+ my($self, $dbh) = ( shift, _dbh(@_) );
+ map { $self->table($_)->sql_create_table($dbh); } $self->tables;
+}
+
+=item sql_update_schema PROTOTYPE_SCHEMA [ DATABASE_HANDLE | DATA_SOURCE [ USERNAME PASSWORD [ ATTR ] ] ]
+
+Returns a list of SQL statements to update this schema so that it is idential
+to the provided prototype schema, also a DBIx::DBSchema object.
+
+ #Optionally, the data source can be specified by passing an open DBI database
+ #handle, or by passing the DBI data source name, username and password.
+ #
+ #If passed a DBI data source (or handle) such as `DBI:mysql:database' or
+ #`DBI:Pg:dbname=database', will use syntax specific to that database engine.
+ #Currently supported databases are MySQL and PostgreSQL.
+ #
+ #If not passed a data source (or handle), or if there is no driver for the
+ #specified database, will attempt to use generic SQL syntax.
+
+Right now this method knows how to add new tables and alter existing tables.
+It doesn't know how to drop tables yet.
+
+See L<DBIx::DBSchema::Table/sql_alter_table>,
+L<DBIx::DBSchema::Column/sql_add_coumn> and
+L<DBIx::DBSchema::Column/sql_alter_column> for additional specifics and
+limitations.
+
+=cut
+
+#gosh, false laziness w/DBSchema::Table::sql_alter_schema
+
+sub sql_update_schema {
+ my($self, $new, $dbh) = ( shift, shift, _dbh(@_) );
+
+ my @r = ();
+
+ foreach my $table ( $new->tables ) {
+
+ if ( $self->table($table) ) {
+
+ warn "$table exists\n" if $DEBUG > 1;
+
+ push @r,
+ $self->table($table)->sql_alter_table( $new->table($table), $dbh );
+
+ } else {
+
+ warn "table $table does not exist.\n" if $DEBUG;
+
+ push @r,
+ $new->table($table)->sql_create_table( $dbh );
+
+ }
+
+ }
+
+ # should eventually drop tables not in $new
+
+ warn join("\n", @r). "\n"
+ if $DEBUG > 1;
+
+ @r;
+
+}
+
+=item update_schema PROTOTYPE_SCHEMA, DATABASE_HANDLE | DATA_SOURCE [ USERNAME PASSWORD [ ATTR ] ]
+
+Same as sql_update_schema, except actually runs the SQL commands to update
+the schema. Throws a fatal error if any statement fails.
+
+=cut
+
+sub update_schema {
+ my($self, $new, $dbh) = ( shift, shift, _dbh(@_) );
+
+ foreach my $statement ( $self->sql_update_schema( $new, $dbh ) ) {
+ $dbh->do( $statement )
+ or die "Error: ". $dbh->errstr. "\n executing: $statement";
+ }
+