1 package DBIx::Class::Storage::DBI;
2 # -*- mode: cperl; cperl-indent-level: 2 -*-
4 use base 'DBIx::Class::Storage';
9 use SQL::Abstract::Limit;
10 use DBIx::Class::Storage::DBI::Cursor;
11 use DBIx::Class::Storage::Statistics;
13 use Carp::Clan qw/DBIx::Class/;
16 package DBIC::SQL::Abstract; # Would merge upstream, but nate doesn't reply :(
18 use base qw/SQL::Abstract::Limit/;
21 my ($self, $table, $fields, $where, $order, @rest) = @_;
22 $table = $self->_quote($table) unless ref($table);
23 @rest = (-1) unless defined $rest[0];
24 die "LIMIT 0 Does Not Compute" if $rest[0] == 0;
25 # and anyway, SQL::Abstract::Limit will cause a barf if we don't first
26 local $self->{having_bind} = [];
27 my ($sql, @ret) = $self->SUPER::select(
28 $table, $self->_recurse_fields($fields), $where, $order, @rest
30 return wantarray ? ($sql, @ret, @{$self->{having_bind}}) : $sql;
36 $table = $self->_quote($table) unless ref($table);
37 $self->SUPER::insert($table, @_);
43 $table = $self->_quote($table) unless ref($table);
44 $self->SUPER::update($table, @_);
50 $table = $self->_quote($table) unless ref($table);
51 $self->SUPER::delete($table, @_);
57 return $_[1].$self->_order_by($_[2]);
59 return $self->SUPER::_emulate_limit(@_);
64 my ($self, $fields) = @_;
65 my $ref = ref $fields;
66 return $self->_quote($fields) unless $ref;
67 return $$fields if $ref eq 'SCALAR';
69 if ($ref eq 'ARRAY') {
70 return join(', ', map { $self->_recurse_fields($_) } @$fields);
71 } elsif ($ref eq 'HASH') {
72 foreach my $func (keys %$fields) {
73 return $self->_sqlcase($func)
74 .'( '.$self->_recurse_fields($fields->{$func}).' )';
83 if (ref $_[0] eq 'HASH') {
84 if (defined $_[0]->{group_by}) {
85 $ret = $self->_sqlcase(' group by ')
86 .$self->_recurse_fields($_[0]->{group_by});
88 if (defined $_[0]->{having}) {
90 ($frag, @extra) = $self->_recurse_where($_[0]->{having});
91 push(@{$self->{having_bind}}, @extra);
92 $ret .= $self->_sqlcase(' having ').$frag;
94 if (defined $_[0]->{order_by}) {
95 $ret .= $self->SUPER::_order_by($_[0]->{order_by});
97 } elsif(ref $_[0] eq 'SCALAR') {
98 $ret = $self->_sqlcase(' order by ').${ $_[0] };
100 $ret = $self->SUPER::_order_by(@_);
105 sub _order_directions {
106 my ($self, $order) = @_;
107 $order = $order->{order_by} if ref $order eq 'HASH';
108 return $self->SUPER::_order_directions($order);
112 my ($self, $from) = @_;
113 if (ref $from eq 'ARRAY') {
114 return $self->_recurse_from(@$from);
115 } elsif (ref $from eq 'HASH') {
116 return $self->_make_as($from);
118 return $from; # would love to quote here but _table ends up getting called
119 # twice during an ->select without a limit clause due to
120 # the way S::A::Limit->select works. should maybe consider
121 # bypassing this and doing S::A::select($self, ...) in
122 # our select method above. meantime, quoting shims have
123 # been added to select/insert/update/delete here
128 my ($self, $from, @join) = @_;
130 push(@sqlf, $self->_make_as($from));
131 foreach my $j (@join) {
134 # check whether a join type exists
135 my $join_clause = '';
136 my $to_jt = ref($to) eq 'ARRAY' ? $to->[0] : $to;
137 if (ref($to_jt) eq 'HASH' and exists($to_jt->{-join_type})) {
138 $join_clause = ' '.uc($to_jt->{-join_type}).' JOIN ';
140 $join_clause = ' JOIN ';
142 push(@sqlf, $join_clause);
144 if (ref $to eq 'ARRAY') {
145 push(@sqlf, '(', $self->_recurse_from(@$to), ')');
147 push(@sqlf, $self->_make_as($to));
149 push(@sqlf, ' ON ', $self->_join_condition($on));
151 return join('', @sqlf);
155 my ($self, $from) = @_;
156 return join(' ', map { (ref $_ eq 'SCALAR' ? $$_ : $self->_quote($_)) }
157 reverse each %{$self->_skip_options($from)});
161 my ($self, $hash) = @_;
163 $clean_hash->{$_} = $hash->{$_}
164 for grep {!/^-/} keys %$hash;
168 sub _join_condition {
169 my ($self, $cond) = @_;
170 if (ref $cond eq 'HASH') {
173 my $x = '= '.$self->_quote($cond->{$_}); $j{$_} = \$x;
175 return $self->_recurse_where(\%j);
176 } elsif (ref $cond eq 'ARRAY') {
177 return join(' OR ', map { $self->_join_condition($_) } @$cond);
179 die "Can't handle this yet!";
184 my ($self, $label) = @_;
185 return '' unless defined $label;
186 return "*" if $label eq '*';
187 return $label unless $self->{quote_char};
188 if(ref $self->{quote_char} eq "ARRAY"){
189 return $self->{quote_char}->[0] . $label . $self->{quote_char}->[1]
190 if !defined $self->{name_sep};
191 my $sep = $self->{name_sep};
192 return join($self->{name_sep},
193 map { $self->{quote_char}->[0] . $_ . $self->{quote_char}->[1] }
194 split(/\Q$sep\E/,$label));
196 return $self->SUPER::_quote($label);
202 $_[0] =~ s/SELECT (.*?) FROM/
203 'SELECT '.join(', ', map { $_.' AS col'.++$c } split(', ', $1)).' FROM'/e;
204 $self->SUPER::_RowNum(@_);
209 $self->{limit_dialect} = shift if @_;
210 return $self->{limit_dialect};
215 $self->{quote_char} = shift if @_;
216 return $self->{quote_char};
221 $self->{name_sep} = shift if @_;
222 return $self->{name_sep};
225 } # End of BEGIN block
227 use base qw/DBIx::Class/;
229 __PACKAGE__->load_components(qw/AccessorGroup/);
231 __PACKAGE__->mk_group_accessors('simple' =>
232 qw/_connect_info _dbh _sql_maker _conn_pid _conn_tid debug debugobj
233 cursor on_connect_do transaction_depth/);
240 my $new = bless({}, ref $_[0] || $_[0]);
241 $new->cursor("DBIx::Class::Storage::DBI::Cursor");
242 $new->transaction_depth(0);
244 $new->debugobj(new DBIx::Class::Storage::Statistics());
247 if (defined($ENV{DBIX_CLASS_STORAGE_DBI_DEBUG}) &&
248 ($ENV{DBIX_CLASS_STORAGE_DBI_DEBUG} =~ /=(.+)$/)) {
249 $fh = IO::File->new($1, 'w')
250 or $new->throw_exception("Cannot open trace file $1");
252 $fh = IO::File->new('>&STDERR');
255 $new->debug(1) if $ENV{DBIX_CLASS_STORAGE_DBI_DEBUG};
259 =head2 throw_exception
261 Throws an exception - croaks.
265 sub throw_exception {
266 my ($self, $msg) = @_;
272 DBIx::Class::Storage::DBI - DBI storage handler
278 This class represents the connection to the database
286 The arguments of C<connect_info> are always a single array reference.
288 This is normally accessed via L<DBIx::Class::Schema/connection>, which
289 encapsulates its argument list in an arrayref before calling
290 C<connect_info> here.
292 The arrayref can either contain the same set of arguments one would
293 normally pass to L<DBI/connect>, or a lone code reference which returns
294 a connected database handle.
296 In either case, there is an optional final element within the arrayref
297 which can hold a hashref of connection-specific Storage::DBI options.
298 These include C<on_connect_do>, and the sql_maker options
299 C<limit_dialect>, C<quote_char>, and C<name_sep>. Examples:
301 ->connect_info([ 'dbi:SQLite:./foo.db' ]);
303 ->connect_info([ sub { DBI->connect(...) } ]);
311 { quote_char => q{`}, name_sep => q{@} },
317 sub { DBI->connect(...) },
318 { quote_char => q{`}, name_sep => q{@} },
324 Executes the sql statements given as a listref on every db connect.
326 This option can also be set via L</connect_info>.
330 Causes SQL trace information to be emitted on the C<debugobj> object.
331 (or C<STDERR> if C<debugobj> has not specifically been set).
335 Set or retrieve the filehandle used for trace/debug output. This should be
336 an IO::Handle compatible ojbect (only the C<print> method is used. Initially
337 set to be STDERR - although see information on the
338 L<DBIX_CLASS_STORAGE_DBI_DEBUG> environment variable.
345 if ($self->debugobj->can('debugfh')) {
346 return $self->debugobj->debugfh(@_);
352 Sets or retrieves the object used for metric collection. Defaults to an instance
353 of L<DBIx::Class::Storage::Statistics> that is campatible with the original
354 method of using a coderef as a callback. See the aforementioned Statistics
355 class for more information.
359 Sets a callback to be executed each time a statement is run; takes a sub
360 reference. Callback is executed as $sub->($op, $info) where $op is
361 SELECT/INSERT/UPDATE/DELETE and $info is what would normally be printed.
363 See L<debugobj> for a better way.
370 if ($self->debugobj->can('callback')) {
371 return $self->debugobj->callback(@_);
377 Disconnect the L<DBI> handle, performing a rollback first if the
378 database is not in C<AutoCommit> mode.
385 if( $self->connected ) {
386 $self->_dbh->rollback unless $self->_dbh->{AutoCommit};
387 $self->_dbh->disconnect;
394 Check if the L<DBI> handle is connected. Returns true if the handle
399 sub connected { my ($self) = @_;
401 if(my $dbh = $self->_dbh) {
402 if(defined $self->_conn_tid && $self->_conn_tid != threads->tid) {
403 $self->_sql_maker(undef);
404 return $self->_dbh(undef);
406 elsif($self->_conn_pid != $$) {
407 $self->_dbh->{InactiveDestroy} = 1;
408 $self->_sql_maker(undef);
409 return $self->_dbh(undef)
411 return ($dbh->FETCH('Active') && $dbh->ping);
417 =head2 ensure_connected
419 Check whether the database handle is connected - if not then make a
424 sub ensure_connected {
427 unless ($self->connected) {
428 $self->_populate_dbh;
434 Returns the dbh - a data base handle of class L<DBI>.
441 $self->ensure_connected;
445 sub _sql_maker_args {
448 return ( limit_dialect => $self->dbh );
453 Returns a C<sql_maker> object - normally an object of class
454 C<DBIC::SQL::Abstract>.
460 unless ($self->_sql_maker) {
461 $self->_sql_maker(new DBIC::SQL::Abstract( $self->_sql_maker_args ));
463 return $self->_sql_maker;
467 my ($self, $info_arg) = @_;
470 my $info = [ @$info_arg ]; # copy because we can alter it
471 my $last_info = $info->[-1];
472 if(ref $last_info eq 'HASH') {
474 if(my $on_connect_do = $last_info->{on_connect_do}) {
476 $self->on_connect_do($on_connect_do);
478 for my $sql_maker_opt (qw/limit_dialect quote_char name_sep/) {
479 if(my $opt_val = $last_info->{$sql_maker_opt}) {
481 $self->sql_maker->$sql_maker_opt($opt_val);
485 # remove our options hashref if it was there, to avoid confusing
486 # DBI in the case the user didn't use all 4 DBI options, as in:
487 # [ 'dbi:SQLite:foo.db', { quote_char => q{`} } ]
488 pop(@$info) if $used;
491 $self->_connect_info($info);
494 $self->_connect_info;
499 my @info = @{$self->_connect_info || []};
500 $self->_dbh($self->_connect(@info));
501 my $driver = $self->_dbh->{Driver}->{Name};
502 eval "require DBIx::Class::Storage::DBI::${driver}";
504 bless $self, "DBIx::Class::Storage::DBI::${driver}";
505 $self->_rebless() if $self->can('_rebless');
507 # if on-connect sql statements are given execute them
508 foreach my $sql_statement (@{$self->on_connect_do || []}) {
509 $self->debugobj->query_start($sql_statement) if $self->debug();
510 $self->_dbh->do($sql_statement);
511 $self->debugobj->query_end($sql_statement) if $self->debug();
514 $self->_conn_pid($$);
515 $self->_conn_tid(threads->tid) if $INC{'threads.pm'};
519 my ($self, @info) = @_;
521 $self->throw_exception("You failed to provide any connection info")
524 my ($old_connect_via, $dbh);
526 if ($INC{'Apache/DBI.pm'} && $ENV{MOD_PERL}) {
527 $old_connect_via = $DBI::connect_via;
528 $DBI::connect_via = 'connect';
532 $dbh = ref $info[0] eq 'CODE'
534 : DBI->connect(@info);
537 $DBI::connect_via = $old_connect_via if $old_connect_via;
540 $self->throw_exception("DBI Connection failed: " . ($@ || $DBI::errstr));
548 Calls begin_work on the current dbh.
550 See L<DBIx::Class::Schema> for the txn_do() method, which allows for
551 an entire code block to be executed transactionally.
557 if ($self->{transaction_depth}++ == 0) {
558 my $dbh = $self->dbh;
559 if ($dbh->{AutoCommit}) {
560 $self->debugobj->txn_begin()
569 Issues a commit against the current dbh.
575 my $dbh = $self->dbh;
576 if ($self->{transaction_depth} == 0) {
577 unless ($dbh->{AutoCommit}) {
578 $self->debugobj->txn_commit()
584 if (--$self->{transaction_depth} == 0) {
585 $self->debugobj->txn_commit()
594 Issues a rollback against the current dbh. A nested rollback will
595 throw a L<DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION> exception,
596 which allows the rollback to propagate to the outermost transaction.
604 my $dbh = $self->dbh;
605 if ($self->{transaction_depth} == 0) {
606 unless ($dbh->{AutoCommit}) {
607 $self->debugobj->txn_rollback()
613 if (--$self->{transaction_depth} == 0) {
614 $self->debugobj->txn_rollback()
619 die DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION->new;
626 my $exception_class = "DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION";
627 $error =~ /$exception_class/ and $self->throw_exception($error);
628 $self->{transaction_depth} = 0; # ensure that a failed rollback
629 $self->throw_exception($error); # resets the transaction depth
634 my ($self, $op, $extra_bind, $ident, @args) = @_;
635 my ($sql, @bind) = $self->sql_maker->$op($ident, @args);
636 unshift(@bind, @$extra_bind) if $extra_bind;
638 my @debug_bind = map { defined $_ ? qq{'$_'} : q{'NULL'} } @bind;
639 $self->debugobj->query_start($sql, @debug_bind);
641 my $sth = eval { $self->sth($sql,$op) };
644 $self->throw_exception(
645 'no sth generated via sql (' . ($@ || $self->_dbh->errstr) . "): $sql"
648 @bind = map { ref $_ ? ''.$_ : $_ } @bind; # stringify args
652 $rv = eval { $sth->execute(@bind) };
655 $self->throw_exception("Error executing '$sql': ".($@ || $sth->errstr));
658 $self->throw_exception("'$sql' did not generate a statement.");
661 my @debug_bind = map { defined $_ ? qq{`$_'} : q{`NULL'} } @bind;
662 $self->debugobj->query_end($sql, @debug_bind);
664 return (wantarray ? ($rv, $sth, @bind) : $rv);
668 my ($self, $ident, $to_insert) = @_;
669 $self->throw_exception(
670 "Couldn't insert ".join(', ',
671 map "$_ => $to_insert->{$_}", keys %$to_insert
673 ) unless ($self->_execute('insert' => [], $ident, $to_insert));
678 return shift->_execute('update' => [], @_);
682 return shift->_execute('delete' => [], @_);
686 my ($self, $ident, $select, $condition, $attrs) = @_;
687 my $order = $attrs->{order_by};
688 if (ref $condition eq 'SCALAR') {
689 $order = $1 if $$condition =~ s/ORDER BY (.*)$//i;
691 if (exists $attrs->{group_by} || $attrs->{having}) {
693 group_by => $attrs->{group_by},
694 having => $attrs->{having},
695 ($order ? (order_by => $order) : ())
698 my @args = ('select', $attrs->{bind}, $ident, $select, $condition, $order);
699 if ($attrs->{software_limit} ||
700 $self->sql_maker->_default_limit_syntax eq "GenericSubQ") {
701 $attrs->{software_limit} = 1;
703 $self->throw_exception("rows attribute must be positive if present")
704 if (defined($attrs->{rows}) && !($attrs->{rows} > 0));
705 push @args, $attrs->{rows}, $attrs->{offset};
707 return $self->_execute(@args);
712 Handle a SQL select statement.
718 my ($ident, $select, $condition, $attrs) = @_;
719 return $self->cursor->new($self, \@_, $attrs);
724 Performs a select, fetch and return of data - handles a single row
729 # Need to call finish() to work round broken DBDs
733 my ($rv, $sth, @bind) = $self->_select(@_);
734 my @row = $sth->fetchrow_array;
741 Returns a L<DBI> sth (statement handle) for the supplied SQL.
746 my ($self, $sql) = @_;
747 # 3 is the if_active parameter which avoids active sth re-use
748 return $self->dbh->prepare_cached($sql, {}, 3);
751 =head2 columns_info_for
753 Returns database type info for a given table columns.
757 sub columns_info_for {
758 my ($self, $table) = @_;
760 my $dbh = $self->dbh;
762 if ($dbh->can('column_info')) {
764 my $old_raise_err = $dbh->{RaiseError};
765 my $old_print_err = $dbh->{PrintError};
766 $dbh->{RaiseError} = 1;
767 $dbh->{PrintError} = 0;
769 my ($schema,$tab) = $table =~ /^(.+?)\.(.+)$/ ? ($1,$2) : (undef,$table);
770 my $sth = $dbh->column_info( undef,$schema, $tab, '%' );
772 while ( my $info = $sth->fetchrow_hashref() ){
774 $column_info{data_type} = $info->{TYPE_NAME};
775 $column_info{size} = $info->{COLUMN_SIZE};
776 $column_info{is_nullable} = $info->{NULLABLE} ? 1 : 0;
777 $column_info{default_value} = $info->{COLUMN_DEF};
778 my $col_name = $info->{COLUMN_NAME};
779 $col_name =~ s/^\"(.*)\"$/$1/;
781 $result{$col_name} = \%column_info;
784 $dbh->{RaiseError} = $old_raise_err;
785 $dbh->{PrintError} = $old_print_err;
786 return \%result if !$@;
790 my $sth = $dbh->prepare("SELECT * FROM $table WHERE 1=0");
792 my @columns = @{$sth->{NAME_lc}};
793 for my $i ( 0 .. $#columns ){
795 my $type_num = $sth->{TYPE}->[$i];
797 if(defined $type_num && $dbh->can('type_info')) {
798 my $type_info = $dbh->type_info($type_num);
799 $type_name = $type_info->{TYPE_NAME} if $type_info;
801 $column_info{data_type} = $type_name ? $type_name : $type_num;
802 $column_info{size} = $sth->{PRECISION}->[$i];
803 $column_info{is_nullable} = $sth->{NULLABLE}->[$i] ? 1 : 0;
805 if ($column_info{data_type} =~ m/^(.*?)\((.*?)\)$/) {
806 $column_info{data_type} = $1;
807 $column_info{size} = $2;
810 $result{$columns[$i]} = \%column_info;
816 =head2 last_insert_id
818 Return the row id of the last insert.
823 my ($self, $row) = @_;
825 return $self->dbh->func('last_insert_rowid');
831 Returns the database driver name.
835 sub sqlt_type { shift->dbh->{Driver}->{Name} }
837 =head2 create_ddl_dir (EXPERIMENTAL)
841 =item Arguments: $schema \@databases, $version, $directory, $sqlt_args
845 Creates an SQL file based on the Schema, for each of the specified
846 database types, in the given directory.
848 Note that this feature is currently EXPERIMENTAL and may not work correctly
849 across all databases, or fully handle complex relationships.
855 my ($self, $schema, $databases, $version, $dir, $sqltargs) = @_;
857 if(!$dir || !-d $dir)
859 warn "No directory given, using ./\n";
862 $databases ||= ['MySQL', 'SQLite', 'PostgreSQL'];
863 $databases = [ $databases ] if(ref($databases) ne 'ARRAY');
864 $version ||= $schema->VERSION || '1.x';
866 eval "use SQL::Translator";
867 $self->throw_exception("Can't deploy without SQL::Translator: $@") if $@;
869 my $sqlt = SQL::Translator->new({
873 foreach my $db (@$databases)
876 $sqlt->parser('SQL::Translator::Parser::DBIx::Class');
877 # $sqlt->parser_args({'DBIx::Class' => $schema);
878 $sqlt->data($schema);
879 $sqlt->producer($db);
882 my $filename = $schema->ddl_filename($db, $dir, $version);
885 $self->throw_exception("$filename already exists, skipping $db");
888 open($file, ">$filename")
889 or $self->throw_exception("Can't open $filename for writing ($!)");
890 my $output = $sqlt->translate;
892 # print join(":", keys %{$schema->source_registrations});
893 # print Dumper($sqlt->schema);
896 $self->throw_exception("Failed to translate to $db. (" . $sqlt->error . ")");
905 =head2 deployment_statements
907 Create the statements for L</deploy> and
908 L<DBIx::Class::Schema/deploy>.
912 sub deployment_statements {
913 my ($self, $schema, $type, $version, $dir, $sqltargs) = @_;
914 $type ||= $self->sqlt_type;
915 $version ||= $schema->VERSION || '1.x';
917 eval "use SQL::Translator";
920 eval "use SQL::Translator::Parser::DBIx::Class;";
921 $self->throw_exception($@) if $@;
922 eval "use SQL::Translator::Producer::${type};";
923 $self->throw_exception($@) if $@;
924 my $tr = SQL::Translator->new(%$sqltargs);
925 SQL::Translator::Parser::DBIx::Class::parse( $tr, $schema );
926 return "SQL::Translator::Producer::${type}"->can('produce')->($tr);
929 my $filename = $schema->ddl_filename($type, $dir, $version);
932 # $schema->create_ddl_dir([ $type ], $version, $dir, $sqltargs);
933 $self->throw_exception("No SQL::Translator, and no Schema file found, aborting deploy");
937 open($file, "<$filename")
938 or $self->throw_exception("Can't open $filename ($!)");
942 return join('', @rows);
948 Sends the appropriate statements to create or modify tables to the
949 db. This would normally be called through
950 L<DBIx::Class::Schema/deploy>.
955 my ($self, $schema, $type, $sqltargs) = @_;
956 foreach my $statement ( $self->deployment_statements($schema, $type, undef, undef, $sqltargs) ) {
957 for ( split(";\n", $statement)) {
958 next if($_ =~ /^--/);
960 # next if($_ =~ /^DROP/m);
961 next if($_ =~ /^BEGIN TRANSACTION/m);
962 next if($_ =~ /^COMMIT/m);
963 $self->debugobj->query_begin($_) if $self->debug;
964 $self->dbh->do($_) or warn "SQL was:\n $_";
965 $self->debugobj->query_end($_) if $self->debug;
970 =head2 datetime_parser
972 Returns the datetime parser class
976 sub datetime_parser {
978 return $self->{datetime_parser} ||= $self->build_datetime_parser(@_);
981 =head2 datetime_parser_type
983 Defines (returns) the datetime parser class - currently hardwired to
984 L<DateTime::Format::MySQL>
988 sub datetime_parser_type { "DateTime::Format::MySQL"; }
990 =head2 build_datetime_parser
992 See L</datetime_parser>
996 sub build_datetime_parser {
998 my $type = $self->datetime_parser_type(@_);
1000 $self->throw_exception("Couldn't load ${type}: $@") if $@;
1004 sub DESTROY { shift->disconnect }
1010 The module defines a set of methods within the DBIC::SQL::Abstract
1011 namespace. These build on L<SQL::Abstract::Limit> to provide the
1012 SQL query functions.
1014 The following methods are extended:-
1028 Accessor for setting limit dialect. This is useful
1029 for JDBC-bridge among others where the remote SQL-dialect cannot
1030 be determined by the name of the driver alone.
1032 This option can also be set via L</connect_info>.
1036 Specifies what characters to use to quote table and column names. If
1037 you use this you will want to specify L<name_sep> as well.
1039 quote_char expectes either a single character, in which case is it is placed
1040 on either side of the table/column, or an arrayref of length 2 in which case the
1041 table/column name is placed between the elements.
1043 For example under MySQL you'd use C<quote_char('`')>, and user SQL Server you'd
1044 use C<quote_char(qw/[ ]/)>.
1046 This option can also be set via L</connect_info>.
1050 This only needs to be used in conjunction with L<quote_char>, and is used to
1051 specify the charecter that seperates elements (schemas, tables, columns) from
1052 each other. In most cases this is simply a C<.>.
1054 This option can also be set via L</connect_info>.
1058 =head1 ENVIRONMENT VARIABLES
1060 =head2 DBIX_CLASS_STORAGE_DBI_DEBUG
1062 If C<DBIX_CLASS_STORAGE_DBI_DEBUG> is set then SQL trace information
1063 is produced (as when the L<debug> method is set).
1065 If the value is of the form C<1=/path/name> then the trace output is
1066 written to the file C</path/name>.
1068 This environment variable is checked when the storage object is first
1069 created (when you call connect on your schema). So, run-time changes
1070 to this environment variable will not take effect unless you also
1071 re-connect on your schema.
1075 Matt S. Trout <mst@shadowcatsystems.co.uk>
1077 Andy Grundman <andy@hybridized.org>
1081 You may distribute this code under the same terms as Perl itself.