/usr/share/perl5/SQL/Translator/Producer/SQLite.pm is in libsql-translator-perl 0.11024-1.
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=head1 NAME
SQL::Translator::Producer::SQLite - SQLite producer for SQL::Translator
=head1 SYNOPSIS
use SQL::Translator;
my $t = SQL::Translator->new( parser => '...', producer => 'SQLite' );
$t->translate;
=head1 DESCRIPTION
This module will produce text output of the schema suitable for SQLite.
=cut
use strict;
use warnings;
use Data::Dumper;
use SQL::Translator::Schema::Constants;
use SQL::Translator::Utils qw(debug header_comment parse_dbms_version batch_alter_table_statements);
use SQL::Translator::Generator::DDL::SQLite;
our ( $DEBUG, $WARN );
our $VERSION = '1.59';
$DEBUG = 0 unless defined $DEBUG;
$WARN = 0 unless defined $WARN;
our $max_id_length = 30;
my %global_names;
# HIDEOUS TEMPORARY DEFAULT WITHOUT QUOTING!
our $NO_QUOTES = 1;
{
my ($quoting_generator, $nonquoting_generator);
sub _generator {
$NO_QUOTES
? $nonquoting_generator ||= SQL::Translator::Generator::DDL::SQLite->new(quote_chars => [])
: $quoting_generator ||= SQL::Translator::Generator::DDL::SQLite->new
}
}
sub produce {
my $translator = shift;
local $DEBUG = $translator->debug;
local $WARN = $translator->show_warnings;
my $no_comments = $translator->no_comments;
my $add_drop_table = $translator->add_drop_table;
my $schema = $translator->schema;
my $producer_args = $translator->producer_args;
my $sqlite_version = parse_dbms_version(
$producer_args->{sqlite_version}, 'perl'
);
my $no_txn = $producer_args->{no_transaction};
debug("PKG: Beginning production\n");
%global_names = (); #reset
# only quote if quotes were requested for real
# 0E0 indicates "the default of true" was assumed
local $NO_QUOTES = 0
if $translator->quote_identifiers and $translator->quote_identifiers ne '0E0';
my $head = (header_comment() . "\n") unless $no_comments;
my @create = ();
push @create, "BEGIN TRANSACTION" unless $no_txn;
for my $table ( $schema->get_tables ) {
push @create, create_table($table, { no_comments => $no_comments,
sqlite_version => $sqlite_version,
add_drop_table => $add_drop_table,});
}
for my $view ( $schema->get_views ) {
push @create, create_view($view, {
add_drop_view => $add_drop_table,
no_comments => $no_comments,
});
}
for my $trigger ( $schema->get_triggers ) {
push @create, create_trigger($trigger, {
add_drop_trigger => $add_drop_table,
no_comments => $no_comments,
});
}
push @create, "COMMIT" unless $no_txn;
if (wantarray) {
return ($head||(), @create);
} else {
return join ('',
$head||(),
join(";\n\n", @create ),
";\n",
);
}
}
sub mk_name {
my ($name, $scope, $critical) = @_;
$scope ||= \%global_names;
if ( my $prev = $scope->{ $name } ) {
my $name_orig = $name;
$name .= sprintf( "%02d", ++$prev );
substr($name, $max_id_length - 3) = "00"
if length( $name ) > $max_id_length;
warn "The name '$name_orig' has been changed to ",
"'$name' to make it unique.\n" if $WARN;
$scope->{ $name_orig }++;
}
$scope->{ $name }++;
return _generator()->quote($name);
}
sub create_view {
my ($view, $options) = @_;
my $add_drop_view = $options->{add_drop_view};
my $view_name = _generator()->quote($view->name);
$global_names{$view->name} = 1;
debug("PKG: Looking at view '${view_name}'\n");
# Header. Should this look like what mysqldump produces?
my $extra = $view->extra;
my @create;
push @create, "DROP VIEW IF EXISTS $view_name" if $add_drop_view;
my $create_view = 'CREATE';
$create_view .= " TEMPORARY" if exists($extra->{temporary}) && $extra->{temporary};
$create_view .= ' VIEW';
$create_view .= " IF NOT EXISTS" if exists($extra->{if_not_exists}) && $extra->{if_not_exists};
$create_view .= " ${view_name}";
if( my $sql = $view->sql ){
$create_view .= " AS\n ${sql}";
}
push @create, $create_view;
# Tack the comment onto the first statement.
unless ($options->{no_comments}) {
$create[0] = "--\n-- View: ${view_name}\n--\n" . $create[0];
}
return @create;
}
sub create_table
{
my ($table, $options) = @_;
my $table_name = _generator()->quote($table->name);
$global_names{$table->name} = 1;
my $no_comments = $options->{no_comments};
my $add_drop_table = $options->{add_drop_table};
my $sqlite_version = $options->{sqlite_version} || 0;
debug("PKG: Looking at table '$table_name'\n");
my ( @index_defs, @constraint_defs );
my @fields = $table->get_fields or die "No fields in $table_name";
my $temp = $options->{temporary_table} ? 'TEMPORARY ' : '';
#
# Header.
#
my $exists = ($sqlite_version >= 3.003) ? ' IF EXISTS' : '';
my @create;
my ($comment, $create_table) = "";
$comment = "--\n-- Table: $table_name\n--\n" unless $no_comments;
if ($add_drop_table) {
push @create, $comment . qq[DROP TABLE$exists $table_name];
} else {
$create_table = $comment;
}
$create_table .= "CREATE ${temp}TABLE $table_name (\n";
#
# Comments
#
if ( $table->comments and !$no_comments ){
$create_table .= "-- Comments: \n-- ";
$create_table .= join "\n-- ", $table->comments;
$create_table .= "\n--\n\n";
}
#
# How many fields in PK?
#
my $pk = $table->primary_key;
my @pk_fields = $pk ? $pk->fields : ();
#
# Fields
#
my ( @field_defs, $pk_set );
for my $field ( @fields ) {
push @field_defs, create_field($field);
}
if (
scalar @pk_fields > 1
||
( @pk_fields && !grep /INTEGER PRIMARY KEY/, @field_defs )
) {
push @field_defs, 'PRIMARY KEY (' . join(', ', map _generator()->quote($_), @pk_fields ) . ')';
}
#
# Indices
#
for my $index ( $table->get_indices ) {
push @index_defs, create_index($index);
}
#
# Constraints
#
for my $c ( $table->get_constraints ) {
if ($c->type eq "FOREIGN KEY") {
push @field_defs, create_foreignkey($c);
}
elsif ($c->type eq "CHECK") {
push @field_defs, create_check_constraint($c);
}
next unless $c->type eq UNIQUE;
push @constraint_defs, create_constraint($c);
}
$create_table .= join(",\n", map { " $_" } @field_defs ) . "\n)";
return (@create, $create_table, @index_defs, @constraint_defs );
}
sub create_check_constraint {
my $c = shift;
my $check = '';
$check .= 'CONSTRAINT ' . _generator->quote( $c->name ) . ' ' if $c->name;
$check .= 'CHECK(' . $c->expression . ')';
return $check;
}
sub create_foreignkey {
my $c = shift;
my @fields = $c->fields;
my @rfields = map { $_ || () } $c->reference_fields;
unless ( @rfields ) {
my $rtable_name = $c->reference_table;
if ( my $ref_table = $c->schema->get_table( $rtable_name ) ) {
push @rfields, $ref_table->primary_key;
die "FK constraint on " . $rtable_name . '.' . join('', @fields) . " has no reference fields\n"
unless @rfields;
}
else {
die "Can't find reference table '$rtable_name' in schema\n";
}
}
my $fk_sql = sprintf 'FOREIGN KEY (%s) REFERENCES %s(%s)',
join (', ', map { _generator()->quote($_) } @fields ),
_generator()->quote($c->reference_table),
join (', ', map { _generator()->quote($_) } @rfields )
;
$fk_sql .= " ON DELETE " . $c->{on_delete} if $c->{on_delete};
$fk_sql .= " ON UPDATE " . $c->{on_update} if $c->{on_update};
return $fk_sql;
}
sub create_field { return _generator()->field($_[0]) }
sub create_index
{
my ($index, $options) = @_;
(my $index_table_name = $index->table->name) =~ s/^.+?\.//; # table name may not specify schema
my $name = mk_name($index->name || "${index_table_name}_idx");
my $type = $index->type eq 'UNIQUE' ? "UNIQUE " : '';
# strip any field size qualifiers as SQLite doesn't like these
my @fields = map { s/\(\d+\)$//; _generator()->quote($_) } $index->fields;
$index_table_name = _generator()->quote($index_table_name);
warn "removing schema name from '" . $index->table->name . "' to make '$index_table_name'\n" if $WARN;
my $index_def =
"CREATE ${type}INDEX $name ON " . $index_table_name .
' (' . join( ', ', @fields ) . ')';
return $index_def;
}
sub create_constraint
{
my ($c, $options) = @_;
(my $index_table_name = $c->table->name) =~ s/^.+?\.//; # table name may not specify schema
my $name = mk_name($c->name || "${index_table_name}_idx");
my @fields = map _generator()->quote($_), $c->fields;
$index_table_name = _generator()->quote($index_table_name);
warn "removing schema name from '" . $c->table->name . "' to make '$index_table_name'\n" if $WARN;
my $c_def =
"CREATE UNIQUE INDEX $name ON " . $index_table_name .
' (' . join( ', ', @fields ) . ')';
return $c_def;
}
sub create_trigger {
my ($trigger, $options) = @_;
my $add_drop = $options->{add_drop_trigger};
my @statements;
my $trigger_name = $trigger->name;
$global_names{$trigger_name} = 1;
my $events = $trigger->database_events;
for my $evt ( @$events ) {
my $trig_name = $trigger_name;
if (@$events > 1) {
$trig_name .= "_$evt";
warn "Multiple database events supplied for trigger '$trigger_name', ",
"creating trigger '$trig_name' for the '$evt' event.\n" if $WARN;
}
$trig_name = _generator()->quote($trig_name);
push @statements, "DROP TRIGGER IF EXISTS $trig_name" if $add_drop;
$DB::single = 1;
my $action = "";
if (not ref $trigger->action) {
$action = $trigger->action;
$action = "BEGIN " . $action . " END"
unless $action =~ /^ \s* BEGIN [\s\;] .*? [\s\;] END [\s\;]* $/six;
}
else {
$action = $trigger->action->{for_each} . " "
if $trigger->action->{for_each};
$action = $trigger->action->{when} . " "
if $trigger->action->{when};
my $steps = $trigger->action->{steps} || [];
$action .= "BEGIN ";
$action .= $_ . "; " for (@$steps);
$action .= "END";
}
push @statements, sprintf (
'CREATE TRIGGER %s %s %s on %s %s',
$trig_name,
$trigger->perform_action_when,
$evt,
_generator()->quote($trigger->on_table),
$action
);
}
return @statements;
}
sub alter_table { () } # Noop
sub add_field {
my ($field) = @_;
return sprintf("ALTER TABLE %s ADD COLUMN %s",
_generator()->quote($field->table->name), create_field($field))
}
sub alter_create_index {
my ($index) = @_;
# This might cause name collisions
return create_index($index);
}
sub alter_create_constraint {
my ($constraint) = @_;
return create_constraint($constraint) if $constraint->type eq 'UNIQUE';
}
sub alter_drop_constraint { alter_drop_index(@_) }
sub alter_drop_index {
my ($constraint) = @_;
return sprintf("DROP INDEX %s",
_generator()->quote($constraint->name));
}
sub batch_alter_table {
my ($table, $diffs, $options) = @_;
# If we have any of the following
#
# rename_field
# alter_field
# drop_field
#
# we need to do the following <http://www.sqlite.org/faq.html#q11>
#
# BEGIN TRANSACTION;
# CREATE TEMPORARY TABLE t1_backup(a,b);
# INSERT INTO t1_backup SELECT a,b FROM t1;
# DROP TABLE t1;
# CREATE TABLE t1(a,b);
# INSERT INTO t1 SELECT a,b FROM t1_backup;
# DROP TABLE t1_backup;
# COMMIT;
#
# Fun, eh?
#
# If we have rename_field we do similarly.
#
# We create the temporary table as a copy of the new table, copy all data
# to temp table, create new table and then copy as appropriate taking note
# of renamed fields.
my $table_name = $table->name;
if ( @{$diffs->{rename_field}} == 0 &&
@{$diffs->{alter_field}} == 0 &&
@{$diffs->{drop_field}} == 0
) {
return batch_alter_table_statements($diffs, $options);
}
my @sql;
# $table is the new table but we may need an old one
# TODO: this is NOT very well tested at the moment so add more tests
my $old_table = $table;
if ( $diffs->{rename_table} && @{$diffs->{rename_table}} ) {
$old_table = $diffs->{rename_table}[0][0];
}
my $temp_table_name = $table_name . '_temp_alter';
# CREATE TEMPORARY TABLE t1_backup(a,b);
my %temp_table_fields;
do {
local $table->{name} = $temp_table_name;
# We only want the table - don't care about indexes on tmp table
my ($table_sql) = create_table($table, {no_comments => 1, temporary_table => 1});
push @sql,$table_sql;
%temp_table_fields = map { $_ => 1} $table->get_fields;
};
# record renamed fields for later
my %rename_field = map { $_->[1]->name => $_->[0]->name } @{$diffs->{rename_field}};
# drop added fields from %temp_table_fields
delete @temp_table_fields{@{$diffs->{add_field}}};
# INSERT INTO t1_backup SELECT a,b FROM t1;
push @sql, sprintf( 'INSERT INTO %s( %s) SELECT %s FROM %s',
_generator()->quote( $temp_table_name ),
join( ', ',
map _generator()->quote($_),
grep { $temp_table_fields{$_} } $table->get_fields ),
join( ', ',
map _generator()->quote($_),
map { $rename_field{$_} ? $rename_field{$_} : $_ }
grep { $temp_table_fields{$_} } $table->get_fields ),
_generator()->quote( $old_table->name )
);
# DROP TABLE t1;
push @sql, sprintf('DROP TABLE %s', _generator()->quote($old_table->name));
# CREATE TABLE t1(a,b);
push @sql, create_table($table, { no_comments => 1 });
# INSERT INTO t1 SELECT a,b FROM t1_backup;
push @sql, sprintf('INSERT INTO %s SELECT %s FROM %s',
_generator()->quote($table_name),
join(', ', map _generator()->quote($_), $table->get_fields),
_generator()->quote($temp_table_name)
);
# DROP TABLE t1_backup;
push @sql, sprintf('DROP TABLE %s', _generator()->quote($temp_table_name));
return wantarray ? @sql : join(";\n", @sql);
}
sub drop_table {
my ($table) = @_;
$table = _generator()->quote($table);
return "DROP TABLE $table";
}
sub rename_table {
my ($old_table, $new_table, $options) = @_;
$old_table = _generator()->quote($old_table);
$new_table = _generator()->quote($new_table);
return "ALTER TABLE $old_table RENAME TO $new_table";
}
# No-op. Just here to signify that we are a new style parser.
sub preproces_schema { }
1;
=pod
=head1 SEE ALSO
SQL::Translator, http://www.sqlite.org/.
=head1 AUTHOR
Ken Youens-Clark C<< <kclark@cpan.orgE> >>.
Diff code added by Ash Berlin C<< <ash@cpan.org> >>.
=cut
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