1 package DBIx::Class::Storage::DBI;
2 # -*- mode: cperl; cperl-indent-level: 2 -*-
4 use base 'DBIx::Class::Storage';
8 use Carp::Clan qw/^DBIx::Class/;
10 use SQL::Abstract::Limit;
11 use DBIx::Class::Storage::DBI::Cursor;
12 use DBIx::Class::Storage::Statistics;
13 use Scalar::Util qw/blessed weaken/;
15 __PACKAGE__->mk_group_accessors('simple' =>
16 qw/_connect_info _dbi_connect_info _dbh _sql_maker _sql_maker_opts
17 _conn_pid _conn_tid transaction_depth _dbh_autocommit savepoints/
20 # the values for these accessors are picked out (and deleted) from
21 # the attribute hashref passed to connect_info
22 my @storage_options = qw/
23 on_connect_do on_disconnect_do disable_sth_caching unsafe auto_savepoint
25 __PACKAGE__->mk_group_accessors('simple' => @storage_options);
28 # default cursor class, overridable in connect_info attributes
29 __PACKAGE__->cursor_class('DBIx::Class::Storage::DBI::Cursor');
31 __PACKAGE__->mk_group_accessors('inherited' => qw/sql_maker_class/);
32 __PACKAGE__->sql_maker_class('DBIC::SQL::Abstract');
36 package # Hide from PAUSE
37 DBIC::SQL::Abstract; # Would merge upstream, but nate doesn't reply :(
39 use base qw/SQL::Abstract::Limit/;
41 # This prevents the caching of $dbh in S::A::L, I believe
43 my $self = shift->SUPER::new(@_);
45 # If limit_dialect is a ref (like a $dbh), go ahead and replace
46 # it with what it resolves to:
47 $self->{limit_dialect} = $self->_find_syntax($self->{limit_dialect})
48 if ref $self->{limit_dialect};
54 my ($self, $sql, $order, $rows, $offset ) = @_;
57 my $last = $rows + $offset;
58 my ( $order_by ) = $self->_order_by( $order );
63 SELECT Q1.*, ROW_NUMBER() OVER( ) AS ROW_NUM FROM (
68 WHERE ROW_NUM BETWEEN $offset AND $last
74 # While we're at it, this should make LIMIT queries more efficient,
75 # without digging into things too deeply
76 use Scalar::Util 'blessed';
78 my ($self, $syntax) = @_;
79 my $dbhname = blessed($syntax) ? $syntax->{Driver}{Name} : $syntax;
80 if(ref($self) && $dbhname && $dbhname eq 'DB2') {
81 return 'RowNumberOver';
84 $self->{_cached_syntax} ||= $self->SUPER::_find_syntax($syntax);
88 my ($self, $table, $fields, $where, $order, @rest) = @_;
89 if (ref $table eq 'SCALAR') {
92 elsif (not ref $table) {
93 $table = $self->_quote($table);
95 local $self->{rownum_hack_count} = 1
96 if (defined $rest[0] && $self->{limit_dialect} eq 'RowNum');
97 @rest = (-1) unless defined $rest[0];
98 die "LIMIT 0 Does Not Compute" if $rest[0] == 0;
99 # and anyway, SQL::Abstract::Limit will cause a barf if we don't first
100 local $self->{having_bind} = [];
101 my ($sql, @ret) = $self->SUPER::select(
102 $table, $self->_recurse_fields($fields), $where, $order, @rest
107 $self->{for} eq 'update' ? ' FOR UPDATE' :
108 $self->{for} eq 'shared' ? ' FOR SHARE' :
113 return wantarray ? ($sql, @ret, @{$self->{having_bind}}) : $sql;
119 $table = $self->_quote($table) unless ref($table);
120 $self->SUPER::insert($table, @_);
126 $table = $self->_quote($table) unless ref($table);
127 $self->SUPER::update($table, @_);
133 $table = $self->_quote($table) unless ref($table);
134 $self->SUPER::delete($table, @_);
140 return $_[1].$self->_order_by($_[2]);
142 return $self->SUPER::_emulate_limit(@_);
146 sub _recurse_fields {
147 my ($self, $fields, $params) = @_;
148 my $ref = ref $fields;
149 return $self->_quote($fields) unless $ref;
150 return $$fields if $ref eq 'SCALAR';
152 if ($ref eq 'ARRAY') {
153 return join(', ', map {
154 $self->_recurse_fields($_)
155 .(exists $self->{rownum_hack_count} && !($params && $params->{no_rownum_hack})
156 ? ' AS col'.$self->{rownum_hack_count}++
159 } elsif ($ref eq 'HASH') {
160 foreach my $func (keys %$fields) {
161 return $self->_sqlcase($func)
162 .'( '.$self->_recurse_fields($fields->{$func}).' )';
171 if (ref $_[0] eq 'HASH') {
172 if (defined $_[0]->{group_by}) {
173 $ret = $self->_sqlcase(' group by ')
174 .$self->_recurse_fields($_[0]->{group_by}, { no_rownum_hack => 1 });
176 if (defined $_[0]->{having}) {
178 ($frag, @extra) = $self->_recurse_where($_[0]->{having});
179 push(@{$self->{having_bind}}, @extra);
180 $ret .= $self->_sqlcase(' having ').$frag;
182 if (defined $_[0]->{order_by}) {
183 $ret .= $self->_order_by($_[0]->{order_by});
185 } elsif (ref $_[0] eq 'SCALAR') {
186 $ret = $self->_sqlcase(' order by ').${ $_[0] };
187 } elsif (ref $_[0] eq 'ARRAY' && @{$_[0]}) {
188 my @order = @{+shift};
189 $ret = $self->_sqlcase(' order by ')
191 my $r = $self->_order_by($_, @_);
192 $r =~ s/^ ?ORDER BY //i;
196 $ret = $self->SUPER::_order_by(@_);
201 sub _order_directions {
202 my ($self, $order) = @_;
203 $order = $order->{order_by} if ref $order eq 'HASH';
204 return $self->SUPER::_order_directions($order);
208 my ($self, $from) = @_;
209 if (ref $from eq 'ARRAY') {
210 return $self->_recurse_from(@$from);
211 } elsif (ref $from eq 'HASH') {
212 return $self->_make_as($from);
214 return $from; # would love to quote here but _table ends up getting called
215 # twice during an ->select without a limit clause due to
216 # the way S::A::Limit->select works. should maybe consider
217 # bypassing this and doing S::A::select($self, ...) in
218 # our select method above. meantime, quoting shims have
219 # been added to select/insert/update/delete here
224 my ($self, $from, @join) = @_;
226 push(@sqlf, $self->_make_as($from));
227 foreach my $j (@join) {
230 # check whether a join type exists
231 my $join_clause = '';
232 my $to_jt = ref($to) eq 'ARRAY' ? $to->[0] : $to;
233 if (ref($to_jt) eq 'HASH' and exists($to_jt->{-join_type})) {
234 $join_clause = ' '.uc($to_jt->{-join_type}).' JOIN ';
236 $join_clause = ' JOIN ';
238 push(@sqlf, $join_clause);
240 if (ref $to eq 'ARRAY') {
241 push(@sqlf, '(', $self->_recurse_from(@$to), ')');
243 push(@sqlf, $self->_make_as($to));
245 push(@sqlf, ' ON ', $self->_join_condition($on));
247 return join('', @sqlf);
251 my ($self, $from) = @_;
252 return join(' ', map { (ref $_ eq 'SCALAR' ? $$_ : $self->_quote($_)) }
253 reverse each %{$self->_skip_options($from)});
257 my ($self, $hash) = @_;
259 $clean_hash->{$_} = $hash->{$_}
260 for grep {!/^-/} keys %$hash;
264 sub _join_condition {
265 my ($self, $cond) = @_;
266 if (ref $cond eq 'HASH') {
271 # XXX no throw_exception() in this package and croak() fails with strange results
272 Carp::croak(ref($v) . qq{ reference arguments are not supported in JOINS - try using \"..." instead'})
273 if ref($v) ne 'SCALAR';
277 my $x = '= '.$self->_quote($v); $j{$_} = \$x;
280 return scalar($self->_recurse_where(\%j));
281 } elsif (ref $cond eq 'ARRAY') {
282 return join(' OR ', map { $self->_join_condition($_) } @$cond);
284 die "Can't handle this yet!";
289 my ($self, $label) = @_;
290 return '' unless defined $label;
291 return "*" if $label eq '*';
292 return $label unless $self->{quote_char};
293 if(ref $self->{quote_char} eq "ARRAY"){
294 return $self->{quote_char}->[0] . $label . $self->{quote_char}->[1]
295 if !defined $self->{name_sep};
296 my $sep = $self->{name_sep};
297 return join($self->{name_sep},
298 map { $self->{quote_char}->[0] . $_ . $self->{quote_char}->[1] }
299 split(/\Q$sep\E/,$label));
301 return $self->SUPER::_quote($label);
306 $self->{limit_dialect} = shift if @_;
307 return $self->{limit_dialect};
312 $self->{quote_char} = shift if @_;
313 return $self->{quote_char};
318 $self->{name_sep} = shift if @_;
319 return $self->{name_sep};
322 } # End of BEGIN block
326 DBIx::Class::Storage::DBI - DBI storage handler
330 my $schema = MySchema->connect('dbi:SQLite:my.db');
332 $schema->storage->debug(1);
333 $schema->dbh_do("DROP TABLE authors");
335 $schema->resultset('Book')->search({
336 written_on => $schema->storage->datetime_parser(DateTime->now)
341 This class represents the connection to an RDBMS via L<DBI>. See
342 L<DBIx::Class::Storage> for general information. This pod only
343 documents DBI-specific methods and behaviors.
350 my $new = shift->next::method(@_);
352 $new->transaction_depth(0);
353 $new->_sql_maker_opts({});
354 $new->{savepoints} = [];
355 $new->{_in_dbh_do} = 0;
356 $new->{_dbh_gen} = 0;
363 This method is normally called by L<DBIx::Class::Schema/connection>, which
364 encapsulates its argument list in an arrayref before passing them here.
366 The argument list may contain:
372 The same 4-element argument set one would normally pass to
373 L<DBI/connect>, optionally followed by
374 L<extra attributes|/DBIx::Class specific connection attributes>
375 recognized by DBIx::Class:
377 $connect_info_args = [ $dsn, $user, $password, \%dbi_attributes?, \%extra_attributes? ];
381 A single code reference which returns a connected
382 L<DBI database handle|DBI/connect> optionally followed by
383 L<extra attributes|/DBIx::Class specific connection attributes> recognized
386 $connect_info_args = [ sub { DBI->connect (...) }, \%extra_attributes? ];
390 A single hashref with all the attributes and the dsn/user/password
393 $connect_info_args = [{
401 This is particularly useful for L<Catalyst> based applications, allowing the
402 following config (L<Config::General> style):
407 dsn dbi:mysql:database=test
416 Please note that the L<DBI> docs recommend that you always explicitly
417 set C<AutoCommit> to either I<0> or I<1>. L<DBIx::Class> further
418 recommends that it be set to I<1>, and that you perform transactions
419 via our L<DBIx::Class::Schema/txn_do> method. L<DBIx::Class> will set it
420 to I<1> if you do not do explicitly set it to zero. This is the default
421 for most DBDs. See L</DBIx::Class and AutoCommit> for details.
423 =head3 DBIx::Class specific connection attributes
425 In addition to the standard L<DBI|DBI/ATTRIBUTES_COMMON_TO_ALL_HANDLES>
426 L<connection|DBI/Database_Handle_Attributes> attributes, DBIx::Class recognizes
427 the following connection options. These options can be mixed in with your other
428 L<DBI> connection attributes, or placed in a seperate hashref
429 (C<\%extra_attributes>) as shown above.
431 Every time C<connect_info> is invoked, any previous settings for
432 these options will be cleared before setting the new ones, regardless of
433 whether any options are specified in the new C<connect_info>.
440 Specifies things to do immediately after connecting or re-connecting to
441 the database. Its value may contain:
445 =item an array reference
447 This contains SQL statements to execute in order. Each element contains
448 a string or a code reference that returns a string.
450 =item a code reference
452 This contains some code to execute. Unlike code references within an
453 array reference, its return value is ignored.
457 =item on_disconnect_do
459 Takes arguments in the same form as L</on_connect_do> and executes them
460 immediately before disconnecting from the database.
462 Note, this only runs if you explicitly call L</disconnect> on the
465 =item disable_sth_caching
467 If set to a true value, this option will disable the caching of
468 statement handles via L<DBI/prepare_cached>.
472 Sets the limit dialect. This is useful for JDBC-bridge among others
473 where the remote SQL-dialect cannot be determined by the name of the
474 driver alone. See also L<SQL::Abstract::Limit>.
478 Specifies what characters to use to quote table and column names. If
479 you use this you will want to specify L</name_sep> as well.
481 C<quote_char> expects either a single character, in which case is it
482 is placed on either side of the table/column name, or an arrayref of length
483 2 in which case the table/column name is placed between the elements.
485 For example under MySQL you should use C<< quote_char => '`' >>, and for
486 SQL Server you should use C<< quote_char => [qw/[ ]/] >>.
490 This only needs to be used in conjunction with C<quote_char>, and is used to
491 specify the charecter that seperates elements (schemas, tables, columns) from
492 each other. In most cases this is simply a C<.>.
494 The consequences of not supplying this value is that L<SQL::Abstract>
495 will assume DBIx::Class' uses of aliases to be complete column
496 names. The output will look like I<"me.name"> when it should actually
501 This Storage driver normally installs its own C<HandleError>, sets
502 C<RaiseError> and C<ShowErrorStatement> on, and sets C<PrintError> off on
503 all database handles, including those supplied by a coderef. It does this
504 so that it can have consistent and useful error behavior.
506 If you set this option to a true value, Storage will not do its usual
507 modifications to the database handle's attributes, and instead relies on
508 the settings in your connect_info DBI options (or the values you set in
509 your connection coderef, in the case that you are connecting via coderef).
511 Note that your custom settings can cause Storage to malfunction,
512 especially if you set a C<HandleError> handler that suppresses exceptions
513 and/or disable C<RaiseError>.
517 If this option is true, L<DBIx::Class> will use savepoints when nesting
518 transactions, making it possible to recover from failure in the inner
519 transaction without having to abort all outer transactions.
523 Use this argument to supply a cursor class other than the default
524 L<DBIx::Class::Storage::DBI::Cursor>.
528 Some real-life examples of arguments to L</connect_info> and
529 L<DBIx::Class::Schema/connect>
531 # Simple SQLite connection
532 ->connect_info([ 'dbi:SQLite:./foo.db' ]);
535 ->connect_info([ sub { DBI->connect(...) } ]);
537 # A bit more complicated
544 { quote_char => q{"}, name_sep => q{.} },
548 # Equivalent to the previous example
554 { AutoCommit => 1, quote_char => q{"}, name_sep => q{.} },
558 # Same, but with hashref as argument
559 # See parse_connect_info for explanation
562 dsn => 'dbi:Pg:dbname=foo',
564 password => 'my_pg_password',
571 # Subref + DBIx::Class-specific connection options
574 sub { DBI->connect(...) },
578 on_connect_do => ['SET search_path TO myschema,otherschema,public'],
579 disable_sth_caching => 1,
589 my ($self, $info_arg) = @_;
591 return $self->_connect_info if !$info_arg;
593 my @args = @$info_arg; # take a shallow copy for further mutilation
594 $self->_connect_info([@args]); # copy for _connect_info
597 # combine/pre-parse arguments depending on invocation style
600 if (ref $args[0] eq 'CODE') { # coderef with optional \%extra_attributes
601 %attrs = %{ $args[1] || {} };
604 elsif (ref $args[0] eq 'HASH') { # single hashref (i.e. Catalyst config)
605 %attrs = %{$args[0]};
607 for (qw/password user dsn/) {
608 unshift @args, delete $attrs{$_};
611 else { # otherwise assume dsn/user/password + \%attrs + \%extra_attrs
613 % { $args[3] || {} },
614 % { $args[4] || {} },
616 @args = @args[0,1,2];
619 # Kill sql_maker/_sql_maker_opts, so we get a fresh one with only
620 # the new set of options
621 $self->_sql_maker(undef);
622 $self->_sql_maker_opts({});
625 for my $storage_opt (@storage_options, 'cursor_class') { # @storage_options is declared at the top of the module
626 if(my $value = delete $attrs{$storage_opt}) {
627 $self->$storage_opt($value);
630 for my $sql_maker_opt (qw/limit_dialect quote_char name_sep/) {
631 if(my $opt_val = delete $attrs{$sql_maker_opt}) {
632 $self->_sql_maker_opts->{$sql_maker_opt} = $opt_val;
637 %attrs = () if (ref $args[0] eq 'CODE'); # _connect() never looks past $args[0] in this case
639 $self->_dbi_connect_info([@args, keys %attrs ? \%attrs : ()]);
640 $self->_connect_info;
645 This method is deprecated in favour of setting via L</connect_info>.
650 Arguments: ($subref | $method_name), @extra_coderef_args?
652 Execute the given $subref or $method_name using the new exception-based
653 connection management.
655 The first two arguments will be the storage object that C<dbh_do> was called
656 on and a database handle to use. Any additional arguments will be passed
657 verbatim to the called subref as arguments 2 and onwards.
659 Using this (instead of $self->_dbh or $self->dbh) ensures correct
660 exception handling and reconnection (or failover in future subclasses).
662 Your subref should have no side-effects outside of the database, as
663 there is the potential for your subref to be partially double-executed
664 if the database connection was stale/dysfunctional.
668 my @stuff = $schema->storage->dbh_do(
670 my ($storage, $dbh, @cols) = @_;
671 my $cols = join(q{, }, @cols);
672 $dbh->selectrow_array("SELECT $cols FROM foo");
683 my $dbh = $self->_dbh;
685 return $self->$code($dbh, @_) if $self->{_in_dbh_do}
686 || $self->{transaction_depth};
688 local $self->{_in_dbh_do} = 1;
691 my $want_array = wantarray;
694 $self->_verify_pid if $dbh;
696 $self->_populate_dbh;
701 @result = $self->$code($dbh, @_);
703 elsif(defined $want_array) {
704 $result[0] = $self->$code($dbh, @_);
707 $self->$code($dbh, @_);
712 if(!$exception) { return $want_array ? @result : $result[0] }
714 $self->throw_exception($exception) if $self->connected;
716 # We were not connected - reconnect and retry, but let any
717 # exception fall right through this time
718 $self->_populate_dbh;
719 $self->$code($self->_dbh, @_);
722 # This is basically a blend of dbh_do above and DBIx::Class::Storage::txn_do.
723 # It also informs dbh_do to bypass itself while under the direction of txn_do,
724 # via $self->{_in_dbh_do} (this saves some redundant eval and errorcheck, etc)
729 ref $coderef eq 'CODE' or $self->throw_exception
730 ('$coderef must be a CODE reference');
732 return $coderef->(@_) if $self->{transaction_depth} && ! $self->auto_savepoint;
734 local $self->{_in_dbh_do} = 1;
737 my $want_array = wantarray;
742 $self->_verify_pid if $self->_dbh;
743 $self->_populate_dbh if !$self->_dbh;
747 @result = $coderef->(@_);
749 elsif(defined $want_array) {
750 $result[0] = $coderef->(@_);
759 if(!$exception) { return $want_array ? @result : $result[0] }
761 if($tried++ > 0 || $self->connected) {
762 eval { $self->txn_rollback };
763 my $rollback_exception = $@;
764 if($rollback_exception) {
765 my $exception_class = "DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION";
766 $self->throw_exception($exception) # propagate nested rollback
767 if $rollback_exception =~ /$exception_class/;
769 $self->throw_exception(
770 "Transaction aborted: ${exception}. "
771 . "Rollback failed: ${rollback_exception}"
774 $self->throw_exception($exception)
777 # We were not connected, and was first try - reconnect and retry
779 $self->_populate_dbh;
785 Our C<disconnect> method also performs a rollback first if the
786 database is not in C<AutoCommit> mode.
793 if( $self->connected ) {
794 my $connection_do = $self->on_disconnect_do;
795 $self->_do_connection_actions($connection_do) if ref($connection_do);
797 $self->_dbh->rollback unless $self->_dbh_autocommit;
798 $self->_dbh->disconnect;
804 =head2 with_deferred_fk_checks
808 =item Arguments: C<$coderef>
810 =item Return Value: The return value of $coderef
814 Storage specific method to run the code ref with FK checks deferred or
815 in MySQL's case disabled entirely.
819 # Storage subclasses should override this
820 sub with_deferred_fk_checks {
821 my ($self, $sub) = @_;
829 if(my $dbh = $self->_dbh) {
830 if(defined $self->_conn_tid && $self->_conn_tid != threads->tid) {
837 return 0 if !$self->_dbh;
839 return ($dbh->FETCH('Active') && $dbh->ping);
845 # handle pid changes correctly
846 # NOTE: assumes $self->_dbh is a valid $dbh
850 return if defined $self->_conn_pid && $self->_conn_pid == $$;
852 $self->_dbh->{InactiveDestroy} = 1;
859 sub ensure_connected {
862 unless ($self->connected) {
863 $self->_populate_dbh;
869 Returns the dbh - a data base handle of class L<DBI>.
876 $self->ensure_connected;
880 sub _sql_maker_args {
883 return ( bindtype=>'columns', limit_dialect => $self->dbh, %{$self->_sql_maker_opts} );
888 unless ($self->_sql_maker) {
889 my $sql_maker_class = $self->sql_maker_class;
890 $self->_sql_maker($sql_maker_class->new( $self->_sql_maker_args ));
892 return $self->_sql_maker;
899 my @info = @{$self->_dbi_connect_info || []};
900 $self->_dbh($self->_connect(@info));
902 # Always set the transaction depth on connect, since
903 # there is no transaction in progress by definition
904 $self->{transaction_depth} = $self->_dbh_autocommit ? 0 : 1;
906 if(ref $self eq 'DBIx::Class::Storage::DBI') {
907 my $driver = $self->_dbh->{Driver}->{Name};
908 if ($self->load_optional_class("DBIx::Class::Storage::DBI::${driver}")) {
909 bless $self, "DBIx::Class::Storage::DBI::${driver}";
914 my $connection_do = $self->on_connect_do;
915 $self->_do_connection_actions($connection_do) if ref($connection_do);
917 $self->_conn_pid($$);
918 $self->_conn_tid(threads->tid) if $INC{'threads.pm'};
921 sub _do_connection_actions {
923 my $connection_do = shift;
925 if (ref $connection_do eq 'ARRAY') {
926 $self->_do_query($_) foreach @$connection_do;
928 elsif (ref $connection_do eq 'CODE') {
936 my ($self, $action) = @_;
938 if (ref $action eq 'CODE') {
939 $action = $action->($self);
940 $self->_do_query($_) foreach @$action;
943 my @to_run = (ref $action eq 'ARRAY') ? (@$action) : ($action);
944 $self->_query_start(@to_run);
945 $self->_dbh->do(@to_run);
946 $self->_query_end(@to_run);
953 my ($self, @info) = @_;
955 $self->throw_exception("You failed to provide any connection info")
958 my ($old_connect_via, $dbh);
960 if ($INC{'Apache/DBI.pm'} && $ENV{MOD_PERL}) {
961 $old_connect_via = $DBI::connect_via;
962 $DBI::connect_via = 'connect';
966 if(ref $info[0] eq 'CODE') {
970 $dbh = DBI->connect(@info);
973 if($dbh && !$self->unsafe) {
974 my $weak_self = $self;
976 $dbh->{HandleError} = sub {
978 $weak_self->throw_exception("DBI Exception: $_[0]");
981 croak ("DBI Exception: $_[0]");
984 $dbh->{ShowErrorStatement} = 1;
985 $dbh->{RaiseError} = 1;
986 $dbh->{PrintError} = 0;
990 $DBI::connect_via = $old_connect_via if $old_connect_via;
992 $self->throw_exception("DBI Connection failed: " . ($@||$DBI::errstr))
995 $self->_dbh_autocommit($dbh->{AutoCommit});
1001 my ($self, $name) = @_;
1003 $name = $self->_svp_generate_name
1004 unless defined $name;
1006 $self->throw_exception ("You can't use savepoints outside a transaction")
1007 if $self->{transaction_depth} == 0;
1009 $self->throw_exception ("Your Storage implementation doesn't support savepoints")
1010 unless $self->can('_svp_begin');
1012 push @{ $self->{savepoints} }, $name;
1014 $self->debugobj->svp_begin($name) if $self->debug;
1016 return $self->_svp_begin($name);
1020 my ($self, $name) = @_;
1022 $self->throw_exception ("You can't use savepoints outside a transaction")
1023 if $self->{transaction_depth} == 0;
1025 $self->throw_exception ("Your Storage implementation doesn't support savepoints")
1026 unless $self->can('_svp_release');
1028 if (defined $name) {
1029 $self->throw_exception ("Savepoint '$name' does not exist")
1030 unless grep { $_ eq $name } @{ $self->{savepoints} };
1032 # Dig through the stack until we find the one we are releasing. This keeps
1033 # the stack up to date.
1036 do { $svp = pop @{ $self->{savepoints} } } while $svp ne $name;
1038 $name = pop @{ $self->{savepoints} };
1041 $self->debugobj->svp_release($name) if $self->debug;
1043 return $self->_svp_release($name);
1047 my ($self, $name) = @_;
1049 $self->throw_exception ("You can't use savepoints outside a transaction")
1050 if $self->{transaction_depth} == 0;
1052 $self->throw_exception ("Your Storage implementation doesn't support savepoints")
1053 unless $self->can('_svp_rollback');
1055 if (defined $name) {
1056 # If they passed us a name, verify that it exists in the stack
1057 unless(grep({ $_ eq $name } @{ $self->{savepoints} })) {
1058 $self->throw_exception("Savepoint '$name' does not exist!");
1061 # Dig through the stack until we find the one we are releasing. This keeps
1062 # the stack up to date.
1063 while(my $s = pop(@{ $self->{savepoints} })) {
1064 last if($s eq $name);
1066 # Add the savepoint back to the stack, as a rollback doesn't remove the
1067 # named savepoint, only everything after it.
1068 push(@{ $self->{savepoints} }, $name);
1070 # We'll assume they want to rollback to the last savepoint
1071 $name = $self->{savepoints}->[-1];
1074 $self->debugobj->svp_rollback($name) if $self->debug;
1076 return $self->_svp_rollback($name);
1079 sub _svp_generate_name {
1082 return 'savepoint_'.scalar(@{ $self->{'savepoints'} });
1087 $self->ensure_connected();
1088 if($self->{transaction_depth} == 0) {
1089 $self->debugobj->txn_begin()
1091 # this isn't ->_dbh-> because
1092 # we should reconnect on begin_work
1093 # for AutoCommit users
1094 $self->dbh->begin_work;
1095 } elsif ($self->auto_savepoint) {
1098 $self->{transaction_depth}++;
1103 if ($self->{transaction_depth} == 1) {
1104 my $dbh = $self->_dbh;
1105 $self->debugobj->txn_commit()
1108 $self->{transaction_depth} = 0
1109 if $self->_dbh_autocommit;
1111 elsif($self->{transaction_depth} > 1) {
1112 $self->{transaction_depth}--;
1114 if $self->auto_savepoint;
1120 my $dbh = $self->_dbh;
1122 if ($self->{transaction_depth} == 1) {
1123 $self->debugobj->txn_rollback()
1125 $self->{transaction_depth} = 0
1126 if $self->_dbh_autocommit;
1129 elsif($self->{transaction_depth} > 1) {
1130 $self->{transaction_depth}--;
1131 if ($self->auto_savepoint) {
1132 $self->svp_rollback;
1137 die DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION->new;
1142 my $exception_class = "DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION";
1143 $error =~ /$exception_class/ and $self->throw_exception($error);
1144 # ensure that a failed rollback resets the transaction depth
1145 $self->{transaction_depth} = $self->_dbh_autocommit ? 0 : 1;
1146 $self->throw_exception($error);
1150 # This used to be the top-half of _execute. It was split out to make it
1151 # easier to override in NoBindVars without duping the rest. It takes up
1152 # all of _execute's args, and emits $sql, @bind.
1153 sub _prep_for_execute {
1154 my ($self, $op, $extra_bind, $ident, $args) = @_;
1156 my ($sql, @bind) = $self->sql_maker->$op($ident, @$args);
1158 map { ref $_ eq 'ARRAY' ? $_ : [ '!!dummy', $_ ] } @$extra_bind)
1161 return ($sql, \@bind);
1164 sub _fix_bind_params {
1165 my ($self, @bind) = @_;
1167 ### Turn @bind from something like this:
1168 ### ( [ "artist", 1 ], [ "cdid", 1, 3 ] )
1170 ### ( "'1'", "'1'", "'3'" )
1173 if ( defined( $_ && $_->[1] ) ) {
1174 map { qq{'$_'}; } @{$_}[ 1 .. $#$_ ];
1181 my ( $self, $sql, @bind ) = @_;
1183 if ( $self->debug ) {
1184 @bind = $self->_fix_bind_params(@bind);
1186 $self->debugobj->query_start( $sql, @bind );
1191 my ( $self, $sql, @bind ) = @_;
1193 if ( $self->debug ) {
1194 @bind = $self->_fix_bind_params(@bind);
1195 $self->debugobj->query_end( $sql, @bind );
1200 my ($self, $dbh, $op, $extra_bind, $ident, $bind_attributes, @args) = @_;
1202 if( blessed($ident) && $ident->isa("DBIx::Class::ResultSource") ) {
1203 $ident = $ident->from();
1206 my ($sql, $bind) = $self->_prep_for_execute($op, $extra_bind, $ident, \@args);
1208 $self->_query_start( $sql, @$bind );
1210 my $sth = $self->sth($sql,$op);
1212 my $placeholder_index = 1;
1214 foreach my $bound (@$bind) {
1215 my $attributes = {};
1216 my($column_name, @data) = @$bound;
1218 if ($bind_attributes) {
1219 $attributes = $bind_attributes->{$column_name}
1220 if defined $bind_attributes->{$column_name};
1223 foreach my $data (@data) {
1224 $data = ref $data ? ''.$data : $data; # stringify args
1226 $sth->bind_param($placeholder_index, $data, $attributes);
1227 $placeholder_index++;
1231 # Can this fail without throwing an exception anyways???
1232 my $rv = $sth->execute();
1233 $self->throw_exception($sth->errstr) if !$rv;
1235 $self->_query_end( $sql, @$bind );
1237 return (wantarray ? ($rv, $sth, @$bind) : $rv);
1242 $self->dbh_do('_dbh_execute', @_)
1246 my ($self, $source, $to_insert) = @_;
1248 my $ident = $source->from;
1249 my $bind_attributes = $self->source_bind_attributes($source);
1251 $self->ensure_connected;
1252 foreach my $col ( $source->columns ) {
1253 if ( !defined $to_insert->{$col} ) {
1254 my $col_info = $source->column_info($col);
1256 if ( $col_info->{auto_nextval} ) {
1257 $to_insert->{$col} = $self->_sequence_fetch( 'nextval', $col_info->{sequence} || $self->_dbh_get_autoinc_seq($self->dbh, $source) );
1262 $self->_execute('insert' => [], $source, $bind_attributes, $to_insert);
1267 ## Still not quite perfect, and EXPERIMENTAL
1268 ## Currently it is assumed that all values passed will be "normal", i.e. not
1269 ## scalar refs, or at least, all the same type as the first set, the statement is
1270 ## only prepped once.
1272 my ($self, $source, $cols, $data) = @_;
1274 my $table = $source->from;
1275 @colvalues{@$cols} = (0..$#$cols);
1276 my ($sql, @bind) = $self->sql_maker->insert($table, \%colvalues);
1278 $self->_query_start( $sql, @bind );
1279 my $sth = $self->sth($sql);
1281 # @bind = map { ref $_ ? ''.$_ : $_ } @bind; # stringify args
1283 ## This must be an arrayref, else nothing works!
1285 my $tuple_status = [];
1288 ##print STDERR Dumper( $data, $sql, [@bind] );
1292 ## Get the bind_attributes, if any exist
1293 my $bind_attributes = $self->source_bind_attributes($source);
1295 ## Bind the values and execute
1296 my $placeholder_index = 1;
1298 foreach my $bound (@bind) {
1300 my $attributes = {};
1301 my ($column_name, $data_index) = @$bound;
1303 if( $bind_attributes ) {
1304 $attributes = $bind_attributes->{$column_name}
1305 if defined $bind_attributes->{$column_name};
1308 my @data = map { $_->[$data_index] } @$data;
1310 $sth->bind_param_array( $placeholder_index, [@data], $attributes );
1311 $placeholder_index++;
1313 my $rv = $sth->execute_array({ArrayTupleStatus => $tuple_status});
1314 $self->throw_exception($sth->errstr) if !$rv;
1316 $self->_query_end( $sql, @bind );
1317 return (wantarray ? ($rv, $sth, @bind) : $rv);
1321 my $self = shift @_;
1322 my $source = shift @_;
1323 my $bind_attributes = $self->source_bind_attributes($source);
1325 return $self->_execute('update' => [], $source, $bind_attributes, @_);
1330 my $self = shift @_;
1331 my $source = shift @_;
1333 my $bind_attrs = {}; ## If ever it's needed...
1335 return $self->_execute('delete' => [], $source, $bind_attrs, @_);
1339 my ($self, $ident, $select, $condition, $attrs) = @_;
1340 my $order = $attrs->{order_by};
1342 if (ref $condition eq 'SCALAR') {
1343 my $unwrap = ${$condition};
1344 if ($unwrap =~ s/ORDER BY (.*)$//i) {
1346 $condition = \$unwrap;
1350 my $for = delete $attrs->{for};
1351 my $sql_maker = $self->sql_maker;
1352 local $sql_maker->{for} = $for;
1354 if (exists $attrs->{group_by} || $attrs->{having}) {
1356 group_by => $attrs->{group_by},
1357 having => $attrs->{having},
1358 ($order ? (order_by => $order) : ())
1361 my $bind_attrs = {}; ## Future support
1362 my @args = ('select', $attrs->{bind}, $ident, $bind_attrs, $select, $condition, $order);
1363 if ($attrs->{software_limit} ||
1364 $self->sql_maker->_default_limit_syntax eq "GenericSubQ") {
1365 $attrs->{software_limit} = 1;
1367 $self->throw_exception("rows attribute must be positive if present")
1368 if (defined($attrs->{rows}) && !($attrs->{rows} > 0));
1370 # MySQL actually recommends this approach. I cringe.
1371 $attrs->{rows} = 2**48 if not defined $attrs->{rows} and defined $attrs->{offset};
1372 push @args, $attrs->{rows}, $attrs->{offset};
1375 return $self->_execute(@args);
1378 sub source_bind_attributes {
1379 my ($self, $source) = @_;
1381 my $bind_attributes;
1382 foreach my $column ($source->columns) {
1384 my $data_type = $source->column_info($column)->{data_type} || '';
1385 $bind_attributes->{$column} = $self->bind_attribute_by_data_type($data_type)
1389 return $bind_attributes;
1396 =item Arguments: $ident, $select, $condition, $attrs
1400 Handle a SQL select statement.
1406 my ($ident, $select, $condition, $attrs) = @_;
1407 return $self->cursor_class->new($self, \@_, $attrs);
1412 my ($rv, $sth, @bind) = $self->_select(@_);
1413 my @row = $sth->fetchrow_array;
1414 my @nextrow = $sth->fetchrow_array if @row;
1415 if(@row && @nextrow) {
1416 carp "Query returned more than one row. SQL that returns multiple rows is DEPRECATED for ->find and ->single";
1418 # Need to call finish() to work round broken DBDs
1427 =item Arguments: $sql
1431 Returns a L<DBI> sth (statement handle) for the supplied SQL.
1436 my ($self, $dbh, $sql) = @_;
1438 # 3 is the if_active parameter which avoids active sth re-use
1439 my $sth = $self->disable_sth_caching
1440 ? $dbh->prepare($sql)
1441 : $dbh->prepare_cached($sql, {}, 3);
1443 # XXX You would think RaiseError would make this impossible,
1444 # but apparently that's not true :(
1445 $self->throw_exception($dbh->errstr) if !$sth;
1451 my ($self, $sql) = @_;
1452 $self->dbh_do('_dbh_sth', $sql);
1455 sub _dbh_columns_info_for {
1456 my ($self, $dbh, $table) = @_;
1458 if ($dbh->can('column_info')) {
1461 my ($schema,$tab) = $table =~ /^(.+?)\.(.+)$/ ? ($1,$2) : (undef,$table);
1462 my $sth = $dbh->column_info( undef,$schema, $tab, '%' );
1464 while ( my $info = $sth->fetchrow_hashref() ){
1466 $column_info{data_type} = $info->{TYPE_NAME};
1467 $column_info{size} = $info->{COLUMN_SIZE};
1468 $column_info{is_nullable} = $info->{NULLABLE} ? 1 : 0;
1469 $column_info{default_value} = $info->{COLUMN_DEF};
1470 my $col_name = $info->{COLUMN_NAME};
1471 $col_name =~ s/^\"(.*)\"$/$1/;
1473 $result{$col_name} = \%column_info;
1476 return \%result if !$@ && scalar keys %result;
1480 my $sth = $dbh->prepare($self->sql_maker->select($table, undef, \'1 = 0'));
1482 my @columns = @{$sth->{NAME_lc}};
1483 for my $i ( 0 .. $#columns ){
1485 $column_info{data_type} = $sth->{TYPE}->[$i];
1486 $column_info{size} = $sth->{PRECISION}->[$i];
1487 $column_info{is_nullable} = $sth->{NULLABLE}->[$i] ? 1 : 0;
1489 if ($column_info{data_type} =~ m/^(.*?)\((.*?)\)$/) {
1490 $column_info{data_type} = $1;
1491 $column_info{size} = $2;
1494 $result{$columns[$i]} = \%column_info;
1498 foreach my $col (keys %result) {
1499 my $colinfo = $result{$col};
1500 my $type_num = $colinfo->{data_type};
1502 if(defined $type_num && $dbh->can('type_info')) {
1503 my $type_info = $dbh->type_info($type_num);
1504 $type_name = $type_info->{TYPE_NAME} if $type_info;
1505 $colinfo->{data_type} = $type_name if $type_name;
1512 sub columns_info_for {
1513 my ($self, $table) = @_;
1514 $self->dbh_do('_dbh_columns_info_for', $table);
1517 =head2 last_insert_id
1519 Return the row id of the last insert.
1523 sub _dbh_last_insert_id {
1524 my ($self, $dbh, $source, $col) = @_;
1525 # XXX This is a SQLite-ism as a default... is there a DBI-generic way?
1526 $dbh->func('last_insert_rowid');
1529 sub last_insert_id {
1531 $self->dbh_do('_dbh_last_insert_id', @_);
1536 Returns the database driver name.
1540 sub sqlt_type { shift->dbh->{Driver}->{Name} }
1542 =head2 bind_attribute_by_data_type
1544 Given a datatype from column info, returns a database specific bind
1545 attribute for C<< $dbh->bind_param($val,$attribute) >> or nothing if we will
1546 let the database planner just handle it.
1548 Generally only needed for special case column types, like bytea in postgres.
1552 sub bind_attribute_by_data_type {
1556 =head2 create_ddl_dir
1560 =item Arguments: $schema \@databases, $version, $directory, $preversion, \%sqlt_args
1564 Creates a SQL file based on the Schema, for each of the specified
1565 database types, in the given directory.
1567 By default, C<\%sqlt_args> will have
1569 { add_drop_table => 1, ignore_constraint_names => 1, ignore_index_names => 1 }
1571 merged with the hash passed in. To disable any of those features, pass in a
1572 hashref like the following
1574 { ignore_constraint_names => 0, # ... other options }
1578 sub create_ddl_dir {
1579 my ($self, $schema, $databases, $version, $dir, $preversion, $sqltargs) = @_;
1581 if(!$dir || !-d $dir) {
1582 warn "No directory given, using ./\n";
1585 $databases ||= ['MySQL', 'SQLite', 'PostgreSQL'];
1586 $databases = [ $databases ] if(ref($databases) ne 'ARRAY');
1588 my $schema_version = $schema->schema_version || '1.x';
1589 $version ||= $schema_version;
1592 add_drop_table => 1,
1593 ignore_constraint_names => 1,
1594 ignore_index_names => 1,
1598 $self->throw_exception(q{Can't create a ddl file without SQL::Translator 0.09: '}
1599 . $self->_check_sqlt_message . q{'})
1600 if !$self->_check_sqlt_version;
1602 my $sqlt = SQL::Translator->new( $sqltargs );
1604 $sqlt->parser('SQL::Translator::Parser::DBIx::Class');
1605 my $sqlt_schema = $sqlt->translate({ data => $schema }) or die $sqlt->error;
1607 foreach my $db (@$databases) {
1609 $sqlt = $self->configure_sqlt($sqlt, $db);
1610 $sqlt->{schema} = $sqlt_schema;
1611 $sqlt->producer($db);
1614 my $filename = $schema->ddl_filename($db, $version, $dir);
1615 if (-e $filename && ($version eq $schema_version )) {
1616 # if we are dumping the current version, overwrite the DDL
1617 warn "Overwriting existing DDL file - $filename";
1621 my $output = $sqlt->translate;
1623 warn("Failed to translate to $db, skipping. (" . $sqlt->error . ")");
1626 if(!open($file, ">$filename")) {
1627 $self->throw_exception("Can't open $filename for writing ($!)");
1630 print $file $output;
1633 next unless ($preversion);
1635 require SQL::Translator::Diff;
1637 my $prefilename = $schema->ddl_filename($db, $preversion, $dir);
1638 if(!-e $prefilename) {
1639 warn("No previous schema file found ($prefilename)");
1643 my $difffile = $schema->ddl_filename($db, $version, $dir, $preversion);
1645 warn("Overwriting existing diff file - $difffile");
1651 my $t = SQL::Translator->new($sqltargs);
1654 $t->parser( $db ) or die $t->error;
1655 $t = $self->configure_sqlt($t, $db);
1656 my $out = $t->translate( $prefilename ) or die $t->error;
1657 $source_schema = $t->schema;
1658 unless ( $source_schema->name ) {
1659 $source_schema->name( $prefilename );
1663 # The "new" style of producers have sane normalization and can support
1664 # diffing a SQL file against a DBIC->SQLT schema. Old style ones don't
1665 # And we have to diff parsed SQL against parsed SQL.
1666 my $dest_schema = $sqlt_schema;
1668 unless ( "SQL::Translator::Producer::$db"->can('preprocess_schema') ) {
1669 my $t = SQL::Translator->new($sqltargs);
1672 $t->parser( $db ) or die $t->error;
1673 $t = $self->configure_sqlt($t, $db);
1674 my $out = $t->translate( $filename ) or die $t->error;
1675 $dest_schema = $t->schema;
1676 $dest_schema->name( $filename )
1677 unless $dest_schema->name;
1680 my $diff = SQL::Translator::Diff::schema_diff($source_schema, $db,
1684 if(!open $file, ">$difffile") {
1685 $self->throw_exception("Can't write to $difffile ($!)");
1693 sub configure_sqlt() {
1696 my $db = shift || $self->sqlt_type;
1697 if ($db eq 'PostgreSQL') {
1698 $tr->quote_table_names(0);
1699 $tr->quote_field_names(0);
1704 =head2 deployment_statements
1708 =item Arguments: $schema, $type, $version, $directory, $sqlt_args
1712 Returns the statements used by L</deploy> and L<DBIx::Class::Schema/deploy>.
1713 The database driver name is given by C<$type>, though the value from
1714 L</sqlt_type> is used if it is not specified.
1716 C<$directory> is used to return statements from files in a previously created
1717 L</create_ddl_dir> directory and is optional. The filenames are constructed
1718 from L<DBIx::Class::Schema/ddl_filename>, the schema name and the C<$version>.
1720 If no C<$directory> is specified then the statements are constructed on the
1721 fly using L<SQL::Translator> and C<$version> is ignored.
1723 See L<SQL::Translator/METHODS> for a list of values for C<$sqlt_args>.
1727 sub deployment_statements {
1728 my ($self, $schema, $type, $version, $dir, $sqltargs) = @_;
1729 # Need to be connected to get the correct sqlt_type
1730 $self->ensure_connected() unless $type;
1731 $type ||= $self->sqlt_type;
1732 $version ||= $schema->schema_version || '1.x';
1734 my $filename = $schema->ddl_filename($type, $dir, $version);
1738 open($file, "<$filename")
1739 or $self->throw_exception("Can't open $filename ($!)");
1742 return join('', @rows);
1745 $self->throw_exception(q{Can't deploy without SQL::Translator 0.09: '}
1746 . $self->_check_sqlt_message . q{'})
1747 if !$self->_check_sqlt_version;
1749 require SQL::Translator::Parser::DBIx::Class;
1750 eval qq{use SQL::Translator::Producer::${type}};
1751 $self->throw_exception($@) if $@;
1753 # sources needs to be a parser arg, but for simplicty allow at top level
1755 $sqltargs->{parser_args}{sources} = delete $sqltargs->{sources}
1756 if exists $sqltargs->{sources};
1758 my $tr = SQL::Translator->new(%$sqltargs);
1759 SQL::Translator::Parser::DBIx::Class::parse( $tr, $schema );
1760 return "SQL::Translator::Producer::${type}"->can('produce')->($tr);
1764 my ($self, $schema, $type, $sqltargs, $dir) = @_;
1765 foreach my $statement ( $self->deployment_statements($schema, $type, undef, $dir, { no_comments => 1, %{ $sqltargs || {} } } ) ) {
1766 foreach my $line ( split(";\n", $statement)) {
1767 next if($line =~ /^--/);
1769 # next if($line =~ /^DROP/m);
1770 next if($line =~ /^BEGIN TRANSACTION/m);
1771 next if($line =~ /^COMMIT/m);
1772 next if $line =~ /^\s+$/; # skip whitespace only
1773 $self->_query_start($line);
1775 $self->dbh->do($line); # shouldn't be using ->dbh ?
1778 warn qq{$@ (running "${line}")};
1780 $self->_query_end($line);
1785 =head2 datetime_parser
1787 Returns the datetime parser class
1791 sub datetime_parser {
1793 return $self->{datetime_parser} ||= do {
1794 $self->ensure_connected;
1795 $self->build_datetime_parser(@_);
1799 =head2 datetime_parser_type
1801 Defines (returns) the datetime parser class - currently hardwired to
1802 L<DateTime::Format::MySQL>
1806 sub datetime_parser_type { "DateTime::Format::MySQL"; }
1808 =head2 build_datetime_parser
1810 See L</datetime_parser>
1814 sub build_datetime_parser {
1816 my $type = $self->datetime_parser_type(@_);
1818 $self->throw_exception("Couldn't load ${type}: $@") if $@;
1823 my $_check_sqlt_version; # private
1824 my $_check_sqlt_message; # private
1825 sub _check_sqlt_version {
1826 return $_check_sqlt_version if defined $_check_sqlt_version;
1827 eval 'use SQL::Translator "0.09"';
1828 $_check_sqlt_message = $@ || '';
1829 $_check_sqlt_version = !$@;
1832 sub _check_sqlt_message {
1833 _check_sqlt_version if !defined $_check_sqlt_message;
1834 $_check_sqlt_message;
1838 =head2 is_replicating
1840 A boolean that reports if a particular L<DBIx::Class::Storage::DBI> is set to
1841 replicate from a master database. Default is undef, which is the result
1842 returned by databases that don't support replication.
1846 sub is_replicating {
1851 =head2 lag_behind_master
1853 Returns a number that represents a certain amount of lag behind a master db
1854 when a given storage is replicating. The number is database dependent, but
1855 starts at zero and increases with the amount of lag. Default in undef
1859 sub lag_behind_master {
1865 return if !$self->_dbh;
1874 =head2 DBIx::Class and AutoCommit
1876 DBIx::Class can do some wonderful magic with handling exceptions,
1877 disconnections, and transactions when you use C<< AutoCommit => 1 >>
1878 combined with C<txn_do> for transaction support.
1880 If you set C<< AutoCommit => 0 >> in your connect info, then you are always
1881 in an assumed transaction between commits, and you're telling us you'd
1882 like to manage that manually. A lot of the magic protections offered by
1883 this module will go away. We can't protect you from exceptions due to database
1884 disconnects because we don't know anything about how to restart your
1885 transactions. You're on your own for handling all sorts of exceptional
1886 cases if you choose the C<< AutoCommit => 0 >> path, just as you would
1892 The module defines a set of methods within the DBIC::SQL::Abstract
1893 namespace. These build on L<SQL::Abstract::Limit> to provide the
1894 SQL query functions.
1896 The following methods are extended:-
1910 See L</connect_info> for details.
1914 See L</connect_info> for details.
1918 See L</connect_info> for details.
1924 Matt S. Trout <mst@shadowcatsystems.co.uk>
1926 Andy Grundman <andy@hybridized.org>
1930 You may distribute this code under the same terms as Perl itself.