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

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

# -------------------------------------------------------------------
# $Id: SQLite.pm,v 1.15 2006-08-26 11:35:31 schiffbruechige Exp $
# -------------------------------------------------------------------
# Copyright (C) 2002-4 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[ $VERSION $DEBUG $WARN ];

$VERSION = sprintf "%d.%02d", q$Revision: 1.15 $ =~ /(\d+)\.(\d+)/;
$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;

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

    my $create = '';
    $create .= header_comment unless ($no_comments);
    $create .= "BEGIN TRANSACTION;\n\n";

    my @table_defs = ();
    for my $table ( $schema->get_tables ) {
        my @defs = create_table($table, { no_comments => $no_comments,
                                          add_drop_table => $add_drop_table,});
        my $create = shift @defs;
        $create .= ";\n";
        push @table_defs, $create, map( { "$_;" } @defs), "";
    }

#    $create .= "COMMIT;\n";

    return wantarray ? ($create, @table_defs, "COMMIT;\n") : join("\n", ($create, @table_defs, "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_table
{
    my ($table, $options) = @_;

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

    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 $create = '';
    $create .= "--\n-- Table: $table_name\n--\n" unless $no_comments;
    $create .= qq[DROP TABLE $table_name;\n] if $add_drop_table;
    $create .= "CREATE ${temp}TABLE $table_name (\n";

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

    return ($create, @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 ) {
        if ( uc $default eq 'NULL') {
            $field_def .= ' DEFAULT NULL';
        } elsif ( $default eq 'now()' ||
                  $default eq 'CURRENT_TIMESTAMP' ) {
            $field_def .= ' DEFAULT CURRENT_TIMESTAMP';
        } elsif ( $default =~ /val\(/ ) {
            next;
        } else {
            $field_def .= " DEFAULT '$default'";
        }
    }

    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 ON %s",
      $constraint->name, $constraint->table->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 { 
        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 join(";\n", @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";

}

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	# -------------------------------------------------------------------
8619aed2	4	# $Id: SQLite.pm,v 1.15 2006-08-26 11:35:31 schiffbruechige Exp $
758ab1cd	5	# -------------------------------------------------------------------
977651a5	6	# Copyright (C) 2002-4 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
758ab1cd	45	use vars qw[ $VERSION $DEBUG $WARN ];
5ee19df8	46
8619aed2	47	$VERSION = sprintf "%d.%02d", q$Revision: 1.15 $ =~ /(\d+)\.(\d+)/;
5ee19df8	48	$DEBUG = 0 unless defined $DEBUG;
5ee19df8	49	$WARN = 0 unless defined $WARN;
758ab1cd	50
	51	my %used_identifiers = ();
	52	my $max_id_length = 30;
	53	my %global_names;
	54	my %truncated;
	55
758ab1cd	56	sub produce {
a1d94525	57	my $translator = shift;
	58	local $DEBUG = $translator->debug;
	59	local $WARN = $translator->show_warnings;
	60	my $no_comments = $translator->no_comments;
	61	my $add_drop_table = $translator->add_drop_table;
	62	my $schema = $translator->schema;
758ab1cd	63
1a24938d	64	debug("PKG: Beginning production\n");
758ab1cd	65
a5a882f0	66	my $create = '';
5ee19df8	67	$create .= header_comment unless ($no_comments);
a5a882f0	68	$create .= "BEGIN TRANSACTION;\n\n";
758ab1cd	69
bfb5a568	70	my @table_defs = ();
b21bf652	71	for my $table ( $schema->get_tables ) {
4d438549	72	my @defs = create_table($table, { no_comments => $no_comments,
	73	add_drop_table => $add_drop_table,});
	74	my $create = shift @defs;
	75	$create .= ";\n";
	76	push @table_defs, $create, map( { "$_;" } @defs), "";
a5a882f0	77	}
a5a882f0	78
bfb5a568	79	# $create .= "COMMIT;\n";
a5a882f0	80
bfb5a568	81	return wantarray ? ($create, @table_defs, "COMMIT;\n") : join("\n", ($create, @table_defs, "COMMIT;\n"));
758ab1cd	82	}
758ab1cd	83
758ab1cd	84	# -------------------------------------------------------------------
	85	sub mk_name {
	86	my ($basename, $type, $scope, $critical) = @_;
	87	my $basename_orig = $basename;
	88	my $max_name = $type
	89	? $max_id_length - (length($type) + 1)
	90	: $max_id_length;
	91	$basename = substr( $basename, 0, $max_name )
	92	if length( $basename ) > $max_name;
cc74bccc	93	$basename =~ s/\./_/g;
758ab1cd	94	my $name = $type ? "${type}_$basename" : $basename;
	95
	96	if ( $basename ne $basename_orig and $critical ) {
	97	my $show_type = $type ? "+'$type'" : "";
	98	warn "Truncating '$basename_orig'$show_type to $max_id_length ",
	99	"character limit to make '$name'\n" if $WARN;
	100	$truncated{ $basename_orig } = $name;
	101	}
	102
	103	$scope \|\|= \%global_names;
	104	if ( my $prev = $scope->{ $name } ) {
	105	my $name_orig = $name;
	106	$name .= sprintf( "%02d", ++$prev );
	107	substr($name, $max_id_length - 3) = "00"
	108	if length( $name ) > $max_id_length;
	109
	110	warn "The name '$name_orig' has been changed to ",
	111	"'$name' to make it unique.\n" if $WARN;
	112
	113	$scope->{ $name_orig }++;
	114	}
	115
	116	$scope->{ $name }++;
	117	return $name;
	118	}
	119
bfb5a568	120	sub create_table
	121	{
	122	my ($table, $options) = @_;
758ab1cd	123
bfb5a568	124	my $table_name = $table->name;
	125	my $no_comments = $options->{no_comments};
	126	my $add_drop_table = $options->{add_drop_table};
	127
	128	debug("PKG: Looking at table '$table_name'\n");
	129
	130	my ( @index_defs, @constraint_defs, @trigger_defs );
	131	my @fields = $table->get_fields or die "No fields in $table_name";
	132
4d438549	133	my $temp = $options->{temporary_table} ? 'TEMPORARY ' : '';
bfb5a568	134	#
	135	# Header.
	136	#
	137	my $create = '';
	138	$create .= "--\n-- Table: $table_name\n--\n" unless $no_comments;
	139	$create .= qq[DROP TABLE $table_name;\n] if $add_drop_table;
4d438549	140	$create .= "CREATE ${temp}TABLE $table_name (\n";
bfb5a568	141
	142	#
	143	# Comments
	144	#
	145	if ( $table->comments and !$no_comments ){
	146	$create .= "-- Comments: \n-- ";
	147	$create .= join "\n-- ", $table->comments;
	148	$create .= "\n--\n\n";
	149	}
	150
	151	#
	152	# How many fields in PK?
	153	#
	154	my $pk = $table->primary_key;
	155	my @pk_fields = $pk ? $pk->fields : ();
	156
	157	#
	158	# Fields
	159	#
	160	my ( @field_defs, $pk_set );
	161	for my $field ( @fields ) {
	162	push @field_defs, create_field($field);
	163	}
	164
	165	if (
	166	scalar @pk_fields > 1
	167	\|\|
	168	( @pk_fields && !grep /INTEGER PRIMARY KEY/, @field_defs )
	169	) {
	170	push @field_defs, 'PRIMARY KEY (' . join(', ', @pk_fields ) . ')';
	171	}
	172
	173	#
	174	# Indices
	175	#
	176	my $idx_name_default = 'A';
	177	for my $index ( $table->get_indices ) {
	178	push @index_defs, create_index($index);
	179	}
	180
	181	#
	182	# Constraints
	183	#
	184	my $c_name_default = 'A';
	185	for my $c ( $table->get_constraints ) {
	186	next unless $c->type eq UNIQUE;
	187	push @constraint_defs, create_constraint($c);
	188	}
	189
4d438549	190	$create .= join(",\n", map { " $_" } @field_defs ) . "\n)";
bfb5a568	191
4d438549	192	return ($create, @index_defs, @constraint_defs, @trigger_defs );
bfb5a568	193	}
	194
	195	sub create_field
	196	{
	197	my ($field, $options) = @_;
	198
	199	my $field_name = $field->name;
	200	debug("PKG: Looking at field '$field_name'\n");
	201	my $field_comments = $field->comments
	202	? "-- " . $field->comments . "\n "
	203	: '';
	204
	205	my $field_def = $field_comments.$field_name;
	206
	207	# data type and size
	208	my $size = $field->size;
	209	my $data_type = $field->data_type;
	210	$data_type = 'varchar' if lc $data_type eq 'set';
	211	$data_type = 'blob' if lc $data_type eq 'bytea';
	212
	213	if ( lc $data_type =~ /(text\|blob)/i ) {
	214	$size = undef;
	215	}
	216
	217	# if ( $data_type =~ /timestamp/i ) {
	218	# push @trigger_defs,
	219	# "CREATE TRIGGER ts_${table_name} ".
	220	# "after insert on $table_name\n".
	221	# "begin\n".
	222	# " update $table_name set $field_name=timestamp() ".
	223	# "where id=new.id;\n".
	224	# "end;\n"
	225	# ;
	226	#
	227	# }
	228
	229	#
	230	# SQLite is generally typeless, but newer versions will
	231	# make a field autoincrement if it is declared as (and
	232	# only as) INTEGER PRIMARY KEY
	233	#
	234	my $pk = $field->table->primary_key;
	235	my @pk_fields = $pk ? $pk->fields : ();
	236
	237	if (
	238	$field->is_primary_key &&
	239	scalar @pk_fields == 1 &&
	240	(
	241	$data_type =~ /int(eger)?$/i
	242	\|\|
	243	( $data_type =~ /^number?$/i && $size !~ /,/ )
	244	)
	245	) {
	246	$data_type = 'INTEGER PRIMARY KEY';
	247	$size = undef;
	248	# $pk_set = 1;
	249	}
	250
	251	$field_def .= sprintf " %s%s", $data_type,
	252	( !$field->is_auto_increment && $size ) ? "($size)" : '';
	253
	254	# Null?
	255	$field_def .= ' NOT NULL' unless $field->is_nullable;
	256
257	# Default? XXX Need better quoting!
258	my $default = $field->default_value;
259	if ( defined $default ) {
260	if ( uc $default eq 'NULL') {
261	$field_def .= ' DEFAULT NULL';
262	} elsif ( $default eq 'now()' \|\|
263	$default eq 'CURRENT_TIMESTAMP' ) {
264	$field_def .= ' DEFAULT CURRENT_TIMESTAMP';
265	} elsif ( $default =~ /val\(/ ) {
266	next;
267	} else {
268	$field_def .= " DEFAULT '$default'";
269	}
270	}
271
272	return $field_def;
273
274	}
275
276	sub create_index
277	{
278	my ($index, $options) = @_;
279
280	my $name = $index->name;
4d438549	281	$name = mk_name($index->table->name, $name);
	282
	283	my $type = $index->type eq 'UNIQUE' ? "UNIQUE " : '';
bfb5a568	284
	285	# strip any field size qualifiers as SQLite doesn't like these
	286	my @fields = map { s/\(\d+\)$//; $_ } $index->fields;
cc74bccc	287	(my $index_table_name = $index->table->name) =~ s/^.+?\.//; # table name may not specify schema
cc74bccc	288	warn "removing schema name from '" . $index->table->name . "' to make '$index_table_name'\n" if $WARN;
bfb5a568	289	my $index_def =
907f8cea	290	"CREATE ${type}INDEX $name ON " . $index_table_name .
907f8cea	291	' (' . join( ', ', @fields ) . ')';
bfb5a568	292
	293	return $index_def;
	294	}
	295
	296	sub create_constraint
	297	{
	298	my ($c, $options) = @_;
	299
	300	my $name = $c->name;
4d438549	301	$name = mk_name($c->table->name, $name);
bfb5a568	302	my @fields = $c->fields;
cc74bccc	303	(my $index_table_name = $c->table->name) =~ s/^.+?\.//; # table name may not specify schema
cc74bccc	304	warn "removing schema name from '" . $c->table->name . "' to make '$index_table_name'\n" if $WARN;
bfb5a568	305
bfb5a568	306	my $c_def =
907f8cea	307	"CREATE UNIQUE INDEX $name ON " . $index_table_name .
907f8cea	308	' (' . join( ', ', @fields ) . ')';
bfb5a568	309
	310	return $c_def;
	311	}
	312
4d438549	313	sub alter_table { } # Noop
	314
	315	sub add_field {
	316	my ($field) = @_;
	317
	318	return sprintf("ALTER TABLE %s ADD COLUMN %s",
	319	$field->table->name, create_field($field))
	320	}
	321
	322	sub alter_create_index {
	323	my ($index) = @_;
	324
	325	# This might cause name collisions
	326	return create_index($index);
	327	}
	328
	329	sub alter_create_constraint {
	330	my ($constraint) = @_;
	331
	332	return create_constraint($constraint) if $constraint->type eq 'UNIQUE';
	333	}
	334
	335	sub alter_drop_constraint { alter_drop_index(@_) }
	336
	337	sub alter_drop_index {
	338	my ($constraint) = @_;
	339
	340	return sprintf("DROP INDEX %s ON %s",
	341	$constraint->name, $constraint->table->name);
	342	}
	343
	344	sub batch_alter_table {
	345	my ($table, $diffs) = @_;
	346
4d438549	347	# If we have any of the following
	348	#
	349	# rename_field
	350	# alter_field
	351	# drop_field
	352	#
	353	# we need to do the following <http://www.sqlite.org/faq.html#q11>
	354	#
	355	# BEGIN TRANSACTION;
	356	# CREATE TEMPORARY TABLE t1_backup(a,b);
	357	# INSERT INTO t1_backup SELECT a,b FROM t1;
	358	# DROP TABLE t1;
	359	# CREATE TABLE t1(a,b);
	360	# INSERT INTO t1 SELECT a,b FROM t1_backup;
	361	# DROP TABLE t1_backup;
	362	# COMMIT;
	363	#
	364	# Fun, eh?
46bf5655	365	#
	366	# If we have rename_field we do similarly.
	367
	368	my $table_name = $table->name;
	369	my $renaming = $diffs->{rename_table} && @{$diffs->{rename_table}};
4d438549	370
	371	if ( @{$diffs->{rename_field}} == 0 &&
	372	@{$diffs->{alter_field}} == 0 &&
46bf5655	373	@{$diffs->{drop_field}} == 0
46bf5655	374	) {
4d438549	375	return join("\n", map {
	376	my $meth = __PACKAGE__->can($_) or die __PACKAGE__ . " cant $_";
	377	map { my $sql = $meth->(ref $_ eq 'ARRAY' ? @$_ : $_); $sql ? ("$sql;") : () } @{ $diffs->{$_} }
	378
46bf5655	379	} grep { @{$diffs->{$_}} }
	380	qw/rename_table
	381	alter_drop_constraint
	382	alter_drop_index
	383	drop_field
	384	add_field
	385	alter_field
	386	rename_field
	387	alter_create_index
	388	alter_create_constraint
	389	alter_table/);
4d438549	390	}
	391
	392
	393	my @sql;
46bf5655	394	my $old_table = $renaming ? $diffs->{rename_table}[0][0] : $table;
4d438549	395
4d438549	396	do {
46bf5655	397	local $table->{name} = $table_name . '_temp_alter';
4d438549	398	# We only want the table - dont care about indexes on tmp table
	399	my ($table_sql) = create_table($table, {no_comments => 1, temporary_table => 1});
	400	push @sql,$table_sql;
	401	};
	402
46bf5655	403	push @sql, "INSERT INTO @{[$table_name]}_temp_alter SELECT @{[ join(', ', $old_table->get_fields)]} FROM @{[$old_table]}",
46bf5655	404	"DROP TABLE @{[$old_table]}",
4d438549	405	create_table($table, { no_comments => 1 }),
46bf5655	406	"INSERT INTO @{[$table_name]} SELECT @{[ join(', ', $old_table->get_fields)]} FROM @{[$table_name]}_temp_alter",
46bf5655	407	"DROP TABLE @{[$table_name]}_temp_alter";
4d438549	408
	409	return join(";\n", @sql, "");
	410	}
	411
	412	sub drop_table {
	413	my ($table) = @_;
	414	return "DROP TABLE $table;";
	415	}
	416
46bf5655	417	sub rename_table {
	418	my ($old_table, $new_table, $options) = @_;
	419
	420	my $qt = $options->{quote_table_names} \|\| '';
	421
	422	return "ALTER TABLE $qt$old_table$qt RENAME TO $qt$new_table$qt";
	423
	424	}
	425
bfb5a568	426	1;
758ab1cd	427
20770e44	428	=pod
	429
	430	=head1 SEE ALSO
	431
	432	SQL::Translator, http://www.sqlite.org/.
758ab1cd	433
	434	=head1 AUTHOR
	435
4d438549	436	Ken Y. Clark C<< <kclark@cpan.orgE> >>.
	437
	438	Diff code added by Ash Berlin C<< <ash@cpan.org> >>.
20770e44	439
20770e44	440	=cut