[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 = '1.99';
$DEBUG = 0 unless defined $DEBUG;
$WARN = 0 unless defined $WARN;

our %used_identifiers = ();
our $max_id_length    = 30;
our %global_names;
our %truncated;

sub produce {
    my $translator     = shift;
    local $DEBUG       = $translator->debug;
    local $WARN        = $translator->show_warnings;
    my $no_comments    = $translator->no_comments;
    my $add_drop_table = $translator->add_drop_table;
    my $schema         = $translator->schema;
    my $producer_args  = $translator->producer_args;
    my $sqlite_version = $producer_args->{sqlite_version} || 0;
    my $no_txn         = $producer_args->{no_transaction};

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

    my @create = ();
    push @create, header_comment unless ($no_comments);
    $create[0] .= "\n\nBEGIN TRANSACTION" unless $no_txn;

    for my $table ( $schema->get_tables ) {
        push @create, create_table($table, { no_comments => $no_comments,
                                             sqlite_version => $sqlite_version,
                                          add_drop_table => $add_drop_table,});
    }

    for my $view ( $schema->get_views ) {
      push @create, create_view($view, {
        add_drop_view => $add_drop_table,
        no_comments   => $no_comments,
      });
    }

    for my $trigger ( $schema->get_triggers ) {
      push @create, create_trigger($trigger, {
        add_drop_trigger => $add_drop_table,
        no_comments   => $no_comments,
      });
    }

    if (wantarray) {
      push @create, "COMMIT" unless $no_txn;
      return @create;
    } else {
      push @create, "COMMIT;\n" unless $no_txn;
      return join(";\n\n", @create );
    }
}

# -------------------------------------------------------------------
sub mk_name {
    my ($basename, $type, $scope, $critical) = @_;
    my $basename_orig = $basename;
    my $max_name      = !$max_id_length 
                      ? length($type) + 1
                      : $type 
                      ? $max_id_length - (length($type) + 1) 
                      : $max_id_length;
    $basename         = substr( $basename, 0, $max_name ) 
                        if length( $basename ) > $max_name;
    $basename         =~ s/\./_/g;
    my $name          = $type ? "${type}_$basename" : $basename;

    if ( $basename ne $basename_orig and $critical ) {
        my $show_type = $type ? "+'$type'" : "";
        warn "Truncating '$basename_orig'$show_type to $max_id_length ",
            "character limit to make '$name'\n" if $WARN;
        $truncated{ $basename_orig } = $name;
    }

    $scope ||= \%global_names;
    if ( my $prev = $scope->{ $name } ) {
        my $name_orig = $name;
        $name        .= sprintf( "%02d", ++$prev );
        substr($name, $max_id_length - 3) = "00" 
            if length( $name ) > $max_id_length;

        warn "The name '$name_orig' has been changed to ",
             "'$name' to make it unique.\n" if $WARN;

        $scope->{ $name_orig }++;
    }

    $scope->{ $name }++;
    return $name;
}

sub create_view {
    my ($view, $options) = @_;
    my $add_drop_view = $options->{add_drop_view};

    my $view_name = $view->name;
    debug("PKG: Looking at view '${view_name}'\n");

    # Header.  Should this look like what mysqldump produces?
    my $extra = $view->extra;
    my $create = '';
    $create .= "--\n-- View: ${view_name}\n--\n" unless $options->{no_comments};
    $create .= "DROP VIEW IF EXISTS $view_name;\n" if $add_drop_view;
    $create .= 'CREATE';
    $create .= " TEMPORARY" if exists($extra->{temporary}) && $extra->{temporary};
    $create .= ' VIEW';
    $create .= " IF NOT EXISTS" if exists($extra->{if_not_exists}) && $extra->{if_not_exists};
    $create .= " ${view_name}";

    if( my $sql = $view->sql ){
      $create .= " AS\n    ${sql}";
    }
    return $create;
}


sub create_table
{
    my ($table, $options) = @_;

    my $table_name = $table->name;
    my $no_comments = $options->{no_comments};
    my $add_drop_table = $options->{add_drop_table};
    my $sqlite_version = $options->{sqlite_version} || 0;

    debug("PKG: Looking at table '$table_name'\n");

    my ( @index_defs, @constraint_defs );
    my @fields = $table->get_fields or die "No fields in $table_name";

    my $temp = $options->{temporary_table} ? 'TEMPORARY ' : '';
    #
    # Header.
    #
    my $exists = ($sqlite_version >= 3.3) ? ' IF EXISTS' : '';
    my @create;
    my ($comment, $create_table) = "";
    $comment =  "--\n-- Table: $table_name\n--\n" unless $no_comments;
    if ($add_drop_table) {
      push @create, $comment . qq[DROP TABLE$exists $table_name];
    } else {
      $create_table = $comment;
    }

    $create_table .= "CREATE ${temp}TABLE $table_name (\n";

    #
    # Comments
    #
    if ( $table->comments and !$no_comments ){
        $create_table .= "-- Comments: \n-- ";
        $create_table .= join "\n-- ",  $table->comments;
        $create_table .= "\n--\n\n";
    }

    #
    # How many fields in PK?
    #
    my $pk        = $table->primary_key;
    my @pk_fields = $pk ? $pk->fields : ();

    #
    # Fields
    #
    my ( @field_defs, $pk_set );
    for my $field ( @fields ) {
        push @field_defs, create_field($field);
    }

    if ( 
         scalar @pk_fields > 1 
         || 
         ( @pk_fields && !grep /INTEGER PRIMARY KEY/, @field_defs ) 
         ) {
        push @field_defs, 'PRIMARY KEY (' . join(', ', @pk_fields ) . ')';
    }

    #
    # Indices
    #
    my $idx_name_default = 'A';
    for my $index ( $table->get_indices ) {
        push @index_defs, create_index($index);
    }

    #
    # Constraints
    #
    my $c_name_default = 'A';
    for my $c ( $table->get_constraints ) {
        next unless $c->type eq UNIQUE; 
        push @constraint_defs, create_constraint($c);
    }

    $create_table .= join(",\n", map { "  $_" } @field_defs ) . "\n)";

    return (@create, $create_table, @index_defs, @constraint_defs );
}

sub create_field
{
    my ($field, $options) = @_;

    my $field_name = $field->name;
    debug("PKG: Looking at field '$field_name'\n");
    my $field_comments = $field->comments 
        ? "-- " . $field->comments . "\n  " 
        : '';

    my $field_def = $field_comments.$field_name;

    # data type and size
    my $size      = $field->size;
    my $data_type = $field->data_type;
    $data_type    = 'varchar' if lc $data_type eq 'set';
    $data_type  = 'blob' if lc $data_type eq 'bytea';

    if ( lc $data_type =~ /(text|blob)/i ) {
        $size = undef;
    }

#             if ( $data_type =~ /timestamp/i ) {
#                 push @trigger_defs, 
#                     "CREATE TRIGGER ts_${table_name} ".
#                     "after insert on $table_name\n".
#                     "begin\n".
#                     "  update $table_name set $field_name=timestamp() ".
#                        "where id=new.id;\n".
#                     "end;\n"
#                 ;
#
#            }

    #
    # SQLite is generally typeless, but newer versions will
    # make a field autoincrement if it is declared as (and
    # *only* as) INTEGER PRIMARY KEY
    #
    my $pk        = $field->table->primary_key;
    my @pk_fields = $pk ? $pk->fields : ();

    if ( 
         $field->is_primary_key && 
         scalar @pk_fields == 1 &&
         (
          $data_type =~ /int(eger)?$/i
          ||
          ( $data_type =~ /^number?$/i && $size !~ /,/ )
          )
         ) {
        $data_type = 'INTEGER PRIMARY KEY';
        $size      = undef;
#        $pk_set    = 1;
    }

    $field_def .= sprintf " %s%s", $data_type, 
    ( !$field->is_auto_increment && $size ) ? "($size)" : '';

    # Null?
    $field_def .= ' NOT NULL' unless $field->is_nullable;

    # Default?  XXX Need better quoting!
    my $default = $field->default_value;
    if (defined $default) {
        SQL::Translator::Producer->_apply_default_value(
            \$field_def,
            $default, 
            [
             'NULL'              => \'NULL',
             'now()'             => 'now()',
             'CURRENT_TIMESTAMP' => 'CURRENT_TIMESTAMP',
            ],
        );
    }

    return $field_def;

}

sub create_index
{
    my ($index, $options) = @_;

    my $name   = $index->name;
    $name      = mk_name($index->table->name, $name);

    my $type   = $index->type eq 'UNIQUE' ? "UNIQUE " : ''; 

    # strip any field size qualifiers as SQLite doesn't like these
    my @fields = map { s/\(\d+\)$//; $_ } $index->fields;
    (my $index_table_name = $index->table->name) =~ s/^.+?\.//; # table name may not specify schema
    warn "removing schema name from '" . $index->table->name . "' to make '$index_table_name'\n" if $WARN;
    my $index_def =  
    "CREATE ${type}INDEX $name ON " . $index_table_name .
        ' (' . join( ', ', @fields ) . ')';

    return $index_def;
}

sub create_constraint
{
    my ($c, $options) = @_;

    my $name   = $c->name;
    $name      = mk_name($c->table->name, $name);
    my @fields = $c->fields;
    (my $index_table_name = $c->table->name) =~ s/^.+?\.//; # table name may not specify schema
    warn "removing schema name from '" . $c->table->name . "' to make '$index_table_name'\n" if $WARN;

    my $c_def =  
    "CREATE UNIQUE INDEX $name ON " . $index_table_name .
        ' (' . join( ', ', @fields ) . ')';

    return $c_def;
}

sub create_trigger {
  my ($trigger, $options) = @_;
  my $add_drop = $options->{add_drop_trigger};

  my $name = $trigger->name;
  my @create;

  push @create,  "DROP TRIGGER IF EXISTS $name" if $add_drop;

  my $events = $trigger->database_events;
  die "Can't handle multiple events in triggers" if @$events > 1;

  my $action = "";

  $DB::single = 1;
  unless (ref $trigger->action) {
    $action .= "BEGIN " . $trigger->action . " END";
  } else {
    $action = $trigger->action->{for_each} . " "
      if $trigger->action->{for_each};

    $action = $trigger->action->{when} . " "
      if $trigger->action->{when};

    my $steps = $trigger->action->{steps} || [];

    $action .= "BEGIN ";
    for (@$steps) {
      $action .= $_ . "; "
    }
    $action .= "END";
  }

  push @create, "CREATE TRIGGER $name " .
                $trigger->perform_action_when . " " .
                $events->[0] .
                " on " . $trigger->on_table . " " .
                $action;

  return @create;
            
}

sub alter_table { } # Noop

sub add_field {
  my ($field) = @_;

  return sprintf("ALTER TABLE %s ADD COLUMN %s",
      $field->table->name, create_field($field))
}

sub alter_create_index {
  my ($index) = @_;

  # This might cause name collisions
  return create_index($index);
}

sub alter_create_constraint {
  my ($constraint) = @_;

  return create_constraint($constraint) if $constraint->type eq 'UNIQUE';
}

sub alter_drop_constraint { alter_drop_index(@_) }

sub alter_drop_index {
  my ($constraint) = @_;

  return sprintf("DROP INDEX %s",
      $constraint->name);
}

sub batch_alter_table {
  my ($table, $diffs) = @_;

  # If we have any of the following
  #
  #  rename_field
  #  alter_field
  #  drop_field
  #
  # we need to do the following <http://www.sqlite.org/faq.html#q11>
  #
  # BEGIN TRANSACTION;
  # CREATE TEMPORARY TABLE t1_backup(a,b);
  # INSERT INTO t1_backup SELECT a,b FROM t1;
  # DROP TABLE t1;
  # CREATE TABLE t1(a,b);
  # INSERT INTO t1 SELECT a,b FROM t1_backup;
  # DROP TABLE t1_backup;
  # COMMIT;
  #
  # Fun, eh?
  #
  # If we have rename_field we do similarly.

  my $table_name = $table->name;
  my $renaming = $diffs->{rename_table} && @{$diffs->{rename_table}};

  if ( @{$diffs->{rename_field}} == 0 &&
       @{$diffs->{alter_field}}  == 0 &&
       @{$diffs->{drop_field}}   == 0
       ) {
#    return join("\n", map { 
    return map { 
        my $meth = __PACKAGE__->can($_) or die __PACKAGE__ . " cant $_";
        map { my $sql = $meth->(ref $_ eq 'ARRAY' ? @$_ : $_); $sql ?  ("$sql") : () } @{ $diffs->{$_} }
        
      } grep { @{$diffs->{$_}} } 
    qw/rename_table
       alter_drop_constraint
       alter_drop_index
       drop_field
       add_field
       alter_field
       rename_field
       alter_create_index
       alter_create_constraint
       alter_table/;
  }


  my @sql;
  my $old_table = $renaming ? $diffs->{rename_table}[0][0] : $table;
  
  do {
    local $table->{name} = $table_name . '_temp_alter';
    # We only want the table - dont care about indexes on tmp table
    my ($table_sql) = create_table($table, {no_comments => 1, temporary_table => 1});
    push @sql,$table_sql;
  };

  push @sql, "INSERT INTO @{[$table_name]}_temp_alter SELECT @{[ join(', ', $old_table->get_fields)]} FROM @{[$old_table]}",
             "DROP TABLE @{[$old_table]}",
             create_table($table, { no_comments => 1 }),
             "INSERT INTO @{[$table_name]} SELECT @{[ join(', ', $old_table->get_fields)]} FROM @{[$table_name]}_temp_alter",
             "DROP TABLE @{[$table_name]}_temp_alter";

  return @sql;
#  return join("", @sql, "");
}

sub drop_table {
  my ($table) = @_;
  return "DROP TABLE $table";
}

sub rename_table {
  my ($old_table, $new_table, $options) = @_;

  my $qt = $options->{quote_table_names} || '';

  return "ALTER TABLE $qt$old_table$qt RENAME TO $qt$new_table$qt";

}

# No-op. Just here to signify that we are a new style parser.
sub preproces_schema { }

1;

=pod

=head1 SEE ALSO

SQL::Translator, http://www.sqlite.org/.

=head1 AUTHOR

Ken Y. Clark C<< <kclark@cpan.orgE> >>.

Diff code added by Ash Berlin C<< <ash@cpan.org> >>.

=cut
Commit	Line	Data
758ab1cd	1	package SQL::Translator::Producer::SQLite;
	2
	3	# -------------------------------------------------------------------
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
da06ac74	46	$VERSION = '1.99';
5ee19df8	47	$DEBUG = 0 unless defined $DEBUG;
5ee19df8	48	$WARN = 0 unless defined $WARN;
758ab1cd	49
d0fcb05d	50	our %used_identifiers = ();
	51	our $max_id_length = 30;
	52	our %global_names;
	53	our %truncated;
758ab1cd	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;
f9c96971	63	my $sqlite_version = $producer_args->{sqlite_version} \|\| 0;
f9c96971	64	my $no_txn = $producer_args->{no_transaction};
758ab1cd	65
1a24938d	66	debug("PKG: Beginning production\n");
758ab1cd	67
24d9fe69	68	my @create = ();
24d9fe69	69	push @create, header_comment unless ($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 $no_txn;
	97	return join(";\n\n", @create );
	98	}
758ab1cd	99	}
758ab1cd	100
758ab1cd	101	# -------------------------------------------------------------------
	102	sub mk_name {
	103	my ($basename, $type, $scope, $critical) = @_;
	104	my $basename_orig = $basename;
d0fcb05d	105	my $max_name = !$max_id_length
	106	? length($type) + 1
	107	: $type
	108	? $max_id_length - (length($type) + 1)
	109	: $max_id_length;
758ab1cd	110	$basename = substr( $basename, 0, $max_name )
758ab1cd	111	if length( $basename ) > $max_name;
cc74bccc	112	$basename =~ s/\./_/g;
758ab1cd	113	my $name = $type ? "${type}_$basename" : $basename;
	114
	115	if ( $basename ne $basename_orig and $critical ) {
	116	my $show_type = $type ? "+'$type'" : "";
	117	warn "Truncating '$basename_orig'$show_type to $max_id_length ",
	118	"character limit to make '$name'\n" if $WARN;
	119	$truncated{ $basename_orig } = $name;
	120	}
	121
	122	$scope \|\|= \%global_names;
	123	if ( my $prev = $scope->{ $name } ) {
	124	my $name_orig = $name;
	125	$name .= sprintf( "%02d", ++$prev );
	126	substr($name, $max_id_length - 3) = "00"
	127	if length( $name ) > $max_id_length;
	128
	129	warn "The name '$name_orig' has been changed to ",
	130	"'$name' to make it unique.\n" if $WARN;
	131
	132	$scope->{ $name_orig }++;
	133	}
	134
	135	$scope->{ $name }++;
	136	return $name;
	137	}
	138
ec59a597	139	sub create_view {
ec59a597	140	my ($view, $options) = @_;
a25ac5d2	141	my $add_drop_view = $options->{add_drop_view};
ec59a597	142
	143	my $view_name = $view->name;
	144	debug("PKG: Looking at view '${view_name}'\n");
	145
	146	# Header. Should this look like what mysqldump produces?
	147	my $extra = $view->extra;
	148	my $create = '';
	149	$create .= "--\n-- View: ${view_name}\n--\n" unless $options->{no_comments};
a25ac5d2	150	$create .= "DROP VIEW IF EXISTS $view_name;\n" if $add_drop_view;
ec59a597	151	$create .= 'CREATE';
	152	$create .= " TEMPORARY" if exists($extra->{temporary}) && $extra->{temporary};
	153	$create .= ' VIEW';
	154	$create .= " IF NOT EXISTS" if exists($extra->{if_not_exists}) && $extra->{if_not_exists};
	155	$create .= " ${view_name}";
	156
	157	if( my $sql = $view->sql ){
a25ac5d2	158	$create .= " AS\n ${sql}";
ec59a597	159	}
ec59a597	160	return $create;
	161	}
	162
	163
bfb5a568	164	sub create_table
	165	{
	166	my ($table, $options) = @_;
758ab1cd	167
bfb5a568	168	my $table_name = $table->name;
	169	my $no_comments = $options->{no_comments};
	170	my $add_drop_table = $options->{add_drop_table};
3db73ef8	171	my $sqlite_version = $options->{sqlite_version} \|\| 0;
bfb5a568	172
	173	debug("PKG: Looking at table '$table_name'\n");
	174
d0fcb05d	175	my ( @index_defs, @constraint_defs );
bfb5a568	176	my @fields = $table->get_fields or die "No fields in $table_name";
bfb5a568	177
4d438549	178	my $temp = $options->{temporary_table} ? 'TEMPORARY ' : '';
bfb5a568	179	#
	180	# Header.
	181	#
d12f72ff	182	my $exists = ($sqlite_version >= 3.3) ? ' IF EXISTS' : '';
24d9fe69	183	my @create;
d0fcb05d	184	my ($comment, $create_table) = "";
	185	$comment = "--\n-- Table: $table_name\n--\n" unless $no_comments;
	186	if ($add_drop_table) {
	187	push @create, $comment . qq[DROP TABLE$exists $table_name];
	188	} else {
	189	$create_table = $comment;
	190	}
	191
	192	$create_table .= "CREATE ${temp}TABLE $table_name (\n";
bfb5a568	193
	194	#
	195	# Comments
	196	#
	197	if ( $table->comments and !$no_comments ){
24d9fe69	198	$create_table .= "-- Comments: \n-- ";
	199	$create_table .= join "\n-- ", $table->comments;
	200	$create_table .= "\n--\n\n";
bfb5a568	201	}
	202
	203	#
	204	# How many fields in PK?
	205	#
	206	my $pk = $table->primary_key;
	207	my @pk_fields = $pk ? $pk->fields : ();
	208
	209	#
	210	# Fields
	211	#
	212	my ( @field_defs, $pk_set );
	213	for my $field ( @fields ) {
	214	push @field_defs, create_field($field);
	215	}
	216
	217	if (
	218	scalar @pk_fields > 1
	219	\|\|
	220	( @pk_fields && !grep /INTEGER PRIMARY KEY/, @field_defs )
	221	) {
	222	push @field_defs, 'PRIMARY KEY (' . join(', ', @pk_fields ) . ')';
	223	}
	224
	225	#
	226	# Indices
	227	#
	228	my $idx_name_default = 'A';
	229	for my $index ( $table->get_indices ) {
	230	push @index_defs, create_index($index);
	231	}
	232
	233	#
	234	# Constraints
	235	#
	236	my $c_name_default = 'A';
	237	for my $c ( $table->get_constraints ) {
	238	next unless $c->type eq UNIQUE;
	239	push @constraint_defs, create_constraint($c);
	240	}
	241
24d9fe69	242	$create_table .= join(",\n", map { " $_" } @field_defs ) . "\n)";
bfb5a568	243
d0fcb05d	244	return (@create, $create_table, @index_defs, @constraint_defs );
bfb5a568	245	}
	246
	247	sub create_field
	248	{
	249	my ($field, $options) = @_;
	250
	251	my $field_name = $field->name;
	252	debug("PKG: Looking at field '$field_name'\n");
	253	my $field_comments = $field->comments
	254	? "-- " . $field->comments . "\n "
	255	: '';
	256
	257	my $field_def = $field_comments.$field_name;
	258
	259	# data type and size
	260	my $size = $field->size;
	261	my $data_type = $field->data_type;
	262	$data_type = 'varchar' if lc $data_type eq 'set';
	263	$data_type = 'blob' if lc $data_type eq 'bytea';
	264
	265	if ( lc $data_type =~ /(text\|blob)/i ) {
	266	$size = undef;
	267	}
	268
	269	# if ( $data_type =~ /timestamp/i ) {
	270	# push @trigger_defs,
	271	# "CREATE TRIGGER ts_${table_name} ".
	272	# "after insert on $table_name\n".
	273	# "begin\n".
	274	# " update $table_name set $field_name=timestamp() ".
	275	# "where id=new.id;\n".
	276	# "end;\n"
	277	# ;
	278	#
	279	# }
	280
	281	#
	282	# SQLite is generally typeless, but newer versions will
	283	# make a field autoincrement if it is declared as (and
	284	# only as) INTEGER PRIMARY KEY
	285	#
	286	my $pk = $field->table->primary_key;
	287	my @pk_fields = $pk ? $pk->fields : ();
	288
	289	if (
	290	$field->is_primary_key &&
	291	scalar @pk_fields == 1 &&
	292	(
	293	$data_type =~ /int(eger)?$/i
	294	\|\|
	295	( $data_type =~ /^number?$/i && $size !~ /,/ )
	296	)
	297	) {
	298	$data_type = 'INTEGER PRIMARY KEY';
	299	$size = undef;
	300	# $pk_set = 1;
	301	}
	302
	303	$field_def .= sprintf " %s%s", $data_type,
	304	( !$field->is_auto_increment && $size ) ? "($size)" : '';
	305
	306	# Null?
	307	$field_def .= ' NOT NULL' unless $field->is_nullable;
	308
309	# Default? XXX Need better quoting!
310	my $default = $field->default_value;
bc8e2aa1	311	if (defined $default) {
	312	SQL::Translator::Producer->_apply_default_value(
	313	\$field_def,
	314	$default,
	315	[
	316	'NULL' => \'NULL',
	317	'now()' => 'now()',
	318	'CURRENT_TIMESTAMP' => 'CURRENT_TIMESTAMP',
	319	],
	320	);
bfb5a568	321	}
	322
	323	return $field_def;
	324
	325	}
	326
	327	sub create_index
	328	{
	329	my ($index, $options) = @_;
	330
	331	my $name = $index->name;
4d438549	332	$name = mk_name($index->table->name, $name);
	333
	334	my $type = $index->type eq 'UNIQUE' ? "UNIQUE " : '';
bfb5a568	335
	336	# strip any field size qualifiers as SQLite doesn't like these
	337	my @fields = map { s/\(\d+\)$//; $_ } $index->fields;
cc74bccc	338	(my $index_table_name = $index->table->name) =~ s/^.+?\.//; # table name may not specify schema
cc74bccc	339	warn "removing schema name from '" . $index->table->name . "' to make '$index_table_name'\n" if $WARN;
bfb5a568	340	my $index_def =
907f8cea	341	"CREATE ${type}INDEX $name ON " . $index_table_name .
907f8cea	342	' (' . join( ', ', @fields ) . ')';
bfb5a568	343
	344	return $index_def;
	345	}
	346
	347	sub create_constraint
	348	{
	349	my ($c, $options) = @_;
	350
	351	my $name = $c->name;
4d438549	352	$name = mk_name($c->table->name, $name);
bfb5a568	353	my @fields = $c->fields;
cc74bccc	354	(my $index_table_name = $c->table->name) =~ s/^.+?\.//; # table name may not specify schema
cc74bccc	355	warn "removing schema name from '" . $c->table->name . "' to make '$index_table_name'\n" if $WARN;
bfb5a568	356
bfb5a568	357	my $c_def =
907f8cea	358	"CREATE UNIQUE INDEX $name ON " . $index_table_name .
907f8cea	359	' (' . join( ', ', @fields ) . ')';
bfb5a568	360
	361	return $c_def;
	362	}
	363
d0fcb05d	364	sub create_trigger {
	365	my ($trigger, $options) = @_;
	366	my $add_drop = $options->{add_drop_trigger};
	367
	368	my $name = $trigger->name;
	369	my @create;
	370
	371	push @create, "DROP TRIGGER IF EXISTS $name" if $add_drop;
	372
	373	my $events = $trigger->database_events;
	374	die "Can't handle multiple events in triggers" if @$events > 1;
	375
	376	my $action = "";
d0fcb05d	377
f9c96971	378	$DB::single = 1;
	379	unless (ref $trigger->action) {
	380	$action .= "BEGIN " . $trigger->action . " END";
	381	} else {
	382	$action = $trigger->action->{for_each} . " "
	383	if $trigger->action->{for_each};
d0fcb05d	384
f9c96971	385	$action = $trigger->action->{when} . " "
f9c96971	386	if $trigger->action->{when};
d0fcb05d	387
f9c96971	388	my $steps = $trigger->action->{steps} \|\| [];
	389
	390	$action .= "BEGIN ";
	391	for (@$steps) {
	392	$action .= $_ . "; "
	393	}
	394	$action .= "END";
d0fcb05d	395	}
d0fcb05d	396
	397	push @create, "CREATE TRIGGER $name " .
	398	$trigger->perform_action_when . " " .
	399	$events->[0] .
	400	" on " . $trigger->on_table . " " .
	401	$action;
	402
	403	return @create;
	404
	405	}
	406
4d438549	407	sub alter_table { } # Noop
	408
	409	sub add_field {
	410	my ($field) = @_;
	411
	412	return sprintf("ALTER TABLE %s ADD COLUMN %s",
	413	$field->table->name, create_field($field))
	414	}
	415
	416	sub alter_create_index {
	417	my ($index) = @_;
	418
	419	# This might cause name collisions
	420	return create_index($index);
	421	}
	422
	423	sub alter_create_constraint {
	424	my ($constraint) = @_;
	425
	426	return create_constraint($constraint) if $constraint->type eq 'UNIQUE';
	427	}
	428
	429	sub alter_drop_constraint { alter_drop_index(@_) }
	430
	431	sub alter_drop_index {
	432	my ($constraint) = @_;
	433
ecf7f25d	434	return sprintf("DROP INDEX %s",
ecf7f25d	435	$constraint->name);
4d438549	436	}
	437
	438	sub batch_alter_table {
	439	my ($table, $diffs) = @_;
	440
4d438549	441	# If we have any of the following
	442	#
	443	# rename_field
	444	# alter_field
	445	# drop_field
	446	#
	447	# we need to do the following <http://www.sqlite.org/faq.html#q11>
	448	#
	449	# BEGIN TRANSACTION;
	450	# CREATE TEMPORARY TABLE t1_backup(a,b);
	451	# INSERT INTO t1_backup SELECT a,b FROM t1;
	452	# DROP TABLE t1;
	453	# CREATE TABLE t1(a,b);
	454	# INSERT INTO t1 SELECT a,b FROM t1_backup;
	455	# DROP TABLE t1_backup;
	456	# COMMIT;
	457	#
	458	# Fun, eh?
46bf5655	459	#
	460	# If we have rename_field we do similarly.
	461
	462	my $table_name = $table->name;
	463	my $renaming = $diffs->{rename_table} && @{$diffs->{rename_table}};
4d438549	464
	465	if ( @{$diffs->{rename_field}} == 0 &&
	466	@{$diffs->{alter_field}} == 0 &&
46bf5655	467	@{$diffs->{drop_field}} == 0
46bf5655	468	) {
24d9fe69	469	# return join("\n", map {
24d9fe69	470	return map {
4d438549	471	my $meth = __PACKAGE__->can($_) or die __PACKAGE__ . " cant $_";
24d9fe69	472	map { my $sql = $meth->(ref $_ eq 'ARRAY' ? @$_ : $_); $sql ? ("$sql") : () } @{ $diffs->{$_} }
4d438549	473
46bf5655	474	} grep { @{$diffs->{$_}} }
	475	qw/rename_table
	476	alter_drop_constraint
	477	alter_drop_index
	478	drop_field
	479	add_field
	480	alter_field
	481	rename_field
	482	alter_create_index
	483	alter_create_constraint
24d9fe69	484	alter_table/;
4d438549	485	}
	486
	487
	488	my @sql;
46bf5655	489	my $old_table = $renaming ? $diffs->{rename_table}[0][0] : $table;
4d438549	490
4d438549	491	do {
46bf5655	492	local $table->{name} = $table_name . '_temp_alter';
4d438549	493	# We only want the table - dont care about indexes on tmp table
	494	my ($table_sql) = create_table($table, {no_comments => 1, temporary_table => 1});
	495	push @sql,$table_sql;
	496	};
	497
46bf5655	498	push @sql, "INSERT INTO @{[$table_name]}_temp_alter SELECT @{[ join(', ', $old_table->get_fields)]} FROM @{[$old_table]}",
46bf5655	499	"DROP TABLE @{[$old_table]}",
4d438549	500	create_table($table, { no_comments => 1 }),
46bf5655	501	"INSERT INTO @{[$table_name]} SELECT @{[ join(', ', $old_table->get_fields)]} FROM @{[$table_name]}_temp_alter",
46bf5655	502	"DROP TABLE @{[$table_name]}_temp_alter";
4d438549	503
24d9fe69	504	return @sql;
24d9fe69	505	# return join("", @sql, "");
4d438549	506	}
	507
	508	sub drop_table {
	509	my ($table) = @_;
24d9fe69	510	return "DROP TABLE $table";
4d438549	511	}
4d438549	512
46bf5655	513	sub rename_table {
	514	my ($old_table, $new_table, $options) = @_;
	515
	516	my $qt = $options->{quote_table_names} \|\| '';
	517
	518	return "ALTER TABLE $qt$old_table$qt RENAME TO $qt$new_table$qt";
	519
	520	}
	521
934e1b39	522	# No-op. Just here to signify that we are a new style parser.
	523	sub preproces_schema { }
	524
bfb5a568	525	1;
758ab1cd	526
20770e44	527	=pod
	528
	529	=head1 SEE ALSO
	530
	531	SQL::Translator, http://www.sqlite.org/.
758ab1cd	532
	533	=head1 AUTHOR
	534
4d438549	535	Ken Y. Clark C<< <kclark@cpan.orgE> >>.
	536
	537	Diff code added by Ash Berlin C<< <ash@cpan.org> >>.
20770e44	538
20770e44	539	=cut