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 DBIx::Class::Storage::DBI::Cursor;
11 use DBIx::Class::Storage::Statistics;
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('DBIx::Class::SQLAHacks');
37 DBIx::Class::Storage::DBI - DBI storage handler
41 my $schema = MySchema->connect('dbi:SQLite:my.db');
43 $schema->storage->debug(1);
44 $schema->dbh_do("DROP TABLE authors");
46 $schema->resultset('Book')->search({
47 written_on => $schema->storage->datetime_parser(DateTime->now)
52 This class represents the connection to an RDBMS via L<DBI>. See
53 L<DBIx::Class::Storage> for general information. This pod only
54 documents DBI-specific methods and behaviors.
61 my $new = shift->next::method(@_);
63 $new->transaction_depth(0);
64 $new->_sql_maker_opts({});
65 $new->{savepoints} = [];
66 $new->{_in_dbh_do} = 0;
74 This method is normally called by L<DBIx::Class::Schema/connection>, which
75 encapsulates its argument list in an arrayref before passing them here.
77 The argument list may contain:
83 The same 4-element argument set one would normally pass to
84 L<DBI/connect>, optionally followed by
85 L<extra attributes|/DBIx::Class specific connection attributes>
86 recognized by DBIx::Class:
88 $connect_info_args = [ $dsn, $user, $password, \%dbi_attributes?, \%extra_attributes? ];
92 A single code reference which returns a connected
93 L<DBI database handle|DBI/connect> optionally followed by
94 L<extra attributes|/DBIx::Class specific connection attributes> recognized
97 $connect_info_args = [ sub { DBI->connect (...) }, \%extra_attributes? ];
101 A single hashref with all the attributes and the dsn/user/password
104 $connect_info_args = [{
112 This is particularly useful for L<Catalyst> based applications, allowing the
113 following config (L<Config::General> style):
118 dsn dbi:mysql:database=test
127 Please note that the L<DBI> docs recommend that you always explicitly
128 set C<AutoCommit> to either I<0> or I<1>. L<DBIx::Class> further
129 recommends that it be set to I<1>, and that you perform transactions
130 via our L<DBIx::Class::Schema/txn_do> method. L<DBIx::Class> will set it
131 to I<1> if you do not do explicitly set it to zero. This is the default
132 for most DBDs. See L</DBIx::Class and AutoCommit> for details.
134 =head3 DBIx::Class specific connection attributes
136 In addition to the standard L<DBI|DBI/ATTRIBUTES_COMMON_TO_ALL_HANDLES>
137 L<connection|DBI/Database_Handle_Attributes> attributes, DBIx::Class recognizes
138 the following connection options. These options can be mixed in with your other
139 L<DBI> connection attributes, or placed in a seperate hashref
140 (C<\%extra_attributes>) as shown above.
142 Every time C<connect_info> is invoked, any previous settings for
143 these options will be cleared before setting the new ones, regardless of
144 whether any options are specified in the new C<connect_info>.
151 Specifies things to do immediately after connecting or re-connecting to
152 the database. Its value may contain:
158 This contains one SQL statement to execute.
160 =item an array reference
162 This contains SQL statements to execute in order. Each element contains
163 a string or a code reference that returns a string.
165 =item a code reference
167 This contains some code to execute. Unlike code references within an
168 array reference, its return value is ignored.
172 =item on_disconnect_do
174 Takes arguments in the same form as L</on_connect_do> and executes them
175 immediately before disconnecting from the database.
177 Note, this only runs if you explicitly call L</disconnect> on the
180 =item disable_sth_caching
182 If set to a true value, this option will disable the caching of
183 statement handles via L<DBI/prepare_cached>.
187 Sets the limit dialect. This is useful for JDBC-bridge among others
188 where the remote SQL-dialect cannot be determined by the name of the
189 driver alone. See also L<SQL::Abstract::Limit>.
193 Specifies what characters to use to quote table and column names. If
194 you use this you will want to specify L</name_sep> as well.
196 C<quote_char> expects either a single character, in which case is it
197 is placed on either side of the table/column name, or an arrayref of length
198 2 in which case the table/column name is placed between the elements.
200 For example under MySQL you should use C<< quote_char => '`' >>, and for
201 SQL Server you should use C<< quote_char => [qw/[ ]/] >>.
205 This only needs to be used in conjunction with C<quote_char>, and is used to
206 specify the charecter that seperates elements (schemas, tables, columns) from
207 each other. In most cases this is simply a C<.>.
209 The consequences of not supplying this value is that L<SQL::Abstract>
210 will assume DBIx::Class' uses of aliases to be complete column
211 names. The output will look like I<"me.name"> when it should actually
216 This Storage driver normally installs its own C<HandleError>, sets
217 C<RaiseError> and C<ShowErrorStatement> on, and sets C<PrintError> off on
218 all database handles, including those supplied by a coderef. It does this
219 so that it can have consistent and useful error behavior.
221 If you set this option to a true value, Storage will not do its usual
222 modifications to the database handle's attributes, and instead relies on
223 the settings in your connect_info DBI options (or the values you set in
224 your connection coderef, in the case that you are connecting via coderef).
226 Note that your custom settings can cause Storage to malfunction,
227 especially if you set a C<HandleError> handler that suppresses exceptions
228 and/or disable C<RaiseError>.
232 If this option is true, L<DBIx::Class> will use savepoints when nesting
233 transactions, making it possible to recover from failure in the inner
234 transaction without having to abort all outer transactions.
238 Use this argument to supply a cursor class other than the default
239 L<DBIx::Class::Storage::DBI::Cursor>.
243 Some real-life examples of arguments to L</connect_info> and
244 L<DBIx::Class::Schema/connect>
246 # Simple SQLite connection
247 ->connect_info([ 'dbi:SQLite:./foo.db' ]);
250 ->connect_info([ sub { DBI->connect(...) } ]);
252 # A bit more complicated
259 { quote_char => q{"}, name_sep => q{.} },
263 # Equivalent to the previous example
269 { AutoCommit => 1, quote_char => q{"}, name_sep => q{.} },
273 # Same, but with hashref as argument
274 # See parse_connect_info for explanation
277 dsn => 'dbi:Pg:dbname=foo',
279 password => 'my_pg_password',
286 # Subref + DBIx::Class-specific connection options
289 sub { DBI->connect(...) },
293 on_connect_do => ['SET search_path TO myschema,otherschema,public'],
294 disable_sth_caching => 1,
304 my ($self, $info_arg) = @_;
306 return $self->_connect_info if !$info_arg;
308 my @args = @$info_arg; # take a shallow copy for further mutilation
309 $self->_connect_info([@args]); # copy for _connect_info
312 # combine/pre-parse arguments depending on invocation style
315 if (ref $args[0] eq 'CODE') { # coderef with optional \%extra_attributes
316 %attrs = %{ $args[1] || {} };
319 elsif (ref $args[0] eq 'HASH') { # single hashref (i.e. Catalyst config)
320 %attrs = %{$args[0]};
322 for (qw/password user dsn/) {
323 unshift @args, delete $attrs{$_};
326 else { # otherwise assume dsn/user/password + \%attrs + \%extra_attrs
328 % { $args[3] || {} },
329 % { $args[4] || {} },
331 @args = @args[0,1,2];
334 # Kill sql_maker/_sql_maker_opts, so we get a fresh one with only
335 # the new set of options
336 $self->_sql_maker(undef);
337 $self->_sql_maker_opts({});
340 for my $storage_opt (@storage_options, 'cursor_class') { # @storage_options is declared at the top of the module
341 if(my $value = delete $attrs{$storage_opt}) {
342 $self->$storage_opt($value);
345 for my $sql_maker_opt (qw/limit_dialect quote_char name_sep/) {
346 if(my $opt_val = delete $attrs{$sql_maker_opt}) {
347 $self->_sql_maker_opts->{$sql_maker_opt} = $opt_val;
352 %attrs = () if (ref $args[0] eq 'CODE'); # _connect() never looks past $args[0] in this case
354 $self->_dbi_connect_info([@args, keys %attrs ? \%attrs : ()]);
355 $self->_connect_info;
360 This method is deprecated in favour of setting via L</connect_info>.
365 Arguments: ($subref | $method_name), @extra_coderef_args?
367 Execute the given $subref or $method_name using the new exception-based
368 connection management.
370 The first two arguments will be the storage object that C<dbh_do> was called
371 on and a database handle to use. Any additional arguments will be passed
372 verbatim to the called subref as arguments 2 and onwards.
374 Using this (instead of $self->_dbh or $self->dbh) ensures correct
375 exception handling and reconnection (or failover in future subclasses).
377 Your subref should have no side-effects outside of the database, as
378 there is the potential for your subref to be partially double-executed
379 if the database connection was stale/dysfunctional.
383 my @stuff = $schema->storage->dbh_do(
385 my ($storage, $dbh, @cols) = @_;
386 my $cols = join(q{, }, @cols);
387 $dbh->selectrow_array("SELECT $cols FROM foo");
398 my $dbh = $self->_dbh;
400 return $self->$code($dbh, @_) if $self->{_in_dbh_do}
401 || $self->{transaction_depth};
403 local $self->{_in_dbh_do} = 1;
406 my $want_array = wantarray;
409 $self->_verify_pid if $dbh;
411 $self->_populate_dbh;
416 @result = $self->$code($dbh, @_);
418 elsif(defined $want_array) {
419 $result[0] = $self->$code($dbh, @_);
422 $self->$code($dbh, @_);
427 if(!$exception) { return $want_array ? @result : $result[0] }
429 $self->throw_exception($exception) if $self->connected;
431 # We were not connected - reconnect and retry, but let any
432 # exception fall right through this time
433 $self->_populate_dbh;
434 $self->$code($self->_dbh, @_);
437 # This is basically a blend of dbh_do above and DBIx::Class::Storage::txn_do.
438 # It also informs dbh_do to bypass itself while under the direction of txn_do,
439 # via $self->{_in_dbh_do} (this saves some redundant eval and errorcheck, etc)
444 ref $coderef eq 'CODE' or $self->throw_exception
445 ('$coderef must be a CODE reference');
447 return $coderef->(@_) if $self->{transaction_depth} && ! $self->auto_savepoint;
449 local $self->{_in_dbh_do} = 1;
452 my $want_array = wantarray;
457 $self->_verify_pid if $self->_dbh;
458 $self->_populate_dbh if !$self->_dbh;
462 @result = $coderef->(@_);
464 elsif(defined $want_array) {
465 $result[0] = $coderef->(@_);
474 if(!$exception) { return $want_array ? @result : $result[0] }
476 if($tried++ > 0 || $self->connected) {
477 eval { $self->txn_rollback };
478 my $rollback_exception = $@;
479 if($rollback_exception) {
480 my $exception_class = "DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION";
481 $self->throw_exception($exception) # propagate nested rollback
482 if $rollback_exception =~ /$exception_class/;
484 $self->throw_exception(
485 "Transaction aborted: ${exception}. "
486 . "Rollback failed: ${rollback_exception}"
489 $self->throw_exception($exception)
492 # We were not connected, and was first try - reconnect and retry
494 $self->_populate_dbh;
500 Our C<disconnect> method also performs a rollback first if the
501 database is not in C<AutoCommit> mode.
508 if( $self->connected ) {
509 my $connection_do = $self->on_disconnect_do;
510 $self->_do_connection_actions($connection_do) if ref($connection_do);
512 $self->_dbh->rollback unless $self->_dbh_autocommit;
513 $self->_dbh->disconnect;
519 =head2 with_deferred_fk_checks
523 =item Arguments: C<$coderef>
525 =item Return Value: The return value of $coderef
529 Storage specific method to run the code ref with FK checks deferred or
530 in MySQL's case disabled entirely.
534 # Storage subclasses should override this
535 sub with_deferred_fk_checks {
536 my ($self, $sub) = @_;
544 if(my $dbh = $self->_dbh) {
545 if(defined $self->_conn_tid && $self->_conn_tid != threads->tid) {
552 return 0 if !$self->_dbh;
554 return ($dbh->FETCH('Active') && $dbh->ping);
560 # handle pid changes correctly
561 # NOTE: assumes $self->_dbh is a valid $dbh
565 return if defined $self->_conn_pid && $self->_conn_pid == $$;
567 $self->_dbh->{InactiveDestroy} = 1;
574 sub ensure_connected {
577 unless ($self->connected) {
578 $self->_populate_dbh;
584 Returns the dbh - a data base handle of class L<DBI>.
591 $self->ensure_connected;
595 sub _sql_maker_args {
598 return ( bindtype=>'columns', array_datatypes => 1, limit_dialect => $self->dbh, %{$self->_sql_maker_opts} );
603 unless ($self->_sql_maker) {
604 my $sql_maker_class = $self->sql_maker_class;
605 $self->ensure_class_loaded ($sql_maker_class);
606 $self->_sql_maker($sql_maker_class->new( $self->_sql_maker_args ));
608 return $self->_sql_maker;
615 my @info = @{$self->_dbi_connect_info || []};
616 $self->_dbh($self->_connect(@info));
618 $self->_conn_pid($$);
619 $self->_conn_tid(threads->tid) if $INC{'threads.pm'};
621 $self->_determine_driver;
623 # Always set the transaction depth on connect, since
624 # there is no transaction in progress by definition
625 $self->{transaction_depth} = $self->_dbh_autocommit ? 0 : 1;
627 my $connection_do = $self->on_connect_do;
628 $self->_do_connection_actions($connection_do) if $connection_do;
631 sub _determine_driver {
634 if (ref $self eq 'DBIx::Class::Storage::DBI') {
637 if ($self->_dbh) { # we are connected
638 $driver = $self->_dbh->{Driver}{Name};
640 # try to use dsn to not require being connected, the driver may still
641 # force a connection in _rebless to determine version
642 ($driver) = $self->_dbi_connect_info->[0] =~ /dbi:([^:]+):/i;
645 if ($self->load_optional_class("DBIx::Class::Storage::DBI::${driver}")) {
646 bless $self, "DBIx::Class::Storage::DBI::${driver}";
652 sub _do_connection_actions {
654 my $connection_do = shift;
656 if (!ref $connection_do) {
657 $self->_do_query($connection_do);
659 elsif (ref $connection_do eq 'ARRAY') {
660 $self->_do_query($_) foreach @$connection_do;
662 elsif (ref $connection_do eq 'CODE') {
663 $connection_do->($self);
666 $self->throw_exception (sprintf ("Don't know how to process conection actions of type '%s'", ref $connection_do) );
673 my ($self, $action) = @_;
675 if (ref $action eq 'CODE') {
676 $action = $action->($self);
677 $self->_do_query($_) foreach @$action;
680 # Most debuggers expect ($sql, @bind), so we need to exclude
681 # the attribute hash which is the second argument to $dbh->do
682 # furthermore the bind values are usually to be presented
683 # as named arrayref pairs, so wrap those here too
684 my @do_args = (ref $action eq 'ARRAY') ? (@$action) : ($action);
685 my $sql = shift @do_args;
686 my $attrs = shift @do_args;
687 my @bind = map { [ undef, $_ ] } @do_args;
689 $self->_query_start($sql, @bind);
690 $self->_dbh->do($sql, $attrs, @do_args);
691 $self->_query_end($sql, @bind);
698 my ($self, @info) = @_;
700 $self->throw_exception("You failed to provide any connection info")
703 my ($old_connect_via, $dbh);
705 if ($INC{'Apache/DBI.pm'} && $ENV{MOD_PERL}) {
706 $old_connect_via = $DBI::connect_via;
707 $DBI::connect_via = 'connect';
711 if(ref $info[0] eq 'CODE') {
715 $dbh = DBI->connect(@info);
718 if($dbh && !$self->unsafe) {
719 my $weak_self = $self;
720 Scalar::Util::weaken($weak_self);
721 $dbh->{HandleError} = sub {
723 $weak_self->throw_exception("DBI Exception: $_[0]");
726 croak ("DBI Exception: $_[0]");
729 $dbh->{ShowErrorStatement} = 1;
730 $dbh->{RaiseError} = 1;
731 $dbh->{PrintError} = 0;
735 $DBI::connect_via = $old_connect_via if $old_connect_via;
737 $self->throw_exception("DBI Connection failed: " . ($@||$DBI::errstr))
740 $self->_dbh_autocommit($dbh->{AutoCommit});
746 my ($self, $name) = @_;
748 $name = $self->_svp_generate_name
749 unless defined $name;
751 $self->throw_exception ("You can't use savepoints outside a transaction")
752 if $self->{transaction_depth} == 0;
754 $self->throw_exception ("Your Storage implementation doesn't support savepoints")
755 unless $self->can('_svp_begin');
757 push @{ $self->{savepoints} }, $name;
759 $self->debugobj->svp_begin($name) if $self->debug;
761 return $self->_svp_begin($name);
765 my ($self, $name) = @_;
767 $self->throw_exception ("You can't use savepoints outside a transaction")
768 if $self->{transaction_depth} == 0;
770 $self->throw_exception ("Your Storage implementation doesn't support savepoints")
771 unless $self->can('_svp_release');
774 $self->throw_exception ("Savepoint '$name' does not exist")
775 unless grep { $_ eq $name } @{ $self->{savepoints} };
777 # Dig through the stack until we find the one we are releasing. This keeps
778 # the stack up to date.
781 do { $svp = pop @{ $self->{savepoints} } } while $svp ne $name;
783 $name = pop @{ $self->{savepoints} };
786 $self->debugobj->svp_release($name) if $self->debug;
788 return $self->_svp_release($name);
792 my ($self, $name) = @_;
794 $self->throw_exception ("You can't use savepoints outside a transaction")
795 if $self->{transaction_depth} == 0;
797 $self->throw_exception ("Your Storage implementation doesn't support savepoints")
798 unless $self->can('_svp_rollback');
801 # If they passed us a name, verify that it exists in the stack
802 unless(grep({ $_ eq $name } @{ $self->{savepoints} })) {
803 $self->throw_exception("Savepoint '$name' does not exist!");
806 # Dig through the stack until we find the one we are releasing. This keeps
807 # the stack up to date.
808 while(my $s = pop(@{ $self->{savepoints} })) {
809 last if($s eq $name);
811 # Add the savepoint back to the stack, as a rollback doesn't remove the
812 # named savepoint, only everything after it.
813 push(@{ $self->{savepoints} }, $name);
815 # We'll assume they want to rollback to the last savepoint
816 $name = $self->{savepoints}->[-1];
819 $self->debugobj->svp_rollback($name) if $self->debug;
821 return $self->_svp_rollback($name);
824 sub _svp_generate_name {
827 return 'savepoint_'.scalar(@{ $self->{'savepoints'} });
832 $self->ensure_connected();
833 if($self->{transaction_depth} == 0) {
834 $self->debugobj->txn_begin()
836 # this isn't ->_dbh-> because
837 # we should reconnect on begin_work
838 # for AutoCommit users
839 $self->dbh->begin_work;
840 } elsif ($self->auto_savepoint) {
843 $self->{transaction_depth}++;
848 if ($self->{transaction_depth} == 1) {
849 my $dbh = $self->_dbh;
850 $self->debugobj->txn_commit()
853 $self->{transaction_depth} = 0
854 if $self->_dbh_autocommit;
856 elsif($self->{transaction_depth} > 1) {
857 $self->{transaction_depth}--;
859 if $self->auto_savepoint;
865 my $dbh = $self->_dbh;
867 if ($self->{transaction_depth} == 1) {
868 $self->debugobj->txn_rollback()
870 $self->{transaction_depth} = 0
871 if $self->_dbh_autocommit;
874 elsif($self->{transaction_depth} > 1) {
875 $self->{transaction_depth}--;
876 if ($self->auto_savepoint) {
882 die DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION->new;
887 my $exception_class = "DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION";
888 $error =~ /$exception_class/ and $self->throw_exception($error);
889 # ensure that a failed rollback resets the transaction depth
890 $self->{transaction_depth} = $self->_dbh_autocommit ? 0 : 1;
891 $self->throw_exception($error);
895 # This used to be the top-half of _execute. It was split out to make it
896 # easier to override in NoBindVars without duping the rest. It takes up
897 # all of _execute's args, and emits $sql, @bind.
898 sub _prep_for_execute {
899 my ($self, $op, $extra_bind, $ident, $args) = @_;
901 if( Scalar::Util::blessed($ident) && $ident->isa("DBIx::Class::ResultSource") ) {
902 $ident = $ident->from();
905 my ($sql, @bind) = $self->sql_maker->$op($ident, @$args);
908 map { ref $_ eq 'ARRAY' ? $_ : [ '!!dummy', $_ ] } @$extra_bind)
910 return ($sql, \@bind);
914 sub _fix_bind_params {
915 my ($self, @bind) = @_;
917 ### Turn @bind from something like this:
918 ### ( [ "artist", 1 ], [ "cdid", 1, 3 ] )
920 ### ( "'1'", "'1'", "'3'" )
923 if ( defined( $_ && $_->[1] ) ) {
924 map { qq{'$_'}; } @{$_}[ 1 .. $#$_ ];
931 my ( $self, $sql, @bind ) = @_;
933 if ( $self->debug ) {
934 @bind = $self->_fix_bind_params(@bind);
936 $self->debugobj->query_start( $sql, @bind );
941 my ( $self, $sql, @bind ) = @_;
943 if ( $self->debug ) {
944 @bind = $self->_fix_bind_params(@bind);
945 $self->debugobj->query_end( $sql, @bind );
950 my ($self, $dbh, $op, $extra_bind, $ident, $bind_attributes, @args) = @_;
952 my ($sql, $bind) = $self->_prep_for_execute($op, $extra_bind, $ident, \@args);
954 $self->_query_start( $sql, @$bind );
956 my $sth = $self->sth($sql,$op);
958 my $placeholder_index = 1;
960 foreach my $bound (@$bind) {
962 my($column_name, @data) = @$bound;
964 if ($bind_attributes) {
965 $attributes = $bind_attributes->{$column_name}
966 if defined $bind_attributes->{$column_name};
969 foreach my $data (@data) {
971 $data = $ref && $ref ne 'ARRAY' ? ''.$data : $data; # stringify args (except arrayrefs)
973 $sth->bind_param($placeholder_index, $data, $attributes);
974 $placeholder_index++;
978 # Can this fail without throwing an exception anyways???
979 my $rv = $sth->execute();
980 $self->throw_exception($sth->errstr) if !$rv;
982 $self->_query_end( $sql, @$bind );
984 return (wantarray ? ($rv, $sth, @$bind) : $rv);
989 $self->dbh_do('_dbh_execute', @_)
993 my ($self, $source, $to_insert) = @_;
995 my $ident = $source->from;
996 my $bind_attributes = $self->source_bind_attributes($source);
998 my $updated_cols = {};
1000 $self->ensure_connected;
1001 foreach my $col ( $source->columns ) {
1002 if ( !defined $to_insert->{$col} ) {
1003 my $col_info = $source->column_info($col);
1005 if ( $col_info->{auto_nextval} ) {
1006 $updated_cols->{$col} = $to_insert->{$col} = $self->_sequence_fetch( 'nextval', $col_info->{sequence} || $self->_dbh_get_autoinc_seq($self->dbh, $source) );
1011 $self->_execute('insert' => [], $source, $bind_attributes, $to_insert);
1013 return $updated_cols;
1016 ## Still not quite perfect, and EXPERIMENTAL
1017 ## Currently it is assumed that all values passed will be "normal", i.e. not
1018 ## scalar refs, or at least, all the same type as the first set, the statement is
1019 ## only prepped once.
1021 my ($self, $source, $cols, $data) = @_;
1023 my $table = $source->from;
1024 @colvalues{@$cols} = (0..$#$cols);
1025 my ($sql, @bind) = $self->sql_maker->insert($table, \%colvalues);
1027 $self->_query_start( $sql, @bind );
1028 my $sth = $self->sth($sql);
1030 # @bind = map { ref $_ ? ''.$_ : $_ } @bind; # stringify args
1032 ## This must be an arrayref, else nothing works!
1033 my $tuple_status = [];
1035 ## Get the bind_attributes, if any exist
1036 my $bind_attributes = $self->source_bind_attributes($source);
1038 ## Bind the values and execute
1039 my $placeholder_index = 1;
1041 foreach my $bound (@bind) {
1043 my $attributes = {};
1044 my ($column_name, $data_index) = @$bound;
1046 if( $bind_attributes ) {
1047 $attributes = $bind_attributes->{$column_name}
1048 if defined $bind_attributes->{$column_name};
1051 my @data = map { $_->[$data_index] } @$data;
1053 $sth->bind_param_array( $placeholder_index, [@data], $attributes );
1054 $placeholder_index++;
1056 my $rv = eval { $sth->execute_array({ArrayTupleStatus => $tuple_status}) };
1059 ++$i while $i <= $#$tuple_status && !ref $tuple_status->[$i];
1061 $self->throw_exception($sth->errstr || "Unexpected populate error: $err")
1062 if ($i > $#$tuple_status);
1064 require Data::Dumper;
1065 local $Data::Dumper::Terse = 1;
1066 local $Data::Dumper::Indent = 1;
1067 local $Data::Dumper::Useqq = 1;
1068 local $Data::Dumper::Quotekeys = 0;
1070 $self->throw_exception(sprintf "%s for populate slice:\n%s",
1071 $tuple_status->[$i][1],
1072 Data::Dumper::Dumper(
1073 { map { $cols->[$_] => $data->[$i][$_] } (0 .. $#$cols) }
1077 $self->throw_exception($sth->errstr) if !$rv;
1079 $self->_query_end( $sql, @bind );
1080 return (wantarray ? ($rv, $sth, @bind) : $rv);
1084 my $self = shift @_;
1085 my $source = shift @_;
1086 my $bind_attributes = $self->source_bind_attributes($source);
1088 return $self->_execute('update' => [], $source, $bind_attributes, @_);
1093 my $self = shift @_;
1094 my $source = shift @_;
1096 my $bind_attrs = $self->source_bind_attributes($source);
1098 return $self->_execute('delete' => [], $source, $bind_attrs, @_);
1101 # We were sent here because the $rs contains a complex search
1102 # which will require a subquery to select the correct rows
1103 # (i.e. joined or limited resultsets)
1105 # Genarating a single PK column subquery is trivial and supported
1106 # by all RDBMS. However if we have a multicolumn PK, things get ugly.
1107 # Look at _multipk_update_delete()
1108 sub _subq_update_delete {
1110 my ($rs, $op, $values) = @_;
1112 my $rsrc = $rs->result_source;
1114 # we already check this, but double check naively just in case. Should be removed soon
1115 my $sel = $rs->_resolved_attrs->{select};
1116 $sel = [ $sel ] unless ref $sel eq 'ARRAY';
1117 my @pcols = $rsrc->primary_columns;
1118 if (@$sel != @pcols) {
1119 $self->throw_exception (
1120 'Subquery update/delete can not be called on resultsets selecting a'
1121 .' number of columns different than the number of primary keys'
1128 $op eq 'update' ? $values : (),
1129 { $pcols[0] => { -in => $rs->as_query } },
1134 return $self->_multipk_update_delete (@_);
1138 # ANSI SQL does not provide a reliable way to perform a multicol-PK
1139 # resultset update/delete involving subqueries. So by default resort
1140 # to simple (and inefficient) delete_all style per-row opearations,
1141 # while allowing specific storages to override this with a faster
1144 sub _multipk_update_delete {
1145 return shift->_per_row_update_delete (@_);
1148 # This is the default loop used to delete/update rows for multi PK
1149 # resultsets, and used by mysql exclusively (because it can't do anything
1152 # We do not use $row->$op style queries, because resultset update/delete
1153 # is not expected to cascade (this is what delete_all/update_all is for).
1155 # There should be no race conditions as the entire operation is rolled
1158 sub _per_row_update_delete {
1160 my ($rs, $op, $values) = @_;
1162 my $rsrc = $rs->result_source;
1163 my @pcols = $rsrc->primary_columns;
1165 my $guard = $self->txn_scope_guard;
1167 # emulate the return value of $sth->execute for non-selects
1168 my $row_cnt = '0E0';
1170 my $subrs_cur = $rs->cursor;
1171 while (my @pks = $subrs_cur->next) {
1174 for my $i (0.. $#pcols) {
1175 $cond->{$pcols[$i]} = $pks[$i];
1180 $op eq 'update' ? $values : (),
1194 my $sql_maker = $self->sql_maker;
1195 local $sql_maker->{for};
1196 return $self->_execute($self->_select_args(@_));
1199 sub _select_args_to_query {
1202 my $sql_maker = $self->sql_maker;
1203 local $sql_maker->{for};
1205 # my ($op, $bind, $ident, $bind_attrs, $select, $cond, $order, $rows, $offset)
1206 # = $self->_select_args($ident, $select, $cond, $attrs);
1207 my ($op, $bind, $ident, $bind_attrs, @args) =
1208 $self->_select_args(@_);
1210 # my ($sql, $bind) = $self->_prep_for_execute($op, $bind, $ident, [ $select, $cond, $order, $rows, $offset ]);
1211 my ($sql, $prepared_bind) = $self->_prep_for_execute($op, $bind, $ident, \@args);
1213 return \[ "($sql)", @{ $prepared_bind || [] }];
1217 my ($self, $ident, $select, $condition, $attrs) = @_;
1219 my $for = delete $attrs->{for};
1220 my $sql_maker = $self->sql_maker;
1221 $sql_maker->{for} = $for;
1224 { $attrs->{$_} ? ( $_ => $attrs->{$_} ) : () }
1225 (qw/order_by group_by having _virtual_order_by/ )
1229 my $bind_attrs = {};
1231 my $alias2source = $self->_resolve_ident_sources ($ident);
1233 for my $alias (keys %$alias2source) {
1234 my $bindtypes = $self->source_bind_attributes ($alias2source->{$alias}) || {};
1235 for my $col (keys %$bindtypes) {
1237 my $fqcn = join ('.', $alias, $col);
1238 $bind_attrs->{$fqcn} = $bindtypes->{$col} if $bindtypes->{$col};
1240 # so that unqualified searches can be bound too
1241 $bind_attrs->{$col} = $bind_attrs->{$fqcn} if $alias eq 'me';
1245 # This would be the point to deflate anything found in $condition
1246 # (and leave $attrs->{bind} intact). Problem is - inflators historically
1247 # expect a row object. And all we have is a resultsource (it is trivial
1248 # to extract deflator coderefs via $alias2source above).
1250 # I don't see a way forward other than changing the way deflators are
1251 # invoked, and that's just bad...
1253 my @args = ('select', $attrs->{bind}, $ident, $bind_attrs, $select, $condition, $order);
1254 if ($attrs->{software_limit} ||
1255 $sql_maker->_default_limit_syntax eq "GenericSubQ") {
1256 $attrs->{software_limit} = 1;
1258 $self->throw_exception("rows attribute must be positive if present")
1259 if (defined($attrs->{rows}) && !($attrs->{rows} > 0));
1261 # MySQL actually recommends this approach. I cringe.
1262 $attrs->{rows} = 2**48 if not defined $attrs->{rows} and defined $attrs->{offset};
1263 push @args, $attrs->{rows}, $attrs->{offset};
1268 sub _resolve_ident_sources {
1269 my ($self, $ident) = @_;
1271 my $alias2source = {};
1273 # the reason this is so contrived is that $ident may be a {from}
1274 # structure, specifying multiple tables to join
1275 if ( Scalar::Util::blessed($ident) && $ident->isa("DBIx::Class::ResultSource") ) {
1276 # this is compat mode for insert/update/delete which do not deal with aliases
1277 $alias2source->{me} = $ident;
1279 elsif (ref $ident eq 'ARRAY') {
1283 if (ref $_ eq 'HASH') {
1286 if (ref $_ eq 'ARRAY' and ref $_->[0] eq 'HASH') {
1290 $alias2source->{$tabinfo->{-alias}} = $tabinfo->{-result_source}
1291 if ($tabinfo->{-result_source});
1295 return $alias2source;
1299 my ($self, $source, $attrs) = @_;
1301 my $tmp_attrs = { %$attrs };
1303 # take off any pagers, record_filter is cdbi, and no point of ordering a count
1304 delete $tmp_attrs->{$_} for (qw/select as rows offset page order_by record_filter/);
1306 # overwrite the selector
1307 $tmp_attrs->{select} = { count => '*' };
1309 my $tmp_rs = $source->resultset_class->new($source, $tmp_attrs);
1310 my ($count) = $tmp_rs->cursor->next;
1312 # if the offset/rows attributes are still present, we did not use
1313 # a subquery, so we need to make the calculations in software
1314 $count -= $attrs->{offset} if $attrs->{offset};
1315 $count = $attrs->{rows} if $attrs->{rows} and $attrs->{rows} < $count;
1316 $count = 0 if ($count < 0);
1322 my ($self, $source, $attrs) = @_;
1324 # copy for the subquery, we need to do some adjustments to it too
1325 my $sub_attrs = { %$attrs };
1327 # these can not go in the subquery, and there is no point of ordering it
1328 delete $sub_attrs->{$_} for qw/prefetch collapse select as order_by/;
1330 # if we prefetch, we group_by primary keys only as this is what we would get out of the rs via ->next/->all
1331 # simply deleting group_by suffices, as the code below will re-fill it
1332 # Note: we check $attrs, as $sub_attrs has collapse deleted
1333 if (ref $attrs->{collapse} and keys %{$attrs->{collapse}} ) {
1334 delete $sub_attrs->{group_by};
1337 $sub_attrs->{group_by} ||= [ map { "$attrs->{alias}.$_" } ($source->primary_columns) ];
1338 $sub_attrs->{select} = $self->_grouped_count_select ($source, $sub_attrs);
1341 count_subq => $source->resultset_class->new ($source, $sub_attrs )->as_query
1344 # the subquery replaces this
1345 delete $attrs->{$_} for qw/where bind prefetch collapse group_by having having_bind rows offset page pager/;
1347 return $self->count ($source, $attrs);
1351 # Returns a SELECT to go with a supplied GROUP BY
1352 # (caled by count_grouped so a group_by is present)
1353 # Most databases expect them to match, but some
1354 # choke in various ways.
1356 sub _grouped_count_select {
1357 my ($self, $source, $rs_args) = @_;
1358 return $rs_args->{group_by};
1361 sub source_bind_attributes {
1362 my ($self, $source) = @_;
1364 my $bind_attributes;
1365 foreach my $column ($source->columns) {
1367 my $data_type = $source->column_info($column)->{data_type} || '';
1368 $bind_attributes->{$column} = $self->bind_attribute_by_data_type($data_type)
1372 return $bind_attributes;
1379 =item Arguments: $ident, $select, $condition, $attrs
1383 Handle a SQL select statement.
1389 my ($ident, $select, $condition, $attrs) = @_;
1390 return $self->cursor_class->new($self, \@_, $attrs);
1395 my ($rv, $sth, @bind) = $self->_select(@_);
1396 my @row = $sth->fetchrow_array;
1397 my @nextrow = $sth->fetchrow_array if @row;
1398 if(@row && @nextrow) {
1399 carp "Query returned more than one row. SQL that returns multiple rows is DEPRECATED for ->find and ->single";
1401 # Need to call finish() to work round broken DBDs
1410 =item Arguments: $sql
1414 Returns a L<DBI> sth (statement handle) for the supplied SQL.
1419 my ($self, $dbh, $sql) = @_;
1421 # 3 is the if_active parameter which avoids active sth re-use
1422 my $sth = $self->disable_sth_caching
1423 ? $dbh->prepare($sql)
1424 : $dbh->prepare_cached($sql, {}, 3);
1426 # XXX You would think RaiseError would make this impossible,
1427 # but apparently that's not true :(
1428 $self->throw_exception($dbh->errstr) if !$sth;
1434 my ($self, $sql) = @_;
1435 $self->dbh_do('_dbh_sth', $sql);
1438 sub _dbh_columns_info_for {
1439 my ($self, $dbh, $table) = @_;
1441 if ($dbh->can('column_info')) {
1444 my ($schema,$tab) = $table =~ /^(.+?)\.(.+)$/ ? ($1,$2) : (undef,$table);
1445 my $sth = $dbh->column_info( undef,$schema, $tab, '%' );
1447 while ( my $info = $sth->fetchrow_hashref() ){
1449 $column_info{data_type} = $info->{TYPE_NAME};
1450 $column_info{size} = $info->{COLUMN_SIZE};
1451 $column_info{is_nullable} = $info->{NULLABLE} ? 1 : 0;
1452 $column_info{default_value} = $info->{COLUMN_DEF};
1453 my $col_name = $info->{COLUMN_NAME};
1454 $col_name =~ s/^\"(.*)\"$/$1/;
1456 $result{$col_name} = \%column_info;
1459 return \%result if !$@ && scalar keys %result;
1463 my $sth = $dbh->prepare($self->sql_maker->select($table, undef, \'1 = 0'));
1465 my @columns = @{$sth->{NAME_lc}};
1466 for my $i ( 0 .. $#columns ){
1468 $column_info{data_type} = $sth->{TYPE}->[$i];
1469 $column_info{size} = $sth->{PRECISION}->[$i];
1470 $column_info{is_nullable} = $sth->{NULLABLE}->[$i] ? 1 : 0;
1472 if ($column_info{data_type} =~ m/^(.*?)\((.*?)\)$/) {
1473 $column_info{data_type} = $1;
1474 $column_info{size} = $2;
1477 $result{$columns[$i]} = \%column_info;
1481 foreach my $col (keys %result) {
1482 my $colinfo = $result{$col};
1483 my $type_num = $colinfo->{data_type};
1485 if(defined $type_num && $dbh->can('type_info')) {
1486 my $type_info = $dbh->type_info($type_num);
1487 $type_name = $type_info->{TYPE_NAME} if $type_info;
1488 $colinfo->{data_type} = $type_name if $type_name;
1495 sub columns_info_for {
1496 my ($self, $table) = @_;
1497 $self->dbh_do('_dbh_columns_info_for', $table);
1500 =head2 last_insert_id
1502 Return the row id of the last insert.
1506 sub _dbh_last_insert_id {
1507 # All Storage's need to register their own _dbh_last_insert_id
1508 # the old SQLite-based method was highly inappropriate
1511 my $class = ref $self;
1512 $self->throw_exception (<<EOE);
1514 No _dbh_last_insert_id() method found in $class.
1515 Since the method of obtaining the autoincrement id of the last insert
1516 operation varies greatly between different databases, this method must be
1517 individually implemented for every storage class.
1521 sub last_insert_id {
1523 $self->dbh_do('_dbh_last_insert_id', @_);
1528 Returns the database driver name.
1532 sub sqlt_type { shift->dbh->{Driver}->{Name} }
1534 =head2 bind_attribute_by_data_type
1536 Given a datatype from column info, returns a database specific bind
1537 attribute for C<< $dbh->bind_param($val,$attribute) >> or nothing if we will
1538 let the database planner just handle it.
1540 Generally only needed for special case column types, like bytea in postgres.
1544 sub bind_attribute_by_data_type {
1548 =head2 is_datatype_numeric
1550 Given a datatype from column_info, returns a boolean value indicating if
1551 the current RDBMS considers it a numeric value. This controls how
1552 L<DBIx::Class::Row/set_column> decides whether to mark the column as
1553 dirty - when the datatype is deemed numeric a C<< != >> comparison will
1554 be performed instead of the usual C<eq>.
1558 sub is_datatype_numeric {
1559 my ($self, $dt) = @_;
1561 return 0 unless $dt;
1563 return $dt =~ /^ (?:
1564 numeric | int(?:eger)? | (?:tiny|small|medium|big)int | dec(?:imal)? | real | float | double (?: \s+ precision)? | (?:big)?serial
1569 =head2 create_ddl_dir (EXPERIMENTAL)
1573 =item Arguments: $schema \@databases, $version, $directory, $preversion, \%sqlt_args
1577 Creates a SQL file based on the Schema, for each of the specified
1578 database engines in C<\@databases> in the given directory.
1579 (note: specify L<SQL::Translator> names, not L<DBI> driver names).
1581 Given a previous version number, this will also create a file containing
1582 the ALTER TABLE statements to transform the previous schema into the
1583 current one. Note that these statements may contain C<DROP TABLE> or
1584 C<DROP COLUMN> statements that can potentially destroy data.
1586 The file names are created using the C<ddl_filename> method below, please
1587 override this method in your schema if you would like a different file
1588 name format. For the ALTER file, the same format is used, replacing
1589 $version in the name with "$preversion-$version".
1591 See L<SQL::Translator/METHODS> for a list of values for C<\%sqlt_args>.
1592 The most common value for this would be C<< { add_drop_table => 1 } >>
1593 to have the SQL produced include a C<DROP TABLE> statement for each table
1594 created. For quoting purposes supply C<quote_table_names> and
1595 C<quote_field_names>.
1597 If no arguments are passed, then the following default values are assumed:
1601 =item databases - ['MySQL', 'SQLite', 'PostgreSQL']
1603 =item version - $schema->schema_version
1605 =item directory - './'
1607 =item preversion - <none>
1611 By default, C<\%sqlt_args> will have
1613 { add_drop_table => 1, ignore_constraint_names => 1, ignore_index_names => 1 }
1615 merged with the hash passed in. To disable any of those features, pass in a
1616 hashref like the following
1618 { ignore_constraint_names => 0, # ... other options }
1621 Note that this feature is currently EXPERIMENTAL and may not work correctly
1622 across all databases, or fully handle complex relationships.
1624 WARNING: Please check all SQL files created, before applying them.
1628 sub create_ddl_dir {
1629 my ($self, $schema, $databases, $version, $dir, $preversion, $sqltargs) = @_;
1631 if(!$dir || !-d $dir) {
1632 carp "No directory given, using ./\n";
1635 $databases ||= ['MySQL', 'SQLite', 'PostgreSQL'];
1636 $databases = [ $databases ] if(ref($databases) ne 'ARRAY');
1638 my $schema_version = $schema->schema_version || '1.x';
1639 $version ||= $schema_version;
1642 add_drop_table => 1,
1643 ignore_constraint_names => 1,
1644 ignore_index_names => 1,
1648 $self->throw_exception(q{Can't create a ddl file without SQL::Translator 0.09003: '}
1649 . $self->_check_sqlt_message . q{'})
1650 if !$self->_check_sqlt_version;
1652 my $sqlt = SQL::Translator->new( $sqltargs );
1654 $sqlt->parser('SQL::Translator::Parser::DBIx::Class');
1655 my $sqlt_schema = $sqlt->translate({ data => $schema })
1656 or $self->throw_exception ($sqlt->error);
1658 foreach my $db (@$databases) {
1660 $sqlt->{schema} = $sqlt_schema;
1661 $sqlt->producer($db);
1664 my $filename = $schema->ddl_filename($db, $version, $dir);
1665 if (-e $filename && ($version eq $schema_version )) {
1666 # if we are dumping the current version, overwrite the DDL
1667 carp "Overwriting existing DDL file - $filename";
1671 my $output = $sqlt->translate;
1673 carp("Failed to translate to $db, skipping. (" . $sqlt->error . ")");
1676 if(!open($file, ">$filename")) {
1677 $self->throw_exception("Can't open $filename for writing ($!)");
1680 print $file $output;
1683 next unless ($preversion);
1685 require SQL::Translator::Diff;
1687 my $prefilename = $schema->ddl_filename($db, $preversion, $dir);
1688 if(!-e $prefilename) {
1689 carp("No previous schema file found ($prefilename)");
1693 my $difffile = $schema->ddl_filename($db, $version, $dir, $preversion);
1695 carp("Overwriting existing diff file - $difffile");
1701 my $t = SQL::Translator->new($sqltargs);
1706 or $self->throw_exception ($t->error);
1708 my $out = $t->translate( $prefilename )
1709 or $self->throw_exception ($t->error);
1711 $source_schema = $t->schema;
1713 $source_schema->name( $prefilename )
1714 unless ( $source_schema->name );
1717 # The "new" style of producers have sane normalization and can support
1718 # diffing a SQL file against a DBIC->SQLT schema. Old style ones don't
1719 # And we have to diff parsed SQL against parsed SQL.
1720 my $dest_schema = $sqlt_schema;
1722 unless ( "SQL::Translator::Producer::$db"->can('preprocess_schema') ) {
1723 my $t = SQL::Translator->new($sqltargs);
1728 or $self->throw_exception ($t->error);
1730 my $out = $t->translate( $filename )
1731 or $self->throw_exception ($t->error);
1733 $dest_schema = $t->schema;
1735 $dest_schema->name( $filename )
1736 unless $dest_schema->name;
1739 my $diff = SQL::Translator::Diff::schema_diff($source_schema, $db,
1743 if(!open $file, ">$difffile") {
1744 $self->throw_exception("Can't write to $difffile ($!)");
1752 =head2 deployment_statements
1756 =item Arguments: $schema, $type, $version, $directory, $sqlt_args
1760 Returns the statements used by L</deploy> and L<DBIx::Class::Schema/deploy>.
1762 The L<SQL::Translator> (not L<DBI>) database driver name can be explicitly
1763 provided in C<$type>, otherwise the result of L</sqlt_type> is used as default.
1765 C<$directory> is used to return statements from files in a previously created
1766 L</create_ddl_dir> directory and is optional. The filenames are constructed
1767 from L<DBIx::Class::Schema/ddl_filename>, the schema name and the C<$version>.
1769 If no C<$directory> is specified then the statements are constructed on the
1770 fly using L<SQL::Translator> and C<$version> is ignored.
1772 See L<SQL::Translator/METHODS> for a list of values for C<$sqlt_args>.
1776 sub deployment_statements {
1777 my ($self, $schema, $type, $version, $dir, $sqltargs) = @_;
1778 # Need to be connected to get the correct sqlt_type
1779 $self->ensure_connected() unless $type;
1780 $type ||= $self->sqlt_type;
1781 $version ||= $schema->schema_version || '1.x';
1783 my $filename = $schema->ddl_filename($type, $version, $dir);
1787 open($file, "<$filename")
1788 or $self->throw_exception("Can't open $filename ($!)");
1791 return join('', @rows);
1794 $self->throw_exception(q{Can't deploy without SQL::Translator 0.09003: '}
1795 . $self->_check_sqlt_message . q{'})
1796 if !$self->_check_sqlt_version;
1798 require SQL::Translator::Parser::DBIx::Class;
1799 eval qq{use SQL::Translator::Producer::${type}};
1800 $self->throw_exception($@) if $@;
1802 # sources needs to be a parser arg, but for simplicty allow at top level
1804 $sqltargs->{parser_args}{sources} = delete $sqltargs->{sources}
1805 if exists $sqltargs->{sources};
1807 my $tr = SQL::Translator->new(%$sqltargs);
1808 SQL::Translator::Parser::DBIx::Class::parse( $tr, $schema );
1809 return "SQL::Translator::Producer::${type}"->can('produce')->($tr);
1813 my ($self, $schema, $type, $sqltargs, $dir) = @_;
1816 return if($line =~ /^--/);
1818 # next if($line =~ /^DROP/m);
1819 return if($line =~ /^BEGIN TRANSACTION/m);
1820 return if($line =~ /^COMMIT/m);
1821 return if $line =~ /^\s+$/; # skip whitespace only
1822 $self->_query_start($line);
1824 $self->dbh->do($line); # shouldn't be using ->dbh ?
1827 carp qq{$@ (running "${line}")};
1829 $self->_query_end($line);
1831 my @statements = $self->deployment_statements($schema, $type, undef, $dir, { %{ $sqltargs || {} }, no_comments => 1 } );
1832 if (@statements > 1) {
1833 foreach my $statement (@statements) {
1834 $deploy->( $statement );
1837 elsif (@statements == 1) {
1838 foreach my $line ( split(";\n", $statements[0])) {
1844 =head2 datetime_parser
1846 Returns the datetime parser class
1850 sub datetime_parser {
1852 return $self->{datetime_parser} ||= do {
1853 $self->ensure_connected;
1854 $self->build_datetime_parser(@_);
1858 =head2 datetime_parser_type
1860 Defines (returns) the datetime parser class - currently hardwired to
1861 L<DateTime::Format::MySQL>
1865 sub datetime_parser_type { "DateTime::Format::MySQL"; }
1867 =head2 build_datetime_parser
1869 See L</datetime_parser>
1873 sub build_datetime_parser {
1875 my $type = $self->datetime_parser_type(@_);
1877 $self->throw_exception("Couldn't load ${type}: $@") if $@;
1882 my $_check_sqlt_version; # private
1883 my $_check_sqlt_message; # private
1884 sub _check_sqlt_version {
1885 return $_check_sqlt_version if defined $_check_sqlt_version;
1886 eval 'use SQL::Translator "0.09003"';
1887 $_check_sqlt_message = $@ || '';
1888 $_check_sqlt_version = !$@;
1891 sub _check_sqlt_message {
1892 _check_sqlt_version if !defined $_check_sqlt_message;
1893 $_check_sqlt_message;
1897 =head2 is_replicating
1899 A boolean that reports if a particular L<DBIx::Class::Storage::DBI> is set to
1900 replicate from a master database. Default is undef, which is the result
1901 returned by databases that don't support replication.
1905 sub is_replicating {
1910 =head2 lag_behind_master
1912 Returns a number that represents a certain amount of lag behind a master db
1913 when a given storage is replicating. The number is database dependent, but
1914 starts at zero and increases with the amount of lag. Default in undef
1918 sub lag_behind_master {
1924 return if !$self->_dbh;
1933 =head2 DBIx::Class and AutoCommit
1935 DBIx::Class can do some wonderful magic with handling exceptions,
1936 disconnections, and transactions when you use C<< AutoCommit => 1 >>
1937 combined with C<txn_do> for transaction support.
1939 If you set C<< AutoCommit => 0 >> in your connect info, then you are always
1940 in an assumed transaction between commits, and you're telling us you'd
1941 like to manage that manually. A lot of the magic protections offered by
1942 this module will go away. We can't protect you from exceptions due to database
1943 disconnects because we don't know anything about how to restart your
1944 transactions. You're on your own for handling all sorts of exceptional
1945 cases if you choose the C<< AutoCommit => 0 >> path, just as you would
1952 Matt S. Trout <mst@shadowcatsystems.co.uk>
1954 Andy Grundman <andy@hybridized.org>
1958 You may distribute this code under the same terms as Perl itself.