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/);
237 DBIx::Class::Storage::DBI - DBI storage handler
243 This class represents the connection to the database
252 my $new = bless({}, ref $_[0] || $_[0]);
253 $new->cursor("DBIx::Class::Storage::DBI::Cursor");
254 $new->transaction_depth(0);
256 $new->debugobj(new DBIx::Class::Storage::Statistics());
259 if (defined($ENV{DBIX_CLASS_STORAGE_DBI_DEBUG}) &&
260 ($ENV{DBIX_CLASS_STORAGE_DBI_DEBUG} =~ /=(.+)$/)) {
261 $fh = IO::File->new($1, 'w')
262 or $new->throw_exception("Cannot open trace file $1");
264 $fh = IO::File->new('>&STDERR');
267 $new->debug(1) if $ENV{DBIX_CLASS_STORAGE_DBI_DEBUG};
271 =head2 throw_exception
273 Throws an exception - croaks.
277 sub throw_exception {
278 my ($self, $msg) = @_;
284 The arguments of C<connect_info> are always a single array reference.
286 This is normally accessed via L<DBIx::Class::Schema/connection>, which
287 encapsulates its argument list in an arrayref before calling
288 C<connect_info> here.
290 The arrayref can either contain the same set of arguments one would
291 normally pass to L<DBI/connect>, or a lone code reference which returns
292 a connected database handle.
294 In either case, there is an optional final element within the arrayref
295 which can hold a hashref of connection-specific Storage::DBI options.
296 These include C<on_connect_do>, and the sql_maker options
297 C<limit_dialect>, C<quote_char>, and C<name_sep>. Examples:
299 ->connect_info([ 'dbi:SQLite:./foo.db' ]);
301 ->connect_info([ sub { DBI->connect(...) } ]);
309 { quote_char => q{`}, name_sep => q{@} },
315 sub { DBI->connect(...) },
316 { quote_char => q{`}, name_sep => q{@} },
322 Executes the sql statements given as a listref on every db connect.
324 This option can also be set via L</connect_info>.
328 Causes SQL trace information to be emitted on the C<debugobj> object.
329 (or C<STDERR> if C<debugobj> has not specifically been set).
333 Set or retrieve the filehandle used for trace/debug output. This should be
334 an IO::Handle compatible ojbect (only the C<print> method is used. Initially
335 set to be STDERR - although see information on the
336 L<DBIX_CLASS_STORAGE_DBI_DEBUG> environment variable.
343 if ($self->debugobj->can('debugfh')) {
344 return $self->debugobj->debugfh(@_);
350 Sets or retrieves the object used for metric collection. Defaults to an instance
351 of L<DBIx::Class::Storage::Statistics> that is campatible with the original
352 method of using a coderef as a callback. See the aforementioned Statistics
353 class for more information.
357 Sets a callback to be executed each time a statement is run; takes a sub
358 reference. Callback is executed as $sub->($op, $info) where $op is
359 SELECT/INSERT/UPDATE/DELETE and $info is what would normally be printed.
361 See L<debugobj> for a better way.
368 if ($self->debugobj->can('callback')) {
369 return $self->debugobj->callback(@_);
375 Disconnect the L<DBI> handle, performing a rollback first if the
376 database is not in C<AutoCommit> mode.
383 if( $self->connected ) {
384 $self->_dbh->rollback unless $self->_dbh->{AutoCommit};
385 $self->_dbh->disconnect;
392 Check if the L<DBI> handle is connected. Returns true if the handle
397 sub connected { my ($self) = @_;
399 if(my $dbh = $self->_dbh) {
400 if(defined $self->_conn_tid && $self->_conn_tid != threads->tid) {
401 $self->_sql_maker(undef);
402 return $self->_dbh(undef);
404 elsif($self->_conn_pid != $$) {
405 $self->_dbh->{InactiveDestroy} = 1;
406 $self->_sql_maker(undef);
407 return $self->_dbh(undef)
409 return ($dbh->FETCH('Active') && $dbh->ping);
415 =head2 ensure_connected
417 Check whether the database handle is connected - if not then make a
422 sub ensure_connected {
425 unless ($self->connected) {
426 $self->_populate_dbh;
432 Returns the dbh - a data base handle of class L<DBI>.
439 $self->ensure_connected;
443 sub _sql_maker_args {
446 return ( limit_dialect => $self->dbh );
451 Returns a C<sql_maker> object - normally an object of class
452 C<DBIC::SQL::Abstract>.
458 unless ($self->_sql_maker) {
459 $self->_sql_maker(new DBIC::SQL::Abstract( $self->_sql_maker_args ));
461 return $self->_sql_maker;
465 my ($self, $info_arg) = @_;
469 my $info = [ @$info_arg ]; # copy because we can alter it
470 my $last_info = $info->[-1];
471 if(ref $last_info eq 'HASH') {
473 if(my $on_connect_do = $last_info->{on_connect_do}) {
475 $self->on_connect_do($on_connect_do);
477 for my $sql_maker_opt (qw/limit_dialect quote_char name_sep/) {
478 if(my $opt_val = $last_info->{$sql_maker_opt}) {
480 $sql_maker_opts{$sql_maker_opt} = $opt_val;
484 # remove our options hashref if it was there, to avoid confusing
485 # DBI in the case the user didn't use all 4 DBI options, as in:
486 # [ 'dbi:SQLite:foo.db', { quote_char => q{`} } ]
487 pop(@$info) if $used;
490 $self->_connect_info($info);
491 $self->sql_maker->$_($sql_maker_opts{$_}) for(keys %sql_maker_opts);
494 $self->_connect_info;
499 my @info = @{$self->_connect_info || []};
500 $self->_dbh($self->_connect(@info));
502 if(ref $self eq 'DBIx::Class::Storage::DBI') {
503 my $driver = $self->_dbh->{Driver}->{Name};
504 if ($self->load_optional_class("DBIx::Class::Storage::DBI::${driver}")) {
505 bless $self, "DBIx::Class::Storage::DBI::${driver}";
506 $self->_rebless() if $self->can('_rebless');
510 # if on-connect sql statements are given execute them
511 foreach my $sql_statement (@{$self->on_connect_do || []}) {
512 $self->debugobj->query_start($sql_statement) if $self->debug();
513 $self->_dbh->do($sql_statement);
514 $self->debugobj->query_end($sql_statement) if $self->debug();
517 $self->_conn_pid($$);
518 $self->_conn_tid(threads->tid) if $INC{'threads.pm'};
522 my ($self, @info) = @_;
524 $self->throw_exception("You failed to provide any connection info")
527 my ($old_connect_via, $dbh);
529 if ($INC{'Apache/DBI.pm'} && $ENV{MOD_PERL}) {
530 $old_connect_via = $DBI::connect_via;
531 $DBI::connect_via = 'connect';
535 $dbh = ref $info[0] eq 'CODE'
537 : DBI->connect(@info);
540 $DBI::connect_via = $old_connect_via if $old_connect_via;
543 $self->throw_exception("DBI Connection failed: " . ($@ || $DBI::errstr));
551 Calls begin_work on the current dbh.
553 See L<DBIx::Class::Schema> for the txn_do() method, which allows for
554 an entire code block to be executed transactionally.
560 if ($self->{transaction_depth}++ == 0) {
561 my $dbh = $self->dbh;
562 if ($dbh->{AutoCommit}) {
563 $self->debugobj->txn_begin()
572 Issues a commit against the current dbh.
578 my $dbh = $self->dbh;
579 if ($self->{transaction_depth} == 0) {
580 unless ($dbh->{AutoCommit}) {
581 $self->debugobj->txn_commit()
587 if (--$self->{transaction_depth} == 0) {
588 $self->debugobj->txn_commit()
597 Issues a rollback against the current dbh. A nested rollback will
598 throw a L<DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION> exception,
599 which allows the rollback to propagate to the outermost transaction.
607 my $dbh = $self->dbh;
608 if ($self->{transaction_depth} == 0) {
609 unless ($dbh->{AutoCommit}) {
610 $self->debugobj->txn_rollback()
616 if (--$self->{transaction_depth} == 0) {
617 $self->debugobj->txn_rollback()
622 die DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION->new;
629 my $exception_class = "DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION";
630 $error =~ /$exception_class/ and $self->throw_exception($error);
631 $self->{transaction_depth} = 0; # ensure that a failed rollback
632 $self->throw_exception($error); # resets the transaction depth
637 my ($self, $op, $extra_bind, $ident, @args) = @_;
638 my ($sql, @bind) = $self->sql_maker->$op($ident, @args);
639 unshift(@bind, @$extra_bind) if $extra_bind;
641 my @debug_bind = map { defined $_ ? qq{'$_'} : q{'NULL'} } @bind;
642 $self->debugobj->query_start($sql, @debug_bind);
644 my $sth = eval { $self->sth($sql,$op) };
647 $self->throw_exception(
648 'no sth generated via sql (' . ($@ || $self->_dbh->errstr) . "): $sql"
651 @bind = map { ref $_ ? ''.$_ : $_ } @bind; # stringify args
655 $rv = eval { $sth->execute(@bind) };
658 $self->throw_exception("Error executing '$sql': ".($@ || $sth->errstr));
661 $self->throw_exception("'$sql' did not generate a statement.");
664 my @debug_bind = map { defined $_ ? qq{`$_'} : q{`NULL'} } @bind;
665 $self->debugobj->query_end($sql, @debug_bind);
667 return (wantarray ? ($rv, $sth, @bind) : $rv);
671 my ($self, $ident, $to_insert) = @_;
672 $self->throw_exception(
673 "Couldn't insert ".join(', ',
674 map "$_ => $to_insert->{$_}", keys %$to_insert
676 ) unless ($self->_execute('insert' => [], $ident, $to_insert));
681 return shift->_execute('update' => [], @_);
685 return shift->_execute('delete' => [], @_);
689 my ($self, $ident, $select, $condition, $attrs) = @_;
690 my $order = $attrs->{order_by};
691 if (ref $condition eq 'SCALAR') {
692 $order = $1 if $$condition =~ s/ORDER BY (.*)$//i;
694 if (exists $attrs->{group_by} || $attrs->{having}) {
696 group_by => $attrs->{group_by},
697 having => $attrs->{having},
698 ($order ? (order_by => $order) : ())
701 my @args = ('select', $attrs->{bind}, $ident, $select, $condition, $order);
702 if ($attrs->{software_limit} ||
703 $self->sql_maker->_default_limit_syntax eq "GenericSubQ") {
704 $attrs->{software_limit} = 1;
706 $self->throw_exception("rows attribute must be positive if present")
707 if (defined($attrs->{rows}) && !($attrs->{rows} > 0));
708 push @args, $attrs->{rows}, $attrs->{offset};
710 return $self->_execute(@args);
715 Handle a SQL select statement.
721 my ($ident, $select, $condition, $attrs) = @_;
722 return $self->cursor->new($self, \@_, $attrs);
727 Performs a select, fetch and return of data - handles a single row
732 # Need to call finish() to work round broken DBDs
736 my ($rv, $sth, @bind) = $self->_select(@_);
737 my @row = $sth->fetchrow_array;
744 Returns a L<DBI> sth (statement handle) for the supplied SQL.
749 my ($self, $sql) = @_;
750 # 3 is the if_active parameter which avoids active sth re-use
751 return $self->dbh->prepare_cached($sql, {}, 3);
754 =head2 columns_info_for
756 Returns database type info for a given table columns.
760 sub columns_info_for {
761 my ($self, $table) = @_;
763 my $dbh = $self->dbh;
765 if ($dbh->can('column_info')) {
767 my $old_raise_err = $dbh->{RaiseError};
768 my $old_print_err = $dbh->{PrintError};
769 $dbh->{RaiseError} = 1;
770 $dbh->{PrintError} = 0;
772 my ($schema,$tab) = $table =~ /^(.+?)\.(.+)$/ ? ($1,$2) : (undef,$table);
773 my $sth = $dbh->column_info( undef,$schema, $tab, '%' );
775 while ( my $info = $sth->fetchrow_hashref() ){
777 $column_info{data_type} = $info->{TYPE_NAME};
778 $column_info{size} = $info->{COLUMN_SIZE};
779 $column_info{is_nullable} = $info->{NULLABLE} ? 1 : 0;
780 $column_info{default_value} = $info->{COLUMN_DEF};
781 my $col_name = $info->{COLUMN_NAME};
782 $col_name =~ s/^\"(.*)\"$/$1/;
784 $result{$col_name} = \%column_info;
787 $dbh->{RaiseError} = $old_raise_err;
788 $dbh->{PrintError} = $old_print_err;
789 return \%result if !$@;
793 my $sth = $dbh->prepare("SELECT * FROM $table WHERE 1=0");
795 my @columns = @{$sth->{NAME_lc}};
796 for my $i ( 0 .. $#columns ){
798 my $type_num = $sth->{TYPE}->[$i];
800 if(defined $type_num && $dbh->can('type_info')) {
801 my $type_info = $dbh->type_info($type_num);
802 $type_name = $type_info->{TYPE_NAME} if $type_info;
804 $column_info{data_type} = $type_name ? $type_name : $type_num;
805 $column_info{size} = $sth->{PRECISION}->[$i];
806 $column_info{is_nullable} = $sth->{NULLABLE}->[$i] ? 1 : 0;
808 if ($column_info{data_type} =~ m/^(.*?)\((.*?)\)$/) {
809 $column_info{data_type} = $1;
810 $column_info{size} = $2;
813 $result{$columns[$i]} = \%column_info;
819 =head2 last_insert_id
821 Return the row id of the last insert.
826 my ($self, $row) = @_;
828 return $self->dbh->func('last_insert_rowid');
834 Returns the database driver name.
838 sub sqlt_type { shift->dbh->{Driver}->{Name} }
840 =head2 create_ddl_dir (EXPERIMENTAL)
844 =item Arguments: $schema \@databases, $version, $directory, $sqlt_args
848 Creates an SQL file based on the Schema, for each of the specified
849 database types, in the given directory.
851 Note that this feature is currently EXPERIMENTAL and may not work correctly
852 across all databases, or fully handle complex relationships.
858 my ($self, $schema, $databases, $version, $dir, $sqltargs) = @_;
860 if(!$dir || !-d $dir)
862 warn "No directory given, using ./\n";
865 $databases ||= ['MySQL', 'SQLite', 'PostgreSQL'];
866 $databases = [ $databases ] if(ref($databases) ne 'ARRAY');
867 $version ||= $schema->VERSION || '1.x';
869 eval "use SQL::Translator";
870 $self->throw_exception("Can't deploy without SQL::Translator: $@") if $@;
872 my $sqlt = SQL::Translator->new({
876 foreach my $db (@$databases)
879 $sqlt->parser('SQL::Translator::Parser::DBIx::Class');
880 # $sqlt->parser_args({'DBIx::Class' => $schema);
881 $sqlt->data($schema);
882 $sqlt->producer($db);
885 my $filename = $schema->ddl_filename($db, $dir, $version);
888 $self->throw_exception("$filename already exists, skipping $db");
891 open($file, ">$filename")
892 or $self->throw_exception("Can't open $filename for writing ($!)");
893 my $output = $sqlt->translate;
895 # print join(":", keys %{$schema->source_registrations});
896 # print Dumper($sqlt->schema);
899 $self->throw_exception("Failed to translate to $db. (" . $sqlt->error . ")");
908 =head2 deployment_statements
910 Create the statements for L</deploy> and
911 L<DBIx::Class::Schema/deploy>.
915 sub deployment_statements {
916 my ($self, $schema, $type, $version, $dir, $sqltargs) = @_;
917 # Need to be connected to get the correct sqlt_type
918 $self->ensure_connected();
919 $type ||= $self->sqlt_type;
920 $version ||= $schema->VERSION || '1.x';
922 eval "use SQL::Translator";
925 eval "use SQL::Translator::Parser::DBIx::Class;";
926 $self->throw_exception($@) if $@;
927 eval "use SQL::Translator::Producer::${type};";
928 $self->throw_exception($@) if $@;
929 my $tr = SQL::Translator->new(%$sqltargs);
930 SQL::Translator::Parser::DBIx::Class::parse( $tr, $schema );
931 return "SQL::Translator::Producer::${type}"->can('produce')->($tr);
934 my $filename = $schema->ddl_filename($type, $dir, $version);
937 # $schema->create_ddl_dir([ $type ], $version, $dir, $sqltargs);
938 $self->throw_exception("No SQL::Translator, and no Schema file found, aborting deploy");
942 open($file, "<$filename")
943 or $self->throw_exception("Can't open $filename ($!)");
947 return join('', @rows);
953 Sends the appropriate statements to create or modify tables to the
954 db. This would normally be called through
955 L<DBIx::Class::Schema/deploy>.
960 my ($self, $schema, $type, $sqltargs) = @_;
961 foreach my $statement ( $self->deployment_statements($schema, $type, undef, undef, $sqltargs) ) {
962 for ( split(";\n", $statement)) {
963 next if($_ =~ /^--/);
965 # next if($_ =~ /^DROP/m);
966 next if($_ =~ /^BEGIN TRANSACTION/m);
967 next if($_ =~ /^COMMIT/m);
968 $self->debugobj->query_start($_) if $self->debug;
969 $self->dbh->do($_) or warn "SQL was:\n $_";
970 $self->debugobj->query_end($_) if $self->debug;
975 =head2 datetime_parser
977 Returns the datetime parser class
981 sub datetime_parser {
983 return $self->{datetime_parser} ||= $self->build_datetime_parser(@_);
986 =head2 datetime_parser_type
988 Defines (returns) the datetime parser class - currently hardwired to
989 L<DateTime::Format::MySQL>
993 sub datetime_parser_type { "DateTime::Format::MySQL"; }
995 =head2 build_datetime_parser
997 See L</datetime_parser>
1001 sub build_datetime_parser {
1003 my $type = $self->datetime_parser_type(@_);
1005 $self->throw_exception("Couldn't load ${type}: $@") if $@;
1009 sub DESTROY { shift->disconnect }
1015 The module defines a set of methods within the DBIC::SQL::Abstract
1016 namespace. These build on L<SQL::Abstract::Limit> to provide the
1017 SQL query functions.
1019 The following methods are extended:-
1033 Accessor for setting limit dialect. This is useful
1034 for JDBC-bridge among others where the remote SQL-dialect cannot
1035 be determined by the name of the driver alone.
1037 This option can also be set via L</connect_info>.
1041 Specifies what characters to use to quote table and column names. If
1042 you use this you will want to specify L<name_sep> as well.
1044 quote_char expectes either a single character, in which case is it is placed
1045 on either side of the table/column, or an arrayref of length 2 in which case the
1046 table/column name is placed between the elements.
1048 For example under MySQL you'd use C<quote_char('`')>, and user SQL Server you'd
1049 use C<quote_char(qw/[ ]/)>.
1051 This option can also be set via L</connect_info>.
1055 This only needs to be used in conjunction with L<quote_char>, and is used to
1056 specify the charecter that seperates elements (schemas, tables, columns) from
1057 each other. In most cases this is simply a C<.>.
1059 This option can also be set via L</connect_info>.
1063 =head1 ENVIRONMENT VARIABLES
1065 =head2 DBIX_CLASS_STORAGE_DBI_DEBUG
1067 If C<DBIX_CLASS_STORAGE_DBI_DEBUG> is set then SQL trace information
1068 is produced (as when the L<debug> method is set).
1070 If the value is of the form C<1=/path/name> then the trace output is
1071 written to the file C</path/name>.
1073 This environment variable is checked when the storage object is first
1074 created (when you call connect on your schema). So, run-time changes
1075 to this environment variable will not take effect unless you also
1076 re-connect on your schema.
1080 Matt S. Trout <mst@shadowcatsystems.co.uk>
1082 Andy Grundman <andy@hybridized.org>
1086 You may distribute this code under the same terms as Perl itself.