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

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

# -------------------------------------------------------------------
# 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 = '1.59';
$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 = $producer_args->{sqlite_version} || 0;
    my $no_txn         = $producer_args->{no_transaction};

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

    %global_names = ();   #reset

    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 ($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 $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;
    $name      = mk_name($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;
    $name      = mk_name($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 @statements;

  my $trigger_name = $trigger->name;
  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;
    }

    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,
      $trigger->on_table,
      $action
    );
  }

  return @statements;
}

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 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;
	2
	3	# -------------------------------------------------------------------
478f608d	4	# Copyright (C) 2002-2009 SQLFairy Authors
758ab1cd	5	#
	6	# This program is free software; you can redistribute it and/or
	7	# modify it under the terms of the GNU General Public License as
	8	# published by the Free Software Foundation; version 2.
	9	#
	10	# This program is distributed in the hope that it will be useful, but
	11	# WITHOUT ANY WARRANTY; without even the implied warranty of
	12	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	# General Public License for more details.
	14	#
	15	# You should have received a copy of the GNU General Public License
	16	# along with this program; if not, write to the Free Software
	17	# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	18	# 02111-1307 USA
	19	# -------------------------------------------------------------------
	20
20770e44	21	=head1 NAME
	22
	23	SQL::Translator::Producer::SQLite - SQLite producer for SQL::Translator
	24
	25	=head1 SYNOPSIS
	26
	27	use SQL::Translator;
	28
	29	my $t = SQL::Translator->new( parser => '...', producer => 'SQLite' );
	30	$t->translate;
	31
	32	=head1 DESCRIPTION
	33
	34	This module will produce text output of the schema suitable for SQLite.
	35
	36	=cut
	37
758ab1cd	38	use strict;
d0fcb05d	39	use warnings;
758ab1cd	40	use Data::Dumper;
b21bf652	41	use SQL::Translator::Schema::Constants;
5ee19df8	42	use SQL::Translator::Utils qw(debug header_comment);
758ab1cd	43
da06ac74	44	use vars qw[ $VERSION $DEBUG $WARN ];
5ee19df8	45
11ad2df9	46	$VERSION = '1.59';
	47	$DEBUG = 0 unless defined $DEBUG;
	48	$WARN = 0 unless defined $WARN;
758ab1cd	49
11ad2df9	50	our $max_id_length = 30;
ae602737	51	my %global_names;
758ab1cd	52
758ab1cd	53	sub produce {
a1d94525	54	my $translator = shift;
	55	local $DEBUG = $translator->debug;
	56	local $WARN = $translator->show_warnings;
	57	my $no_comments = $translator->no_comments;
	58	my $add_drop_table = $translator->add_drop_table;
	59	my $schema = $translator->schema;
d12f72ff	60	my $producer_args = $translator->producer_args;
f9c96971	61	my $sqlite_version = $producer_args->{sqlite_version} \|\| 0;
f9c96971	62	my $no_txn = $producer_args->{no_transaction};
758ab1cd	63
1a24938d	64	debug("PKG: Beginning production\n");
758ab1cd	65
ae602737	66	%global_names = (); #reset
ae602737	67
24d9fe69	68	my @create = ();
24d9fe69	69	push @create, header_comment unless ($no_comments);
f9c96971	70	$create[0] .= "\n\nBEGIN TRANSACTION" unless $no_txn;
758ab1cd	71
b21bf652	72	for my $table ( $schema->get_tables ) {
24d9fe69	73	push @create, create_table($table, { no_comments => $no_comments,
d12f72ff	74	sqlite_version => $sqlite_version,
4d438549	75	add_drop_table => $add_drop_table,});
a5a882f0	76	}
a5a882f0	77
ec59a597	78	for my $view ( $schema->get_views ) {
24d9fe69	79	push @create, create_view($view, {
a25ac5d2	80	add_drop_view => $add_drop_table,
	81	no_comments => $no_comments,
	82	});
ec59a597	83	}
ec59a597	84
d0fcb05d	85	for my $trigger ( $schema->get_triggers ) {
	86	push @create, create_trigger($trigger, {
	87	add_drop_trigger => $add_drop_table,
	88	no_comments => $no_comments,
	89	});
	90	}
	91
f9c96971	92	if (wantarray) {
	93	push @create, "COMMIT" unless $no_txn;
	94	return @create;
	95	} else {
	96	push @create, "COMMIT;\n" unless $no_txn;
	97	return join(";\n\n", @create );
	98	}
758ab1cd	99	}
758ab1cd	100
758ab1cd	101	# -------------------------------------------------------------------
758ab1cd	102	sub mk_name {
ae602737	103	my ($name, $scope, $critical) = @_;
758ab1cd	104
	105	$scope \|\|= \%global_names;
	106	if ( my $prev = $scope->{ $name } ) {
	107	my $name_orig = $name;
	108	$name .= sprintf( "%02d", ++$prev );
11ad2df9	109	substr($name, $max_id_length - 3) = "00"
11ad2df9	110	if length( $name ) > $max_id_length;
758ab1cd	111
	112	warn "The name '$name_orig' has been changed to ",
	113	"'$name' to make it unique.\n" if $WARN;
	114
	115	$scope->{ $name_orig }++;
	116	}
	117
	118	$scope->{ $name }++;
	119	return $name;
	120	}
	121
ec59a597	122	sub create_view {
ec59a597	123	my ($view, $options) = @_;
a25ac5d2	124	my $add_drop_view = $options->{add_drop_view};
ec59a597	125
	126	my $view_name = $view->name;
	127	debug("PKG: Looking at view '${view_name}'\n");
	128
	129	# Header. Should this look like what mysqldump produces?
	130	my $extra = $view->extra;
	131	my $create = '';
	132	$create .= "--\n-- View: ${view_name}\n--\n" unless $options->{no_comments};
a25ac5d2	133	$create .= "DROP VIEW IF EXISTS $view_name;\n" if $add_drop_view;
ec59a597	134	$create .= 'CREATE';
	135	$create .= " TEMPORARY" if exists($extra->{temporary}) && $extra->{temporary};
	136	$create .= ' VIEW';
	137	$create .= " IF NOT EXISTS" if exists($extra->{if_not_exists}) && $extra->{if_not_exists};
	138	$create .= " ${view_name}";
	139
	140	if( my $sql = $view->sql ){
a25ac5d2	141	$create .= " AS\n ${sql}";
ec59a597	142	}
ec59a597	143	return $create;
	144	}
	145
	146
bfb5a568	147	sub create_table
	148	{
	149	my ($table, $options) = @_;
758ab1cd	150
bfb5a568	151	my $table_name = $table->name;
	152	my $no_comments = $options->{no_comments};
	153	my $add_drop_table = $options->{add_drop_table};
3db73ef8	154	my $sqlite_version = $options->{sqlite_version} \|\| 0;
bfb5a568	155
	156	debug("PKG: Looking at table '$table_name'\n");
	157
d0fcb05d	158	my ( @index_defs, @constraint_defs );
bfb5a568	159	my @fields = $table->get_fields or die "No fields in $table_name";
bfb5a568	160
4d438549	161	my $temp = $options->{temporary_table} ? 'TEMPORARY ' : '';
bfb5a568	162	#
	163	# Header.
	164	#
d12f72ff	165	my $exists = ($sqlite_version >= 3.3) ? ' IF EXISTS' : '';
24d9fe69	166	my @create;
d0fcb05d	167	my ($comment, $create_table) = "";
	168	$comment = "--\n-- Table: $table_name\n--\n" unless $no_comments;
	169	if ($add_drop_table) {
	170	push @create, $comment . qq[DROP TABLE$exists $table_name];
	171	} else {
	172	$create_table = $comment;
	173	}
	174
	175	$create_table .= "CREATE ${temp}TABLE $table_name (\n";
bfb5a568	176
	177	#
	178	# Comments
	179	#
	180	if ( $table->comments and !$no_comments ){
24d9fe69	181	$create_table .= "-- Comments: \n-- ";
	182	$create_table .= join "\n-- ", $table->comments;
	183	$create_table .= "\n--\n\n";
bfb5a568	184	}
	185
	186	#
	187	# How many fields in PK?
	188	#
	189	my $pk = $table->primary_key;
	190	my @pk_fields = $pk ? $pk->fields : ();
	191
	192	#
	193	# Fields
	194	#
	195	my ( @field_defs, $pk_set );
	196	for my $field ( @fields ) {
	197	push @field_defs, create_field($field);
	198	}
	199
	200	if (
	201	scalar @pk_fields > 1
	202	\|\|
	203	( @pk_fields && !grep /INTEGER PRIMARY KEY/, @field_defs )
	204	) {
	205	push @field_defs, 'PRIMARY KEY (' . join(', ', @pk_fields ) . ')';
	206	}
	207
	208	#
	209	# Indices
	210	#
	211	my $idx_name_default = 'A';
	212	for my $index ( $table->get_indices ) {
	213	push @index_defs, create_index($index);
	214	}
	215
	216	#
	217	# Constraints
	218	#
	219	my $c_name_default = 'A';
	220	for my $c ( $table->get_constraints ) {
	221	next unless $c->type eq UNIQUE;
	222	push @constraint_defs, create_constraint($c);
	223	}
	224
24d9fe69	225	$create_table .= join(",\n", map { " $_" } @field_defs ) . "\n)";
bfb5a568	226
d0fcb05d	227	return (@create, $create_table, @index_defs, @constraint_defs );
bfb5a568	228	}
	229
	230	sub create_field
	231	{
	232	my ($field, $options) = @_;
	233
	234	my $field_name = $field->name;
	235	debug("PKG: Looking at field '$field_name'\n");
	236	my $field_comments = $field->comments
	237	? "-- " . $field->comments . "\n "
	238	: '';
	239
	240	my $field_def = $field_comments.$field_name;
	241
	242	# data type and size
	243	my $size = $field->size;
	244	my $data_type = $field->data_type;
	245	$data_type = 'varchar' if lc $data_type eq 'set';
	246	$data_type = 'blob' if lc $data_type eq 'bytea';
	247
	248	if ( lc $data_type =~ /(text\|blob)/i ) {
	249	$size = undef;
	250	}
	251
	252	# if ( $data_type =~ /timestamp/i ) {
	253	# push @trigger_defs,
	254	# "CREATE TRIGGER ts_${table_name} ".
	255	# "after insert on $table_name\n".
	256	# "begin\n".
	257	# " update $table_name set $field_name=timestamp() ".
	258	# "where id=new.id;\n".
	259	# "end;\n"
	260	# ;
	261	#
	262	# }
	263
	264	#
	265	# SQLite is generally typeless, but newer versions will
	266	# make a field autoincrement if it is declared as (and
	267	# only as) INTEGER PRIMARY KEY
	268	#
	269	my $pk = $field->table->primary_key;
	270	my @pk_fields = $pk ? $pk->fields : ();
	271
	272	if (
	273	$field->is_primary_key &&
	274	scalar @pk_fields == 1 &&
	275	(
	276	$data_type =~ /int(eger)?$/i
	277	\|\|
	278	( $data_type =~ /^number?$/i && $size !~ /,/ )
	279	)
	280	) {
	281	$data_type = 'INTEGER PRIMARY KEY';
	282	$size = undef;
	283	# $pk_set = 1;
	284	}
	285
	286	$field_def .= sprintf " %s%s", $data_type,
	287	( !$field->is_auto_increment && $size ) ? "($size)" : '';
	288
	289	# Null?
	290	$field_def .= ' NOT NULL' unless $field->is_nullable;
	291
292	# Default? XXX Need better quoting!
293	my $default = $field->default_value;
bc8e2aa1	294	if (defined $default) {
	295	SQL::Translator::Producer->_apply_default_value(
	296	\$field_def,
	297	$default,
	298	[
	299	'NULL' => \'NULL',
	300	'now()' => 'now()',
	301	'CURRENT_TIMESTAMP' => 'CURRENT_TIMESTAMP',
	302	],
	303	);
bfb5a568	304	}
	305
	306	return $field_def;
	307
	308	}
	309
	310	sub create_index
	311	{
	312	my ($index, $options) = @_;
	313
	314	my $name = $index->name;
ae602737	315	$name = mk_name($name);
4d438549	316
4d438549	317	my $type = $index->type eq 'UNIQUE' ? "UNIQUE " : '';
bfb5a568	318
	319	# strip any field size qualifiers as SQLite doesn't like these
	320	my @fields = map { s/\(\d+\)$//; $_ } $index->fields;
cc74bccc	321	(my $index_table_name = $index->table->name) =~ s/^.+?\.//; # table name may not specify schema
cc74bccc	322	warn "removing schema name from '" . $index->table->name . "' to make '$index_table_name'\n" if $WARN;
bfb5a568	323	my $index_def =
907f8cea	324	"CREATE ${type}INDEX $name ON " . $index_table_name .
907f8cea	325	' (' . join( ', ', @fields ) . ')';
bfb5a568	326
	327	return $index_def;
	328	}
	329
	330	sub create_constraint
	331	{
	332	my ($c, $options) = @_;
	333
	334	my $name = $c->name;
ae602737	335	$name = mk_name($name);
bfb5a568	336	my @fields = $c->fields;
cc74bccc	337	(my $index_table_name = $c->table->name) =~ s/^.+?\.//; # table name may not specify schema
cc74bccc	338	warn "removing schema name from '" . $c->table->name . "' to make '$index_table_name'\n" if $WARN;
bfb5a568	339
bfb5a568	340	my $c_def =
907f8cea	341	"CREATE UNIQUE INDEX $name ON " . $index_table_name .
907f8cea	342	' (' . join( ', ', @fields ) . ')';
bfb5a568	343
	344	return $c_def;
	345	}
	346
d0fcb05d	347	sub create_trigger {
	348	my ($trigger, $options) = @_;
	349	my $add_drop = $options->{add_drop_trigger};
	350
410d4a42	351	my @statements;
d0fcb05d	352
410d4a42	353	my $trigger_name = $trigger->name;
d0fcb05d	354	my $events = $trigger->database_events;
410d4a42	355	for my $evt ( @$events ) {
d0fcb05d	356
410d4a42	357	my $trig_name = $trigger_name;
	358	if (@$events > 1) {
	359	$trig_name .= "_$evt";
d0fcb05d	360
410d4a42	361	warn "Multiple database events supplied for trigger '$trigger_name', ",
	362	"creating trigger '$trig_name' for the '$evt' event.\n" if $WARN;
	363	}
d0fcb05d	364
410d4a42	365	push @statements, "DROP TRIGGER IF EXISTS $trig_name" if $add_drop;
d0fcb05d	366
f9c96971	367
410d4a42	368	$DB::single = 1;
	369	my $action = "";
	370	if (not ref $trigger->action) {
	371	$action .= "BEGIN " . $trigger->action . " END";
f9c96971	372	}
410d4a42	373	else {
	374	$action = $trigger->action->{for_each} . " "
	375	if $trigger->action->{for_each};
	376
	377	$action = $trigger->action->{when} . " "
	378	if $trigger->action->{when};
d0fcb05d	379
410d4a42	380	my $steps = $trigger->action->{steps} \|\| [];
	381
	382	$action .= "BEGIN ";
	383	$action .= $_ . "; " for (@$steps);
	384	$action .= "END";
	385	}
	386
	387	push @statements, sprintf (
	388	'CREATE TRIGGER %s %s %s on %s %s',
	389	$trig_name,
	390	$trigger->perform_action_when,
	391	$evt,
	392	$trigger->on_table,
	393	$action
	394	);
	395	}
d0fcb05d	396
410d4a42	397	return @statements;
d0fcb05d	398	}
d0fcb05d	399
4d438549	400	sub alter_table { } # Noop
	401
	402	sub add_field {
	403	my ($field) = @_;
	404
	405	return sprintf("ALTER TABLE %s ADD COLUMN %s",
	406	$field->table->name, create_field($field))
	407	}
	408
	409	sub alter_create_index {
	410	my ($index) = @_;
	411
	412	# This might cause name collisions
	413	return create_index($index);
	414	}
	415
	416	sub alter_create_constraint {
	417	my ($constraint) = @_;
	418
	419	return create_constraint($constraint) if $constraint->type eq 'UNIQUE';
	420	}
	421
	422	sub alter_drop_constraint { alter_drop_index(@_) }
	423
	424	sub alter_drop_index {
	425	my ($constraint) = @_;
	426
ecf7f25d	427	return sprintf("DROP INDEX %s",
ecf7f25d	428	$constraint->name);
4d438549	429	}
	430
	431	sub batch_alter_table {
	432	my ($table, $diffs) = @_;
	433
4d438549	434	# If we have any of the following
	435	#
	436	# rename_field
	437	# alter_field
	438	# drop_field
	439	#
	440	# we need to do the following <http://www.sqlite.org/faq.html#q11>
	441	#
	442	# BEGIN TRANSACTION;
	443	# CREATE TEMPORARY TABLE t1_backup(a,b);
	444	# INSERT INTO t1_backup SELECT a,b FROM t1;
	445	# DROP TABLE t1;
	446	# CREATE TABLE t1(a,b);
	447	# INSERT INTO t1 SELECT a,b FROM t1_backup;
	448	# DROP TABLE t1_backup;
	449	# COMMIT;
	450	#
	451	# Fun, eh?
46bf5655	452	#
	453	# If we have rename_field we do similarly.
	454
	455	my $table_name = $table->name;
	456	my $renaming = $diffs->{rename_table} && @{$diffs->{rename_table}};
4d438549	457
	458	if ( @{$diffs->{rename_field}} == 0 &&
	459	@{$diffs->{alter_field}} == 0 &&
46bf5655	460	@{$diffs->{drop_field}} == 0
46bf5655	461	) {
24d9fe69	462	# return join("\n", map {
24d9fe69	463	return map {
4d438549	464	my $meth = __PACKAGE__->can($_) or die __PACKAGE__ . " cant $_";
24d9fe69	465	map { my $sql = $meth->(ref $_ eq 'ARRAY' ? @$_ : $_); $sql ? ("$sql") : () } @{ $diffs->{$_} }
4d438549	466
46bf5655	467	} grep { @{$diffs->{$_}} }
	468	qw/rename_table
	469	alter_drop_constraint
	470	alter_drop_index
	471	drop_field
	472	add_field
	473	alter_field
	474	rename_field
	475	alter_create_index
	476	alter_create_constraint
24d9fe69	477	alter_table/;
4d438549	478	}
	479
	480
	481	my @sql;
46bf5655	482	my $old_table = $renaming ? $diffs->{rename_table}[0][0] : $table;
4d438549	483
4d438549	484	do {
46bf5655	485	local $table->{name} = $table_name . '_temp_alter';
4d438549	486	# We only want the table - dont care about indexes on tmp table
	487	my ($table_sql) = create_table($table, {no_comments => 1, temporary_table => 1});
	488	push @sql,$table_sql;
	489	};
	490
46bf5655	491	push @sql, "INSERT INTO @{[$table_name]}_temp_alter SELECT @{[ join(', ', $old_table->get_fields)]} FROM @{[$old_table]}",
46bf5655	492	"DROP TABLE @{[$old_table]}",
4d438549	493	create_table($table, { no_comments => 1 }),
46bf5655	494	"INSERT INTO @{[$table_name]} SELECT @{[ join(', ', $old_table->get_fields)]} FROM @{[$table_name]}_temp_alter",
46bf5655	495	"DROP TABLE @{[$table_name]}_temp_alter";
4d438549	496
24d9fe69	497	return @sql;
24d9fe69	498	# return join("", @sql, "");
4d438549	499	}
	500
	501	sub drop_table {
	502	my ($table) = @_;
24d9fe69	503	return "DROP TABLE $table";
4d438549	504	}
4d438549	505
46bf5655	506	sub rename_table {
	507	my ($old_table, $new_table, $options) = @_;
	508
	509	my $qt = $options->{quote_table_names} \|\| '';
	510
	511	return "ALTER TABLE $qt$old_table$qt RENAME TO $qt$new_table$qt";
	512
	513	}
	514
934e1b39	515	# No-op. Just here to signify that we are a new style parser.
	516	sub preproces_schema { }
	517
bfb5a568	518	1;
758ab1cd	519
20770e44	520	=pod
	521
	522	=head1 SEE ALSO
	523
	524	SQL::Translator, http://www.sqlite.org/.
758ab1cd	525
	526	=head1 AUTHOR
	527
11ad2df9	528	Ken Youens-Clark C<< <kclark@cpan.orgE> >>.
4d438549	529
4d438549	530	Diff code added by Ash Berlin C<< <ash@cpan.org> >>.
20770e44	531
20770e44	532	=cut