[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 parse_dbms_version);

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 = parse_dbms_version(
        $producer_args->{sqlite_version}, 'perl'
    );
    my $no_txn         = $producer_args->{no_transaction};

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

    %global_names = ();   #reset


    my $head = (header_comment() . "\n") unless $no_comments;

    my @create = ();

    push @create, "BEGIN 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,
      });
    }

    push @create, "COMMIT" unless $no_txn;

    if (wantarray) {
      return ($head||(), @create);
    } else {
      return join ('',
        $head||(),
        join(";\n\n", @create ),
        ";\n",
      );
    }
}

# -------------------------------------------------------------------
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;
    push @create, "DROP VIEW IF EXISTS $view_name" if $add_drop_view;

    my $create_view = 'CREATE';
    $create_view .= " TEMPORARY" if exists($extra->{temporary}) && $extra->{temporary};
    $create_view .= ' VIEW';
    $create_view .= " IF NOT EXISTS" if exists($extra->{if_not_exists}) && $extra->{if_not_exists};
    $create_view .= " ${view_name}";

    if( my $sql = $view->sql ){
      $create_view .= " AS\n    ${sql}";
    }
    push @create, $create_view;

    # Tack the comment onto the first statement.
    unless ($options->{no_comments}) {
      $create[0] = "--\n-- View: ${view_name}\n--\n" . $create[0];
    }

    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 >= 3.003) ? ' 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?
    SQL::Translator::Producer->_apply_default_value(
        $field,
        \$field_def,
        [
         '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;
7b4b17aa	42	use SQL::Translator::Utils qw(debug header_comment parse_dbms_version);
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;
7b4b17aa	61	my $sqlite_version = parse_dbms_version(
	62	$producer_args->{sqlite_version}, 'perl'
	63	);
f9c96971	64	my $no_txn = $producer_args->{no_transaction};
758ab1cd	65
1a24938d	66	debug("PKG: Beginning production\n");
758ab1cd	67
ae602737	68	%global_names = (); #reset
ae602737	69
b6b0696f	70
	71	my $head = (header_comment() . "\n") unless $no_comments;
	72
24d9fe69	73	my @create = ();
b6b0696f	74
b6b0696f	75	push @create, "BEGIN TRANSACTION" unless $no_txn;
758ab1cd	76
b21bf652	77	for my $table ( $schema->get_tables ) {
24d9fe69	78	push @create, create_table($table, { no_comments => $no_comments,
d12f72ff	79	sqlite_version => $sqlite_version,
4d438549	80	add_drop_table => $add_drop_table,});
a5a882f0	81	}
a5a882f0	82
ec59a597	83	for my $view ( $schema->get_views ) {
24d9fe69	84	push @create, create_view($view, {
a25ac5d2	85	add_drop_view => $add_drop_table,
	86	no_comments => $no_comments,
	87	});
ec59a597	88	}
ec59a597	89
d0fcb05d	90	for my $trigger ( $schema->get_triggers ) {
	91	push @create, create_trigger($trigger, {
	92	add_drop_trigger => $add_drop_table,
	93	no_comments => $no_comments,
	94	});
	95	}
	96
b6b0696f	97	push @create, "COMMIT" unless $no_txn;
b6b0696f	98
f9c96971	99	if (wantarray) {
b6b0696f	100	return ($head\|\|(), @create);
f9c96971	101	} else {
b6b0696f	102	return join ('',
	103	$head\|\|(),
	104	join(";\n\n", @create ),
	105	";\n",
	106	);
f9c96971	107	}
758ab1cd	108	}
758ab1cd	109
758ab1cd	110	# -------------------------------------------------------------------
758ab1cd	111	sub mk_name {
ae602737	112	my ($name, $scope, $critical) = @_;
758ab1cd	113
	114	$scope \|\|= \%global_names;
	115	if ( my $prev = $scope->{ $name } ) {
	116	my $name_orig = $name;
	117	$name .= sprintf( "%02d", ++$prev );
11ad2df9	118	substr($name, $max_id_length - 3) = "00"
11ad2df9	119	if length( $name ) > $max_id_length;
758ab1cd	120
	121	warn "The name '$name_orig' has been changed to ",
	122	"'$name' to make it unique.\n" if $WARN;
	123
	124	$scope->{ $name_orig }++;
	125	}
	126
	127	$scope->{ $name }++;
	128	return $name;
	129	}
	130
ec59a597	131	sub create_view {
ec59a597	132	my ($view, $options) = @_;
a25ac5d2	133	my $add_drop_view = $options->{add_drop_view};
ec59a597	134
	135	my $view_name = $view->name;
	136	debug("PKG: Looking at view '${view_name}'\n");
	137
	138	# Header. Should this look like what mysqldump produces?
	139	my $extra = $view->extra;
4c0d31c1	140	my @create;
	141	push @create, "DROP VIEW IF EXISTS $view_name" if $add_drop_view;
	142
	143	my $create_view = 'CREATE';
	144	$create_view .= " TEMPORARY" if exists($extra->{temporary}) && $extra->{temporary};
	145	$create_view .= ' VIEW';
	146	$create_view .= " IF NOT EXISTS" if exists($extra->{if_not_exists}) && $extra->{if_not_exists};
	147	$create_view .= " ${view_name}";
ec59a597	148
ec59a597	149	if( my $sql = $view->sql ){
4c0d31c1	150	$create_view .= " AS\n ${sql}";
ec59a597	151	}
4c0d31c1	152	push @create, $create_view;
	153
	154	# Tack the comment onto the first statement.
	155	unless ($options->{no_comments}) {
	156	$create[0] = "--\n-- View: ${view_name}\n--\n" . $create[0];
	157	}
	158
	159	return @create;
ec59a597	160	}
	161
	162
bfb5a568	163	sub create_table
	164	{
	165	my ($table, $options) = @_;
758ab1cd	166
bfb5a568	167	my $table_name = $table->name;
	168	my $no_comments = $options->{no_comments};
	169	my $add_drop_table = $options->{add_drop_table};
3db73ef8	170	my $sqlite_version = $options->{sqlite_version} \|\| 0;
bfb5a568	171
	172	debug("PKG: Looking at table '$table_name'\n");
	173
d0fcb05d	174	my ( @index_defs, @constraint_defs );
bfb5a568	175	my @fields = $table->get_fields or die "No fields in $table_name";
bfb5a568	176
4d438549	177	my $temp = $options->{temporary_table} ? 'TEMPORARY ' : '';
bfb5a568	178	#
	179	# Header.
	180	#
7b4b17aa	181	my $exists = ($sqlite_version >= 3.003) ? ' IF EXISTS' : '';
24d9fe69	182	my @create;
d0fcb05d	183	my ($comment, $create_table) = "";
	184	$comment = "--\n-- Table: $table_name\n--\n" unless $no_comments;
	185	if ($add_drop_table) {
	186	push @create, $comment . qq[DROP TABLE$exists $table_name];
	187	} else {
	188	$create_table = $comment;
	189	}
	190
	191	$create_table .= "CREATE ${temp}TABLE $table_name (\n";
bfb5a568	192
	193	#
	194	# Comments
	195	#
	196	if ( $table->comments and !$no_comments ){
24d9fe69	197	$create_table .= "-- Comments: \n-- ";
	198	$create_table .= join "\n-- ", $table->comments;
	199	$create_table .= "\n--\n\n";
bfb5a568	200	}
	201
	202	#
	203	# How many fields in PK?
	204	#
	205	my $pk = $table->primary_key;
	206	my @pk_fields = $pk ? $pk->fields : ();
	207
	208	#
	209	# Fields
	210	#
	211	my ( @field_defs, $pk_set );
	212	for my $field ( @fields ) {
	213	push @field_defs, create_field($field);
	214	}
	215
	216	if (
	217	scalar @pk_fields > 1
	218	\|\|
	219	( @pk_fields && !grep /INTEGER PRIMARY KEY/, @field_defs )
	220	) {
	221	push @field_defs, 'PRIMARY KEY (' . join(', ', @pk_fields ) . ')';
	222	}
	223
	224	#
	225	# Indices
	226	#
	227	my $idx_name_default = 'A';
	228	for my $index ( $table->get_indices ) {
	229	push @index_defs, create_index($index);
	230	}
	231
	232	#
	233	# Constraints
	234	#
	235	my $c_name_default = 'A';
	236	for my $c ( $table->get_constraints ) {
	237	next unless $c->type eq UNIQUE;
	238	push @constraint_defs, create_constraint($c);
	239	}
	240
24d9fe69	241	$create_table .= join(",\n", map { " $_" } @field_defs ) . "\n)";
bfb5a568	242
d0fcb05d	243	return (@create, $create_table, @index_defs, @constraint_defs );
bfb5a568	244	}
	245
	246	sub create_field
	247	{
	248	my ($field, $options) = @_;
	249
	250	my $field_name = $field->name;
	251	debug("PKG: Looking at field '$field_name'\n");
	252	my $field_comments = $field->comments
	253	? "-- " . $field->comments . "\n "
	254	: '';
	255
	256	my $field_def = $field_comments.$field_name;
	257
	258	# data type and size
	259	my $size = $field->size;
	260	my $data_type = $field->data_type;
	261	$data_type = 'varchar' if lc $data_type eq 'set';
	262	$data_type = 'blob' if lc $data_type eq 'bytea';
	263
	264	if ( lc $data_type =~ /(text\|blob)/i ) {
	265	$size = undef;
	266	}
	267
	268	# if ( $data_type =~ /timestamp/i ) {
	269	# push @trigger_defs,
	270	# "CREATE TRIGGER ts_${table_name} ".
	271	# "after insert on $table_name\n".
	272	# "begin\n".
	273	# " update $table_name set $field_name=timestamp() ".
	274	# "where id=new.id;\n".
	275	# "end;\n"
	276	# ;
	277	#
	278	# }
	279
	280	#
	281	# SQLite is generally typeless, but newer versions will
	282	# make a field autoincrement if it is declared as (and
	283	# only as) INTEGER PRIMARY KEY
	284	#
	285	my $pk = $field->table->primary_key;
	286	my @pk_fields = $pk ? $pk->fields : ();
	287
	288	if (
	289	$field->is_primary_key &&
	290	scalar @pk_fields == 1 &&
	291	(
	292	$data_type =~ /int(eger)?$/i
	293	\|\|
	294	( $data_type =~ /^number?$/i && $size !~ /,/ )
	295	)
	296	) {
	297	$data_type = 'INTEGER PRIMARY KEY';
	298	$size = undef;
	299	# $pk_set = 1;
	300	}
	301
	302	$field_def .= sprintf " %s%s", $data_type,
	303	( !$field->is_auto_increment && $size ) ? "($size)" : '';
	304
	305	# Null?
	306	$field_def .= ' NOT NULL' unless $field->is_nullable;
	307
06baeb21	308	# Default?
	309	SQL::Translator::Producer->_apply_default_value(
	310	$field,
	311	\$field_def,
	312	[
	313	'NULL' => \'NULL',
	314	'now()' => 'now()',
	315	'CURRENT_TIMESTAMP' => 'CURRENT_TIMESTAMP',
	316	],
	317	);
bfb5a568	318
	319	return $field_def;
	320
	321	}
	322
	323	sub create_index
	324	{
	325	my ($index, $options) = @_;
	326
	327	my $name = $index->name;
ae602737	328	$name = mk_name($name);
4d438549	329
4d438549	330	my $type = $index->type eq 'UNIQUE' ? "UNIQUE " : '';
bfb5a568	331
	332	# strip any field size qualifiers as SQLite doesn't like these
	333	my @fields = map { s/\(\d+\)$//; $_ } $index->fields;
cc74bccc	334	(my $index_table_name = $index->table->name) =~ s/^.+?\.//; # table name may not specify schema
cc74bccc	335	warn "removing schema name from '" . $index->table->name . "' to make '$index_table_name'\n" if $WARN;
bfb5a568	336	my $index_def =
907f8cea	337	"CREATE ${type}INDEX $name ON " . $index_table_name .
907f8cea	338	' (' . join( ', ', @fields ) . ')';
bfb5a568	339
	340	return $index_def;
	341	}
	342
	343	sub create_constraint
	344	{
	345	my ($c, $options) = @_;
	346
	347	my $name = $c->name;
ae602737	348	$name = mk_name($name);
bfb5a568	349	my @fields = $c->fields;
cc74bccc	350	(my $index_table_name = $c->table->name) =~ s/^.+?\.//; # table name may not specify schema
cc74bccc	351	warn "removing schema name from '" . $c->table->name . "' to make '$index_table_name'\n" if $WARN;
bfb5a568	352
bfb5a568	353	my $c_def =
907f8cea	354	"CREATE UNIQUE INDEX $name ON " . $index_table_name .
907f8cea	355	' (' . join( ', ', @fields ) . ')';
bfb5a568	356
	357	return $c_def;
	358	}
	359
d0fcb05d	360	sub create_trigger {
	361	my ($trigger, $options) = @_;
	362	my $add_drop = $options->{add_drop_trigger};
	363
410d4a42	364	my @statements;
d0fcb05d	365
410d4a42	366	my $trigger_name = $trigger->name;
d0fcb05d	367	my $events = $trigger->database_events;
410d4a42	368	for my $evt ( @$events ) {
d0fcb05d	369
410d4a42	370	my $trig_name = $trigger_name;
	371	if (@$events > 1) {
	372	$trig_name .= "_$evt";
d0fcb05d	373
410d4a42	374	warn "Multiple database events supplied for trigger '$trigger_name', ",
	375	"creating trigger '$trig_name' for the '$evt' event.\n" if $WARN;
	376	}
d0fcb05d	377
410d4a42	378	push @statements, "DROP TRIGGER IF EXISTS $trig_name" if $add_drop;
d0fcb05d	379
f9c96971	380
410d4a42	381	$DB::single = 1;
	382	my $action = "";
	383	if (not ref $trigger->action) {
	384	$action .= "BEGIN " . $trigger->action . " END";
f9c96971	385	}
410d4a42	386	else {
	387	$action = $trigger->action->{for_each} . " "
	388	if $trigger->action->{for_each};
	389
	390	$action = $trigger->action->{when} . " "
	391	if $trigger->action->{when};
d0fcb05d	392
410d4a42	393	my $steps = $trigger->action->{steps} \|\| [];
	394
	395	$action .= "BEGIN ";
	396	$action .= $_ . "; " for (@$steps);
	397	$action .= "END";
	398	}
	399
	400	push @statements, sprintf (
	401	'CREATE TRIGGER %s %s %s on %s %s',
	402	$trig_name,
	403	$trigger->perform_action_when,
	404	$evt,
	405	$trigger->on_table,
	406	$action
	407	);
	408	}
d0fcb05d	409
410d4a42	410	return @statements;
d0fcb05d	411	}
d0fcb05d	412
4d438549	413	sub alter_table { } # Noop
	414
	415	sub add_field {
	416	my ($field) = @_;
	417
	418	return sprintf("ALTER TABLE %s ADD COLUMN %s",
	419	$field->table->name, create_field($field))
	420	}
	421
	422	sub alter_create_index {
	423	my ($index) = @_;
	424
	425	# This might cause name collisions
	426	return create_index($index);
	427	}
	428
	429	sub alter_create_constraint {
	430	my ($constraint) = @_;
	431
	432	return create_constraint($constraint) if $constraint->type eq 'UNIQUE';
	433	}
	434
	435	sub alter_drop_constraint { alter_drop_index(@_) }
	436
	437	sub alter_drop_index {
	438	my ($constraint) = @_;
	439
ecf7f25d	440	return sprintf("DROP INDEX %s",
ecf7f25d	441	$constraint->name);
4d438549	442	}
	443
	444	sub batch_alter_table {
	445	my ($table, $diffs) = @_;
	446
4d438549	447	# If we have any of the following
	448	#
	449	# rename_field
	450	# alter_field
	451	# drop_field
	452	#
	453	# we need to do the following <http://www.sqlite.org/faq.html#q11>
	454	#
	455	# BEGIN TRANSACTION;
	456	# CREATE TEMPORARY TABLE t1_backup(a,b);
	457	# INSERT INTO t1_backup SELECT a,b FROM t1;
	458	# DROP TABLE t1;
	459	# CREATE TABLE t1(a,b);
	460	# INSERT INTO t1 SELECT a,b FROM t1_backup;
	461	# DROP TABLE t1_backup;
	462	# COMMIT;
	463	#
	464	# Fun, eh?
46bf5655	465	#
	466	# If we have rename_field we do similarly.
	467
	468	my $table_name = $table->name;
	469	my $renaming = $diffs->{rename_table} && @{$diffs->{rename_table}};
4d438549	470
	471	if ( @{$diffs->{rename_field}} == 0 &&
	472	@{$diffs->{alter_field}} == 0 &&
46bf5655	473	@{$diffs->{drop_field}} == 0
46bf5655	474	) {
24d9fe69	475	# return join("\n", map {
24d9fe69	476	return map {
4d438549	477	my $meth = __PACKAGE__->can($_) or die __PACKAGE__ . " cant $_";
24d9fe69	478	map { my $sql = $meth->(ref $_ eq 'ARRAY' ? @$_ : $_); $sql ? ("$sql") : () } @{ $diffs->{$_} }
4d438549	479
46bf5655	480	} grep { @{$diffs->{$_}} }
	481	qw/rename_table
	482	alter_drop_constraint
	483	alter_drop_index
	484	drop_field
	485	add_field
	486	alter_field
	487	rename_field
	488	alter_create_index
	489	alter_create_constraint
24d9fe69	490	alter_table/;
4d438549	491	}
	492
	493
	494	my @sql;
46bf5655	495	my $old_table = $renaming ? $diffs->{rename_table}[0][0] : $table;
4d438549	496
4d438549	497	do {
46bf5655	498	local $table->{name} = $table_name . '_temp_alter';
4d438549	499	# We only want the table - dont care about indexes on tmp table
	500	my ($table_sql) = create_table($table, {no_comments => 1, temporary_table => 1});
	501	push @sql,$table_sql;
	502	};
	503
46bf5655	504	push @sql, "INSERT INTO @{[$table_name]}_temp_alter SELECT @{[ join(', ', $old_table->get_fields)]} FROM @{[$old_table]}",
46bf5655	505	"DROP TABLE @{[$old_table]}",
4d438549	506	create_table($table, { no_comments => 1 }),
46bf5655	507	"INSERT INTO @{[$table_name]} SELECT @{[ join(', ', $old_table->get_fields)]} FROM @{[$table_name]}_temp_alter",
46bf5655	508	"DROP TABLE @{[$table_name]}_temp_alter";
4d438549	509
24d9fe69	510	return @sql;
24d9fe69	511	# return join("", @sql, "");
4d438549	512	}
	513
	514	sub drop_table {
	515	my ($table) = @_;
24d9fe69	516	return "DROP TABLE $table";
4d438549	517	}
4d438549	518
46bf5655	519	sub rename_table {
	520	my ($old_table, $new_table, $options) = @_;
	521
	522	my $qt = $options->{quote_table_names} \|\| '';
	523
	524	return "ALTER TABLE $qt$old_table$qt RENAME TO $qt$new_table$qt";
	525
	526	}
	527
934e1b39	528	# No-op. Just here to signify that we are a new style parser.
	529	sub preproces_schema { }
	530
bfb5a568	531	1;
758ab1cd	532
20770e44	533	=pod
	534
	535	=head1 SEE ALSO
	536
	537	SQL::Translator, http://www.sqlite.org/.
758ab1cd	538
	539	=head1 AUTHOR
	540
11ad2df9	541	Ken Youens-Clark C<< <kclark@cpan.orgE> >>.
4d438549	542
4d438549	543	Diff code added by Ash Berlin C<< <ash@cpan.org> >>.
20770e44	544
20770e44	545	=cut