[dbsrgits/SQL-Translator.git] / lib / SQL / Translator / Producer / SQLite.pm

package SQL::Translator::Producer::SQLite;

=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);
use SQL::Translator::ProducerUtils;
my $util = SQL::Translator::ProducerUtils->new( quote_chars => q(') );

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;

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


    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 $util->quote($name);
}

sub create_view {
    my ($view, $options) = @_;
    my $add_drop_view = $options->{add_drop_view};

    my $view_name = $util->quote($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 = $util->quote($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 $util->quote($_), @pk_fields ) . ')';
    }

    #
    # Indices
    #
    my $idx_name_default = 'A';
    for my $index ( $table->get_indices ) {
        push @index_defs, create_index($index);
    }

    #
    # Constraints
    #
    my $c_name_default = 'A';
    for my $c ( $table->get_constraints ) {
        if ($c->type eq "FOREIGN KEY") {
            push @field_defs, create_foreignkey($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_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 { $util->quote($_) } @fields ),
        $util->quote($c->reference_table),
        join (', ', map { $util->quote($_) } @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
{
    my ($field, $options) = @_;

    my $field_name = $util->quote($field->name);
    debug("PKG: Looking at field '$field_name'\n");
    my $field_comments = $field->comments
        ? "-- " . $field->comments . "\n  "
        : '';

    my $field_def = $field_comments.$field_name;

    # data type and size
    my $size      = $field->size;
    my $data_type = $field->data_type;
    $data_type    = 'varchar' if lc $data_type eq 'set';
    $data_type  = 'blob' if lc $data_type eq 'bytea';

    if ( lc $data_type =~ /(text|blob)/i ) {
        $size = undef;
    }

#             if ( $data_type =~ /timestamp/i ) {
#                 push @trigger_defs,
#                     "CREATE TRIGGER ts_${table_name} ".
#                     "after insert on $table_name\n".
#                     "begin\n".
#                     "  update $table_name set $field_name=timestamp() ".
#                        "where id=new.id;\n".
#                     "end;\n"
#                 ;
#
#            }

    #
    # SQLite is generally typeless, but newer versions will
    # make a field autoincrement if it is declared as (and
    # *only* as) INTEGER PRIMARY KEY
    #
    my $pk        = $field->table->primary_key;
    my @pk_fields = $pk ? $pk->fields : ();

    if (
         $field->is_primary_key &&
         scalar @pk_fields == 1 &&
         (
          $data_type =~ /int(eger)?$/i
          ||
          ( $data_type =~ /^number?$/i && $size !~ /,/ )
          )
         ) {
        $data_type = 'INTEGER PRIMARY KEY';
        $size      = undef;
#        $pk_set    = 1;
    }

    $field_def .= sprintf " %s%s", $data_type,
    ( !$field->is_auto_increment && $size ) ? "($size)" : '';

    # Null?
    $field_def .= ' NOT NULL' unless $field->is_nullable;

    # Default?
    SQL::Translator::Producer->_apply_default_value(
        $field,
        \$field_def,
        [
         'NULL'              => \'NULL',
         'now()'             => 'now()',
         'CURRENT_TIMESTAMP' => 'CURRENT_TIMESTAMP',
        ],
    );

    return $field_def;

}

sub create_index
{
    my ($index, $options) = @_;

    my $name   = $index->name;
    $name      = mk_name($name);

    my $type   = $index->type eq 'UNIQUE' ? "UNIQUE " : '';

    # strip any field size qualifiers as SQLite doesn't like these
    my @fields = map { s/\(\d+\)$//; $util->quote($_) } $index->fields;
    (my $index_table_name = $index->table->name) =~ s/^.+?\.//; # table name may not specify schema
    $index_table_name = $util->quote($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 $name   = $c->name;
    $name      = mk_name($name);
    my @fields = map $util->quote($_), $c->fields;
    (my $index_table_name = $c->table->name) =~ s/^.+?\.//; # table name may not specify schema
    $index_table_name = $util->quote($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 = $util->quote($trig_name);
    push @statements,  "DROP TRIGGER IF EXISTS $trig_name" if $add_drop;


    $DB::single = 1;
    my $action = "";
    if (not ref $trigger->action) {
      $action .= "BEGIN " . $trigger->action . " END";
    }
    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,
      $util->quote($trigger->on_table),
      $action
    );
  }

  return @statements;
}

sub alter_table { } # Noop

sub add_field {
  my ($field) = @_;

  return sprintf("ALTER TABLE %s ADD COLUMN %s",
      $util->quote($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",
      $util->quote($constraint->name));
}

sub batch_alter_table {
  my ($table, $diffs) = @_;

  # 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.

  my $table_name = $table->name;
  my $renaming = $diffs->{rename_table} && @{$diffs->{rename_table}};

  if ( @{$diffs->{rename_field}} == 0 &&
       @{$diffs->{alter_field}}  == 0 &&
       @{$diffs->{drop_field}}   == 0
       ) {
#    return join("\n", map {
    return map {
        my $meth = __PACKAGE__->can($_) or die __PACKAGE__ . " cant $_";
        map { my $sql = $meth->(ref $_ eq 'ARRAY' ? @$_ : $_); $sql ?  ("$sql") : () } @{ $diffs->{$_} }

      } grep { @{$diffs->{$_}} }
    qw/rename_table
       alter_drop_constraint
       alter_drop_index
       drop_field
       add_field
       alter_field
       rename_field
       alter_create_index
       alter_create_constraint
       alter_table/;
  }


  my @sql;
  my $old_table = $renaming ? $diffs->{rename_table}[0][0] : $table;

  do {
    local $table->{name} = $table_name . '_temp_alter';
    # We only want the table - dont care about indexes on tmp table
    my ($table_sql) = create_table($table, {no_comments => 1, temporary_table => 1});
    push @sql,$table_sql;
  };

  push @sql, "INSERT INTO @{[$util->quote($table_name.'_temp_alter')]} SELECT @{[ join(', ', map $util->quote($_), $old_table->get_fields)]} FROM @{[$util->quote($old_table)]}",
             "DROP TABLE @{[$util->quote($old_table)]}",
             create_table($table, { no_comments => 1 }),
             "INSERT INTO @{[$util->quote($table_name)]} SELECT @{[ join(', ', map $util->quote($_), $old_table->get_fields)]} FROM @{[$util->quote($table_name.'_temp_alter')]}",
             "DROP TABLE @{[$util->quote($table_name.'_temp_alter')]}";

  return @sql;
#  return join("", @sql, "");
}

sub drop_table {
  my ($table) = @_;
  $table = $util->quote($table);
  return "DROP TABLE $table";
}

sub rename_table {
  my ($old_table, $new_table, $options) = @_;

  $old_table = $util->quote($old_table);
  $new_table = $util->quote($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
Commit	Line	Data
758ab1cd	1	package SQL::Translator::Producer::SQLite;
758ab1cd	2
20770e44	3	=head1 NAME
	4
	5	SQL::Translator::Producer::SQLite - SQLite producer for SQL::Translator
	6
	7	=head1 SYNOPSIS
	8
	9	use SQL::Translator;
	10
	11	my $t = SQL::Translator->new( parser => '...', producer => 'SQLite' );
	12	$t->translate;
	13
	14	=head1 DESCRIPTION
	15
	16	This module will produce text output of the schema suitable for SQLite.
	17
	18	=cut
	19
758ab1cd	20	use strict;
d0fcb05d	21	use warnings;
758ab1cd	22	use Data::Dumper;
b21bf652	23	use SQL::Translator::Schema::Constants;
7b4b17aa	24	use SQL::Translator::Utils qw(debug header_comment parse_dbms_version);
d8cf2279	25	use SQL::Translator::ProducerUtils;
d8cf2279	26	my $util = SQL::Translator::ProducerUtils->new( quote_chars => q(') );
758ab1cd	27
0c04c5a2	28	our ( $DEBUG, $WARN );
0c04c5a2	29	our $VERSION = '1.59';
11ad2df9	30	$DEBUG = 0 unless defined $DEBUG;
11ad2df9	31	$WARN = 0 unless defined $WARN;
758ab1cd	32
11ad2df9	33	our $max_id_length = 30;
ae602737	34	my %global_names;
758ab1cd	35
758ab1cd	36	sub produce {
a1d94525	37	my $translator = shift;
	38	local $DEBUG = $translator->debug;
	39	local $WARN = $translator->show_warnings;
	40	my $no_comments = $translator->no_comments;
	41	my $add_drop_table = $translator->add_drop_table;
	42	my $schema = $translator->schema;
d12f72ff	43	my $producer_args = $translator->producer_args;
7b4b17aa	44	my $sqlite_version = parse_dbms_version(
	45	$producer_args->{sqlite_version}, 'perl'
	46	);
f9c96971	47	my $no_txn = $producer_args->{no_transaction};
758ab1cd	48
1a24938d	49	debug("PKG: Beginning production\n");
758ab1cd	50
ae602737	51	%global_names = (); #reset
ae602737	52
b6b0696f	53
	54	my $head = (header_comment() . "\n") unless $no_comments;
	55
24d9fe69	56	my @create = ();
b6b0696f	57
b6b0696f	58	push @create, "BEGIN TRANSACTION" unless $no_txn;
758ab1cd	59
b21bf652	60	for my $table ( $schema->get_tables ) {
24d9fe69	61	push @create, create_table($table, { no_comments => $no_comments,
d12f72ff	62	sqlite_version => $sqlite_version,
4d438549	63	add_drop_table => $add_drop_table,});
a5a882f0	64	}
a5a882f0	65
ec59a597	66	for my $view ( $schema->get_views ) {
24d9fe69	67	push @create, create_view($view, {
a25ac5d2	68	add_drop_view => $add_drop_table,
	69	no_comments => $no_comments,
	70	});
ec59a597	71	}
ec59a597	72
d0fcb05d	73	for my $trigger ( $schema->get_triggers ) {
	74	push @create, create_trigger($trigger, {
	75	add_drop_trigger => $add_drop_table,
	76	no_comments => $no_comments,
	77	});
	78	}
	79
b6b0696f	80	push @create, "COMMIT" unless $no_txn;
b6b0696f	81
f9c96971	82	if (wantarray) {
b6b0696f	83	return ($head\|\|(), @create);
f9c96971	84	} else {
b6b0696f	85	return join ('',
	86	$head\|\|(),
	87	join(";\n\n", @create ),
	88	";\n",
	89	);
f9c96971	90	}
758ab1cd	91	}
758ab1cd	92
758ab1cd	93	sub mk_name {
ae602737	94	my ($name, $scope, $critical) = @_;
758ab1cd	95
	96	$scope \|\|= \%global_names;
	97	if ( my $prev = $scope->{ $name } ) {
	98	my $name_orig = $name;
	99	$name .= sprintf( "%02d", ++$prev );
ea93df61	100	substr($name, $max_id_length - 3) = "00"
11ad2df9	101	if length( $name ) > $max_id_length;
758ab1cd	102
	103	warn "The name '$name_orig' has been changed to ",
	104	"'$name' to make it unique.\n" if $WARN;
	105
	106	$scope->{ $name_orig }++;
	107	}
	108
	109	$scope->{ $name }++;
d8cf2279	110	return $util->quote($name);
758ab1cd	111	}
758ab1cd	112
ec59a597	113	sub create_view {
ec59a597	114	my ($view, $options) = @_;
a25ac5d2	115	my $add_drop_view = $options->{add_drop_view};
ec59a597	116
d8cf2279	117	my $view_name = $util->quote($view->name);
d8cf2279	118	$global_names{$view->name} = 1;
56785c01	119
ec59a597	120	debug("PKG: Looking at view '${view_name}'\n");
	121
	122	# Header. Should this look like what mysqldump produces?
	123	my $extra = $view->extra;
4c0d31c1	124	my @create;
	125	push @create, "DROP VIEW IF EXISTS $view_name" if $add_drop_view;
	126
	127	my $create_view = 'CREATE';
	128	$create_view .= " TEMPORARY" if exists($extra->{temporary}) && $extra->{temporary};
	129	$create_view .= ' VIEW';
	130	$create_view .= " IF NOT EXISTS" if exists($extra->{if_not_exists}) && $extra->{if_not_exists};
	131	$create_view .= " ${view_name}";
ec59a597	132
ec59a597	133	if( my $sql = $view->sql ){
4c0d31c1	134	$create_view .= " AS\n ${sql}";
ec59a597	135	}
4c0d31c1	136	push @create, $create_view;
	137
	138	# Tack the comment onto the first statement.
	139	unless ($options->{no_comments}) {
	140	$create[0] = "--\n-- View: ${view_name}\n--\n" . $create[0];
	141	}
	142
	143	return @create;
ec59a597	144	}
	145
	146
bfb5a568	147	sub create_table
	148	{
	149	my ($table, $options) = @_;
758ab1cd	150
d8cf2279	151	my $table_name = $util->quote($table->name);
d8cf2279	152	$global_names{$table->name} = 1;
56785c01	153
bfb5a568	154	my $no_comments = $options->{no_comments};
bfb5a568	155	my $add_drop_table = $options->{add_drop_table};
3db73ef8	156	my $sqlite_version = $options->{sqlite_version} \|\| 0;
bfb5a568	157
	158	debug("PKG: Looking at table '$table_name'\n");
	159
d0fcb05d	160	my ( @index_defs, @constraint_defs );
bfb5a568	161	my @fields = $table->get_fields or die "No fields in $table_name";
bfb5a568	162
4d438549	163	my $temp = $options->{temporary_table} ? 'TEMPORARY ' : '';
bfb5a568	164	#
	165	# Header.
	166	#
7b4b17aa	167	my $exists = ($sqlite_version >= 3.003) ? ' IF EXISTS' : '';
24d9fe69	168	my @create;
d0fcb05d	169	my ($comment, $create_table) = "";
	170	$comment = "--\n-- Table: $table_name\n--\n" unless $no_comments;
	171	if ($add_drop_table) {
	172	push @create, $comment . qq[DROP TABLE$exists $table_name];
	173	} else {
	174	$create_table = $comment;
	175	}
	176
	177	$create_table .= "CREATE ${temp}TABLE $table_name (\n";
bfb5a568	178
	179	#
	180	# Comments
	181	#
	182	if ( $table->comments and !$no_comments ){
24d9fe69	183	$create_table .= "-- Comments: \n-- ";
	184	$create_table .= join "\n-- ", $table->comments;
	185	$create_table .= "\n--\n\n";
bfb5a568	186	}
	187
	188	#
	189	# How many fields in PK?
	190	#
	191	my $pk = $table->primary_key;
	192	my @pk_fields = $pk ? $pk->fields : ();
	193
	194	#
	195	# Fields
	196	#
	197	my ( @field_defs, $pk_set );
	198	for my $field ( @fields ) {
	199	push @field_defs, create_field($field);
	200	}
	201
ea93df61	202	if (
	203	scalar @pk_fields > 1
	204	\|\|
	205	( @pk_fields && !grep /INTEGER PRIMARY KEY/, @field_defs )
bfb5a568	206	) {
d8cf2279	207	push @field_defs, 'PRIMARY KEY (' . join(', ', map $util->quote($_), @pk_fields ) . ')';
bfb5a568	208	}
	209
	210	#
	211	# Indices
	212	#
	213	my $idx_name_default = 'A';
	214	for my $index ( $table->get_indices ) {
	215	push @index_defs, create_index($index);
	216	}
	217
	218	#
	219	# Constraints
	220	#
	221	my $c_name_default = 'A';
	222	for my $c ( $table->get_constraints ) {
0dbd2362	223	if ($c->type eq "FOREIGN KEY") {
	224	push @field_defs, create_foreignkey($c);
	225	}
ea93df61	226	next unless $c->type eq UNIQUE;
bfb5a568	227	push @constraint_defs, create_constraint($c);
	228	}
	229
24d9fe69	230	$create_table .= join(",\n", map { " $_" } @field_defs ) . "\n)";
bfb5a568	231
d0fcb05d	232	return (@create, $create_table, @index_defs, @constraint_defs );
bfb5a568	233	}
bfb5a568	234
0dbd2362	235	sub create_foreignkey {
	236	my $c = shift;
	237
ea4a3ecc	238	my @fields = $c->fields;
	239	my @rfields = map { $_ \|\| () } $c->reference_fields;
	240	unless ( @rfields ) {
	241	my $rtable_name = $c->reference_table;
	242	if ( my $ref_table = $c->schema->get_table( $rtable_name ) ) {
	243	push @rfields, $ref_table->primary_key;
	244
	245	die "FK constraint on " . $rtable_name . '.' . join('', @fields) . " has no reference fields\n"
	246	unless @rfields;
	247	}
	248	else {
	249	die "Can't find reference table '$rtable_name' in schema\n";
	250	}
	251	}
	252
	253	my $fk_sql = sprintf 'FOREIGN KEY (%s) REFERENCES %s(%s)',
	254	join (', ', map { $util->quote($_) } @fields ),
	255	$util->quote($c->reference_table),
	256	join (', ', map { $util->quote($_) } @rfields )
	257	;
	258
	259	$fk_sql .= " ON DELETE " . $c->{on_delete} if $c->{on_delete};
	260	$fk_sql .= " ON UPDATE " . $c->{on_update} if $c->{on_update};
0dbd2362	261
	262	return $fk_sql;
	263	}
	264
bfb5a568	265	sub create_field
	266	{
	267	my ($field, $options) = @_;
	268
d8cf2279	269	my $field_name = $util->quote($field->name);
bfb5a568	270	debug("PKG: Looking at field '$field_name'\n");
ea93df61	271	my $field_comments = $field->comments
ea93df61	272	? "-- " . $field->comments . "\n "
bfb5a568	273	: '';
	274
	275	my $field_def = $field_comments.$field_name;
	276
	277	# data type and size
	278	my $size = $field->size;
	279	my $data_type = $field->data_type;
	280	$data_type = 'varchar' if lc $data_type eq 'set';
	281	$data_type = 'blob' if lc $data_type eq 'bytea';
	282
	283	if ( lc $data_type =~ /(text\|blob)/i ) {
	284	$size = undef;
	285	}
	286
	287	# if ( $data_type =~ /timestamp/i ) {
ea93df61	288	# push @trigger_defs,
bfb5a568	289	# "CREATE TRIGGER ts_${table_name} ".
	290	# "after insert on $table_name\n".
	291	# "begin\n".
	292	# " update $table_name set $field_name=timestamp() ".
	293	# "where id=new.id;\n".
	294	# "end;\n"
	295	# ;
	296	#
	297	# }
	298
	299	#
	300	# SQLite is generally typeless, but newer versions will
	301	# make a field autoincrement if it is declared as (and
	302	# only as) INTEGER PRIMARY KEY
	303	#
	304	my $pk = $field->table->primary_key;
	305	my @pk_fields = $pk ? $pk->fields : ();
	306
ea93df61	307	if (
ea93df61	308	$field->is_primary_key &&
bfb5a568	309	scalar @pk_fields == 1 &&
	310	(
	311	$data_type =~ /int(eger)?$/i
	312	\|\|
	313	( $data_type =~ /^number?$/i && $size !~ /,/ )
	314	)
	315	) {
	316	$data_type = 'INTEGER PRIMARY KEY';
	317	$size = undef;
	318	# $pk_set = 1;
	319	}
	320
ea93df61	321	$field_def .= sprintf " %s%s", $data_type,
bfb5a568	322	( !$field->is_auto_increment && $size ) ? "($size)" : '';
	323
	324	# Null?
	325	$field_def .= ' NOT NULL' unless $field->is_nullable;
	326
06baeb21	327	# Default?
	328	SQL::Translator::Producer->_apply_default_value(
	329	$field,
	330	\$field_def,
	331	[
	332	'NULL' => \'NULL',
	333	'now()' => 'now()',
	334	'CURRENT_TIMESTAMP' => 'CURRENT_TIMESTAMP',
	335	],
	336	);
bfb5a568	337
	338	return $field_def;
	339
	340	}
	341
	342	sub create_index
	343	{
	344	my ($index, $options) = @_;
	345
	346	my $name = $index->name;
ae602737	347	$name = mk_name($name);
4d438549	348
ea93df61	349	my $type = $index->type eq 'UNIQUE' ? "UNIQUE " : '';
bfb5a568	350
bfb5a568	351	# strip any field size qualifiers as SQLite doesn't like these
d8cf2279	352	my @fields = map { s/\(\d+\)$//; $util->quote($_) } $index->fields;
cc74bccc	353	(my $index_table_name = $index->table->name) =~ s/^.+?\.//; # table name may not specify schema
d8cf2279	354	$index_table_name = $util->quote($index_table_name);
cc74bccc	355	warn "removing schema name from '" . $index->table->name . "' to make '$index_table_name'\n" if $WARN;
ea93df61	356	my $index_def =
907f8cea	357	"CREATE ${type}INDEX $name ON " . $index_table_name .
907f8cea	358	' (' . join( ', ', @fields ) . ')';
bfb5a568	359
	360	return $index_def;
	361	}
	362
	363	sub create_constraint
	364	{
	365	my ($c, $options) = @_;
	366
	367	my $name = $c->name;
ae602737	368	$name = mk_name($name);
d8cf2279	369	my @fields = map $util->quote($_), $c->fields;
cc74bccc	370	(my $index_table_name = $c->table->name) =~ s/^.+?\.//; # table name may not specify schema
d8cf2279	371	$index_table_name = $util->quote($index_table_name);
cc74bccc	372	warn "removing schema name from '" . $c->table->name . "' to make '$index_table_name'\n" if $WARN;
bfb5a568	373
ea93df61	374	my $c_def =
907f8cea	375	"CREATE UNIQUE INDEX $name ON " . $index_table_name .
907f8cea	376	' (' . join( ', ', @fields ) . ')';
bfb5a568	377
	378	return $c_def;
	379	}
	380
d0fcb05d	381	sub create_trigger {
	382	my ($trigger, $options) = @_;
	383	my $add_drop = $options->{add_drop_trigger};
	384
410d4a42	385	my @statements;
d0fcb05d	386
410d4a42	387	my $trigger_name = $trigger->name;
56785c01	388	$global_names{$trigger_name} = 1;
56785c01	389
d0fcb05d	390	my $events = $trigger->database_events;
410d4a42	391	for my $evt ( @$events ) {
d0fcb05d	392
410d4a42	393	my $trig_name = $trigger_name;
	394	if (@$events > 1) {
	395	$trig_name .= "_$evt";
d0fcb05d	396
410d4a42	397	warn "Multiple database events supplied for trigger '$trigger_name', ",
	398	"creating trigger '$trig_name' for the '$evt' event.\n" if $WARN;
	399	}
d0fcb05d	400
d8cf2279	401	$trig_name = $util->quote($trig_name);
410d4a42	402	push @statements, "DROP TRIGGER IF EXISTS $trig_name" if $add_drop;
d0fcb05d	403
f9c96971	404
410d4a42	405	$DB::single = 1;
	406	my $action = "";
	407	if (not ref $trigger->action) {
	408	$action .= "BEGIN " . $trigger->action . " END";
f9c96971	409	}
410d4a42	410	else {
	411	$action = $trigger->action->{for_each} . " "
	412	if $trigger->action->{for_each};
	413
	414	$action = $trigger->action->{when} . " "
	415	if $trigger->action->{when};
d0fcb05d	416
410d4a42	417	my $steps = $trigger->action->{steps} \|\| [];
	418
	419	$action .= "BEGIN ";
	420	$action .= $_ . "; " for (@$steps);
	421	$action .= "END";
	422	}
	423
	424	push @statements, sprintf (
	425	'CREATE TRIGGER %s %s %s on %s %s',
	426	$trig_name,
	427	$trigger->perform_action_when,
	428	$evt,
d8cf2279	429	$util->quote($trigger->on_table),
410d4a42	430	$action
	431	);
	432	}
d0fcb05d	433
410d4a42	434	return @statements;
d0fcb05d	435	}
d0fcb05d	436
4d438549	437	sub alter_table { } # Noop
	438
	439	sub add_field {
	440	my ($field) = @_;
	441
	442	return sprintf("ALTER TABLE %s ADD COLUMN %s",
d8cf2279	443	$util->quote($field->table->name), create_field($field))
4d438549	444	}
	445
	446	sub alter_create_index {
	447	my ($index) = @_;
	448
	449	# This might cause name collisions
	450	return create_index($index);
	451	}
	452
	453	sub alter_create_constraint {
	454	my ($constraint) = @_;
	455
	456	return create_constraint($constraint) if $constraint->type eq 'UNIQUE';
	457	}
	458
	459	sub alter_drop_constraint { alter_drop_index(@_) }
	460
	461	sub alter_drop_index {
	462	my ($constraint) = @_;
	463
ecf7f25d	464	return sprintf("DROP INDEX %s",
d8cf2279	465	$util->quote($constraint->name));
4d438549	466	}
	467
	468	sub batch_alter_table {
	469	my ($table, $diffs) = @_;
	470
4d438549	471	# If we have any of the following
	472	#
	473	# rename_field
	474	# alter_field
	475	# drop_field
	476	#
	477	# we need to do the following <http://www.sqlite.org/faq.html#q11>
	478	#
	479	# BEGIN TRANSACTION;
	480	# CREATE TEMPORARY TABLE t1_backup(a,b);
	481	# INSERT INTO t1_backup SELECT a,b FROM t1;
	482	# DROP TABLE t1;
	483	# CREATE TABLE t1(a,b);
	484	# INSERT INTO t1 SELECT a,b FROM t1_backup;
	485	# DROP TABLE t1_backup;
	486	# COMMIT;
	487	#
	488	# Fun, eh?
46bf5655	489	#
	490	# If we have rename_field we do similarly.
	491
	492	my $table_name = $table->name;
	493	my $renaming = $diffs->{rename_table} && @{$diffs->{rename_table}};
4d438549	494
	495	if ( @{$diffs->{rename_field}} == 0 &&
	496	@{$diffs->{alter_field}} == 0 &&
46bf5655	497	@{$diffs->{drop_field}} == 0
46bf5655	498	) {
ea93df61	499	# return join("\n", map {
ea93df61	500	return map {
4d438549	501	my $meth = __PACKAGE__->can($_) or die __PACKAGE__ . " cant $_";
24d9fe69	502	map { my $sql = $meth->(ref $_ eq 'ARRAY' ? @$_ : $_); $sql ? ("$sql") : () } @{ $diffs->{$_} }
ea93df61	503
ea93df61	504	} grep { @{$diffs->{$_}} }
46bf5655	505	qw/rename_table
	506	alter_drop_constraint
	507	alter_drop_index
	508	drop_field
	509	add_field
	510	alter_field
	511	rename_field
	512	alter_create_index
	513	alter_create_constraint
24d9fe69	514	alter_table/;
4d438549	515	}
	516
	517
	518	my @sql;
46bf5655	519	my $old_table = $renaming ? $diffs->{rename_table}[0][0] : $table;
ea93df61	520
4d438549	521	do {
46bf5655	522	local $table->{name} = $table_name . '_temp_alter';
4d438549	523	# We only want the table - dont care about indexes on tmp table
	524	my ($table_sql) = create_table($table, {no_comments => 1, temporary_table => 1});
	525	push @sql,$table_sql;
	526	};
	527
d8cf2279	528	push @sql, "INSERT INTO @{[$util->quote($table_name.'_temp_alter')]} SELECT @{[ join(', ', map $util->quote($_), $old_table->get_fields)]} FROM @{[$util->quote($old_table)]}",
d8cf2279	529	"DROP TABLE @{[$util->quote($old_table)]}",
4d438549	530	create_table($table, { no_comments => 1 }),
d8cf2279	531	"INSERT INTO @{[$util->quote($table_name)]} SELECT @{[ join(', ', map $util->quote($_), $old_table->get_fields)]} FROM @{[$util->quote($table_name.'_temp_alter')]}",
d8cf2279	532	"DROP TABLE @{[$util->quote($table_name.'_temp_alter')]}";
4d438549	533
24d9fe69	534	return @sql;
24d9fe69	535	# return join("", @sql, "");
4d438549	536	}
	537
	538	sub drop_table {
	539	my ($table) = @_;
d8cf2279	540	$table = $util->quote($table);
24d9fe69	541	return "DROP TABLE $table";
4d438549	542	}
4d438549	543
46bf5655	544	sub rename_table {
	545	my ($old_table, $new_table, $options) = @_;
	546
d8cf2279	547	$old_table = $util->quote($old_table);
d8cf2279	548	$new_table = $util->quote($new_table);
46bf5655	549
d8cf2279	550	return "ALTER TABLE $old_table RENAME TO $new_table";
46bf5655	551
	552	}
	553
934e1b39	554	# No-op. Just here to signify that we are a new style parser.
	555	sub preproces_schema { }
	556
bfb5a568	557	1;
758ab1cd	558
20770e44	559	=pod
	560
	561	=head1 SEE ALSO
	562
	563	SQL::Translator, http://www.sqlite.org/.
758ab1cd	564
	565	=head1 AUTHOR
	566
11ad2df9	567	Ken Youens-Clark C<< <kclark@cpan.orgE> >>.
4d438549	568
4d438549	569	Diff code added by Ash Berlin C<< <ash@cpan.org> >>.
20770e44	570
20770e44	571	=cut