X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FSQL%2FTranslator%2FProducer%2FPostgreSQL.pm;h=8c0ec5d6d1ea6298368b5617279e36ddfe8b8c4b;hb=ad2587769ab392b8916e17bf9b3afb3e2efdfe99;hp=1c995b9ac794842fe9b19a414e2732deeb119d8e;hpb=50840472b86d71a07ebda8332c4b1bcd74dab01b;p=dbsrgits%2FSQL-Translator.git

diff --git a/lib/SQL/Translator/Producer/PostgreSQL.pm b/lib/SQL/Translator/Producer/PostgreSQL.pm
index 1c995b9..8c0ec5d 100644
--- a/lib/SQL/Translator/Producer/PostgreSQL.pm
+++ b/lib/SQL/Translator/Producer/PostgreSQL.pm
@@ -1,11 +1,7 @@
 package SQL::Translator::Producer::PostgreSQL;
 
 # -------------------------------------------------------------------
-# $Id: PostgreSQL.pm,v 1.13 2003-08-17 00:46:23 rossta Exp $
-# -------------------------------------------------------------------
-# Copyright (C) 2003 Ken Y. Clark <kclark@cpan.org>,
-#                    darren chamberlain <darren@cpan.org>,
-#                    Chris Mungall <cjm@fruitfly.org>
+# 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
@@ -26,30 +22,47 @@ package SQL::Translator::Producer::PostgreSQL;
 
 SQL::Translator::Producer::PostgreSQL - PostgreSQL producer for SQL::Translator
 
+=head1 SYNOPSIS
+
+  my $t = SQL::Translator->new( parser => '...', producer => 'PostgreSQL' );
+  $t->translate;
+
+=head1 DESCRIPTION
+
+Creates a DDL suitable for PostgreSQL.  Very heavily based on the Oracle
+producer.
+
 =cut
 
 use strict;
-use vars qw[ $DEBUG $WARN $VERSION ];
-$VERSION = sprintf "%d.%02d", q$Revision: 1.13 $ =~ /(\d+)\.(\d+)/;
-$DEBUG = 1 unless defined $DEBUG;
+use warnings;
+use vars qw[ $DEBUG $WARN $VERSION %used_names ];
+$VERSION = '1.59';
+$DEBUG = 0 unless defined $DEBUG;
 
+use base qw(SQL::Translator::Producer);
 use SQL::Translator::Schema::Constants;
-use SQL::Translator::Utils qw(header_comment);
+use SQL::Translator::Utils qw(debug header_comment);
 use Data::Dumper;
 
-my %translate  = (
+my %translate;
+my $max_id_length;
+
+BEGIN {
+
+ %translate  = (
     #
     # MySQL types
     #
     bigint     => 'bigint',
-    double     => 'double precision',
-    decimal    => 'decimal',
-    float      => 'double precision',
+    double     => 'numeric',
+    decimal    => 'numeric',
+    float      => 'numeric',
     int        => 'integer',
     mediumint  => 'integer',
     smallint   => 'smallint',
     tinyint    => 'smallint',
-    char       => 'char',
+    char       => 'character',
     varchar    => 'character varying',
     longtext   => 'text',
     mediumtext => 'text',
@@ -63,7 +76,7 @@ my %translate  = (
     set        => 'character varying',
     date       => 'date',
     datetime   => 'timestamp',
-    time       => 'date',
+    time       => 'time',
     timestamp  => 'timestamp',
     year       => 'date',
 
@@ -71,7 +84,7 @@ my %translate  = (
     # Oracle types
     #
     number     => 'integer',
-    char       => 'char',
+    char       => 'character',
     varchar2   => 'character varying',
     long       => 'text',
     CLOB       => 'bytea',
@@ -85,13 +98,15 @@ my %translate  = (
     varchar    => 'character varying',
     datetime   => 'timestamp',
     text       => 'text',
-    real       => 'double precision',
+    real       => 'numeric',
     comment    => 'text',
     bit        => 'bit',
     tinyint    => 'smallint',
-    float      => 'double precision',
+    float      => 'numeric',
 );
 
+ $max_id_length = 62;
+}
 my %reserved = map { $_, 1 } qw[
     ALL ANALYSE ANALYZE AND ANY AS ASC 
     BETWEEN BINARY BOTH
@@ -110,7 +125,7 @@ my %reserved = map { $_, 1 } qw[
     UNION UNIQUE USER USING VERBOSE WHEN WHERE
 ];
 
-my $max_id_length    = 30;
+# my $max_id_length    = 62;
 my %used_identifiers = ();
 my %global_names;
 my %unreserve;
@@ -160,256 +175,51 @@ and table_constraint is:
 # -------------------------------------------------------------------
 sub produce {
     my $translator     = shift;
-    $DEBUG             = $translator->debug;
-    $WARN              = $translator->show_warnings;
+    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 $pargs          = $translator->producer_args;
+    local %used_names  = ();
 
-    my $output;
-    $output .= header_comment unless ($no_comments);
-    my %used_index_names;
-
-    for my $table ( $schema->get_tables ) {
-        my $table_name    = $table->name or next;
-        $table_name       = mk_name( $table_name, '', undef, 1 );
-        my $table_name_ur = unreserve($table_name);
-
-        my ( @comments, @field_defs, @sequence_defs, @constraint_defs );
-
-        push @comments, "--\n-- Table: $table_name_ur\n--" unless $no_comments;
-
-        #
-        # Fields
-        #
-        my %field_name_scope;
-        for my $field ( $table->get_fields ) {
-            my $field_name    = mk_name(
-                $field->name, '', \%field_name_scope, 1 
-            );
-            my $field_name_ur = unreserve( $field_name, $table_name );
-            my $field_def     = qq["$field_name_ur"];
-
-            #
-            # Datatype
-            #
-            my @size      = $field->size;
-            my $data_type = lc $field->data_type;
-            my %extra     = $field->extra;
-            my $list      = $extra{'list'} || [];
-            # \todo deal with embedded quotes
-            my $commalist = "'" . join("','", @$list) . "'";
-            my $seq_name;
-
-            if ( $data_type eq 'enum' ) {
-                my $len = 0;
-                $len = ($len < length($_)) ? length($_) : $len for (@$list);
-                my $check_name = mk_name( $table_name.'_'.$field_name, 'chk' );
-                push @constraint_defs, 
-                "CONSTRAINT $check_name CHECK (\"$field_name\" IN ($commalist))";
-                $data_type = 'character varying';
-            }
-            elsif ( $data_type eq 'set' ) {
-                # XXX add a CHECK constraint maybe 
-                # (trickier and slower, than enum :)
-#                my $len     = length $commalist;
-#                $field_def .= " character varying($len) /* set $commalist */";
-                $data_type = 'character varying';
-            }
-            elsif ( $field->is_auto_increment ) {
-                if ( defined $size[0] && $size[0] > 11 ) {
-                    $data_type = ' bigserial';
-                }
-                else {
-                    $data_type = ' serial';
-                }
-                undef @size;
-
-#                $seq_name   = mk_name( $table_name.'_'.$field_name, 'sq' );
-#                push @sequence_defs, qq[DROP SEQUENCE "$seq_name";];
-#                push @sequence_defs, qq[CREATE SEQUENCE "$seq_name";];
-            }
-            else {
-                $data_type  = defined $translate{ $data_type } ?
-                              $translate{ $data_type } :
-                              $data_type;
-            }
-
-            if ( $data_type =~ /timestamp/i ) {
-                if ( defined $size[0] && $size[0] > 13 ) {
-                    $size[0] = 13;
-                }
-            }
-
-            if ( $data_type eq 'integer' ) {
-                if ( defined $size[0] ) {
-                    if ( $size[0] > 10 ) { # 
-                        $data_type = ' bigint';
-                    }
-                    elsif ( $size[0] < 5 ) {
-                        $data_type = ' smallint';
-                    }
-                    else {
-                        $data_type = ' integer';
-                    }
-                }
-                else {
-                    $data_type = ' integer';
-                }
-                undef @size;
-            }
-            
-            $field_def .= " $data_type";
-
-            if ( defined $size[0] && $size[0] > 0 ) {
-                $field_def .= '(' . join( ', ', @size ) . ')';
-            }
-
-            #
-            # Default value
-            #
-            my $default = $field->default_value;
-            if ( defined $default ) {
-                $field_def .= sprintf( ' DEFAULT %s',
-                    ( $field->is_auto_increment && $seq_name )
-                    ? qq[nextval('"$seq_name"'::text)] :
-                    ( $default =~ m/null/i ) ? 'NULL' : "'$default'"
-                );
-            }
-
-            #
-            # Not null constraint
-            #
-            $field_def .= ' NOT NULL' unless $field->is_nullable;
-
-            push @field_defs, $field_def;
-        }
-
-        #
-        # Index Declarations
-        #
-        my @index_defs = ();
-        my $idx_name_default;
-        for my $index ( $table->get_indices ) {
-            my $name = $index->name || '';
-            my $type = $index->type || NORMAL;
-            my @fields     = 
-                map { $_ =~ s/\(.+\)//; $_ }
-                map { unreserve( $_, $table_name ) }
-                $index->fields;
-            next unless @fields;
-
-            if ( $type eq PRIMARY_KEY ) {
-                $name ||= mk_name( $table_name, 'pk' );
-                $name = next_unused_name($name, \%used_index_names);
-                # how do I get next_unused_name() to do: ?
-                $used_index_names{$name} = $name;
-                push @constraint_defs, 'CONSTRAINT '.$name.' PRIMARY KEY '.
-                    '("' . join( '", "', @fields ) . '")';
-            }
-            elsif ( $type eq UNIQUE ) {
-                $name ||= mk_name( 
-                    $table_name, $name || ++$idx_name_default
-                );
-                $name = next_unused_name($name, \%used_index_names);
-                $used_index_names{$name} = $name;
-                push @constraint_defs, 'CONSTRAINT ' . $name . ' UNIQUE ' .
-                    '("' . join( '", "', @fields ) . '")';
-            }
-            elsif ( $type eq NORMAL ) {
-                $name ||= mk_name( 
-                    $table_name, $name || ++$idx_name_default
-                );
-                $name = next_unused_name($name, \%used_index_names);
-                $used_index_names{$name} = $name;
-                push @index_defs, 
-                    qq[CREATE INDEX "$name" on $table_name_ur ("].
-                        join( '", "', @fields ).  
-                    '");'; 
-            }
-            else {
-                warn "Unknown index type ($type) on table $table_name.\n"
-                    if $WARN;
-            }
-        }
-
-        #
-        # Table constraints
-        #
-        my $c_name_default;
-        for my $c ( $table->get_constraints ) {
-            my $name = $c->name || '';
-            my @fields     = 
-                map { $_ =~ s/\(.+\)//; $_ }
-                map { unreserve( $_, $table_name ) }
-                $c->fields;
-            my @rfields     = 
-                map { $_ =~ s/\(.+\)//; $_ }
-                map { unreserve( $_, $table_name ) }
-                $c->reference_fields;
-            next unless @fields;
-
-            if ( $c->type eq PRIMARY_KEY ) {
-                $name ||= mk_name( $table_name, 'pk' );
-                $name = next_unused_name($name, \%used_index_names);
-                $used_index_names{$name} = $name;
-                push @constraint_defs, "CONSTRAINT $name PRIMARY KEY ".
-                    '("' . join( '", "', @fields ) . '")';
-            }
-            elsif ( $c->type eq UNIQUE ) {
-                $name ||= mk_name( 
-                    $table_name, $name || ++$c_name_default
-                );
-                $name = next_unused_name($name, \%used_index_names);
-                $used_index_names{$name} = $name;
-                push @constraint_defs, "CONSTRAINT $name UNIQUE " .
-                    '("' . join( '", "', @fields ) . '")';
-            }
-            elsif ( $c->type eq FOREIGN_KEY ) {
-                my $def = join(' ', 
-                    map { $_ || () } 'FOREIGN KEY', $c->name 
-                );
+    my $postgres_version = $pargs->{postgres_version} || 0;
 
-                $def .= ' ("' . join( '", "', @fields ) . '")';
-
-                $def .= ' REFERENCES ' . $c->reference_table;
-
-                if ( @rfields ) {
-                    $def .= ' ("' . join( '", "', @rfields ) . '")';
-                }
+    my $qt = '';
+    $qt = '"' if ($translator->quote_table_names);
+    my $qf = '';
+    $qf = '"' if ($translator->quote_field_names);
+    
+    my @output;
+    push @output, header_comment unless ($no_comments);
 
-                if ( $c->match_type ) {
-                    $def .= ' MATCH ' . 
-                        ( $c->match_type =~ /full/i ) ? 'FULL' : 'PARTIAL';
-                }
+    my (@table_defs, @fks);
+    for my $table ( $schema->get_tables ) {
 
-                if ( $c->on_delete ) {
-                    $def .= ' ON DELETE '.join( ' ', $c->on_delete );
-                }
+        my ($table_def, $fks) = create_table($table, 
+                                             { quote_table_names => $qt,
+                                               quote_field_names => $qf,
+                                               no_comments => $no_comments,
+                                               postgres_version => $postgres_version,
+                                               add_drop_table => $add_drop_table,});
+        push @table_defs, $table_def;
+        push @fks, @$fks;
 
-                if ( $c->on_update ) {
-                    $def .= ' ON UPDATE '.join( ' ', $c->on_update );
-                }
+    }
 
-                push @constraint_defs, $def;
-            }
-        }
+    for my $view ( $schema->get_views ) {
+      push @table_defs, create_view($view, {
+        add_drop_view     => $add_drop_table,
+        quote_table_names => $qt,
+        quote_field_names => $qf,
+        no_comments       => $no_comments,
+      });
+    }
 
-        my $create_statement;
-        $create_statement  = qq[DROP TABLE "$table_name_ur";\n] 
-            if $add_drop_table;
-        $create_statement .= qq[CREATE TABLE "$table_name_ur" (\n].
-            join( ",\n", map { "  $_" } @field_defs, @constraint_defs ).
-            "\n);"
-        ;
-
-        $output .= join( "\n\n", 
-            @comments,
-            @sequence_defs, 
-            $create_statement, 
-            @index_defs, 
-            '' 
-        );
+    push @output, map { "$_;\n\n" } @table_defs;
+    if ( @fks ) {
+        push @output, "--\n-- Foreign Key Definitions\n--\n\n" unless $no_comments;
+        push @output, map { "$_;\n\n" } @fks;
     }
 
     if ( $WARN ) {
@@ -425,7 +235,9 @@ sub produce {
         }
     }
 
-    return $output;
+    return wantarray
+        ? @output
+        : join ('', @output);
 }
 
 # -------------------------------------------------------------------
@@ -435,6 +247,7 @@ sub mk_name {
     my $scope         = shift || ''; 
     my $critical      = shift || '';
     my $basename_orig = $basename;
+#    my $max_id_length = 62;
     my $max_name      = $type 
                         ? $max_id_length - (length($type) + 1) 
                         : $max_id_length;
@@ -474,7 +287,7 @@ sub unreserve {
     my ( $suffix ) = ( $name =~ s/(\W.*)$// ) ? $1 : '';
 
     # also trap fields that don't begin with a letter
-    return $name if !$reserved{ uc $name } && $name =~ /^[a-z]/i; 
+    return $name if (!$reserved{ uc $name }) && $name =~ /^[a-z]/i; 
 
     if ( $schema_obj_name ) {
         ++$unreserve{"$schema_obj_name.$name"};
@@ -489,18 +302,14 @@ sub unreserve {
 
 # -------------------------------------------------------------------
 sub next_unused_name {
-    my $name       = shift || '';
-    my $used_names = shift || '';
-
-    my %used_names = %$used_names;
-
-    if ( !defined($used_names{$name}) ) {
+    my $name = shift || '';
+    if ( !defined( $used_names{$name} ) ) {
         $used_names{$name} = $name;
         return $name;
     }
-    
+
     my $i = 2;
-    while ( defined($used_names{$name . $i}) ) {
+    while ( defined( $used_names{ $name . $i } ) ) {
         ++$i;
     }
     $name .= $i;
@@ -508,6 +317,570 @@ sub next_unused_name {
     return $name;
 }
 
+
+sub create_table 
+{
+    my ($table, $options) = @_;
+
+    my $qt = $options->{quote_table_names} || '';
+    my $qf = $options->{quote_field_names} || '';
+    my $no_comments = $options->{no_comments} || 0;
+    my $add_drop_table = $options->{add_drop_table} || 0;
+    my $postgres_version = $options->{postgres_version} || 0;
+
+    my $table_name = $table->name or next;
+    my ( $fql_tbl_name ) = ( $table_name =~ s/\W(.*)$// ) ? $1 : q{};
+    my $table_name_ur = $qt ? $table_name
+        : $fql_tbl_name ? join('.', $table_name, unreserve($fql_tbl_name))
+        : unreserve($table_name);
+    $table->name($table_name_ur);
+
+# print STDERR "$table_name table_name\n";
+    my ( @comments, @field_defs, @sequence_defs, @constraint_defs, @type_defs, @type_drops, @fks );
+
+    push @comments, "--\n-- Table: $table_name_ur\n--\n" unless $no_comments;
+
+    if ( $table->comments and !$no_comments ){
+        my $c = "-- Comments: \n-- ";
+        $c .= join "\n-- ",  $table->comments;
+        $c .= "\n--\n";
+        push @comments, $c;
+    }
+
+    #
+    # Fields
+    #
+    my %field_name_scope;
+    for my $field ( $table->get_fields ) {
+        push @field_defs, create_field($field, { quote_table_names => $qt,
+                                                 quote_field_names => $qf,
+                                                 table_name => $table_name_ur,
+                                                 postgres_version => $postgres_version,
+                                                 type_defs => \@type_defs,
+                                                 type_drops => \@type_drops,
+                                                 constraint_defs => \@constraint_defs,});
+    }
+
+    #
+    # Index Declarations
+    #
+    my @index_defs = ();
+ #   my $idx_name_default;
+    for my $index ( $table->get_indices ) {
+        my ($idef, $constraints) = create_index($index,
+                                              { 
+                                                  quote_field_names => $qf,
+                                                  quote_table_names => $qt,
+                                                  table_name => $table_name,
+                                              });
+        $idef and push @index_defs, $idef;
+        push @constraint_defs, @$constraints;
+    }
+
+    #
+    # Table constraints
+    #
+    my $c_name_default;
+    for my $c ( $table->get_constraints ) {
+        my ($cdefs, $fks) = create_constraint($c, 
+                                              { 
+                                                  quote_field_names => $qf,
+                                                  quote_table_names => $qt,
+                                                  table_name => $table_name,
+                                              });
+        push @constraint_defs, @$cdefs;
+        push @fks, @$fks;
+    }
+
+
+    my $temporary = "";
+
+    if(exists $table->{extra}{temporary}) {
+        $temporary = $table->{extra}{temporary} ? "TEMPORARY " : "";
+    } 
+
+    my $create_statement;
+    $create_statement = join("\n", @comments);
+    if ($add_drop_table) {
+        if ($postgres_version >= 8.2) {
+            $create_statement .= qq[DROP TABLE IF EXISTS $qt$table_name_ur$qt CASCADE;\n];
+            $create_statement .= join (";\n", @type_drops) . ";\n"
+                if $postgres_version >= 8.3 && scalar @type_drops;
+        } else {
+            $create_statement .= qq[DROP TABLE $qt$table_name_ur$qt CASCADE;\n];
+        }
+    }
+    $create_statement .= join(";\n", @type_defs) . ";\n"
+        if $postgres_version >= 8.3 && scalar @type_defs;
+    $create_statement .= qq[CREATE ${temporary}TABLE $qt$table_name_ur$qt (\n].
+                            join( ",\n", map { "  $_" } @field_defs, @constraint_defs ).
+                            "\n)"
+                            ;
+    $create_statement .= @index_defs ? ';' : q{};
+    $create_statement .= ( $create_statement =~ /;$/ ? "\n" : q{} )
+        . join(";\n", @index_defs);
+
+    return $create_statement, \@fks;
+}
+
+sub create_view {
+    my ($view, $options) = @_;
+    my $qt = $options->{quote_table_names} || '';
+    my $qf = $options->{quote_field_names} || '';
+    my $add_drop_view = $options->{add_drop_view};
+
+    my $view_name = $view->name;
+    debug("PKG: Looking at view '${view_name}'\n");
+
+    my $create = '';
+    $create .= "--\n-- View: ${qt}${view_name}${qt}\n--\n"
+        unless $options->{no_comments};
+    $create .= "DROP VIEW ${qt}${view_name}${qt};\n" if $add_drop_view;
+    $create .= 'CREATE';
+
+    my $extra = $view->extra;
+    $create .= " TEMPORARY" if exists($extra->{temporary}) && $extra->{temporary};
+    $create .= " VIEW ${qt}${view_name}${qt}";
+
+    if ( my @fields = $view->fields ) {
+        my $field_list = join ', ', map { "${qf}${_}${qf}" } @fields;
+        $create .= " ( ${field_list} )";
+    }
+
+    if ( my $sql = $view->sql ) {
+        $create .= " AS\n    ${sql}\n";
+    }
+
+    if ( $extra->{check_option} ) {
+        $create .= ' WITH ' . uc $extra->{check_option} . ' CHECK OPTION';
+    }
+
+    return $create;
+}
+
+{ 
+
+    my %field_name_scope;
+
+    sub create_field
+    {
+        my ($field, $options) = @_;
+
+        my $qt = $options->{quote_table_names} || '';
+        my $qf = $options->{quote_field_names} || '';
+        my $table_name = $field->table->name;
+        my $constraint_defs = $options->{constraint_defs} || [];
+        my $postgres_version = $options->{postgres_version} || 0;
+        my $type_defs = $options->{type_defs} || [];
+        my $type_drops = $options->{type_drops} || [];
+
+        $field_name_scope{$table_name} ||= {};
+        my $field_name    = $field->name;
+        my $field_name_ur = $qf ? $field_name : unreserve($field_name, $table_name );
+        $field->name($field_name_ur);
+        my $field_comments = $field->comments 
+            ? "-- " . $field->comments . "\n  " 
+            : '';
+
+        my $field_def     = $field_comments.qq[$qf$field_name_ur$qf];
+
+        #
+        # Datatype
+        #
+        my @size      = $field->size;
+        my $data_type = lc $field->data_type;
+        my %extra     = $field->extra;
+        my $list      = $extra{'list'} || [];
+        # todo deal with embedded quotes
+        my $commalist = join( ', ', map { qq['$_'] } @$list );
+
+        if ($postgres_version >= 8.3 && $field->data_type eq 'enum') {
+            my $type_name = $field->table->name . '_' . $field->name . '_type';
+            $field_def .= ' '. $type_name;
+            push @$type_defs, "CREATE TYPE $type_name AS ENUM ($commalist)";
+            push @$type_drops, "DROP TYPE IF EXISTS $type_name";
+        } else {
+            $field_def .= ' '. convert_datatype($field);
+        }
+
+        #
+        # Default value 
+        #
+        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',
+              ],
+            );
+        }
+
+        #
+        # Not null constraint
+        #
+        $field_def .= ' NOT NULL' unless $field->is_nullable;
+
+        return $field_def;
+    }
+}
+
+    sub create_index
+    {
+        my ($index, $options) = @_;
+
+        my $qt = $options->{quote_table_names} ||'';
+        my $qf = $options->{quote_field_names} ||'';
+        my $table_name = $index->table->name;
+#        my $table_name_ur = $qt ? unreserve($table_name) : $table_name;
+
+        my ($index_def, @constraint_defs);
+
+        my $name = $index->name || '';
+        if ( $name ) {
+            $name = next_unused_name($name);
+        }
+
+        my $type = $index->type || NORMAL;
+        my @fields     = 
+            map { $_ =~ s/\(.+\)//; $_ }
+        map { $qt ? $_ : unreserve($_, $table_name ) }
+        $index->fields;
+        next unless @fields;
+
+        my $def_start = qq[CONSTRAINT "$name" ];
+        if ( $type eq PRIMARY_KEY ) {
+            push @constraint_defs, "${def_start}PRIMARY KEY ".
+                '(' .$qf . join( $qf. ', '.$qf, @fields ) . $qf . ')';
+        }
+        elsif ( $type eq UNIQUE ) {
+            push @constraint_defs, "${def_start}UNIQUE " .
+                '(' . $qf . join( $qf. ', '.$qf, @fields ) . $qf.')';
+        }
+        elsif ( $type eq NORMAL ) {
+            $index_def = 
+                "CREATE INDEX ${qf}${name}${qf} on ${qt}${table_name}${qt} (".
+                join( ', ', map { qq[$qf$_$qf] } @fields ).  
+                ')'
+                ; 
+        }
+        else {
+            warn "Unknown index type ($type) on table $table_name.\n"
+                if $WARN;
+        }
+
+        return $index_def, \@constraint_defs;
+    }
+
+    sub create_constraint
+    {
+        my ($c, $options) = @_;
+
+        my $qf = $options->{quote_field_names} ||'';
+        my $qt = $options->{quote_table_names} ||'';
+        my $table_name = $c->table->name;
+        my (@constraint_defs, @fks);
+
+        my $name = $c->name || '';
+        if ( $name ) {
+            $name = next_unused_name($name);
+        }
+
+        my @fields     = 
+            map { $_ =~ s/\(.+\)//; $_ }
+        map { $qt ? $_ : unreserve( $_, $table_name )}
+        $c->fields;
+
+        my @rfields     = 
+            map { $_ =~ s/\(.+\)//; $_ }
+        map { $qt ? $_ : unreserve( $_, $table_name )}
+        $c->reference_fields;
+
+        next if !@fields && $c->type ne CHECK_C;
+        my $def_start = $name ? qq[CONSTRAINT "$name" ] : '';
+        if ( $c->type eq PRIMARY_KEY ) {
+            push @constraint_defs, "${def_start}PRIMARY KEY ".
+                '('.$qf . join( $qf.', '.$qf, @fields ) . $qf.')';
+        }
+        elsif ( $c->type eq UNIQUE ) {
+            $name = next_unused_name($name);
+            push @constraint_defs, "${def_start}UNIQUE " .
+                '('.$qf . join( $qf.', '.$qf, @fields ) . $qf.')';
+        }
+        elsif ( $c->type eq CHECK_C ) {
+            my $expression = $c->expression;
+            push @constraint_defs, "${def_start}CHECK ($expression)";
+        }
+        elsif ( $c->type eq FOREIGN_KEY ) {
+            my $def .= "ALTER TABLE ${qt}${table_name}${qt} ADD FOREIGN KEY (" . 
+                join( ', ', map { qq[$qf$_$qf] } @fields ) . ')' .
+                "\n  REFERENCES " . $qt . $c->reference_table . $qt;
+
+            if ( @rfields ) {
+                $def .= ' ('.$qf . join( $qf.', '.$qf, @rfields ) . $qf.')';
+            }
+
+            if ( $c->match_type ) {
+                $def .= ' MATCH ' . 
+                    ( $c->match_type =~ /full/i ) ? 'FULL' : 'PARTIAL';
+            }
+
+            if ( $c->on_delete ) {
+                $def .= ' ON DELETE '.join( ' ', $c->on_delete );
+            }
+
+            if ( $c->on_update ) {
+                $def .= ' ON UPDATE '.join( ' ', $c->on_update );
+            }
+
+            if ( $c->deferrable ) {
+                $def .= ' DEFERRABLE';
+            }
+
+            push @fks, "$def";
+        }
+
+        return \@constraint_defs, \@fks;
+    }
+
+sub convert_datatype
+{
+    my ($field) = @_;
+
+    my @size      = $field->size;
+    my $data_type = lc $field->data_type;
+
+    if ( $data_type eq 'enum' ) {
+#        my $len = 0;
+#        $len = ($len < length($_)) ? length($_) : $len for (@$list);
+#        my $chk_name = mk_name( $table_name.'_'.$field_name, 'chk' );
+#        push @$constraint_defs, 
+#        qq[CONSTRAINT "$chk_name" CHECK ($qf$field_name$qf ].
+#           qq[IN ($commalist))];
+        $data_type = 'character varying';
+    }
+    elsif ( $data_type eq 'set' ) {
+        $data_type = 'character varying';
+    }
+    elsif ( $field->is_auto_increment ) {
+        if ( defined $size[0] && $size[0] > 11 ) {
+            $data_type = 'bigserial';
+        }
+        else {
+            $data_type = 'serial';
+        }
+        undef @size;
+    }
+    else {
+        $data_type  = defined $translate{ $data_type } ?
+            $translate{ $data_type } :
+            $data_type;
+    }
+
+    if ( $data_type =~ /^time/i || $data_type =~ /^interval/i ) {
+        if ( defined $size[0] && $size[0] > 6 ) {
+            $size[0] = 6;
+        }
+    }
+
+    if ( $data_type eq 'integer' ) {
+        if ( defined $size[0] && $size[0] > 0) {
+            if ( $size[0] > 10 ) {
+                $data_type = 'bigint';
+            }
+            elsif ( $size[0] < 5 ) {
+                $data_type = 'smallint';
+            }
+            else {
+                $data_type = 'integer';
+            }
+        }
+        else {
+            $data_type = 'integer';
+        }
+    }
+    my @type_without_size = qw/bigint boolean box bytea cidr circle date inet
+                               integer smallint text line lseg macaddr money
+                               path point polygon real/;
+    foreach (@type_without_size) {
+        if ( $data_type =~ qr/$_/ ) {
+            undef @size; last;
+        }
+    }
+
+    if (defined $size[0] && $size[0] > 0 && $data_type =~ /^time/i ) {
+        $data_type =~ s/^(time.*?)( with.*)?$/$1($size[0])/;
+        $data_type .= $2 if(defined $2);
+    } elsif ( defined $size[0] && $size[0] > 0 ) {
+            $data_type .= '(' . join( ',', @size ) . ')';
+    }
+    
+
+
+    return $data_type;
+}
+
+
+sub alter_field
+{
+    my ($from_field, $to_field) = @_;
+
+    die "Can't alter field in another table" 
+        if($from_field->table->name ne $to_field->table->name);
+
+    my @out;
+    push @out, sprintf('ALTER TABLE %s ALTER COLUMN %s SET NOT NULL',
+                       $to_field->table->name,
+                       $to_field->name) if(!$to_field->is_nullable and
+                                           $from_field->is_nullable);
+
+    push @out, sprintf('ALTER TABLE %s ALTER COLUMN %s DROP NOT NULL',
+                      $to_field->table->name,
+                      $to_field->name)
+       if ( !$from_field->is_nullable and $to_field->is_nullable );
+
+
+    my $from_dt = convert_datatype($from_field);
+    my $to_dt   = convert_datatype($to_field);
+    push @out, sprintf('ALTER TABLE %s ALTER COLUMN %s TYPE %s',
+                       $to_field->table->name,
+                       $to_field->name,
+                       $to_dt) if($to_dt ne $from_dt);
+
+    push @out, sprintf('ALTER TABLE %s RENAME COLUMN %s TO %s',
+                       $to_field->table->name,
+                       $from_field->name,
+                       $to_field->name) if($from_field->name ne $to_field->name);
+
+    my $old_default = $from_field->default_value;
+    my $new_default = $to_field->default_value;
+    my $default_value = $to_field->default_value;
+    
+    # fixes bug where output like this was created:
+    # ALTER TABLE users ALTER COLUMN column SET DEFAULT ThisIsUnescaped;
+    if(ref $default_value eq "SCALAR" ) {
+        $default_value = $$default_value;
+    } elsif( defined $default_value && $to_dt =~ /^(character|text)/xsmi ) {
+        $default_value =~ s/'/''/xsmg;
+        $default_value = q(') . $default_value . q(');
+    }
+    
+    push @out, sprintf('ALTER TABLE %s ALTER COLUMN %s SET DEFAULT %s',
+                       $to_field->table->name,
+                       $to_field->name,
+                       $default_value)
+        if ( defined $new_default &&
+             (!defined $old_default || $old_default ne $new_default) );
+
+     # fixes bug where removing the DEFAULT statement of a column
+     # would result in no change
+    
+     push @out, sprintf('ALTER TABLE %s ALTER COLUMN %s DROP DEFAULT',
+                       $to_field->table->name,
+                       $to_field->name)
+        if ( !defined $new_default && defined $old_default );
+    
+
+    return wantarray ? @out : join("\n", @out);
+}
+
+sub rename_field { alter_field(@_) }
+
+sub add_field
+{
+    my ($new_field) = @_;
+
+    my $out = sprintf('ALTER TABLE %s ADD COLUMN %s',
+                      $new_field->table->name,
+                      create_field($new_field));
+    return $out;
+
+}
+
+sub drop_field
+{
+    my ($old_field) = @_;
+
+    my $out = sprintf('ALTER TABLE %s DROP COLUMN %s',
+                      $old_field->table->name,
+                      $old_field->name);
+
+    return $out;    
+}
+
+sub alter_table {
+    my ($to_table, $options) = @_;
+    my $qt = $options->{quote_table_names} || '';
+    my $out = sprintf('ALTER TABLE %s %s',
+                      $qt . $to_table->name . $qt,
+                      $options->{alter_table_action});
+    return $out;
+}
+
+sub rename_table {
+    my ($old_table, $new_table, $options) = @_;
+    my $qt = $options->{quote_table_names} || '';
+    $options->{alter_table_action} = "RENAME TO $qt$new_table$qt";
+    return alter_table($old_table, $options);
+}
+
+sub alter_create_index {
+    my ($index, $options) = @_;
+    my $qt = $options->{quote_table_names} || '';
+    my $qf = $options->{quote_field_names} || '';
+    my ($idef, $constraints) = create_index($index, {
+        quote_field_names => $qf,
+        quote_table_names => $qt,
+        table_name => $index->table->name,
+    });
+    return $index->type eq NORMAL ? $idef
+        : sprintf('ALTER TABLE %s ADD %s',
+              $qt . $index->table->name . $qt,
+              join(q{}, @$constraints)
+          );
+}
+
+sub alter_drop_index {
+    my ($index, $options) = @_;
+    my $index_name = $index->name;
+    return "DROP INDEX $index_name";
+}
+
+sub alter_drop_constraint {
+    my ($c, $options) = @_;
+    my $qt = $options->{quote_table_names} || '';
+    my $qc = $options->{quote_field_names} || '';
+    my $out = sprintf('ALTER TABLE %s DROP CONSTRAINT %s',
+                      $qt . $c->table->name . $qt,
+                      $qc . $c->name . $qc );
+    return $out;
+}
+
+sub alter_create_constraint {
+    my ($index, $options) = @_;
+    my $qt = $options->{quote_table_names} || '';
+    my ($defs, $fks) = create_constraint(@_);
+    
+    # return if there are no constraint definitions so we don't run
+    # into output like this:
+    # ALTER TABLE users ADD ;
+        
+    return unless(@{$defs} || @{$fks});
+    return $index->type eq FOREIGN_KEY ? join(q{}, @{$fks})
+        : join( ' ', 'ALTER TABLE', $qt.$index->table->name.$qt,
+              'ADD', join(q{}, @{$defs}, @{$fks})
+          );
+}
+
+sub drop_table {
+    my ($table, $options) = @_;
+    my $qt = $options->{quote_table_names} || '';
+    return "DROP TABLE $qt$table$qt CASCADE";
+}
+
 1;
 
 # -------------------------------------------------------------------
@@ -518,8 +891,12 @@ sub next_unused_name {
 
 =pod
 
+=head1 SEE ALSO
+
+SQL::Translator, SQL::Translator::Producer::Oracle.
+
 =head1 AUTHOR
 
-Ken Y. Clark E<lt>kclark@cpan.orgE<gt>
+Ken Y. Clark E<lt>kclark@cpan.orgE<gt>.
 
 =cut