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

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

# -------------------------------------------------------------------
# $Id: SQLite.pm 1445 2009-02-07 17:50:03Z ashberlin $
# -------------------------------------------------------------------
# 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[ $DEBUG $WARN ];

$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	# -------------------------------------------------------------------
d4f84dd1	4	# $Id: SQLite.pm 1445 2009-02-07 17:50:03Z ashberlin $
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
478f608d	46	use vars qw[ $DEBUG $WARN ];
5ee19df8	47
5ee19df8	48	$DEBUG = 0 unless defined $DEBUG;
5ee19df8	49	$WARN = 0 unless defined $WARN;
758ab1cd	50
d0fcb05d	51	our %used_identifiers = ();
	52	our $max_id_length = 30;
	53	our %global_names;
	54	our %truncated;
758ab1cd	55
758ab1cd	56	sub produce {
a1d94525	57	my $translator = shift;
	58	local $DEBUG = $translator->debug;
	59	local $WARN = $translator->show_warnings;
	60	my $no_comments = $translator->no_comments;
	61	my $add_drop_table = $translator->add_drop_table;
	62	my $schema = $translator->schema;
d12f72ff	63	my $producer_args = $translator->producer_args;
f9c96971	64	my $sqlite_version = $producer_args->{sqlite_version} \|\| 0;
f9c96971	65	my $no_txn = $producer_args->{no_transaction};
758ab1cd	66
1a24938d	67	debug("PKG: Beginning production\n");
758ab1cd	68
24d9fe69	69	my @create = ();
24d9fe69	70	push @create, header_comment unless ($no_comments);
f9c96971	71	$create[0] .= "\n\nBEGIN TRANSACTION" unless $no_txn;
758ab1cd	72
b21bf652	73	for my $table ( $schema->get_tables ) {
24d9fe69	74	push @create, create_table($table, { no_comments => $no_comments,
d12f72ff	75	sqlite_version => $sqlite_version,
4d438549	76	add_drop_table => $add_drop_table,});
a5a882f0	77	}
a5a882f0	78
ec59a597	79	for my $view ( $schema->get_views ) {
24d9fe69	80	push @create, create_view($view, {
a25ac5d2	81	add_drop_view => $add_drop_table,
	82	no_comments => $no_comments,
	83	});
ec59a597	84	}
ec59a597	85
d0fcb05d	86	for my $trigger ( $schema->get_triggers ) {
	87	push @create, create_trigger($trigger, {
	88	add_drop_trigger => $add_drop_table,
	89	no_comments => $no_comments,
	90	});
	91	}
	92
f9c96971	93	if (wantarray) {
	94	push @create, "COMMIT" unless $no_txn;
	95	return @create;
	96	} else {
	97	push @create, "COMMIT;\n" unless $no_txn;
	98	return join(";\n\n", @create );
	99	}
758ab1cd	100	}
758ab1cd	101
758ab1cd	102	# -------------------------------------------------------------------
	103	sub mk_name {
	104	my ($basename, $type, $scope, $critical) = @_;
	105	my $basename_orig = $basename;
d0fcb05d	106	my $max_name = !$max_id_length
	107	? length($type) + 1
	108	: $type
	109	? $max_id_length - (length($type) + 1)
	110	: $max_id_length;
758ab1cd	111	$basename = substr( $basename, 0, $max_name )
758ab1cd	112	if length( $basename ) > $max_name;
cc74bccc	113	$basename =~ s/\./_/g;
758ab1cd	114	my $name = $type ? "${type}_$basename" : $basename;
	115
	116	if ( $basename ne $basename_orig and $critical ) {
	117	my $show_type = $type ? "+'$type'" : "";
	118	warn "Truncating '$basename_orig'$show_type to $max_id_length ",
	119	"character limit to make '$name'\n" if $WARN;
	120	$truncated{ $basename_orig } = $name;
	121	}
	122
	123	$scope \|\|= \%global_names;
	124	if ( my $prev = $scope->{ $name } ) {
	125	my $name_orig = $name;
	126	$name .= sprintf( "%02d", ++$prev );
	127	substr($name, $max_id_length - 3) = "00"
	128	if length( $name ) > $max_id_length;
	129
	130	warn "The name '$name_orig' has been changed to ",
	131	"'$name' to make it unique.\n" if $WARN;
	132
	133	$scope->{ $name_orig }++;
	134	}
	135
	136	$scope->{ $name }++;
	137	return $name;
	138	}
	139
ec59a597	140	sub create_view {
ec59a597	141	my ($view, $options) = @_;
a25ac5d2	142	my $add_drop_view = $options->{add_drop_view};
ec59a597	143
	144	my $view_name = $view->name;
	145	debug("PKG: Looking at view '${view_name}'\n");
	146
	147	# Header. Should this look like what mysqldump produces?
	148	my $extra = $view->extra;
	149	my $create = '';
	150	$create .= "--\n-- View: ${view_name}\n--\n" unless $options->{no_comments};
a25ac5d2	151	$create .= "DROP VIEW IF EXISTS $view_name;\n" if $add_drop_view;
ec59a597	152	$create .= 'CREATE';
	153	$create .= " TEMPORARY" if exists($extra->{temporary}) && $extra->{temporary};
	154	$create .= ' VIEW';
	155	$create .= " IF NOT EXISTS" if exists($extra->{if_not_exists}) && $extra->{if_not_exists};
	156	$create .= " ${view_name}";
	157
	158	if( my $sql = $view->sql ){
a25ac5d2	159	$create .= " AS\n ${sql}";
ec59a597	160	}
ec59a597	161	return $create;
	162	}
	163
	164
bfb5a568	165	sub create_table
	166	{
	167	my ($table, $options) = @_;
758ab1cd	168
bfb5a568	169	my $table_name = $table->name;
	170	my $no_comments = $options->{no_comments};
	171	my $add_drop_table = $options->{add_drop_table};
3db73ef8	172	my $sqlite_version = $options->{sqlite_version} \|\| 0;
bfb5a568	173
	174	debug("PKG: Looking at table '$table_name'\n");
	175
d0fcb05d	176	my ( @index_defs, @constraint_defs );
bfb5a568	177	my @fields = $table->get_fields or die "No fields in $table_name";
bfb5a568	178
4d438549	179	my $temp = $options->{temporary_table} ? 'TEMPORARY ' : '';
bfb5a568	180	#
	181	# Header.
	182	#
d12f72ff	183	my $exists = ($sqlite_version >= 3.3) ? ' IF EXISTS' : '';
24d9fe69	184	my @create;
d0fcb05d	185	my ($comment, $create_table) = "";
	186	$comment = "--\n-- Table: $table_name\n--\n" unless $no_comments;
	187	if ($add_drop_table) {
	188	push @create, $comment . qq[DROP TABLE$exists $table_name];
	189	} else {
	190	$create_table = $comment;
	191	}
	192
	193	$create_table .= "CREATE ${temp}TABLE $table_name (\n";
bfb5a568	194
	195	#
	196	# Comments
	197	#
	198	if ( $table->comments and !$no_comments ){
24d9fe69	199	$create_table .= "-- Comments: \n-- ";
	200	$create_table .= join "\n-- ", $table->comments;
	201	$create_table .= "\n--\n\n";
bfb5a568	202	}
	203
	204	#
	205	# How many fields in PK?
	206	#
	207	my $pk = $table->primary_key;
	208	my @pk_fields = $pk ? $pk->fields : ();
	209
	210	#
	211	# Fields
	212	#
	213	my ( @field_defs, $pk_set );
	214	for my $field ( @fields ) {
	215	push @field_defs, create_field($field);
	216	}
	217
	218	if (
	219	scalar @pk_fields > 1
	220	\|\|
	221	( @pk_fields && !grep /INTEGER PRIMARY KEY/, @field_defs )
	222	) {
	223	push @field_defs, 'PRIMARY KEY (' . join(', ', @pk_fields ) . ')';
	224	}
	225
	226	#
	227	# Indices
	228	#
	229	my $idx_name_default = 'A';
	230	for my $index ( $table->get_indices ) {
	231	push @index_defs, create_index($index);
	232	}
	233
	234	#
	235	# Constraints
	236	#
	237	my $c_name_default = 'A';
	238	for my $c ( $table->get_constraints ) {
	239	next unless $c->type eq UNIQUE;
	240	push @constraint_defs, create_constraint($c);
	241	}
	242
24d9fe69	243	$create_table .= join(",\n", map { " $_" } @field_defs ) . "\n)";
bfb5a568	244
d0fcb05d	245	return (@create, $create_table, @index_defs, @constraint_defs );
bfb5a568	246	}
	247
	248	sub create_field
	249	{
	250	my ($field, $options) = @_;
	251
	252	my $field_name = $field->name;
	253	debug("PKG: Looking at field '$field_name'\n");
	254	my $field_comments = $field->comments
	255	? "-- " . $field->comments . "\n "
	256	: '';
	257
	258	my $field_def = $field_comments.$field_name;
	259
	260	# data type and size
	261	my $size = $field->size;
	262	my $data_type = $field->data_type;
	263	$data_type = 'varchar' if lc $data_type eq 'set';
	264	$data_type = 'blob' if lc $data_type eq 'bytea';
	265
	266	if ( lc $data_type =~ /(text\|blob)/i ) {
	267	$size = undef;
	268	}
	269
	270	# if ( $data_type =~ /timestamp/i ) {
	271	# push @trigger_defs,
	272	# "CREATE TRIGGER ts_${table_name} ".
	273	# "after insert on $table_name\n".
	274	# "begin\n".
	275	# " update $table_name set $field_name=timestamp() ".
	276	# "where id=new.id;\n".
	277	# "end;\n"
	278	# ;
	279	#
	280	# }
	281
	282	#
	283	# SQLite is generally typeless, but newer versions will
	284	# make a field autoincrement if it is declared as (and
	285	# only as) INTEGER PRIMARY KEY
	286	#
	287	my $pk = $field->table->primary_key;
	288	my @pk_fields = $pk ? $pk->fields : ();
	289
	290	if (
	291	$field->is_primary_key &&
	292	scalar @pk_fields == 1 &&
	293	(
	294	$data_type =~ /int(eger)?$/i
	295	\|\|
	296	( $data_type =~ /^number?$/i && $size !~ /,/ )
	297	)
	298	) {
	299	$data_type = 'INTEGER PRIMARY KEY';
	300	$size = undef;
	301	# $pk_set = 1;
	302	}
	303
	304	$field_def .= sprintf " %s%s", $data_type,
	305	( !$field->is_auto_increment && $size ) ? "($size)" : '';
	306
	307	# Null?
	308	$field_def .= ' NOT NULL' unless $field->is_nullable;
	309
310	# Default? XXX Need better quoting!
311	my $default = $field->default_value;
bc8e2aa1	312	if (defined $default) {
	313	SQL::Translator::Producer->_apply_default_value(
	314	\$field_def,
	315	$default,
	316	[
	317	'NULL' => \'NULL',
	318	'now()' => 'now()',
	319	'CURRENT_TIMESTAMP' => 'CURRENT_TIMESTAMP',
	320	],
	321	);
bfb5a568	322	}
	323
	324	return $field_def;
	325
	326	}
	327
	328	sub create_index
	329	{
	330	my ($index, $options) = @_;
	331
	332	my $name = $index->name;
4d438549	333	$name = mk_name($index->table->name, $name);
	334
	335	my $type = $index->type eq 'UNIQUE' ? "UNIQUE " : '';
bfb5a568	336
	337	# strip any field size qualifiers as SQLite doesn't like these
	338	my @fields = map { s/\(\d+\)$//; $_ } $index->fields;
cc74bccc	339	(my $index_table_name = $index->table->name) =~ s/^.+?\.//; # table name may not specify schema
cc74bccc	340	warn "removing schema name from '" . $index->table->name . "' to make '$index_table_name'\n" if $WARN;
bfb5a568	341	my $index_def =
907f8cea	342	"CREATE ${type}INDEX $name ON " . $index_table_name .
907f8cea	343	' (' . join( ', ', @fields ) . ')';
bfb5a568	344
	345	return $index_def;
	346	}
	347
	348	sub create_constraint
	349	{
	350	my ($c, $options) = @_;
	351
	352	my $name = $c->name;
4d438549	353	$name = mk_name($c->table->name, $name);
bfb5a568	354	my @fields = $c->fields;
cc74bccc	355	(my $index_table_name = $c->table->name) =~ s/^.+?\.//; # table name may not specify schema
cc74bccc	356	warn "removing schema name from '" . $c->table->name . "' to make '$index_table_name'\n" if $WARN;
bfb5a568	357
bfb5a568	358	my $c_def =
907f8cea	359	"CREATE UNIQUE INDEX $name ON " . $index_table_name .
907f8cea	360	' (' . join( ', ', @fields ) . ')';
bfb5a568	361
	362	return $c_def;
	363	}
	364
d0fcb05d	365	sub create_trigger {
	366	my ($trigger, $options) = @_;
	367	my $add_drop = $options->{add_drop_trigger};
	368
	369	my $name = $trigger->name;
	370	my @create;
	371
	372	push @create, "DROP TRIGGER IF EXISTS $name" if $add_drop;
	373
	374	my $events = $trigger->database_events;
	375	die "Can't handle multiple events in triggers" if @$events > 1;
	376
	377	my $action = "";
d0fcb05d	378
f9c96971	379	$DB::single = 1;
	380	unless (ref $trigger->action) {
	381	$action .= "BEGIN " . $trigger->action . " END";
	382	} else {
	383	$action = $trigger->action->{for_each} . " "
	384	if $trigger->action->{for_each};
d0fcb05d	385
f9c96971	386	$action = $trigger->action->{when} . " "
f9c96971	387	if $trigger->action->{when};
d0fcb05d	388
f9c96971	389	my $steps = $trigger->action->{steps} \|\| [];
	390
	391	$action .= "BEGIN ";
	392	for (@$steps) {
	393	$action .= $_ . "; "
	394	}
	395	$action .= "END";
d0fcb05d	396	}
d0fcb05d	397
	398	push @create, "CREATE TRIGGER $name " .
	399	$trigger->perform_action_when . " " .
	400	$events->[0] .
	401	" on " . $trigger->on_table . " " .
	402	$action;
	403
	404	return @create;
	405
	406	}
	407
4d438549	408	sub alter_table { } # Noop
	409
	410	sub add_field {
	411	my ($field) = @_;
	412
	413	return sprintf("ALTER TABLE %s ADD COLUMN %s",
	414	$field->table->name, create_field($field))
	415	}
	416
	417	sub alter_create_index {
	418	my ($index) = @_;
	419
	420	# This might cause name collisions
	421	return create_index($index);
	422	}
	423
	424	sub alter_create_constraint {
	425	my ($constraint) = @_;
	426
	427	return create_constraint($constraint) if $constraint->type eq 'UNIQUE';
	428	}
	429
	430	sub alter_drop_constraint { alter_drop_index(@_) }
	431
	432	sub alter_drop_index {
	433	my ($constraint) = @_;
	434
ecf7f25d	435	return sprintf("DROP INDEX %s",
ecf7f25d	436	$constraint->name);
4d438549	437	}
	438
	439	sub batch_alter_table {
	440	my ($table, $diffs) = @_;
	441
4d438549	442	# If we have any of the following
	443	#
	444	# rename_field
	445	# alter_field
	446	# drop_field
	447	#
	448	# we need to do the following <http://www.sqlite.org/faq.html#q11>
	449	#
	450	# BEGIN TRANSACTION;
	451	# CREATE TEMPORARY TABLE t1_backup(a,b);
	452	# INSERT INTO t1_backup SELECT a,b FROM t1;
	453	# DROP TABLE t1;
	454	# CREATE TABLE t1(a,b);
	455	# INSERT INTO t1 SELECT a,b FROM t1_backup;
	456	# DROP TABLE t1_backup;
	457	# COMMIT;
	458	#
	459	# Fun, eh?
46bf5655	460	#
	461	# If we have rename_field we do similarly.
	462
	463	my $table_name = $table->name;
	464	my $renaming = $diffs->{rename_table} && @{$diffs->{rename_table}};
4d438549	465
	466	if ( @{$diffs->{rename_field}} == 0 &&
	467	@{$diffs->{alter_field}} == 0 &&
46bf5655	468	@{$diffs->{drop_field}} == 0
46bf5655	469	) {
24d9fe69	470	# return join("\n", map {
24d9fe69	471	return map {
4d438549	472	my $meth = __PACKAGE__->can($_) or die __PACKAGE__ . " cant $_";
24d9fe69	473	map { my $sql = $meth->(ref $_ eq 'ARRAY' ? @$_ : $_); $sql ? ("$sql") : () } @{ $diffs->{$_} }
4d438549	474
46bf5655	475	} grep { @{$diffs->{$_}} }
	476	qw/rename_table
	477	alter_drop_constraint
	478	alter_drop_index
	479	drop_field
	480	add_field
	481	alter_field
	482	rename_field
	483	alter_create_index
	484	alter_create_constraint
24d9fe69	485	alter_table/;
4d438549	486	}
	487
	488
	489	my @sql;
46bf5655	490	my $old_table = $renaming ? $diffs->{rename_table}[0][0] : $table;
4d438549	491
4d438549	492	do {
46bf5655	493	local $table->{name} = $table_name . '_temp_alter';
4d438549	494	# We only want the table - dont care about indexes on tmp table
	495	my ($table_sql) = create_table($table, {no_comments => 1, temporary_table => 1});
	496	push @sql,$table_sql;
	497	};
	498
46bf5655	499	push @sql, "INSERT INTO @{[$table_name]}_temp_alter SELECT @{[ join(', ', $old_table->get_fields)]} FROM @{[$old_table]}",
46bf5655	500	"DROP TABLE @{[$old_table]}",
4d438549	501	create_table($table, { no_comments => 1 }),
46bf5655	502	"INSERT INTO @{[$table_name]} SELECT @{[ join(', ', $old_table->get_fields)]} FROM @{[$table_name]}_temp_alter",
46bf5655	503	"DROP TABLE @{[$table_name]}_temp_alter";
4d438549	504
24d9fe69	505	return @sql;
24d9fe69	506	# return join("", @sql, "");
4d438549	507	}
	508
	509	sub drop_table {
	510	my ($table) = @_;
24d9fe69	511	return "DROP TABLE $table";
4d438549	512	}
4d438549	513
46bf5655	514	sub rename_table {
	515	my ($old_table, $new_table, $options) = @_;
	516
	517	my $qt = $options->{quote_table_names} \|\| '';
	518
	519	return "ALTER TABLE $qt$old_table$qt RENAME TO $qt$new_table$qt";
	520
	521	}
	522
934e1b39	523	# No-op. Just here to signify that we are a new style parser.
	524	sub preproces_schema { }
	525
bfb5a568	526	1;
758ab1cd	527
20770e44	528	=pod
	529
	530	=head1 SEE ALSO
	531
	532	SQL::Translator, http://www.sqlite.org/.
758ab1cd	533
	534	=head1 AUTHOR
	535
4d438549	536	Ken Y. Clark C<< <kclark@cpan.orgE> >>.
	537
	538	Diff code added by Ash Berlin C<< <ash@cpan.org> >>.
20770e44	539
20770e44	540	=cut