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

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

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

=head1 NAME

SQL::Translator::Producer::SQLite - SQLite producer for SQL::Translator

=head1 SYNOPSIS

  use SQL::Translator;

  my $t = SQL::Translator->new( parser => '...', producer => 'SQLite' );
  $t->translate;

=head1 DESCRIPTION

This module will produce text output of the schema suitable for SQLite.

=cut

use strict;
use 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;

my %used_identifiers = ();
my $max_id_length    = 30;
my %global_names;
my %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;

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

    my @create = ();
    push @create, header_comment unless ($no_comments);
    push @create, 'BEGIN TRANSACTION';

    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,
      });
    }

    return wantarray ? (@create, "COMMIT") : join(";\n\n", (@create, "COMMIT;\n"));
}

# -------------------------------------------------------------------
sub mk_name {
    my ($basename, $type, $scope, $critical) = @_;
    my $basename_orig = $basename;
    my $max_name      = $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, @trigger_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;
    push @create, "--\n-- Table: $table_name\n--\n" unless $no_comments;
    push @create, qq[DROP TABLE$exists $table_name] if $add_drop_table;
    my $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, @trigger_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 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	# -------------------------------------------------------------------
821a0fde	4	# $Id$
758ab1cd	5	# -------------------------------------------------------------------
478f608d	6	# Copyright (C) 2002-2009 SQLFairy Authors
758ab1cd	7	#
	8	# This program is free software; you can redistribute it and/or
	9	# modify it under the terms of the GNU General Public License as
	10	# published by the Free Software Foundation; version 2.
	11	#
	12	# This program is distributed in the hope that it will be useful, but
	13	# WITHOUT ANY WARRANTY; without even the implied warranty of
	14	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	# General Public License for more details.
	16	#
	17	# You should have received a copy of the GNU General Public License
	18	# along with this program; if not, write to the Free Software
	19	# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	20	# 02111-1307 USA
	21	# -------------------------------------------------------------------
	22
20770e44	23	=head1 NAME
	24
	25	SQL::Translator::Producer::SQLite - SQLite producer for SQL::Translator
	26
	27	=head1 SYNOPSIS
	28
	29	use SQL::Translator;
	30
	31	my $t = SQL::Translator->new( parser => '...', producer => 'SQLite' );
	32	$t->translate;
	33
	34	=head1 DESCRIPTION
	35
	36	This module will produce text output of the schema suitable for SQLite.
	37
	38	=cut
	39
758ab1cd	40	use strict;
758ab1cd	41	use Data::Dumper;
b21bf652	42	use SQL::Translator::Schema::Constants;
5ee19df8	43	use SQL::Translator::Utils qw(debug header_comment);
758ab1cd	44
478f608d	45	use vars qw[ $DEBUG $WARN ];
5ee19df8	46
5ee19df8	47	$DEBUG = 0 unless defined $DEBUG;
5ee19df8	48	$WARN = 0 unless defined $WARN;
758ab1cd	49
	50	my %used_identifiers = ();
	51	my $max_id_length = 30;
	52	my %global_names;
	53	my %truncated;
	54
758ab1cd	55	sub produce {
a1d94525	56	my $translator = shift;
	57	local $DEBUG = $translator->debug;
	58	local $WARN = $translator->show_warnings;
	59	my $no_comments = $translator->no_comments;
	60	my $add_drop_table = $translator->add_drop_table;
	61	my $schema = $translator->schema;
d12f72ff	62	my $producer_args = $translator->producer_args;
d12f72ff	63	my $sqlite_version = $producer_args->{sqlite_version} \|\| 0;
758ab1cd	64
1a24938d	65	debug("PKG: Beginning production\n");
758ab1cd	66
24d9fe69	67	my @create = ();
	68	push @create, header_comment unless ($no_comments);
	69	push @create, 'BEGIN TRANSACTION';
758ab1cd	70
b21bf652	71	for my $table ( $schema->get_tables ) {
24d9fe69	72	push @create, create_table($table, { no_comments => $no_comments,
d12f72ff	73	sqlite_version => $sqlite_version,
4d438549	74	add_drop_table => $add_drop_table,});
a5a882f0	75	}
a5a882f0	76
ec59a597	77	for my $view ( $schema->get_views ) {
24d9fe69	78	push @create, create_view($view, {
a25ac5d2	79	add_drop_view => $add_drop_table,
	80	no_comments => $no_comments,
	81	});
ec59a597	82	}
ec59a597	83
24d9fe69	84	return wantarray ? (@create, "COMMIT") : join(";\n\n", (@create, "COMMIT;\n"));
758ab1cd	85	}
758ab1cd	86
758ab1cd	87	# -------------------------------------------------------------------
	88	sub mk_name {
	89	my ($basename, $type, $scope, $critical) = @_;
	90	my $basename_orig = $basename;
	91	my $max_name = $type
	92	? $max_id_length - (length($type) + 1)
	93	: $max_id_length;
	94	$basename = substr( $basename, 0, $max_name )
	95	if length( $basename ) > $max_name;
cc74bccc	96	$basename =~ s/\./_/g;
758ab1cd	97	my $name = $type ? "${type}_$basename" : $basename;
	98
	99	if ( $basename ne $basename_orig and $critical ) {
	100	my $show_type = $type ? "+'$type'" : "";
	101	warn "Truncating '$basename_orig'$show_type to $max_id_length ",
	102	"character limit to make '$name'\n" if $WARN;
	103	$truncated{ $basename_orig } = $name;
	104	}
	105
	106	$scope \|\|= \%global_names;
	107	if ( my $prev = $scope->{ $name } ) {
	108	my $name_orig = $name;
	109	$name .= sprintf( "%02d", ++$prev );
	110	substr($name, $max_id_length - 3) = "00"
	111	if length( $name ) > $max_id_length;
	112
	113	warn "The name '$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
	159	my ( @index_defs, @constraint_defs, @trigger_defs );
	160	my @fields = $table->get_fields or die "No fields in $table_name";
	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;
24d9fe69	168	push @create, "--\n-- Table: $table_name\n--\n" unless $no_comments;
d12f72ff	169	push @create, qq[DROP TABLE$exists $table_name] if $add_drop_table;
24d9fe69	170	my $create_table = "CREATE ${temp}TABLE $table_name (\n";
bfb5a568	171
	172	#
	173	# Comments
	174	#
	175	if ( $table->comments and !$no_comments ){
24d9fe69	176	$create_table .= "-- Comments: \n-- ";
	177	$create_table .= join "\n-- ", $table->comments;
	178	$create_table .= "\n--\n\n";
bfb5a568	179	}
	180
	181	#
	182	# How many fields in PK?
	183	#
	184	my $pk = $table->primary_key;
	185	my @pk_fields = $pk ? $pk->fields : ();
	186
	187	#
	188	# Fields
	189	#
	190	my ( @field_defs, $pk_set );
	191	for my $field ( @fields ) {
	192	push @field_defs, create_field($field);
	193	}
	194
	195	if (
	196	scalar @pk_fields > 1
	197	\|\|
	198	( @pk_fields && !grep /INTEGER PRIMARY KEY/, @field_defs )
	199	) {
	200	push @field_defs, 'PRIMARY KEY (' . join(', ', @pk_fields ) . ')';
	201	}
	202
	203	#
	204	# Indices
	205	#
	206	my $idx_name_default = 'A';
	207	for my $index ( $table->get_indices ) {
	208	push @index_defs, create_index($index);
	209	}
	210
	211	#
	212	# Constraints
	213	#
	214	my $c_name_default = 'A';
	215	for my $c ( $table->get_constraints ) {
	216	next unless $c->type eq UNIQUE;
	217	push @constraint_defs, create_constraint($c);
	218	}
	219
24d9fe69	220	$create_table .= join(",\n", map { " $_" } @field_defs ) . "\n)";
bfb5a568	221
24d9fe69	222	return (@create, $create_table, @index_defs, @constraint_defs, @trigger_defs );
bfb5a568	223	}
	224
	225	sub create_field
	226	{
	227	my ($field, $options) = @_;
	228
	229	my $field_name = $field->name;
	230	debug("PKG: Looking at field '$field_name'\n");
	231	my $field_comments = $field->comments
	232	? "-- " . $field->comments . "\n "
	233	: '';
	234
	235	my $field_def = $field_comments.$field_name;
	236
	237	# data type and size
	238	my $size = $field->size;
	239	my $data_type = $field->data_type;
	240	$data_type = 'varchar' if lc $data_type eq 'set';
	241	$data_type = 'blob' if lc $data_type eq 'bytea';
	242
	243	if ( lc $data_type =~ /(text\|blob)/i ) {
	244	$size = undef;
	245	}
	246
	247	# if ( $data_type =~ /timestamp/i ) {
	248	# push @trigger_defs,
	249	# "CREATE TRIGGER ts_${table_name} ".
	250	# "after insert on $table_name\n".
	251	# "begin\n".
	252	# " update $table_name set $field_name=timestamp() ".
	253	# "where id=new.id;\n".
	254	# "end;\n"
	255	# ;
	256	#
	257	# }
	258
	259	#
	260	# SQLite is generally typeless, but newer versions will
	261	# make a field autoincrement if it is declared as (and
	262	# only as) INTEGER PRIMARY KEY
	263	#
	264	my $pk = $field->table->primary_key;
	265	my @pk_fields = $pk ? $pk->fields : ();
	266
	267	if (
	268	$field->is_primary_key &&
	269	scalar @pk_fields == 1 &&
	270	(
	271	$data_type =~ /int(eger)?$/i
	272	\|\|
	273	( $data_type =~ /^number?$/i && $size !~ /,/ )
	274	)
	275	) {
	276	$data_type = 'INTEGER PRIMARY KEY';
	277	$size = undef;
	278	# $pk_set = 1;
	279	}
	280
	281	$field_def .= sprintf " %s%s", $data_type,
	282	( !$field->is_auto_increment && $size ) ? "($size)" : '';
	283
	284	# Null?
	285	$field_def .= ' NOT NULL' unless $field->is_nullable;
	286
287	# Default? XXX Need better quoting!
288	my $default = $field->default_value;
bc8e2aa1	289	if (defined $default) {
	290	SQL::Translator::Producer->_apply_default_value(
	291	\$field_def,
	292	$default,
	293	[
	294	'NULL' => \'NULL',
	295	'now()' => 'now()',
	296	'CURRENT_TIMESTAMP' => 'CURRENT_TIMESTAMP',
	297	],
	298	);
bfb5a568	299	}
	300
	301	return $field_def;
	302
	303	}
	304
	305	sub create_index
	306	{
	307	my ($index, $options) = @_;
	308
	309	my $name = $index->name;
4d438549	310	$name = mk_name($index->table->name, $name);
	311
	312	my $type = $index->type eq 'UNIQUE' ? "UNIQUE " : '';
bfb5a568	313
	314	# strip any field size qualifiers as SQLite doesn't like these
	315	my @fields = map { s/\(\d+\)$//; $_ } $index->fields;
cc74bccc	316	(my $index_table_name = $index->table->name) =~ s/^.+?\.//; # table name may not specify schema
cc74bccc	317	warn "removing schema name from '" . $index->table->name . "' to make '$index_table_name'\n" if $WARN;
bfb5a568	318	my $index_def =
907f8cea	319	"CREATE ${type}INDEX $name ON " . $index_table_name .
907f8cea	320	' (' . join( ', ', @fields ) . ')';
bfb5a568	321
	322	return $index_def;
	323	}
	324
	325	sub create_constraint
	326	{
	327	my ($c, $options) = @_;
	328
	329	my $name = $c->name;
4d438549	330	$name = mk_name($c->table->name, $name);
bfb5a568	331	my @fields = $c->fields;
cc74bccc	332	(my $index_table_name = $c->table->name) =~ s/^.+?\.//; # table name may not specify schema
cc74bccc	333	warn "removing schema name from '" . $c->table->name . "' to make '$index_table_name'\n" if $WARN;
bfb5a568	334
bfb5a568	335	my $c_def =
907f8cea	336	"CREATE UNIQUE INDEX $name ON " . $index_table_name .
907f8cea	337	' (' . join( ', ', @fields ) . ')';
bfb5a568	338
	339	return $c_def;
	340	}
	341
4d438549	342	sub alter_table { } # Noop
	343
	344	sub add_field {
	345	my ($field) = @_;
	346
	347	return sprintf("ALTER TABLE %s ADD COLUMN %s",
	348	$field->table->name, create_field($field))
	349	}
	350
	351	sub alter_create_index {
	352	my ($index) = @_;
	353
	354	# This might cause name collisions
	355	return create_index($index);
	356	}
	357
	358	sub alter_create_constraint {
	359	my ($constraint) = @_;
	360
	361	return create_constraint($constraint) if $constraint->type eq 'UNIQUE';
	362	}
	363
	364	sub alter_drop_constraint { alter_drop_index(@_) }
	365
	366	sub alter_drop_index {
	367	my ($constraint) = @_;
	368
ecf7f25d	369	return sprintf("DROP INDEX %s",
ecf7f25d	370	$constraint->name);
4d438549	371	}
	372
	373	sub batch_alter_table {
	374	my ($table, $diffs) = @_;
	375
4d438549	376	# If we have any of the following
	377	#
	378	# rename_field
	379	# alter_field
	380	# drop_field
	381	#
	382	# we need to do the following <http://www.sqlite.org/faq.html#q11>
	383	#
	384	# BEGIN TRANSACTION;
	385	# CREATE TEMPORARY TABLE t1_backup(a,b);
	386	# INSERT INTO t1_backup SELECT a,b FROM t1;
	387	# DROP TABLE t1;
	388	# CREATE TABLE t1(a,b);
	389	# INSERT INTO t1 SELECT a,b FROM t1_backup;
	390	# DROP TABLE t1_backup;
	391	# COMMIT;
	392	#
	393	# Fun, eh?
46bf5655	394	#
	395	# If we have rename_field we do similarly.
	396
	397	my $table_name = $table->name;
	398	my $renaming = $diffs->{rename_table} && @{$diffs->{rename_table}};
4d438549	399
	400	if ( @{$diffs->{rename_field}} == 0 &&
	401	@{$diffs->{alter_field}} == 0 &&
46bf5655	402	@{$diffs->{drop_field}} == 0
46bf5655	403	) {
24d9fe69	404	# return join("\n", map {
24d9fe69	405	return map {
4d438549	406	my $meth = __PACKAGE__->can($_) or die __PACKAGE__ . " cant $_";
24d9fe69	407	map { my $sql = $meth->(ref $_ eq 'ARRAY' ? @$_ : $_); $sql ? ("$sql") : () } @{ $diffs->{$_} }
4d438549	408
46bf5655	409	} grep { @{$diffs->{$_}} }
	410	qw/rename_table
	411	alter_drop_constraint
	412	alter_drop_index
	413	drop_field
	414	add_field
	415	alter_field
	416	rename_field
	417	alter_create_index
	418	alter_create_constraint
24d9fe69	419	alter_table/;
4d438549	420	}
	421
	422
	423	my @sql;
46bf5655	424	my $old_table = $renaming ? $diffs->{rename_table}[0][0] : $table;
4d438549	425
4d438549	426	do {
46bf5655	427	local $table->{name} = $table_name . '_temp_alter';
4d438549	428	# We only want the table - dont care about indexes on tmp table
	429	my ($table_sql) = create_table($table, {no_comments => 1, temporary_table => 1});
	430	push @sql,$table_sql;
	431	};
	432
46bf5655	433	push @sql, "INSERT INTO @{[$table_name]}_temp_alter SELECT @{[ join(', ', $old_table->get_fields)]} FROM @{[$old_table]}",
46bf5655	434	"DROP TABLE @{[$old_table]}",
4d438549	435	create_table($table, { no_comments => 1 }),
46bf5655	436	"INSERT INTO @{[$table_name]} SELECT @{[ join(', ', $old_table->get_fields)]} FROM @{[$table_name]}_temp_alter",
46bf5655	437	"DROP TABLE @{[$table_name]}_temp_alter";
4d438549	438
24d9fe69	439	return @sql;
24d9fe69	440	# return join("", @sql, "");
4d438549	441	}
	442
	443	sub drop_table {
	444	my ($table) = @_;
24d9fe69	445	return "DROP TABLE $table";
4d438549	446	}
4d438549	447
46bf5655	448	sub rename_table {
	449	my ($old_table, $new_table, $options) = @_;
	450
	451	my $qt = $options->{quote_table_names} \|\| '';
	452
	453	return "ALTER TABLE $qt$old_table$qt RENAME TO $qt$new_table$qt";
	454
	455	}
	456
934e1b39	457	# No-op. Just here to signify that we are a new style parser.
	458	sub preproces_schema { }
	459
bfb5a568	460	1;
758ab1cd	461
20770e44	462	=pod
	463
	464	=head1 SEE ALSO
	465
	466	SQL::Translator, http://www.sqlite.org/.
758ab1cd	467
	468	=head1 AUTHOR
	469
4d438549	470	Ken Y. Clark C<< <kclark@cpan.orgE> >>.
	471
	472	Diff code added by Ash Berlin C<< <ash@cpan.org> >>.
20770e44	473
20770e44	474	=cut