#NAME

SQL::Translator::Producer::TTSchema - Produces output using the Template Toolkit from a SQL schema

#SYNOPSIS

use SQL::Translator;
my $translator     = SQL::Translator->new(
    from           => 'MySQL',
    filename       => 'foo_schema.sql',
    to             => 'TTSchema',
    producer_args  => {
        ttfile     => 'foo_template.tt',  # Template file to use

        # Extra template variables
        tt_vars     => {
            author => "Mr Foo",
        },

        # Template config options
        tt_conf     => {
            INCLUDE_PATH => '/foo/templates',
        },
    },
);
print $translator->translate;

#DESCRIPTION

Produces schema output using a given Template Tookit template.

It needs one additional producer arg of ttfile which is the file name of the template to use. This template will be passed a variable called schema, which is the SQL::Translator::Producer::Schema object created by the parser. You can then use it to walk the schema via the methods documented in that module.

Here's a brief example of what the template could look like:

database: [% schema.database %]
tables:
[% FOREACH table = schema.get_tables %]
    [% table.name %]
    ================
    [% FOREACH field = table.get_fields %]
        [% field.name %]   [% field.data_type %]([% field.size %])
    [% END -%]
[% END %]

See t/data/template/basic.tt for a more complete example.

The template will also get the set of extra variables given as a hashref via the tt_vars producer arg. (Note that the old style of passing this config in the ttargs producer arg has been deprecated).

You can set any of the options used to initialize the Template object by adding a tt_conf producer arg. See Template Toolkit docs for details of the options. (Note that the old style of passing this config directly in the ttargs producer args has been deprecated).

$translator          = SQL::Translator->new(
    to               => 'TT',
    producer_args    => {
        ttfile       => 'foo_template.tt',
        tt_vars      => {},
        tt_conf      => {
          INCLUDE_PATH => '/foo/templates/tt',
          INTERPOLATE  => 1,
        }
    },
);

You can use this producer to create any type of text output you like, even using it to create your own versions of what the other producers make. For example, you could create a template that translates the schema into MySQL's syntax, your own HTML documentation, your own Class::DBI classes (or some other code) -- the opportunities are limitless!

#Producer Args

#ttfile: The template file to generate the output with.
#tt_vars: A hash ref of extra variables you want to add to the template.
#tt_conf: A hash ref of configuration options to pass to the Template object's constructor.

#AUTHOR

Mark Addison <grommit@users.sourceforge.net>.

#TODO

More template vars? e.g. [% tables %] as a shortcut for [% schema.get_tables %].

#SEE ALSO

SQL::Translator.