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

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

# -------------------------------------------------------------------
# $Id$
# -------------------------------------------------------------------
# Copyright (C) 2002-2009 SQLFairy Authors
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; version 2.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
# 02111-1307  USA
# -------------------------------------------------------------------

=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);

use vars qw[ $VERSION $DEBUG $WARN ];

$VERSION = '1.99';
$DEBUG = 0 unless defined $DEBUG;
$WARN = 0 unless defined $WARN;

our %used_identifiers = ();
our $max_id_length    = 30;
our %global_names;
our %truncated;

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 = $producer_args->{sqlite_version} || 0;
    my $no_txn         = $producer_args->{no_transaction};

    debug("PKG: Beginning production\n");

    my @create = ();
    push @create, header_comment unless ($no_comments);
    $create[0] .= "\n\nBEGIN 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,
      });
    }

    if (wantarray) {
      push @create, "COMMIT" unless $no_txn;
      return @create;
    } else {
      push @create, "COMMIT;\n" unless $no_txn;
      return join(";\n\n", @create );
    }
}

# -------------------------------------------------------------------
sub mk_name {
    my ($basename, $type, $scope, $critical) = @_;
    my $basename_orig = $basename;
    my $max_name      = !$max_id_length 
                      ? length($type) + 1
                      : $type 
                      ? $max_id_length - (length($type) + 1) 
                      : $max_id_length;
    $basename         = substr( $basename, 0, $max_name ) 
                        if length( $basename ) > $max_name;
    $basename         =~ s/\./_/g;
    my $name          = $type ? "${type}_$basename" : $basename;

    if ( $basename ne $basename_orig and $critical ) {
        my $show_type = $type ? "+'$type'" : "";
        warn "Truncating '$basename_orig'$show_type to $max_id_length ",
            "character limit to make '$name'\n" if $WARN;
        $truncated{ $basename_orig } = $name;
    }

    $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 $name;
}

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

    my $view_name = $view->name;
    debug("PKG: Looking at view '${view_name}'\n");

    # Header.  Should this look like what mysqldump produces?
    my $extra = $view->extra;
    my $create = '';
    $create .= "--\n-- View: ${view_name}\n--\n" unless $options->{no_comments};
    $create .= "DROP VIEW IF EXISTS $view_name;\n" if $add_drop_view;
    $create .= 'CREATE';
    $create .= " TEMPORARY" if exists($extra->{temporary}) && $extra->{temporary};
    $create .= ' VIEW';
    $create .= " IF NOT EXISTS" if exists($extra->{if_not_exists}) && $extra->{if_not_exists};
    $create .= " ${view_name}";

    if( my $sql = $view->sql ){
      $create .= " AS\n    ${sql}";
    }
    return $create;
}


sub create_table
{
    my ($table, $options) = @_;

    my $table_name = $table->name;
    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 >= 3.3) ? ' 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(', ', @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 ) {
        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_field
{
    my ($field, $options) = @_;

    my $field_name = $field->name;
    debug("PKG: Looking at field '$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?  XXX Need better quoting!
    my $default = $field->default_value;
    if (defined $default) {
        SQL::Translator::Producer->_apply_default_value(
            \$field_def,
            $default, 
            [
             'NULL'              => \'NULL',
             'now()'             => 'now()',
             'CURRENT_TIMESTAMP' => 'CURRENT_TIMESTAMP',
            ],
        );
    }

    return $field_def;

}

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

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

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

    # strip any field size qualifiers as SQLite doesn't like these
    my @fields = map { s/\(\d+\)$//; $_ } $index->fields;
    (my $index_table_name = $index->table->name) =~ s/^.+?\.//; # table name may not specify schema
    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;
    $name      = mk_name($c->table->name, $name);
    my @fields = $c->fields;
    (my $index_table_name = $c->table->name) =~ s/^.+?\.//; # table name may not specify schema
    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 $name = $trigger->name;
  my @create;

  push @create,  "DROP TRIGGER IF EXISTS $name" if $add_drop;

  my $events = $trigger->database_events;
  die "Can't handle multiple events in triggers" if @$events > 1;

  my $action = "";

  $DB::single = 1;
  unless (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} || [];

    $action .= "BEGIN ";
    for (@$steps) {
      $action .= $_ . "; "
    }
    $action .= "END";
  }

  push @create, "CREATE TRIGGER $name " .
                $trigger->perform_action_when . " " .
                $events->[0] .
                " on " . $trigger->on_table . " " .
                $action;

  return @create;
            
}

sub alter_table { } # Noop

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

  return sprintf("ALTER TABLE %s ADD COLUMN %s",
      $field->table->name, create_field($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",
      $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 @{[$table_name]}_temp_alter SELECT @{[ join(', ', $old_table->get_fields)]} FROM @{[$old_table]}",
             "DROP TABLE @{[$old_table]}",
             create_table($table, { no_comments => 1 }),
             "INSERT INTO @{[$table_name]} SELECT @{[ join(', ', $old_table->get_fields)]} FROM @{[$table_name]}_temp_alter",
             "DROP TABLE @{[$table_name]}_temp_alter";

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

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

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

  my $qt = $options->{quote_table_names} || '';

  return "ALTER TABLE $qt$old_table$qt RENAME TO $qt$new_table$qt";

}

# 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 Y. 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;
	2
	3	# -------------------------------------------------------------------
782b5a43	4	# $Id$
758ab1cd	5	# -------------------------------------------------------------------
478f608d	6	# Copyright (C) 2002-2009 SQLFairy Authors
758ab1cd	7	#
	8	# This program is free software; you can redistribute it and/or
	9	# modify it under the terms of the GNU General Public License as
	10	# published by the Free Software Foundation; version 2.
	11	#
	12	# This program is distributed in the hope that it will be useful, but
	13	# WITHOUT ANY WARRANTY; without even the implied warranty of
	14	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	# General Public License for more details.
	16	#
	17	# You should have received a copy of the GNU General Public License
	18	# along with this program; if not, write to the Free Software
	19	# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	20	# 02111-1307 USA
	21	# -------------------------------------------------------------------
	22
20770e44	23	=head1 NAME
	24
	25	SQL::Translator::Producer::SQLite - SQLite producer for SQL::Translator
	26
	27	=head1 SYNOPSIS
	28
	29	use SQL::Translator;
	30
	31	my $t = SQL::Translator->new( parser => '...', producer => 'SQLite' );
	32	$t->translate;
	33
	34	=head1 DESCRIPTION
	35
	36	This module will produce text output of the schema suitable for SQLite.
	37
	38	=cut
	39
758ab1cd	40	use strict;
d0fcb05d	41	use warnings;
758ab1cd	42	use Data::Dumper;
b21bf652	43	use SQL::Translator::Schema::Constants;
5ee19df8	44	use SQL::Translator::Utils qw(debug header_comment);
758ab1cd	45
da06ac74	46	use vars qw[ $VERSION $DEBUG $WARN ];
5ee19df8	47
da06ac74	48	$VERSION = '1.99';
5ee19df8	49	$DEBUG = 0 unless defined $DEBUG;
5ee19df8	50	$WARN = 0 unless defined $WARN;
758ab1cd	51
d0fcb05d	52	our %used_identifiers = ();
	53	our $max_id_length = 30;
	54	our %global_names;
	55	our %truncated;
758ab1cd	56
758ab1cd	57	sub produce {
a1d94525	58	my $translator = shift;
	59	local $DEBUG = $translator->debug;
	60	local $WARN = $translator->show_warnings;
	61	my $no_comments = $translator->no_comments;
	62	my $add_drop_table = $translator->add_drop_table;
	63	my $schema = $translator->schema;
d12f72ff	64	my $producer_args = $translator->producer_args;
f9c96971	65	my $sqlite_version = $producer_args->{sqlite_version} \|\| 0;
f9c96971	66	my $no_txn = $producer_args->{no_transaction};
758ab1cd	67
1a24938d	68	debug("PKG: Beginning production\n");
758ab1cd	69
24d9fe69	70	my @create = ();
24d9fe69	71	push @create, header_comment unless ($no_comments);
f9c96971	72	$create[0] .= "\n\nBEGIN TRANSACTION" unless $no_txn;
758ab1cd	73
b21bf652	74	for my $table ( $schema->get_tables ) {
24d9fe69	75	push @create, create_table($table, { no_comments => $no_comments,
d12f72ff	76	sqlite_version => $sqlite_version,
4d438549	77	add_drop_table => $add_drop_table,});
a5a882f0	78	}
a5a882f0	79
ec59a597	80	for my $view ( $schema->get_views ) {
24d9fe69	81	push @create, create_view($view, {
a25ac5d2	82	add_drop_view => $add_drop_table,
	83	no_comments => $no_comments,
	84	});
ec59a597	85	}
ec59a597	86
d0fcb05d	87	for my $trigger ( $schema->get_triggers ) {
	88	push @create, create_trigger($trigger, {
	89	add_drop_trigger => $add_drop_table,
	90	no_comments => $no_comments,
	91	});
	92	}
	93
f9c96971	94	if (wantarray) {
	95	push @create, "COMMIT" unless $no_txn;
	96	return @create;
	97	} else {
	98	push @create, "COMMIT;\n" unless $no_txn;
	99	return join(";\n\n", @create );
	100	}
758ab1cd	101	}
758ab1cd	102
758ab1cd	103	# -------------------------------------------------------------------
	104	sub mk_name {
	105	my ($basename, $type, $scope, $critical) = @_;
	106	my $basename_orig = $basename;
d0fcb05d	107	my $max_name = !$max_id_length
	108	? length($type) + 1
	109	: $type
	110	? $max_id_length - (length($type) + 1)
	111	: $max_id_length;
758ab1cd	112	$basename = substr( $basename, 0, $max_name )
758ab1cd	113	if length( $basename ) > $max_name;
cc74bccc	114	$basename =~ s/\./_/g;
758ab1cd	115	my $name = $type ? "${type}_$basename" : $basename;
	116
	117	if ( $basename ne $basename_orig and $critical ) {
	118	my $show_type = $type ? "+'$type'" : "";
	119	warn "Truncating '$basename_orig'$show_type to $max_id_length ",
	120	"character limit to make '$name'\n" if $WARN;
	121	$truncated{ $basename_orig } = $name;
	122	}
	123
	124	$scope \|\|= \%global_names;
	125	if ( my $prev = $scope->{ $name } ) {
	126	my $name_orig = $name;
	127	$name .= sprintf( "%02d", ++$prev );
	128	substr($name, $max_id_length - 3) = "00"
	129	if length( $name ) > $max_id_length;
	130
	131	warn "The name '$name_orig' has been changed to ",
	132	"'$name' to make it unique.\n" if $WARN;
	133
	134	$scope->{ $name_orig }++;
	135	}
	136
	137	$scope->{ $name }++;
	138	return $name;
	139	}
	140
ec59a597	141	sub create_view {
ec59a597	142	my ($view, $options) = @_;
a25ac5d2	143	my $add_drop_view = $options->{add_drop_view};
ec59a597	144
	145	my $view_name = $view->name;
	146	debug("PKG: Looking at view '${view_name}'\n");
	147
	148	# Header. Should this look like what mysqldump produces?
	149	my $extra = $view->extra;
	150	my $create = '';
	151	$create .= "--\n-- View: ${view_name}\n--\n" unless $options->{no_comments};
a25ac5d2	152	$create .= "DROP VIEW IF EXISTS $view_name;\n" if $add_drop_view;
ec59a597	153	$create .= 'CREATE';
	154	$create .= " TEMPORARY" if exists($extra->{temporary}) && $extra->{temporary};
	155	$create .= ' VIEW';
	156	$create .= " IF NOT EXISTS" if exists($extra->{if_not_exists}) && $extra->{if_not_exists};
	157	$create .= " ${view_name}";
	158
	159	if( my $sql = $view->sql ){
a25ac5d2	160	$create .= " AS\n ${sql}";
ec59a597	161	}
ec59a597	162	return $create;
	163	}
	164
	165
bfb5a568	166	sub create_table
	167	{
	168	my ($table, $options) = @_;
758ab1cd	169
bfb5a568	170	my $table_name = $table->name;
	171	my $no_comments = $options->{no_comments};
	172	my $add_drop_table = $options->{add_drop_table};
3db73ef8	173	my $sqlite_version = $options->{sqlite_version} \|\| 0;
bfb5a568	174
	175	debug("PKG: Looking at table '$table_name'\n");
	176
d0fcb05d	177	my ( @index_defs, @constraint_defs );
bfb5a568	178	my @fields = $table->get_fields or die "No fields in $table_name";
bfb5a568	179
4d438549	180	my $temp = $options->{temporary_table} ? 'TEMPORARY ' : '';
bfb5a568	181	#
	182	# Header.
	183	#
d12f72ff	184	my $exists = ($sqlite_version >= 3.3) ? ' IF EXISTS' : '';
24d9fe69	185	my @create;
d0fcb05d	186	my ($comment, $create_table) = "";
	187	$comment = "--\n-- Table: $table_name\n--\n" unless $no_comments;
	188	if ($add_drop_table) {
	189	push @create, $comment . qq[DROP TABLE$exists $table_name];
	190	} else {
	191	$create_table = $comment;
	192	}
	193
	194	$create_table .= "CREATE ${temp}TABLE $table_name (\n";
bfb5a568	195
	196	#
	197	# Comments
	198	#
	199	if ( $table->comments and !$no_comments ){
24d9fe69	200	$create_table .= "-- Comments: \n-- ";
	201	$create_table .= join "\n-- ", $table->comments;
	202	$create_table .= "\n--\n\n";
bfb5a568	203	}
	204
	205	#
	206	# How many fields in PK?
	207	#
	208	my $pk = $table->primary_key;
	209	my @pk_fields = $pk ? $pk->fields : ();
	210
	211	#
	212	# Fields
	213	#
	214	my ( @field_defs, $pk_set );
	215	for my $field ( @fields ) {
	216	push @field_defs, create_field($field);
	217	}
	218
	219	if (
	220	scalar @pk_fields > 1
	221	\|\|
	222	( @pk_fields && !grep /INTEGER PRIMARY KEY/, @field_defs )
	223	) {
	224	push @field_defs, 'PRIMARY KEY (' . join(', ', @pk_fields ) . ')';
	225	}
	226
	227	#
	228	# Indices
	229	#
	230	my $idx_name_default = 'A';
	231	for my $index ( $table->get_indices ) {
	232	push @index_defs, create_index($index);
	233	}
	234
	235	#
	236	# Constraints
	237	#
	238	my $c_name_default = 'A';
	239	for my $c ( $table->get_constraints ) {
	240	next unless $c->type eq UNIQUE;
	241	push @constraint_defs, create_constraint($c);
	242	}
	243
24d9fe69	244	$create_table .= join(",\n", map { " $_" } @field_defs ) . "\n)";
bfb5a568	245
d0fcb05d	246	return (@create, $create_table, @index_defs, @constraint_defs );
bfb5a568	247	}
	248
	249	sub create_field
	250	{
	251	my ($field, $options) = @_;
	252
	253	my $field_name = $field->name;
	254	debug("PKG: Looking at field '$field_name'\n");
	255	my $field_comments = $field->comments
	256	? "-- " . $field->comments . "\n "
	257	: '';
	258
	259	my $field_def = $field_comments.$field_name;
	260
	261	# data type and size
	262	my $size = $field->size;
	263	my $data_type = $field->data_type;
	264	$data_type = 'varchar' if lc $data_type eq 'set';
	265	$data_type = 'blob' if lc $data_type eq 'bytea';
	266
	267	if ( lc $data_type =~ /(text\|blob)/i ) {
	268	$size = undef;
	269	}
	270
	271	# if ( $data_type =~ /timestamp/i ) {
	272	# push @trigger_defs,
	273	# "CREATE TRIGGER ts_${table_name} ".
	274	# "after insert on $table_name\n".
	275	# "begin\n".
	276	# " update $table_name set $field_name=timestamp() ".
	277	# "where id=new.id;\n".
	278	# "end;\n"
	279	# ;
	280	#
	281	# }
	282
	283	#
	284	# SQLite is generally typeless, but newer versions will
	285	# make a field autoincrement if it is declared as (and
	286	# only as) INTEGER PRIMARY KEY
	287	#
	288	my $pk = $field->table->primary_key;
	289	my @pk_fields = $pk ? $pk->fields : ();
	290
	291	if (
	292	$field->is_primary_key &&
	293	scalar @pk_fields == 1 &&
	294	(
	295	$data_type =~ /int(eger)?$/i
	296	\|\|
	297	( $data_type =~ /^number?$/i && $size !~ /,/ )
	298	)
	299	) {
	300	$data_type = 'INTEGER PRIMARY KEY';
	301	$size = undef;
	302	# $pk_set = 1;
	303	}
	304
	305	$field_def .= sprintf " %s%s", $data_type,
	306	( !$field->is_auto_increment && $size ) ? "($size)" : '';
	307
	308	# Null?
	309	$field_def .= ' NOT NULL' unless $field->is_nullable;
	310
311	# Default? XXX Need better quoting!
312	my $default = $field->default_value;
bc8e2aa1	313	if (defined $default) {
	314	SQL::Translator::Producer->_apply_default_value(
	315	\$field_def,
	316	$default,
	317	[
	318	'NULL' => \'NULL',
	319	'now()' => 'now()',
	320	'CURRENT_TIMESTAMP' => 'CURRENT_TIMESTAMP',
	321	],
	322	);
bfb5a568	323	}
	324
	325	return $field_def;
	326
	327	}
	328
	329	sub create_index
	330	{
	331	my ($index, $options) = @_;
	332
	333	my $name = $index->name;
4d438549	334	$name = mk_name($index->table->name, $name);
	335
	336	my $type = $index->type eq 'UNIQUE' ? "UNIQUE " : '';
bfb5a568	337
	338	# strip any field size qualifiers as SQLite doesn't like these
	339	my @fields = map { s/\(\d+\)$//; $_ } $index->fields;
cc74bccc	340	(my $index_table_name = $index->table->name) =~ s/^.+?\.//; # table name may not specify schema
cc74bccc	341	warn "removing schema name from '" . $index->table->name . "' to make '$index_table_name'\n" if $WARN;
bfb5a568	342	my $index_def =
907f8cea	343	"CREATE ${type}INDEX $name ON " . $index_table_name .
907f8cea	344	' (' . join( ', ', @fields ) . ')';
bfb5a568	345
	346	return $index_def;
	347	}
	348
	349	sub create_constraint
	350	{
	351	my ($c, $options) = @_;
	352
	353	my $name = $c->name;
4d438549	354	$name = mk_name($c->table->name, $name);
bfb5a568	355	my @fields = $c->fields;
cc74bccc	356	(my $index_table_name = $c->table->name) =~ s/^.+?\.//; # table name may not specify schema
cc74bccc	357	warn "removing schema name from '" . $c->table->name . "' to make '$index_table_name'\n" if $WARN;
bfb5a568	358
bfb5a568	359	my $c_def =
907f8cea	360	"CREATE UNIQUE INDEX $name ON " . $index_table_name .
907f8cea	361	' (' . join( ', ', @fields ) . ')';
bfb5a568	362
	363	return $c_def;
	364	}
	365
d0fcb05d	366	sub create_trigger {
	367	my ($trigger, $options) = @_;
	368	my $add_drop = $options->{add_drop_trigger};
	369
	370	my $name = $trigger->name;
	371	my @create;
	372
	373	push @create, "DROP TRIGGER IF EXISTS $name" if $add_drop;
	374
	375	my $events = $trigger->database_events;
	376	die "Can't handle multiple events in triggers" if @$events > 1;
	377
	378	my $action = "";
d0fcb05d	379
f9c96971	380	$DB::single = 1;
	381	unless (ref $trigger->action) {
	382	$action .= "BEGIN " . $trigger->action . " END";
	383	} else {
	384	$action = $trigger->action->{for_each} . " "
	385	if $trigger->action->{for_each};
d0fcb05d	386
f9c96971	387	$action = $trigger->action->{when} . " "
f9c96971	388	if $trigger->action->{when};
d0fcb05d	389
f9c96971	390	my $steps = $trigger->action->{steps} \|\| [];
	391
	392	$action .= "BEGIN ";
	393	for (@$steps) {
	394	$action .= $_ . "; "
	395	}
	396	$action .= "END";
d0fcb05d	397	}
d0fcb05d	398
	399	push @create, "CREATE TRIGGER $name " .
	400	$trigger->perform_action_when . " " .
	401	$events->[0] .
	402	" on " . $trigger->on_table . " " .
	403	$action;
	404
	405	return @create;
	406
	407	}
	408
4d438549	409	sub alter_table { } # Noop
	410
	411	sub add_field {
	412	my ($field) = @_;
	413
	414	return sprintf("ALTER TABLE %s ADD COLUMN %s",
	415	$field->table->name, create_field($field))
	416	}
	417
	418	sub alter_create_index {
	419	my ($index) = @_;
	420
	421	# This might cause name collisions
	422	return create_index($index);
	423	}
	424
	425	sub alter_create_constraint {
	426	my ($constraint) = @_;
	427
	428	return create_constraint($constraint) if $constraint->type eq 'UNIQUE';
	429	}
	430
	431	sub alter_drop_constraint { alter_drop_index(@_) }
	432
	433	sub alter_drop_index {
	434	my ($constraint) = @_;
	435
ecf7f25d	436	return sprintf("DROP INDEX %s",
ecf7f25d	437	$constraint->name);
4d438549	438	}
	439
	440	sub batch_alter_table {
	441	my ($table, $diffs) = @_;
	442
4d438549	443	# If we have any of the following
	444	#
	445	# rename_field
	446	# alter_field
	447	# drop_field
	448	#
	449	# we need to do the following <http://www.sqlite.org/faq.html#q11>
	450	#
	451	# BEGIN TRANSACTION;
	452	# CREATE TEMPORARY TABLE t1_backup(a,b);
	453	# INSERT INTO t1_backup SELECT a,b FROM t1;
	454	# DROP TABLE t1;
	455	# CREATE TABLE t1(a,b);
	456	# INSERT INTO t1 SELECT a,b FROM t1_backup;
	457	# DROP TABLE t1_backup;
	458	# COMMIT;
	459	#
	460	# Fun, eh?
46bf5655	461	#
	462	# If we have rename_field we do similarly.
	463
	464	my $table_name = $table->name;
	465	my $renaming = $diffs->{rename_table} && @{$diffs->{rename_table}};
4d438549	466
	467	if ( @{$diffs->{rename_field}} == 0 &&
	468	@{$diffs->{alter_field}} == 0 &&
46bf5655	469	@{$diffs->{drop_field}} == 0
46bf5655	470	) {
24d9fe69	471	# return join("\n", map {
24d9fe69	472	return map {
4d438549	473	my $meth = __PACKAGE__->can($_) or die __PACKAGE__ . " cant $_";
24d9fe69	474	map { my $sql = $meth->(ref $_ eq 'ARRAY' ? @$_ : $_); $sql ? ("$sql") : () } @{ $diffs->{$_} }
4d438549	475
46bf5655	476	} grep { @{$diffs->{$_}} }
	477	qw/rename_table
	478	alter_drop_constraint
	479	alter_drop_index
	480	drop_field
	481	add_field
	482	alter_field
	483	rename_field
	484	alter_create_index
	485	alter_create_constraint
24d9fe69	486	alter_table/;
4d438549	487	}
	488
	489
	490	my @sql;
46bf5655	491	my $old_table = $renaming ? $diffs->{rename_table}[0][0] : $table;
4d438549	492
4d438549	493	do {
46bf5655	494	local $table->{name} = $table_name . '_temp_alter';
4d438549	495	# We only want the table - dont care about indexes on tmp table
	496	my ($table_sql) = create_table($table, {no_comments => 1, temporary_table => 1});
	497	push @sql,$table_sql;
	498	};
	499
46bf5655	500	push @sql, "INSERT INTO @{[$table_name]}_temp_alter SELECT @{[ join(', ', $old_table->get_fields)]} FROM @{[$old_table]}",
46bf5655	501	"DROP TABLE @{[$old_table]}",
4d438549	502	create_table($table, { no_comments => 1 }),
46bf5655	503	"INSERT INTO @{[$table_name]} SELECT @{[ join(', ', $old_table->get_fields)]} FROM @{[$table_name]}_temp_alter",
46bf5655	504	"DROP TABLE @{[$table_name]}_temp_alter";
4d438549	505
24d9fe69	506	return @sql;
24d9fe69	507	# return join("", @sql, "");
4d438549	508	}
	509
	510	sub drop_table {
	511	my ($table) = @_;
24d9fe69	512	return "DROP TABLE $table";
4d438549	513	}
4d438549	514
46bf5655	515	sub rename_table {
	516	my ($old_table, $new_table, $options) = @_;
	517
	518	my $qt = $options->{quote_table_names} \|\| '';
	519
	520	return "ALTER TABLE $qt$old_table$qt RENAME TO $qt$new_table$qt";
	521
	522	}
	523
934e1b39	524	# No-op. Just here to signify that we are a new style parser.
	525	sub preproces_schema { }
	526
bfb5a568	527	1;
758ab1cd	528
20770e44	529	=pod
	530
	531	=head1 SEE ALSO
	532
	533	SQL::Translator, http://www.sqlite.org/.
758ab1cd	534
	535	=head1 AUTHOR
	536
4d438549	537	Ken Y. Clark C<< <kclark@cpan.orgE> >>.
	538
	539	Diff code added by Ash Berlin C<< <ash@cpan.org> >>.
20770e44	540
20770e44	541	=cut