQLite', 'PostgreSQL'];
2418 $databases = [ $databases ] if(ref($databases) ne 'ARRAY');
2420 my $schema_version = $schema->schema_version || '1.x';
2421 $version ||= $schema_version;
2424 add_drop_table => 1,
2425 ignore_constraint_names => 1,
2426 ignore_index_names => 1,
2430 $self->throw_exception("Can't create a ddl file without SQL::Translator: " . $self->_sqlt_version_error)
2431 if !$self->_sqlt_version_ok;
2433 my $sqlt = SQL::Translator->new( $sqltargs );
2435 $sqlt->parser('SQL::Translator::Parser::DBIx::Class');
2436 my $sqlt_schema = $sqlt->translate({ data => $schema })
2437 or $self->throw_exception ($sqlt->error);
2439 foreach my $db (@$databases) {
2441 $sqlt->{schema} = $sqlt_schema;
2442 $sqlt->producer($db);
2445 my $filename = $schema->ddl_filename($db, $version, $dir);
2446 if (-e $filename && ($version eq $schema_version )) {
2447 # if we are dumping the current version, overwrite the DDL
2448 carp "Overwriting existing DDL file - $filename";
2452 my $output = $sqlt->translate;
2454 carp("Failed to translate to $db, skipping. (" . $sqlt->error . ")");
2457 if(!open($file, ">$filename")) {
2458 $self->throw_exception("Can't open $filename for writing ($!)");
2461 print $file $output;
2464 next unless ($preversion);
2466 require SQL::Translator::Diff;
2468 my $prefilename = $schema->ddl_filename($db, $preversion, $dir);
2469 if(!-e $prefilename) {
2470 carp("No previous schema file found ($prefilename)");
2474 my $difffile = $schema->ddl_filename($db, $version, $dir, $preversion);
2476 carp("Overwriting existing diff file - $difffile");
2482 my $t = SQL::Translator->new($sqltargs);
2487 or $self->throw_exception ($t->error);
2489 my $out = $t->translate( $prefilename )
2490 or $self->throw_exception ($t->error);
2492 $source_schema = $t->schema;
2494 $source_schema->name( $prefilename )
2495 unless ( $source_schema->name );
2498 # The "new" style of producers have sane normalization and can support
2499 # diffing a SQL file against a DBIC->SQLT schema. Old style ones don't
2500 # And we have to diff parsed SQL against parsed SQL.
2501 my $dest_schema = $sqlt_schema;
2503 unless ( "SQL::Translator::Producer::$db"->can('preprocess_schema') ) {
2504 my $t = SQL::Translator->new($sqltargs);
2509 or $self->throw_exception ($t->error);
2511 my $out = $t->translate( $filename )
2512 or $self->throw_exception ($t->error);
2514 $dest_schema = $t->schema;
2516 $dest_schema->name( $filename )
2517 unless $dest_schema->name;
2520 my $diff = SQL::Translator::Diff::schema_diff($source_schema, $db,
2524 if(!open $file, ">$difffile") {
2525 $self->throw_exception("Can't write to $difffile ($!)");
2533 =head2 deployment_statements
2537 =item Arguments: $schema, $type, $version, $directory, $sqlt_args
2541 Returns the statements used by L</deploy> and L<DBIx::Class::Schema/deploy>.
2543 The L<SQL::Translator> (not L<DBI>) database driver name can be explicitly
2544 provided in C<$type>, otherwise the result of L</sqlt_type> is used as default.
2546 C<$directory> is used to return statements from files in a previously created
2547 L</create_ddl_dir> directory and is optional. The filenames are constructed
2548 from L<DBIx::Class::Schema/ddl_filename>, the schema name and the C<$version>.
2550 If no C<$directory> is specified then the statements are constructed on the
2551 fly using L<SQL::Translator> and C<$version> is ignored.
2553 See L<SQL::Translator/METHODS> for a list of values for C<$sqlt_args>.
2557 sub deployment_statements {
2558 my ($self, $schema, $type, $version, $dir, $sqltargs) = @_;
2559 $type ||= $self->sqlt_type;
2560 $version ||= $schema->schema_version || '1.x';
2562 my $filename = $schema->ddl_filename($type, $version, $dir);
2566 open($file, "<$filename")
2567 or $self->throw_exception("Can't open $filename ($!)");
2570 return join('', @rows);
2573 $self->throw_exception("Can't deploy without either SQL::Translator or a ddl_dir: " . $self->_sqlt_version_error )
2574 if !$self->_sqlt_version_ok;
2576 # sources needs to be a parser arg, but for simplicty allow at top level
2578 $sqltargs->{parser_args}{sources} = delete $sqltargs->{sources}
2579 if exists $sqltargs->{sources};
2581 my $tr = SQL::Translator->new(
2582 producer => "SQL::Translator::Producer::${type}",
2584 parser => 'SQL::Translator::Parser::DBIx::Class',
2587 return $tr->translate;
2591 my ($self, $schema, $type, $sqltargs, $dir) = @_;
2594 return if($line =~ /^--/);
2596 # next if($line =~ /^DROP/m);
2597 return if($line =~ /^BEGIN TRANSACTION/m);
2598 return if($line =~ /^COMMIT/m);
2599 return if $line =~ /^\s+$/; # skip whitespace only
2600 $self->_query_start($line);
2602 # do a dbh_do cycle here, as we need some error checking in
2603 # place (even though we will ignore errors)
2604 $self->dbh_do (sub { $_[1]->do($line) });
2607 carp qq{$@ (running "${line}")};
2609 $self->_query_end($line);
2611 my @statements = $self->deployment_statements($schema, $type, undef, $dir, { %{ $sqltargs || {} }, no_comments => 1 } );
2612 if (@statements > 1) {
2613 foreach my $statement (@statements) {
2614 $deploy->( $statement );
2617 elsif (@statements == 1) {
2618 foreach my $line ( split(";\n", $statements[0])) {
2624 =head2 datetime_parser
2626 Returns the datetime parser class
2630 sub datetime_parser {
2632 return $self->{datetime_parser} ||= do {
2633 $self->build_datetime_parser(@_);
2637 =head2 datetime_parser_type
2639 Defines (returns) the datetime parser class - currently hardwired to
2640 L<DateTime::Format::MySQL>
2644 sub datetime_parser_type { "DateTime::Format::MySQL"; }
2646 =head2 build_datetime_parser
2648 See L</datetime_parser>
2652 sub build_datetime_parser {
2653 if (not $_[0]->_driver_determined) {
2654 $_[0]->_determine_driver;
2655 goto $_[0]->can('build_datetime_parser');
2659 my $type = $self->datetime_parser_type(@_);
2660 $self->ensure_class_loaded ($type);
2665 =head2 is_replicating
2667 A boolean that reports if a particular L<DBIx::Class::Storage::DBI> is set to
2668 replicate from a master database. Default is undef, which is the result
2669 returned by databases that don't support replication.
2673 sub is_replicating {
2678 =head2 lag_behind_master
2680 Returns a number that represents a certain amount of lag behind a master db
2681 when a given storage is replicating. The number is database dependent, but
2682 starts at zero and increases with the amount of lag. Default in undef
2686 sub lag_behind_master {
2690 # SQLT version handling
2692 my $_sqlt_version_ok; # private
2693 my $_sqlt_version_error; # private
2695 sub _sqlt_version_ok {
2696 if (!defined $_sqlt_version_ok) {
2697 eval "use SQL::Translator $minimum_sqlt_version";
2699 $_sqlt_version_ok = 0;
2700 $_sqlt_version_error = $@;
2703 $_sqlt_version_ok = 1;
2706 return $_sqlt_version_ok;
2709 sub _sqlt_version_error {
2710 shift->_sqlt_version_ok unless defined $_sqlt_version_ok;
2711 return $_sqlt_version_error;
2714 sub _sqlt_minimum_version { $minimum_sqlt_version };
2720 $self->_verify_pid if $self->_dbh;
2722 # some databases need this to stop spewing warnings
2723 if (my $dbh = $self->_dbh) {
2725 eval { $dbh->disconnect };
2735 =head2 DBIx::Class and AutoCommit
2737 DBIx::Class can do some wonderful magic with handling exceptions,
2738 disconnections, and transactions when you use C<< AutoCommit => 1 >>
2739 (the default) combined with C<txn_do> for transaction support.
2741 If you set C<< AutoCommit => 0 >> in your connect info, then you are always
2742 in an assumed transaction between commits, and you're telling us you'd
2743 like to manage that manually. A lot of the magic protections offered by
2744 this module will go away. We can't protect you from exceptions due to database
2745 disconnects because we don't know anything about how to restart your
2746 transactions. You're on your own for handling all sorts of exceptional
2747 cases if you choose the C<< AutoCommit => 0 >> path, just as you would
2753 Matt S. Trout <mst@shadowcatsystems.co.uk>
2755 Andy Grundman <andy@hybridized.org>
2759 You may distribute this code under the same terms as Perl itself.