Alex Vandiver > Jifty-DBI-0.77 > Jifty::DBI::SchemaGenerator

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Module Version: 0.01   Source  

NAME ^

Jifty::DBI::SchemaGenerator - Generate a table schema from Jifty::DBI records

DESCRIPTION ^

This module turns a Jifty::Record object into an SQL schema for your chosen database. At the moment, your choices are MySQL, SQLite, or PostgreSQL. Oracle might also work right, though it's untested.

SYNOPSIS ^

The Short Answer

See below for where we get the $handle and $model variables.

  use Jifty::DBI::SchemaGenerator;
  ...
  my $s_gen = Jifty::DBI::SchemaGenerator->new( $handle );
  $s_gen->add_model($model);

  my @statements = $s_gen->create_table_sql_statements;
  print join("\n", @statements, '');
  ...

The Long Version

See Jifty::DBI for details about the first two parts.

MyModel
  package MyModel; 
  # lib/MyModel.pm

  use warnings;
  use strict;

  use base qw(Jifty::DBI::Record);
  # your custom code goes here.
  1;
MyModel::Schema
  package MyModel::Schema;
  # lib/MyModel/Schema.pm

  use warnings;
  use strict;

  use Jifty::DBI::Schema;

  column foo => type is 'text';
  column bar => type is 'text';

  1;
myscript.pl
  #!/usr/bin/env perl
  # myscript.pl

  use strict;
  use warnings;

  use Jifty::DBI::SchemaGenerator;

  use Jifty::DBI::Handle;
  use MyModel;
  use MyModel::Schema;

  my $handle = Jifty::DBI::Handle->new();
  $handle->connect(
    driver   => 'SQLite',
    database => 'testdb',
  );

  my $model = MyModel->new($handle);
  my $s_gen = Jifty::DBI::SchemaGenerator->new( $handle );
  $s_gen->add_model($model);

  # here's the basic point of this module:
  my @statements = $s_gen->create_table_sql_statements;
  print join("\n", @statements, '');

  # this part is directly from Jifty::Script::Schema::create_all_tables()
  $handle->begin_transaction;
  for my $statement (@statements) {
    my $ret = $handle->simple_query($statement);
    $ret or die "error creating a table: " . $ret->error_message;
  }
  $handle->commit;

CONFIGURATION AND ENVIRONMENT ^

Requires no configuration files or environment variables.

DEPENDENCIES ^

Class::Accessor::Fast

DBIx::DBSchema

Class::ReturnValue

METHODS ^

new HANDLE

Creates a new Jifty::DBI::SchemaGenerator object. The single required argument is a Jifty::DBI::Handle.

add_model MODEL

Adds a new model class to the SchemaGenerator. Model should be an object which is an instance of Jifty::DBI::Record or a subclass thereof. It may also be a string which is the name of such a class/subclass; in the latter case, add_model will instantiate an object of the class.

The model must define the instance methods schema and table.

Returns true if the model was added successfully; returns a false Class::ReturnValue error otherwise.

column_definition_sql TABLENAME COLUMNNAME

Given a table name and a column name, returns the SQL fragment describing that column for the current database.

create_table_sql_statements

Returns a list of SQL statements (as strings) to create tables for all of the models added to the SchemaGenerator.

create_table_sql_text

Returns a string containing a sequence of SQL statements to create tables for all of the models added to the SchemaGenerator.

This is just a trivial wrapper around "create_table_sql_statements".

PRIVATE _db_schema_table_from_model MODEL

Takes an object of a subclass of Jifty::DBI::Record; returns a new DBIx::DBSchema::Table object corresponding to the model.

PRIVATE _error STRING

Takes in a string and returns it as a Class::ReturnValue error object.

INCOMPATIBILITIES ^

None reported.

BUGS AND LIMITATIONS ^

No bugs have been reported.

Please report any bugs or feature requests to bug-<RT NAME>@rt.cpan.org, or through the web interface at http://rt.cpan.org.

AUTHOR ^

David Glasser glasser@bestpractical.com

Some pod by Eric Wilhelm <ewilhelm at cpan dot org>

LICENCE AND COPYRIGHT ^

Copyright (c) 2005, Best Practical Solutions, LLC. All rights reserved.

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic.

DISCLAIMER OF WARRANTY ^

BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH YOU. SHOULD THE SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR, OR CORRECTION.

IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENCE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

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