NAME
   GraphViz::DBI - Graph database tables and relations

VERSION
   version 1.100860

SYNOPSIS
     use GraphViz::DBI;
     my $dbh = DBI->connect('...', '...', '...');
     print GraphViz::DBI->new($dbh)->graph_tables->as_png;

DESCRIPTION
   This module constructs a graph for a database showing tables and
   connecting them if they are related. While or after constructing the
   object, pass an open database handle, then call "graph_tables" to
   determine database metadata and construct a GraphViz graph from the
   table and field information.

   The methods described here are defined by this class; all other method
   calls are passed to the underlying GraphViz object:

METHODS
 new([$dbh])
   Constructs the object; also creates a GraphViz object. The constructor
   accepts an optional open database handle.

 set_dbh($dbh)
   Sets the database handle.

 get_dbh()
   Returns the database handle.

 get_tables()
   Returns the tables defined in the database.

 is_table($table)
   Checks the database metadata whether the argument is a valid table name.

 is_foreign_key($table, $field)
   Determines whether the field belonging to the table is a foreign key
   into some other table. If so, it is expected to return the name of that
   table. If not, it is expected to return a false value.

   For example, if there is a table called "product" and another table
   contains a field called "product_id", then to indicate that this field
   is a foreign key into the product table, the method returns "product".
   This is the logic implemented in this class. You can override this
   method in a subclass to suit your needs.

 graph_tables()
   This method goes through all tables and fields and calls appropriate
   methods to determine which tables and which dependencies exist, then
   hand the results over to GraphViz. It returns the GraphViz object.

FEATURE IDEAS
   *   Test with various database drivers to see whether they support the
       metadata interface.

   *   Make each table a vertical port with dependencies using those ports.

   *   Provide the possibility to name edges to specify the type of
       relationship ('has-a', 'is-a', etc.).

INSTALLATION
   See perlmodinstall for information and options on installing Perl
   modules.

BUGS AND LIMITATIONS
   No bugs have been reported.

   Please report any bugs or feature requests through the web interface at
   <http://rt.cpan.org/Public/Dist/Display.html?Name=GraphViz-DBI>.

AVAILABILITY
   The latest version of this module is available from the Comprehensive
   Perl Archive Network (CPAN). Visit <http://www.perl.com/CPAN/> to find a
   CPAN site near you, or see <http://search.cpan.org/dist/GraphViz-DBI/>.

   The development version lives at
   <http://github.com/hanekomu/GraphViz-DBI/>. Instead of sending patches,
   please fork this project using the standard git and github
   infrastructure.

AUTHOR
     Marcel Gruenauer <[email protected]>

COPYRIGHT AND LICENSE
   This software is copyright (c) 2001 by Marcel Gruenauer.

   This is free software; you can redistribute it and/or modify it under
   the same terms as the Perl 5 programming language system itself.

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