4 # -------------------------------------------------------------------
5 # $Id: sqlt-diff,v 1.8 2005-06-28 23:05:47 duality72 Exp $
6 # -------------------------------------------------------------------
7 # Copyright (C) 2002-4 The SQLFairy Authors
9 # This program is free software; you can redistribute it and/or
10 # modify it under the terms of the GNU General Public License as
11 # published by the Free Software Foundation; version 2.
13 # This program is distributed in the hope that it will be useful, but
14 # WITHOUT ANY WARRANTY; without even the implied warranty of
15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 # General Public License for more details.
18 # You should have received a copy of the GNU General Public License
19 # along with this program; if not, write to the Free Software
20 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
22 # -------------------------------------------------------------------
26 sqlt-diff - find the differences b/w two schemas
34 For a list of all valid parsers:
40 sqlt-diff [options] file_name1=parser file_name2=parser
44 -d|--debug Show debugging info
48 sqlt-diff is a utility for creating a file of SQL commands necessary to
49 transform the first schema provided to the second. While not yet
50 exhaustive in its ability to mutate the entire schema, it will report the
57 Using the Producer class of the target (second) schema, any tables missing
58 in the first schema will be generated in their entirety (fields, constraints,
61 =item * Missing/altered fields
63 Any fields missing or altered between the two schemas will be reported
66 ALTER TABLE <table_name>
68 [CHANGE <field_name> <datatype> (<size>)] ;
70 =item * Missing/altered indices
72 Any indices missing or of a different type or on different fields will be
73 indicated. Indices that should be dropped will be reported as such:
75 DROP INDEX <index_name> ON <table_name> ;
77 An index of a different type or on different fields will be reported as a
80 CREATE [<index_type>] INDEX [<index_name>] ON <table_name>
81 ( <field_name>[,<field_name>] ) ;
85 "ALTER/DROP TABLE" and "CREATE INDEX" statements B<are not> generated by
86 the Producer, unfortunately, and may require massaging before being passed to
91 # -------------------------------------------------------------------
97 use SQL::Translator::Schema::Constants;
99 use vars qw( $VERSION );
100 $VERSION = sprintf "%d.%02d", q$Revision: 1.8 $ =~ /(\d+)\.(\d+)/;
102 my ( @input, $list, $help, $debug );
103 for my $arg ( @ARGV ) {
104 if ( $arg =~ m/^-?-l(ist)?$/ ) {
107 elsif ( $arg =~ m/^-?-h(elp)?$/ ) {
110 elsif ( $arg =~ m/^-?-d(ebug)?$/ ) {
113 elsif ( $arg =~ m/^([^=]+)=(.+)$/ ) {
114 push @input, { file => $1, parser => $2 };
117 pod2usage( msg => "Unknown argument '$arg'" );
121 pod2usage(1) if $help;
122 pod2usage('Please specify only two schemas to diff') if scalar @input > 2;
124 my $tr = SQL::Translator->new;
125 my @parsers = $tr->list_parsers;
126 my %valid_parsers = map { $_, 1 } @parsers;
129 print "\nParsers:\n", map { "\t$_\n" } sort @parsers;
134 pod2usage( msg => 'Too many file args' ) if @input > 2;
136 my ( $source_schema, $source_db, $target_schema, $target_db );
138 for my $in ( @input ) {
139 my $file = $in->{'file'};
140 my $parser = $in->{'parser'};
142 die "Unable to read file '$file'\n" unless -r $file;
143 die "'$parser' is an invalid parser\n" unless $valid_parsers{ $parser };
145 my $t = SQL::Translator->new;
147 $t->parser( $parser ) or die $tr->error;
148 $t->producer( 'YAML' ) or die $tr->error;
149 my $out = $t->translate( $file ) or die $tr->error;
150 my $schema = $t->schema;
151 unless ( $schema->name ) {
152 $schema->name( $file );
156 $source_schema = $schema;
157 $source_db = $parser;
160 $target_schema = $schema;
161 $target_db = $parser;
165 my $case_insensitive = $target_db =~ /SQLServer/;
167 my $s1_name = $source_schema->name;
168 my $s2_name = $target_schema->name;
169 my ( @new_tables, @diffs , @diffs_at_end);
170 for my $t1 ( $source_schema->get_tables ) {
171 my $t1_name = $t1->name;
172 my $t2 = $target_schema->get_table( $t1_name, $case_insensitive );
174 warn "TABLE '$s1_name.$t1_name'\n" if $debug;
176 warn "Couldn't find table '$s1_name.$t1_name' in '$s2_name'\n"
178 if ( $target_db =~ /SQLServer/ ) {
179 for my $constraint ( $t1->get_constraints ) {
180 next if $constraint->type eq PRIMARY_KEY;
181 push @diffs_at_end, "ALTER TABLE $t1_name ADD ".
182 constraint_to_string($constraint, $source_schema).";";
183 $t1->drop_constraint($constraint);
186 push @new_tables, $t1;
190 # Go through our options
191 my $options_different = 0;
194 for my $t1_option_ref ( $t1->options ) {
195 my($key1, $value1) = %{$t1_option_ref};
196 for my $t2_option_ref ( $t2->options ) {
197 my($key2, $value2) = %{$t2_option_ref};
198 if ( $key1 eq $key2 ) {
199 if ( defined $value1 != defined $value2 ) {
200 $options_different = 1;
203 if ( defined $value1 && $value1 ne $value2 ) {
204 $options_different = 1;
207 $checkedOptions{$key1} = 1;
211 $options_different = 1;
214 # Go through the other table's options
215 unless ( $options_different ) {
216 for my $t2_option_ref ( $t2->options ) {
217 my($key, $value) = %{$t2_option_ref};
218 next if $checkedOptions{$key};
219 $options_different = 1;
223 # If there's a difference, just re-set all the options
224 my @diffs_table_options;
225 if ( $options_different ) {
227 foreach my $option_ref ( $t1->options ) {
228 my($key, $value) = %{$option_ref};
229 push(@options, defined $value ? "$key=$value" : $key);
231 my $options = join(' ', @options);
232 @diffs_table_options = ("ALTER TABLE $t1_name $options;");
235 my $t2_name = $t2->name;
236 my(@diffs_table_adds, @diffs_table_changes);
237 for my $t1_field ( $t1->get_fields ) {
238 my $f1_type = $t1_field->data_type;
239 my $f1_size = $t1_field->size;
240 my $f1_name = $t1_field->name;
241 my $f1_nullable = $t1_field->is_nullable;
242 my $f1_default = $t1_field->default_value;
243 my $f1_auto_inc = $t1_field->is_auto_increment;
244 my $t2_field = $t2->get_field( $f1_name );
245 my $f1_full_name = "$s1_name.$t1_name.$t1_name";
246 warn "FIELD '$f1_full_name'\n" if $debug;
248 my $f2_full_name = "$s2_name.$t2_name.$f1_name";
250 unless ( $t2_field ) {
251 warn "Couldn't find field '$f2_full_name' in '$t2_name'\n"
253 my $temp_default_value = 0;
254 if ( $target_db =~ /SQLServer/ && !$f1_nullable && !defined $f1_default ) {
255 # SQL Server doesn't allow adding non-nullable, non-default columns
256 # so we add it with a default value, then remove the default value
257 $temp_default_value = 1;
258 my(@numeric_types) = qw(decimal numeric float real int bigint smallint tinyint);
259 $f1_default = grep($_ eq $f1_type, @numeric_types) ? 0 : '';
261 push @diffs_table_adds, sprintf( "ALTER TABLE %s ADD %s %s%s%s%s%s;",
262 $t1_name, $f1_name, $f1_type,
263 ($f1_size && $f1_type !~ /(blob|text)$/) ? "($f1_size)" : '',
264 $f1_nullable ? '' : ' NOT NULL',
265 !defined $f1_default ? ''
266 : uc $f1_default eq 'NULL' ? ' DEFAULT NULL'
267 : uc $f1_default eq 'CURRENT_TIMESTAMP' ? ' DEFAULT CURRENT_TIMESTAMP'
268 : " DEFAULT '$f1_default'",
269 $f1_auto_inc ? ' AUTO_INCREMENT' : '',
271 if ( $temp_default_value ) {
273 push @diffs_table_adds, sprintf( <<END
274 DECLARE \@defname VARCHAR(100), \@cmd VARCHAR(1000)
277 FROM sysobjects so JOIN sysconstraints sc
278 ON so.id = sc.constid
279 WHERE object_name(so.parent_obj) = '%s'
282 (SELECT colid FROM syscolumns
283 WHERE id = object_id('%s') AND
285 SET \@cmd = 'ALTER TABLE %s DROP CONSTRAINT '
289 , $t1_name, $t1_name, $f1_name, $t1_name,
295 my $f2_type = $t2_field->data_type;
296 my $f2_size = $t2_field->size || '';
297 my $f2_nullable = $t2_field->is_nullable;
298 my $f2_default = $t2_field->default_value;
299 my $f2_auto_inc = $t2_field->is_auto_increment;
300 if ( !$t1_field->equals($t2_field, $case_insensitive) ) {
301 # SQLServer timestamp fields can't be altered, so we drop and add instead
302 if ( $target_db =~ /SQLServer/ && $f2_type eq "timestamp" ) {
303 push @diffs_table_changes, "ALTER TABLE $t1_name DROP COLUMN $f1_name;";
304 push @diffs_table_changes, sprintf( "ALTER TABLE %s ADD %s %s%s%s%s%s;",
305 $t1_name, $f1_name, $f1_type,
306 ($f1_size && $f1_type !~ /(blob|text)$/) ? "($f1_size)" : '',
307 $f1_nullable ? '' : ' NOT NULL',
308 !defined $f1_default ? ''
309 : uc $f1_default eq 'NULL' ? ' DEFAULT NULL'
310 : uc $f1_default eq 'CURRENT_TIMESTAMP' ? ' DEFAULT CURRENT_TIMESTAMP'
311 : " DEFAULT '$f1_default'",
312 $f1_auto_inc ? ' AUTO_INCREMENT' : '',
317 push @diffs_table_changes, sprintf( "ALTER TABLE %s %s %s%s %s%s%s%s%s;",
318 $t1_name, $target_db =~ /SQLServer/ ? "ALTER COLUMN" : "CHANGE",
319 $f1_name, $target_db =~ /MySQL/ ? " $f1_name" : '',
320 $f1_type, ($f1_size && $f1_type !~ /(blob|text)$/) ? "($f1_size)" : '',
321 $f1_nullable ? '' : ' NOT NULL',
322 !defined $f1_default || $target_db =~ /SQLServer/ ? ''
323 : uc $f1_default eq 'NULL' ? ' DEFAULT NULL'
324 : uc $f1_default eq 'CURRENT_TIMESTAMP' ? ' DEFAULT CURRENT_TIMESTAMP'
325 : " DEFAULT '$f1_default'",
326 $f1_auto_inc ? ' AUTO_INCREMENT' : '',
328 if ( defined $f1_default && $target_db =~ /SQLServer/ ) {
329 # Adding a column with a default value for SQL Server means adding a
330 # constraint and setting existing NULLs to the default value
331 push @diffs_table_changes, sprintf( "ALTER TABLE %s ADD CONSTRAINT DF_%s_%s %s FOR %s;",
332 $t1_name, $t1_name, $f1_name, uc $f1_default eq 'NULL' ? 'DEFAULT NULL'
333 : uc $f1_default eq 'CURRENT_TIMESTAMP' ? 'DEFAULT CURRENT_TIMESTAMP'
334 : "DEFAULT '$f1_default'", $f1_name,
336 push @diffs_table_changes, sprintf( "UPDATE %s SET %s = %s WHERE %s IS NULL;",
337 $t1_name, $f1_name, uc $f1_default eq 'NULL' ? 'NULL'
338 : uc $f1_default eq 'CURRENT_TIMESTAMP' ? 'CURRENT_TIMESTAMP'
339 : "'$f1_default'", $f1_name,
345 my(%checked_indices, @diffs_index_creates, @diffs_index_drops);
347 for my $i1 ( $t1->get_indices ) {
348 for my $i2 ( $t2->get_indices ) {
349 if ( $i1->equals($i2, $case_insensitive) ) {
350 $checked_indices{$i2} = 1;
354 push @diffs_index_creates, sprintf(
355 "CREATE %sINDEX%s ON %s (%s);",
356 $i1->type eq NORMAL ? '' : $i1->type." ",
357 $i1->name ? " ".$i1->name : '',
359 join(",", $i1->fields),
363 for my $i2 ( $t2->get_indices ) {
364 next if $checked_indices{$i2};
365 for my $i1 ( $t1->get_indices ) {
366 next INDEX2 if $i2->equals($i1, $case_insensitive);
368 $target_db =~ /SQLServer/
369 ? push @diffs_index_drops, "DROP INDEX $t1_name.".$i2->name.";"
370 : push @diffs_index_drops, "DROP INDEX ".$i2->name." on $t1_name;";
373 my(%checked_constraints, @diffs_constraint_adds, @diffs_constraint_drops);
375 for my $c1 ( $t1->get_constraints ) {
376 for my $c2 ( $t2->get_constraints ) {
377 if ( $c1->equals($c2, $case_insensitive) ) {
378 $checked_constraints{$c2} = 1;
382 push @diffs_constraint_adds, "ALTER TABLE $t1_name ADD ".
383 constraint_to_string($c1, $source_schema).";";
386 for my $c2 ( $t2->get_constraints ) {
387 next if $checked_constraints{$c2};
388 for my $c1 ( $t1->get_constraints ) {
389 next CONSTRAINT2 if $c2->equals($c1, $case_insensitive);
391 if ( $c2->type eq UNIQUE ) {
392 push @diffs_constraint_drops, "ALTER TABLE $t1_name DROP INDEX ".
394 } elsif ( $target_db =~ /SQLServer/ ) {
395 push @diffs_constraint_drops, "ALTER TABLE $t1_name DROP ".$c2->name.";";
397 push @diffs_constraint_drops, "ALTER TABLE $t1_name DROP ".$c2->type.
398 ($c2->type eq FOREIGN_KEY ? " ".$c2->name : '').";";
402 push @diffs, @diffs_index_drops, @diffs_constraint_drops,
403 @diffs_table_options, @diffs_table_adds, @diffs_table_changes,
404 @diffs_constraint_adds, @diffs_index_creates;
407 for my $t2 ( $target_schema->get_tables ) {
408 my $t2_name = $t2->name;
409 my $t1 = $source_schema->get_table( $t2_name, $target_db =~ /SQLServer/ );
412 if ( $target_db =~ /SQLServer/ ) {
413 for my $constraint ( $t2->get_constraints ) {
414 next if $constraint->type eq PRIMARY_KEY;
415 push @diffs, "ALTER TABLE $t2_name DROP ".$constraint->name.";";
418 push @diffs_at_end, "DROP TABLE $t2_name;";
422 for my $t2_field ( $t2->get_fields ) {
423 my $f2_name = $t2_field->name;
424 my $t1_field = $t1->get_field( $f2_name );
425 unless ( $t1_field ) {
426 my $modifier = $target_db =~ /SQLServer/ ? "COLUMN " : '';
427 push @diffs, "ALTER TABLE $t2_name DROP $modifier$f2_name;";
433 my $dummy_tr = SQL::Translator->new;
434 $dummy_tr->schema->add_table( $_ ) for @new_tables;
435 my $producer = $dummy_tr->producer( $target_db );
436 unshift @diffs, $producer->( $dummy_tr );
438 push(@diffs, @diffs_at_end);
442 "-- Convert schema '$s2_name' to '$s1_name':\n", @diffs, ''
446 print "There were no differences.\n";
449 sub constraint_to_string {
451 my $schema = shift or die "No schema given";
452 my @fields = $c->fields or return '';
454 if ( $c->type eq PRIMARY_KEY ) {
455 return 'PRIMARY KEY (' . join(', ', @fields). ')';
457 elsif ( $c->type eq UNIQUE ) {
459 (defined $c->name ? $c->name.' ' : '').
460 '(' . join(', ', @fields). ')';
462 elsif ( $c->type eq FOREIGN_KEY ) {
464 map { $_ || () } 'CONSTRAINT', $c->name, 'FOREIGN KEY'
467 $def .= ' (' . join( ', ', @fields ) . ')';
469 $def .= ' REFERENCES ' . $c->reference_table;
471 my @rfields = map { $_ || () } $c->reference_fields;
472 unless ( @rfields ) {
473 my $rtable_name = $c->reference_table;
474 if ( my $ref_table = $schema->get_table( $rtable_name ) ) {
475 push @rfields, $ref_table->primary_key;
478 warn "Can't find reference table '$rtable_name' " .
484 $def .= ' (' . join( ', ', @rfields ) . ')';
487 warn "FK constraint on " . 'some table' . '.' .
488 join('', @fields) . " has no reference fields\n";
491 if ( $c->match_type ) {
493 ( $c->match_type =~ /full/i ) ? 'FULL' : 'PARTIAL';
496 if ( $c->on_delete ) {
497 $def .= ' ON DELETE '.join( ' ', $c->on_delete );
500 if ( $c->on_update ) {
501 $def .= ' ON UPDATE '.join( ' ', $c->on_update );
508 # -------------------------------------------------------------------
509 # Bring out number weight & measure in a year of dearth.
511 # -------------------------------------------------------------------
517 Ken Y. Clark E<lt>kclark@cpan.orgE<gt>.
521 SQL::Translator, L<http://sqlfairy.sourceforge.net>.