1 package SQL::Translator;
3 # ----------------------------------------------------------------------
4 # $Id: Translator.pm,v 1.22 2003-04-17 23:16:28 allenday Exp $
5 # ----------------------------------------------------------------------
6 # Copyright (C) 2003 Ken Y. Clark <kclark@cpan.org>,
7 # darren chamberlain <darren@cpan.org>,
8 # Chris Mungall <cjm@fruitfly.org>
10 # This program is free software; you can redistribute it and/or
11 # modify it under the terms of the GNU General Public License as
12 # published by the Free Software Foundation; version 2.
14 # This program is distributed in the hope that it will be useful, but
15 # WITHOUT ANY WARRANTY; without even the implied warranty of
16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 # General Public License for more details.
19 # You should have received a copy of the GNU General Public License
20 # along with this program; if not, write to the Free Software
21 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
23 # -------------------------------------------------------------------
26 use vars qw( $VERSION $REVISION $DEFAULT_SUB $DEBUG $ERROR );
27 use base 'Class::Base';
30 $REVISION = sprintf "%d.%02d", q$Revision: 1.22 $ =~ /(\d+)\.(\d+)/;
31 $DEBUG = 0 unless defined $DEBUG;
36 use File::Spec::Functions qw(catfile);
37 use File::Basename qw(dirname);
40 # ----------------------------------------------------------------------
41 # The default behavior is to "pass through" values (note that the
42 # SQL::Translator instance is the first value ($_[0]), and the stuff
43 # to be parsed is the second value ($_[1])
44 # ----------------------------------------------------------------------
45 $DEFAULT_SUB = sub { $_[1] } unless defined $DEFAULT_SUB;
47 # ----------------------------------------------------------------------
51 # new takes an optional hash of arguments. These arguments may
52 # include a parser, specified with the keys "parser" or "from",
53 # and a producer, specified with the keys "producer" or "to".
55 # The values that can be passed as the parser or producer are
56 # given directly to the parser or producer methods, respectively.
57 # See the appropriate method description below for details about
58 # what each expects/accepts.
59 # ----------------------------------------------------------------------
61 my ( $self, $config ) = @_;
64 # Set the parser and producer.
66 # If a 'parser' or 'from' parameter is passed in, use that as the
67 # parser; if a 'producer' or 'to' parameter is passed in, use that
68 # as the producer; both default to $DEFAULT_SUB.
70 $self->parser ($config->{'parser'} || $config->{'from'} || $DEFAULT_SUB);
71 $self->producer($config->{'producer'} || $config->{'to'} || $DEFAULT_SUB);
74 # Set up callbacks for formatting of pk,fk,table,package names in producer
76 $self->format_table_name($config->{'format_table_name'});
77 $self->format_package_name($config->{'format_package_name'});
78 $self->format_fk_name($config->{'format_fk_name'});
79 $self->format_pk_name($config->{'format_pk_name'});
82 # Set the parser_args and producer_args
84 for my $pargs ( qw[ parser_args producer_args ] ) {
85 $self->$pargs( $config->{$pargs} ) if defined $config->{ $pargs };
89 # Set the data source, if 'filename' or 'file' is provided.
91 $config->{'filename'} ||= $config->{'file'} || "";
92 $self->filename( $config->{'filename'} ) if $config->{'filename'};
95 # Finally, if there is a 'data' parameter, use that in
96 # preference to filename and file
98 if ( my $data = $config->{'data'} ) {
103 # Set various other options.
105 $self->{'debug'} = defined $config->{'debug'} ? $config->{'debug'} : $DEBUG;
108 $self->add_drop_table( $config->{'add_drop_table'} );
110 $self->custom_translate( $config->{'xlate'} );
112 $self->no_comments( $config->{'no_comments'} );
114 $self->show_warnings( $config->{'show_warnings'} );
116 $self->trace( $config->{'trace'} );
121 # ----------------------------------------------------------------------
122 # add_drop_table([$bool])
123 # ----------------------------------------------------------------------
126 if ( defined (my $arg = shift) ) {
127 $self->{'add_drop_table'} = $arg ? 1 : 0;
129 return $self->{'add_drop_table'} || 0;
133 # ----------------------------------------------------------------------
134 # custom_translate([$bool])
135 # ----------------------------------------------------------------------
136 sub custom_translate {
138 $self->{'custom_translate'} = shift if @_;
139 return $self->{'custom_translate'} || {};
142 # ----------------------------------------------------------------------
143 # no_comments([$bool])
144 # ----------------------------------------------------------------------
148 if ( defined $arg ) {
149 $self->{'no_comments'} = $arg ? 1 : 0;
151 return $self->{'no_comments'} || 0;
155 # ----------------------------------------------------------------------
156 # producer([$producer_spec])
158 # Get or set the producer for the current translator.
159 # ----------------------------------------------------------------------
163 # producer as a mutator
165 my $producer = shift;
167 # Passed a module name (string containing "::")
168 if ($producer =~ /::/) {
171 # Module name was passed directly
172 # We try to load the name; if it doesn't load, there's
173 # a possibility that it has a function name attached to
175 if (load($producer)) {
176 $func_name = "produce";
179 # Module::function was passed
181 # Passed Module::Name::function; try to recover
182 my @func_parts = split /::/, $producer;
183 $func_name = pop @func_parts;
184 $producer = join "::", @func_parts;
186 # If this doesn't work, then we have a legitimate
188 load($producer) or die "Can't load $producer: $@";
191 # get code reference and assign
192 $self->{'producer'} = \&{ "$producer\::$func_name" };
193 $self->{'producer_type'} = $producer;
194 $self->debug("Got producer: $producer\::$func_name\n");
197 # passed an anonymous subroutine reference
198 elsif (isa($producer, 'CODE')) {
199 $self->{'producer'} = $producer;
200 $self->{'producer_type'} = "CODE";
201 $self->debug("Got producer: code ref\n");
204 # passed a string containing no "::"; relative package name
206 my $Pp = sprintf "SQL::Translator::Producer::$producer";
207 load($Pp) or die "Can't load $Pp: $@";
208 $self->{'producer'} = \&{ "$Pp\::produce" };
209 $self->{'producer_type'} = $Pp;
210 $self->debug("Got producer: $Pp\n");
213 # At this point, $self->{'producer'} contains a subroutine
214 # reference that is ready to run
216 # Anything left? If so, it's producer_args
217 $self->producer_args(@_) if (@_);
220 return $self->{'producer'};
223 # ----------------------------------------------------------------------
226 # producer_type is an accessor that allows producer subs to get
227 # information about their origin. This is poptentially important;
228 # since all producer subs are called as subroutine references, there is
229 # no way for a producer to find out which package the sub lives in
230 # originally, for example.
231 # ----------------------------------------------------------------------
232 sub producer_type { $_[0]->{'producer_type'} }
234 # ----------------------------------------------------------------------
235 # producer_args([\%args])
237 # Arbitrary name => value pairs of paramters can be passed to a
238 # producer using this method.
240 # If the first argument passed in is undef, then the hash of arguments
241 # is cleared; all subsequent elements are added to the hash of name,
242 # value pairs stored as producer_args.
243 # ----------------------------------------------------------------------
246 return $self->_args("producer", @_);
249 # ----------------------------------------------------------------------
250 # parser([$parser_spec])
251 # ----------------------------------------------------------------------
255 # parser as a mutator
259 # Passed a module name (string containing "::")
260 if ($parser =~ /::/) {
263 # Module name was passed directly
264 # We try to load the name; if it doesn't load, there's
265 # a possibility that it has a function name attached to
268 $func_name = "parse";
271 # Module::function was passed
273 # Passed Module::Name::function; try to recover
274 my @func_parts = split /::/, $parser;
275 $func_name = pop @func_parts;
276 $parser = join "::", @func_parts;
278 # If this doesn't work, then we have a legitimate
280 load($parser) or die "Can't load $parser: $@";
283 # get code reference and assign
284 $self->{'parser'} = \&{ "$parser\::$func_name" };
285 $self->{'parser_type'} = $parser;
286 $self->debug("Got parser: $parser\::$func_name\n");
289 # passed an anonymous subroutine reference
290 elsif ( isa( $parser, 'CODE' ) ) {
291 $self->{'parser'} = $parser;
292 $self->{'parser_type'} = "CODE";
293 $self->debug("Got parser: code ref\n");
296 # passed a string containing no "::"; relative package name
298 my $Pp = "SQL::Translator::Parser::$parser";
299 load( $Pp ) or die "Can't load $Pp: $@";
300 $self->{'parser'} = \&{ "$Pp\::parse" };
301 $self->{'parser_type'} = $Pp;
302 $self->debug("Got parser: $Pp\n");
306 # At this point, $self->{'parser'} contains a subroutine
307 # reference that is ready to run
309 $self->parser_args( @_ ) if (@_);
312 return $self->{'parser'};
315 # ----------------------------------------------------------------------
316 sub parser_type { $_[0]->{'parser_type'} }
320 return $self->_args("parser", @_);
326 if ( defined $arg ) {
327 $self->{'show_warnings'} = $arg ? 1 : 0;
329 return $self->{'show_warnings'} || 0;
333 # filename - get or set the filename
337 my $filename = shift;
339 my $msg = "Cannot use directory '$filename' as input source";
340 return $self->error($msg);
341 } elsif (-f _ && -r _) {
342 $self->{'filename'} = $filename;
343 $self->debug("Got filename: '$self->{'filename'}'\n");
345 my $msg = "Cannot use '$filename' as input source: ".
346 "file does not exist or is not readable.";
347 return $self->error($msg);
354 # ----------------------------------------------------------------------
357 # if $self->{'data'} is not set, but $self->{'filename'} is, then
358 # $self->{'filename'} is opened and read, with the results put into
360 # ----------------------------------------------------------------------
364 # Set $self->{'data'} based on what was passed in. We will
365 # accept a number of things; do our best to get it right.
368 if (isa($data, "SCALAR")) {
369 $self->{'data'} = $data;
372 if (isa($data, 'ARRAY')) {
373 $data = join '', @$data;
375 elsif (isa($data, 'GLOB')) {
379 elsif (! ref $data && @_) {
380 $data = join '', $data, @_;
382 $self->{'data'} = \$data;
386 # If we have a filename but no data yet, populate.
387 if (not $self->{'data'} and my $filename = $self->filename) {
388 $self->debug("Opening '$filename' to get contents.\n");
393 unless (open FH, $filename) {
394 return $self->error("Can't read file '$filename': $!");
398 $self->{'data'} = \$data;
401 return $self->error("Can't close file '$filename': $!");
405 return $self->{'data'};
412 if ( defined $arg ) {
413 $self->{'trace'} = $arg ? 1 : 0;
415 return $self->{'trace'} || 0;
418 # ----------------------------------------------------------------------
419 # translate([source], [\%args])
421 # translate does the actual translation. The main argument is the
422 # source of the data to be translated, which can be a filename, scalar
423 # reference, or glob reference.
425 # Alternatively, translate takes optional arguements, which are passed
426 # to the appropriate places. Most notable of these arguments are
427 # parser and producer, which can be used to set the parser and
428 # producer, respectively. This is the applications last chance to set
431 # translate returns a string.
432 # ----------------------------------------------------------------------
435 my ($args, $parser, $parser_type, $producer, $producer_type);
436 my ($parser_output, $producer_output);
440 # Passed a reference to a hash?
441 if (isa($_[0], 'HASH')) {
443 $self->debug("translate: Got a hashref\n");
447 # Passed a GLOB reference, i.e., filehandle
448 elsif (isa($_[0], 'GLOB')) {
449 $self->debug("translate: Got a GLOB reference\n");
453 # Passed a reference to a string containing the data
454 elsif (isa($_[0], 'SCALAR')) {
455 # passed a ref to a string
456 $self->debug("translate: Got a SCALAR reference (string)\n");
460 # Not a reference; treat it as a filename
461 elsif (! ref $_[0]) {
462 # Not a ref, it's a filename
463 $self->debug("translate: Got a filename\n");
464 $self->filename($_[0]);
467 # Passed something else entirely.
469 # We're not impressed. Take your empty string and leave.
472 # Actually, if data, parser, and producer are set, then we
473 # can continue. Too bad, because I like my comment
475 return "" unless ($self->data &&
481 # You must pass in a hash, or you get nothing.
486 # ----------------------------------------------------------------------
487 # Can specify the data to be transformed using "filename", "file",
488 # "data", or "datasource".
489 # ----------------------------------------------------------------------
490 if (my $filename = ($args->{'filename'} || $args->{'file'})) {
491 $self->filename($filename);
494 if (my $data = ($args->{'data'} || $args->{'datasource'})) {
498 # ----------------------------------------------------------------
500 # ----------------------------------------------------------------
501 my $data = $self->data;
502 unless (ref($data) eq 'SCALAR' and length $$data) {
503 return $self->error("Empty data file!");
506 # ----------------------------------------------------------------
507 # Local reference to the parser subroutine
508 # ----------------------------------------------------------------
509 if ($parser = ($args->{'parser'} || $args->{'from'})) {
510 $self->parser($parser);
512 $parser = $self->parser;
513 $parser_type = $self->parser_type;
515 # ----------------------------------------------------------------
516 # Local reference to the producer subroutine
517 # ----------------------------------------------------------------
518 if ($producer = ($args->{'producer'} || $args->{'to'})) {
519 $self->producer($producer);
521 $producer = $self->producer;
522 $producer_type = $self->producer_type;
524 # ----------------------------------------------------------------
525 # Execute the parser, then execute the producer with that output.
526 # Allowances are made for each piece to die, or fail to compile,
527 # since the referenced subroutines could be almost anything. In
528 # the future, each of these might happen in a Safe environment,
529 # depending on how paranoid we want to be.
530 # ----------------------------------------------------------------
531 eval { $parser_output = $parser->($self, $$data) };
532 if ($@ || ! $parser_output) {
533 my $msg = sprintf "translate: Error with parser '%s': %s",
534 $parser_type, ($@) ? $@ : " no results";
535 return $self->error($msg);
538 eval { $producer_output = $producer->($self, $parser_output) };
539 if ($@ || ! $producer_output) {
540 my $msg = sprintf "translate: Error with producer '%s': %s",
541 $producer_type, ($@) ? $@ : " no results";
542 return $self->error($msg);
545 return $producer_output;
548 # ----------------------------------------------------------------------
551 # Hacky sort of method to list all available parsers. This has
554 # - Only finds things in the SQL::Translator::Parser namespace
556 # - Only finds things that are located in the same directory
557 # as SQL::Translator::Parser. Yeck.
559 # This method will fail in several very likely cases:
561 # - Parser modules in different namespaces
563 # - Parser modules in the SQL::Translator::Parser namespace that
564 # have any XS componenets will be installed in
565 # arch_lib/SQL/Translator.
567 # ----------------------------------------------------------------------
569 return shift->_list("parser");
572 # ----------------------------------------------------------------------
575 # See notes for list_parsers(), above; all the problems apply to
576 # list_producers as well.
577 # ----------------------------------------------------------------------
579 return shift->_list("producer");
583 # ======================================================================
585 # ======================================================================
587 # ----------------------------------------------------------------------
588 # _args($type, \%args);
590 # Gets or sets ${type}_args. Called by parser_args and producer_args.
591 # ----------------------------------------------------------------------
595 $type = "${type}_args" unless $type =~ /_args$/;
597 unless (defined $self->{$type} && isa($self->{$type}, 'HASH')) {
598 $self->{$type} = { };
602 # If the first argument is an explicit undef (remember, we
603 # don't get here unless there is stuff in @_), then we clear
604 # out the producer_args hash.
605 if (! defined $_[0]) {
607 %{$self->{$type}} = ();
610 my $args = isa($_[0], 'HASH') ? shift : { @_ };
611 %{$self->{$type}} = (%{$self->{$type}}, %$args);
618 # ----------------------------------------------------------------------
620 # ----------------------------------------------------------------------
623 my $type = shift || return ();
624 my $uctype = ucfirst lc $type;
627 load("SQL::Translator::$uctype") or return ();
628 my $path = catfile "SQL", "Translator", $uctype;
630 my $dir = catfile $_, $path;
631 $self->debug("_list_${type}s searching $dir");
634 my $dh = IO::Dir->new($dir);
635 for (grep /\.pm$/, $dh->read) {
637 $found{ join "::", "SQL::Translator::$uctype", $_ } = 1;
644 # ----------------------------------------------------------------------
647 # Loads a Perl module. Short circuits if a module is already loaded.
648 # ----------------------------------------------------------------------
650 my $module = do { my $m = shift; $m =~ s[::][/]g; "$m.pm" };
651 return 1 if $INC{$module};
653 eval { require $module };
655 return __PACKAGE__->error($@) if ($@);
659 sub format_table_name {
662 $self->{_format_table_name} = $sub if ref($sub) eq 'CODE';
663 return $self->{_format_table_name}->($sub,@_) if defined($self->{_format_table_name});
667 sub format_package_name {
670 $self->{_format_package_name} = $sub if ref($sub) eq 'CODE';
671 return $self->{_format_package_name}->($sub,@_) if defined($self->{_format_package_name});
678 $self->{_format_fk_name} = $sub if ref($sub) eq 'CODE';
679 return $self->{_format_fk_name}->($sub,@_) if defined($self->{_format_fk_name});
686 $self->{_format_pk_name} = $sub if ref($sub) eq 'CODE';
687 return $self->{_format_pk_name}->($sub,@_) if defined($self->{_format_pk_name});
691 # ----------------------------------------------------------------------
694 # Calls UNIVERSAL::isa($ref, $type). I think UNIVERSAL::isa is ugly,
695 # but I like function overhead.
696 # ----------------------------------------------------------------------
698 my ($ref, $type) = @_;
699 return UNIVERSAL::isa($ref, $type);
703 #-----------------------------------------------------
704 # Rescue the drowning and tie your shoestrings.
705 # Henry David Thoreau
706 #-----------------------------------------------------
712 SQL::Translator - convert schema from one database to another
718 my $translator = SQL::Translator->new(
719 debug => 1, # Print debug info
720 trace => 0, # Print Parse::RecDescent trace
721 no_comments => 0, # Don't include comments in output
722 show_warnings => 0, # Print name mutations, conflicts
723 add_drop_table => 1, # Add "drop table" statements
725 #make all table names CAPS in producers which support this option
726 format_table_name => sub {my $tablename = shift; return uc($tablename)},
727 #null-op formatting, only here for documentation's sake
728 format_package_name => sub {return shift},
729 format_fk_name => sub {return shift},
730 format_pk_name => sub {return shift},
733 my $output = $translator->translate(
737 ) or die $translator->error;
743 This module attempts to simplify the task of converting one database
744 create syntax to another through the use of Parsers (which understand
745 the source format) and Producers (which understand the destination
746 format). The idea is that any Parser can be used with any Producer in
747 the conversion process. So, if you wanted Postgres-to-Oracle, you
748 would use the Postgres parser and the Oracle producer.
752 The constructor is called B<new>, and accepts a optional hash of options.
787 All options are, well, optional; these attributes can be set via
788 instance methods. Internally, they are; no (non-syntactical)
789 advantage is gained by passing options to the constructor.
793 =head2 B<add_drop_table>
795 Toggles whether or not to add "DROP TABLE" statements just before the
798 =head2 B<custom_translate>
800 Allows the user to override default translation of fields. For example,
801 if a MySQL "text" field would normally be converted to a "long" for Oracle,
802 the user could specify to change it to a "CLOB." Accepts a hashref where
803 keys are the "from" value and values are the "to," returns the current
806 =head2 B<no_comments>
808 Toggles whether to print comments in the output. Accepts a true or false
809 value, returns the current value.
813 The B<producer> method is an accessor/mutator, used to retrieve or
814 define what subroutine is called to produce the output. A subroutine
815 defined as a producer will be invoked as a function (I<not a method>)
816 and passed 2 parameters: its container C<SQL::Translator> instance and a
817 data structure. It is expected that the function transform the data
818 structure to a string. The C<SQL::Transformer> instance is provided for
819 informational purposes; for example, the type of the parser can be
820 retrieved using the B<parser_type> method, and the B<error> and
821 B<debug> methods can be called when needed.
823 When defining a producer, one of several things can be passed in: A
824 module name (e.g., C<My::Groovy::Producer>, a module name relative to
825 the C<SQL::Translator::Producer> namespace (e.g., MySQL), a module
826 name and function combination (C<My::Groovy::Producer::transmogrify>),
827 or a reference to an anonymous subroutine. If a full module name is
828 passed in (for the purposes of this method, a string containing "::"
829 is considered to be a module name), it is treated as a package, and a
830 function called "produce" will be invoked: C<$modulename::produce>.
831 If $modulename cannot be loaded, the final portion is stripped off and
832 treated as a function. In other words, if there is no file named
833 F<My/Groovy/Producer/transmogrify.pm>, C<SQL::Translator> will attempt
834 to load F<My/Groovy/Producer.pm> and use transmogrify as the name of
835 the function, instead of the default "produce".
837 my $tr = SQL::Translator->new;
839 # This will invoke My::Groovy::Producer::produce($tr, $data)
840 $tr->producer("My::Groovy::Producer");
842 # This will invoke SQL::Translator::Producer::Sybase::produce($tr, $data)
843 $tr->producer("Sybase");
845 # This will invoke My::Groovy::Producer::transmogrify($tr, $data),
846 # assuming that My::Groovy::Producer::transmogrify is not a module
848 $tr->producer("My::Groovy::Producer::transmogrify");
850 # This will invoke the referenced subroutine directly, as
851 # $subref->($tr, $data);
852 $tr->producer(\&my_producer);
854 There is also a method named B<producer_type>, which is a string
855 containing the classname to which the above B<produce> function
856 belongs. In the case of anonymous subroutines, this method returns
859 Finally, there is a method named B<producer_args>, which is both an
860 accessor and a mutator. Arbitrary data may be stored in name => value
861 pairs for the producer subroutine to access:
863 sub My::Random::producer {
864 my ($tr, $data) = @_;
865 my $pr_args = $tr->producer_args();
867 # $pr_args is a hashref.
869 Extra data passed to the B<producer> method is passed to
872 $tr->producer("xSV", delimiter => ',\s*');
874 # In SQL::Translator::Producer::xSV:
875 my $args = $tr->producer_args;
876 my $delimiter = $args->{'delimiter'}; # value is ,\s*
880 The B<parser> method defines or retrieves a subroutine that will be
881 called to perform the parsing. The basic idea is the same as that of
882 B<producer> (see above), except the default subroutine name is
883 "parse", and will be invoked as C<$module_name::parse($tr, $data)>.
884 Also, the parser subroutine will be passed a string containing the
885 entirety of the data to be parsed.
887 # Invokes SQL::Translator::Parser::MySQL::parse()
888 $tr->parser("MySQL");
890 # Invokes My::Groovy::Parser::parse()
891 $tr->parser("My::Groovy::Parser");
893 # Invoke an anonymous subroutine directly
895 my $dumper = Data::Dumper->new([ $_[1] ], [ "SQL" ]);
896 $dumper->Purity(1)->Terse(1)->Deepcopy(1);
897 return $dumper->Dump;
900 There is also B<parser_type> and B<parser_args>, which perform
901 analogously to B<producer_type> and B<producer_args>
903 =head2 B<show_warnings>
905 Toggles whether to print warnings of name conflicts, identifier
906 mutations, etc. Probably only generated by producers to let the user
907 know when something won't translate very smoothly (e.g., MySQL "enum"
908 fields into Oracle). Accepts a true or false value, returns the
913 The B<translate> method calls the subroutines referenced by the
914 B<parser> and B<producer> data members (described above). It accepts
915 as arguments a number of things, in key => value format, including
916 (potentially) a parser and a producer (they are passed directly to the
917 B<parser> and B<producer> methods).
919 Here is how the parameter list to B<translate> is parsed:
925 1 argument means it's the data to be parsed; which could be a string
926 (filename) or a reference to a scalar (a string stored in memory), or a
927 reference to a hash, which is parsed as being more than one argument
930 # Parse the file /path/to/datafile
931 my $output = $tr->translate("/path/to/datafile");
933 # Parse the data contained in the string $data
934 my $output = $tr->translate(\$data);
938 More than 1 argument means its a hash of things, and it might be
939 setting a parser, producer, or datasource (this key is named
940 "filename" or "file" if it's a file, or "data" for a SCALAR reference.
942 # As above, parse /path/to/datafile, but with different producers
943 for my $prod ("MySQL", "XML", "Sybase") {
944 print $tr->translate(
946 filename => "/path/to/datafile",
950 # The filename hash key could also be:
951 datasource => \$data,
957 =head2 B<filename>, B<data>
959 Using the B<filename> method, the filename of the data to be parsed
960 can be set. This method can be used in conjunction with the B<data>
961 method, below. If both the B<filename> and B<data> methods are
962 invoked as mutators, the data set in the B<data> method is used.
964 $tr->filename("/my/data/files/create.sql");
968 my $create_script = do {
970 open CREATE, "/my/data/files/create.sql" or die $!;
973 $tr->data(\$create_script);
975 B<filename> takes a string, which is interpreted as a filename.
976 B<data> takes a reference to a string, which is used as the data to be
977 parsed. If a filename is set, then that file is opened and read when
978 the B<translate> method is called, as long as the data instance
985 Turns on/off the tracing option of Parse::RecDescent.
991 Ken Y. Clark, E<lt>kclark@cpan.orgE<gt>,
992 darren chamberlain E<lt>darren@cpan.orgE<gt>,
993 Chris Mungall E<lt>cjm@fruitfly.orgE<gt>,
994 Allen Day E<lt>allenday@users.sourceforge.netE<gt>
998 This program is free software; you can redistribute it and/or modify
999 it under the terms of the GNU General Public License as published by
1000 the Free Software Foundation; version 2.
1002 This program is distributed in the hope that it will be useful, but
1003 WITHOUT ANY WARRANTY; without even the implied warranty of
1004 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
1005 General Public License for more details.
1007 You should have received a copy of the GNU General Public License
1008 along with this program; if not, write to the Free Software
1009 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
1014 Please use http://rt.cpan.org/ for reporting bugs.
1019 L<SQL::Translator::Parser>,
1020 L<SQL::Translator::Producer>,
1021 L<Parse::RecDescent>