[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 Readonly;

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

$VERSION = '1.60';
$DEBUG   = 0 if !defined $DEBUG;
$WARN    = 0 if !defined $WARN;

Readonly my $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 E<lt>kclark@cpan.orgE<gt>.

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);
ba506e52	43	use Readonly;
758ab1cd	44
da06ac74	45	use vars qw[ $VERSION $DEBUG $WARN ];
5ee19df8	46
ba506e52	47	$VERSION = '1.60';
	48	$DEBUG = 0 if !defined $DEBUG;
	49	$WARN = 0 if !defined $WARN;
758ab1cd	50
ba506e52	51	Readonly my $MAX_ID_LENGTH => 30;
ae602737	52	my %global_names;
758ab1cd	53
758ab1cd	54	sub produce {
a1d94525	55	my $translator = shift;
	56	local $DEBUG = $translator->debug;
	57	local $WARN = $translator->show_warnings;
	58	my $no_comments = $translator->no_comments;
	59	my $add_drop_table = $translator->add_drop_table;
	60	my $schema = $translator->schema;
d12f72ff	61	my $producer_args = $translator->producer_args;
f9c96971	62	my $sqlite_version = $producer_args->{sqlite_version} \|\| 0;
f9c96971	63	my $no_txn = $producer_args->{no_transaction};
758ab1cd	64
1a24938d	65	debug("PKG: Beginning production\n");
758ab1cd	66
ae602737	67	%global_names = (); #reset
ae602737	68
24d9fe69	69	my @create = ();
24d9fe69	70	push @create, header_comment unless ($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 $no_txn;
	98	return join(";\n\n", @create );
	99	}
758ab1cd	100	}
758ab1cd	101
758ab1cd	102	# -------------------------------------------------------------------
758ab1cd	103	sub mk_name {
ae602737	104	my ($name, $scope, $critical) = @_;
758ab1cd	105
	106	$scope \|\|= \%global_names;
	107	if ( my $prev = $scope->{ $name } ) {
	108	my $name_orig = $name;
	109	$name .= sprintf( "%02d", ++$prev );
ba506e52	110	substr($name, $MAX_ID_LENGTH - 3) = "00"
ba506e52	111	if length( $name ) > $MAX_ID_LENGTH;
758ab1cd	112
	113	warn "The name '$name_orig' has been changed to ",
	114	"'$name' to make it unique.\n" if $WARN;
	115
	116	$scope->{ $name_orig }++;
	117	}
	118
	119	$scope->{ $name }++;
	120	return $name;
	121	}
	122
ec59a597	123	sub create_view {
ec59a597	124	my ($view, $options) = @_;
a25ac5d2	125	my $add_drop_view = $options->{add_drop_view};
ec59a597	126
	127	my $view_name = $view->name;
	128	debug("PKG: Looking at view '${view_name}'\n");
	129
	130	# Header. Should this look like what mysqldump produces?
	131	my $extra = $view->extra;
	132	my $create = '';
	133	$create .= "--\n-- View: ${view_name}\n--\n" unless $options->{no_comments};
a25ac5d2	134	$create .= "DROP VIEW IF EXISTS $view_name;\n" if $add_drop_view;
ec59a597	135	$create .= 'CREATE';
	136	$create .= " TEMPORARY" if exists($extra->{temporary}) && $extra->{temporary};
	137	$create .= ' VIEW';
	138	$create .= " IF NOT EXISTS" if exists($extra->{if_not_exists}) && $extra->{if_not_exists};
	139	$create .= " ${view_name}";
	140
	141	if( my $sql = $view->sql ){
a25ac5d2	142	$create .= " AS\n ${sql}";
ec59a597	143	}
ec59a597	144	return $create;
	145	}
	146
	147
bfb5a568	148	sub create_table
	149	{
	150	my ($table, $options) = @_;
758ab1cd	151
bfb5a568	152	my $table_name = $table->name;
	153	my $no_comments = $options->{no_comments};
	154	my $add_drop_table = $options->{add_drop_table};
3db73ef8	155	my $sqlite_version = $options->{sqlite_version} \|\| 0;
bfb5a568	156
	157	debug("PKG: Looking at table '$table_name'\n");
	158
d0fcb05d	159	my ( @index_defs, @constraint_defs );
bfb5a568	160	my @fields = $table->get_fields or die "No fields in $table_name";
bfb5a568	161
4d438549	162	my $temp = $options->{temporary_table} ? 'TEMPORARY ' : '';
bfb5a568	163	#
	164	# Header.
	165	#
d12f72ff	166	my $exists = ($sqlite_version >= 3.3) ? ' IF EXISTS' : '';
24d9fe69	167	my @create;
d0fcb05d	168	my ($comment, $create_table) = "";
	169	$comment = "--\n-- Table: $table_name\n--\n" unless $no_comments;
	170	if ($add_drop_table) {
	171	push @create, $comment . qq[DROP TABLE$exists $table_name];
	172	} else {
	173	$create_table = $comment;
	174	}
	175
	176	$create_table .= "CREATE ${temp}TABLE $table_name (\n";
bfb5a568	177
	178	#
	179	# Comments
	180	#
	181	if ( $table->comments and !$no_comments ){
24d9fe69	182	$create_table .= "-- Comments: \n-- ";
	183	$create_table .= join "\n-- ", $table->comments;
	184	$create_table .= "\n--\n\n";
bfb5a568	185	}
	186
	187	#
	188	# How many fields in PK?
	189	#
	190	my $pk = $table->primary_key;
	191	my @pk_fields = $pk ? $pk->fields : ();
	192
	193	#
	194	# Fields
	195	#
	196	my ( @field_defs, $pk_set );
	197	for my $field ( @fields ) {
	198	push @field_defs, create_field($field);
	199	}
	200
	201	if (
	202	scalar @pk_fields > 1
	203	\|\|
	204	( @pk_fields && !grep /INTEGER PRIMARY KEY/, @field_defs )
	205	) {
	206	push @field_defs, 'PRIMARY KEY (' . join(', ', @pk_fields ) . ')';
	207	}
	208
	209	#
	210	# Indices
	211	#
	212	my $idx_name_default = 'A';
	213	for my $index ( $table->get_indices ) {
	214	push @index_defs, create_index($index);
	215	}
	216
	217	#
	218	# Constraints
	219	#
	220	my $c_name_default = 'A';
	221	for my $c ( $table->get_constraints ) {
	222	next unless $c->type eq UNIQUE;
	223	push @constraint_defs, create_constraint($c);
	224	}
	225
24d9fe69	226	$create_table .= join(",\n", map { " $_" } @field_defs ) . "\n)";
bfb5a568	227
d0fcb05d	228	return (@create, $create_table, @index_defs, @constraint_defs );
bfb5a568	229	}
	230
	231	sub create_field
	232	{
	233	my ($field, $options) = @_;
	234
	235	my $field_name = $field->name;
	236	debug("PKG: Looking at field '$field_name'\n");
	237	my $field_comments = $field->comments
	238	? "-- " . $field->comments . "\n "
	239	: '';
	240
	241	my $field_def = $field_comments.$field_name;
	242
	243	# data type and size
	244	my $size = $field->size;
	245	my $data_type = $field->data_type;
	246	$data_type = 'varchar' if lc $data_type eq 'set';
	247	$data_type = 'blob' if lc $data_type eq 'bytea';
	248
	249	if ( lc $data_type =~ /(text\|blob)/i ) {
	250	$size = undef;
	251	}
	252
	253	# if ( $data_type =~ /timestamp/i ) {
	254	# push @trigger_defs,
	255	# "CREATE TRIGGER ts_${table_name} ".
	256	# "after insert on $table_name\n".
	257	# "begin\n".
	258	# " update $table_name set $field_name=timestamp() ".
	259	# "where id=new.id;\n".
	260	# "end;\n"
	261	# ;
	262	#
	263	# }
	264
	265	#
	266	# SQLite is generally typeless, but newer versions will
	267	# make a field autoincrement if it is declared as (and
	268	# only as) INTEGER PRIMARY KEY
	269	#
	270	my $pk = $field->table->primary_key;
	271	my @pk_fields = $pk ? $pk->fields : ();
	272
	273	if (
	274	$field->is_primary_key &&
	275	scalar @pk_fields == 1 &&
	276	(
	277	$data_type =~ /int(eger)?$/i
	278	\|\|
	279	( $data_type =~ /^number?$/i && $size !~ /,/ )
	280	)
	281	) {
	282	$data_type = 'INTEGER PRIMARY KEY';
	283	$size = undef;
	284	# $pk_set = 1;
	285	}
	286
	287	$field_def .= sprintf " %s%s", $data_type,
	288	( !$field->is_auto_increment && $size ) ? "($size)" : '';
	289
	290	# Null?
	291	$field_def .= ' NOT NULL' unless $field->is_nullable;
	292
293	# Default? XXX Need better quoting!
294	my $default = $field->default_value;
bc8e2aa1	295	if (defined $default) {
	296	SQL::Translator::Producer->_apply_default_value(
	297	\$field_def,
	298	$default,
	299	[
	300	'NULL' => \'NULL',
	301	'now()' => 'now()',
	302	'CURRENT_TIMESTAMP' => 'CURRENT_TIMESTAMP',
	303	],
	304	);
bfb5a568	305	}
	306
	307	return $field_def;
	308
	309	}
	310
	311	sub create_index
	312	{
	313	my ($index, $options) = @_;
	314
	315	my $name = $index->name;
ae602737	316	$name = mk_name($name);
4d438549	317
4d438549	318	my $type = $index->type eq 'UNIQUE' ? "UNIQUE " : '';
bfb5a568	319
	320	# strip any field size qualifiers as SQLite doesn't like these
	321	my @fields = map { s/\(\d+\)$//; $_ } $index->fields;
cc74bccc	322	(my $index_table_name = $index->table->name) =~ s/^.+?\.//; # table name may not specify schema
cc74bccc	323	warn "removing schema name from '" . $index->table->name . "' to make '$index_table_name'\n" if $WARN;
bfb5a568	324	my $index_def =
907f8cea	325	"CREATE ${type}INDEX $name ON " . $index_table_name .
907f8cea	326	' (' . join( ', ', @fields ) . ')';
bfb5a568	327
	328	return $index_def;
	329	}
	330
	331	sub create_constraint
	332	{
	333	my ($c, $options) = @_;
	334
	335	my $name = $c->name;
ae602737	336	$name = mk_name($name);
bfb5a568	337	my @fields = $c->fields;
cc74bccc	338	(my $index_table_name = $c->table->name) =~ s/^.+?\.//; # table name may not specify schema
cc74bccc	339	warn "removing schema name from '" . $c->table->name . "' to make '$index_table_name'\n" if $WARN;
bfb5a568	340
bfb5a568	341	my $c_def =
907f8cea	342	"CREATE UNIQUE INDEX $name ON " . $index_table_name .
907f8cea	343	' (' . join( ', ', @fields ) . ')';
bfb5a568	344
	345	return $c_def;
	346	}
	347
d0fcb05d	348	sub create_trigger {
	349	my ($trigger, $options) = @_;
	350	my $add_drop = $options->{add_drop_trigger};
	351
410d4a42	352	my @statements;
d0fcb05d	353
410d4a42	354	my $trigger_name = $trigger->name;
d0fcb05d	355	my $events = $trigger->database_events;
410d4a42	356	for my $evt ( @$events ) {
d0fcb05d	357
410d4a42	358	my $trig_name = $trigger_name;
	359	if (@$events > 1) {
	360	$trig_name .= "_$evt";
d0fcb05d	361
410d4a42	362	warn "Multiple database events supplied for trigger '$trigger_name', ",
	363	"creating trigger '$trig_name' for the '$evt' event.\n" if $WARN;
	364	}
d0fcb05d	365
410d4a42	366	push @statements, "DROP TRIGGER IF EXISTS $trig_name" if $add_drop;
d0fcb05d	367
f9c96971	368
410d4a42	369	$DB::single = 1;
	370	my $action = "";
	371	if (not ref $trigger->action) {
	372	$action .= "BEGIN " . $trigger->action . " END";
f9c96971	373	}
410d4a42	374	else {
	375	$action = $trigger->action->{for_each} . " "
	376	if $trigger->action->{for_each};
	377
	378	$action = $trigger->action->{when} . " "
	379	if $trigger->action->{when};
d0fcb05d	380
410d4a42	381	my $steps = $trigger->action->{steps} \|\| [];
	382
	383	$action .= "BEGIN ";
	384	$action .= $_ . "; " for (@$steps);
	385	$action .= "END";
	386	}
	387
	388	push @statements, sprintf (
	389	'CREATE TRIGGER %s %s %s on %s %s',
	390	$trig_name,
	391	$trigger->perform_action_when,
	392	$evt,
	393	$trigger->on_table,
	394	$action
	395	);
	396	}
d0fcb05d	397
410d4a42	398	return @statements;
d0fcb05d	399	}
d0fcb05d	400
4d438549	401	sub alter_table { } # Noop
	402
	403	sub add_field {
	404	my ($field) = @_;
	405
	406	return sprintf("ALTER TABLE %s ADD COLUMN %s",
	407	$field->table->name, create_field($field))
	408	}
	409
	410	sub alter_create_index {
	411	my ($index) = @_;
	412
	413	# This might cause name collisions
	414	return create_index($index);
	415	}
	416
	417	sub alter_create_constraint {
	418	my ($constraint) = @_;
	419
	420	return create_constraint($constraint) if $constraint->type eq 'UNIQUE';
	421	}
	422
	423	sub alter_drop_constraint { alter_drop_index(@_) }
	424
	425	sub alter_drop_index {
	426	my ($constraint) = @_;
	427
ecf7f25d	428	return sprintf("DROP INDEX %s",
ecf7f25d	429	$constraint->name);
4d438549	430	}
	431
	432	sub batch_alter_table {
	433	my ($table, $diffs) = @_;
	434
4d438549	435	# If we have any of the following
	436	#
	437	# rename_field
	438	# alter_field
	439	# drop_field
	440	#
	441	# we need to do the following <http://www.sqlite.org/faq.html#q11>
	442	#
	443	# BEGIN TRANSACTION;
	444	# CREATE TEMPORARY TABLE t1_backup(a,b);
	445	# INSERT INTO t1_backup SELECT a,b FROM t1;
	446	# DROP TABLE t1;
	447	# CREATE TABLE t1(a,b);
	448	# INSERT INTO t1 SELECT a,b FROM t1_backup;
	449	# DROP TABLE t1_backup;
	450	# COMMIT;
	451	#
	452	# Fun, eh?
46bf5655	453	#
	454	# If we have rename_field we do similarly.
	455
	456	my $table_name = $table->name;
	457	my $renaming = $diffs->{rename_table} && @{$diffs->{rename_table}};
4d438549	458
	459	if ( @{$diffs->{rename_field}} == 0 &&
	460	@{$diffs->{alter_field}} == 0 &&
46bf5655	461	@{$diffs->{drop_field}} == 0
46bf5655	462	) {
24d9fe69	463	# return join("\n", map {
24d9fe69	464	return map {
4d438549	465	my $meth = __PACKAGE__->can($_) or die __PACKAGE__ . " cant $_";
24d9fe69	466	map { my $sql = $meth->(ref $_ eq 'ARRAY' ? @$_ : $_); $sql ? ("$sql") : () } @{ $diffs->{$_} }
4d438549	467
46bf5655	468	} grep { @{$diffs->{$_}} }
	469	qw/rename_table
	470	alter_drop_constraint
	471	alter_drop_index
	472	drop_field
	473	add_field
	474	alter_field
	475	rename_field
	476	alter_create_index
	477	alter_create_constraint
24d9fe69	478	alter_table/;
4d438549	479	}
	480
	481
	482	my @sql;
46bf5655	483	my $old_table = $renaming ? $diffs->{rename_table}[0][0] : $table;
4d438549	484
4d438549	485	do {
46bf5655	486	local $table->{name} = $table_name . '_temp_alter';
4d438549	487	# We only want the table - dont care about indexes on tmp table
	488	my ($table_sql) = create_table($table, {no_comments => 1, temporary_table => 1});
	489	push @sql,$table_sql;
	490	};
	491
46bf5655	492	push @sql, "INSERT INTO @{[$table_name]}_temp_alter SELECT @{[ join(', ', $old_table->get_fields)]} FROM @{[$old_table]}",
46bf5655	493	"DROP TABLE @{[$old_table]}",
4d438549	494	create_table($table, { no_comments => 1 }),
46bf5655	495	"INSERT INTO @{[$table_name]} SELECT @{[ join(', ', $old_table->get_fields)]} FROM @{[$table_name]}_temp_alter",
46bf5655	496	"DROP TABLE @{[$table_name]}_temp_alter";
4d438549	497
24d9fe69	498	return @sql;
24d9fe69	499	# return join("", @sql, "");
4d438549	500	}
	501
	502	sub drop_table {
	503	my ($table) = @_;
24d9fe69	504	return "DROP TABLE $table";
4d438549	505	}
4d438549	506
46bf5655	507	sub rename_table {
	508	my ($old_table, $new_table, $options) = @_;
	509
	510	my $qt = $options->{quote_table_names} \|\| '';
	511
	512	return "ALTER TABLE $qt$old_table$qt RENAME TO $qt$new_table$qt";
	513
	514	}
	515
934e1b39	516	# No-op. Just here to signify that we are a new style parser.
	517	sub preproces_schema { }
	518
bfb5a568	519	1;
758ab1cd	520
20770e44	521	=pod
	522
	523	=head1 SEE ALSO
	524
	525	SQL::Translator, http://www.sqlite.org/.
758ab1cd	526
	527	=head1 AUTHOR
	528
ba506e52	529	Ken Youens-Clark E<lt>kclark@cpan.orgE<gt>.
4d438549	530
4d438549	531	Diff code added by Ash Berlin C<< <ash@cpan.org> >>.
20770e44	532
20770e44	533	=cut