May 17 2009

Using DBIx::Class to Version Your Schema

Category: Databases,Deployment,Schema Versioningjgoulah @ 5:53 PM

Intro to DBIx::Class

In my opinion DBIx::Class is one of the best ORM solutions out there. Not only can it model your database, including mapping out any foreign key relationships, it can also be used as a canonical point of reference for your schema.   This means we can use it not only as an application layer interface to the database, but can also define a versioned database structure using the code,  where if you add a field into your result class,  you can generate a version of alter statements and a DDL just by running a simple script.   Of course this set of alterations can later be applied to your stage and production environments.

It’s possible to produce your schema classes with DBIx::Class::Schema::Loader if you have a pre-existing database and are initially generating your DBIC classes, but this article is going to show going from the ground up how to build your database from the code defining the fields and tables as well as the relations, which match to foreign key constraints when the database definition files are generated.

Creating your Schema

This example will be a pretty simple schema but enough to demonstrate generating a couple of tables with a foreign key constraint. Since a lot of people are doing social networking stuff these days we can assume a common use case would be a user who has a bunch of photos. So we’ll need to model a user table and a photo table, but first things first, lets create a few basic things, assuming we’ll call our application MySocialApp

mkdir -p MySocialApp/lib/MySocialApp/Schema/Result
cd MySocialApp

We need to create a schema file at lib/MySocialApp/Schema.pm that inherits from the base DBIx::Class::Schema

package MySocialApp::Schema;
use base qw/DBIx::Class::Schema/;

use strict;
use warnings;
our $VERSION = '0.00001';

__PACKAGE__->load_namespaces();

__PACKAGE__->load_components(qw/Schema::Versioned/);

__PACKAGE__->upgrade_directory('sql/');

1;

So here all we are doing is extending the base Schema and loading the Versioned component. We’re setting the directory where DDL and Diff files will be generated into the sql directory. We’re also invoking load_namespaces which tells it to look at the MySocialApp::Schema::Result namespace for our result classes by default.

Creating the Result Classes

Here I will define what the database is going to look like

package MySocialApp::Schema::Result::User;

use Moose;
use namespace::clean -except => 'meta';

extends 'DBIx::Class';

 __PACKAGE__->load_components(qw/Core/);
 __PACKAGE__->table('user');

 __PACKAGE__->add_columns(

    user_id => {
        data_type   => "INT",
        size        => 11,
        is_nullable => 0,
        is_auto_increment => 1,
        extra => { unsigned => 1 },
    },
    username => {
        data_type => "VARCHAR",
        is_nullable => 0,
        size => 255,
    },
);

__PACKAGE__->set_primary_key('user_id');

__PACKAGE__->has_many(
    'photos',
    'MySocialApp::Schema::Result::Photo',
    { "foreign.fk_user_id" => "self.user_id" },
);

1;

This is relatively straightforward. I’m creating a user table that has an auto incrementing primary key and a username field. I’m also defining a relationship that says a user can have many photos. Lets create the photo class.

package MySocialApp::Schema::Result::Photo;

use Moose;
use namespace::clean -except => 'meta';

extends 'DBIx::Class';

 __PACKAGE__->load_components(qw/Core/);
 __PACKAGE__->table('photo');

 __PACKAGE__->add_columns(

    photo_id => {
        data_type   => "INT",
        size        => 11,
        is_nullable => 0,
        is_auto_increment => 1,
        extra => { unsigned => 1 },
    },
    url => {
        data_type => "VARCHAR",
        is_nullable => 0,
        size => 255,
    },
    fk_user_id => {
        data_type   => "INT",
        size        => 11,
        is_nullable => 0,
        extra => { unsigned => 1 },
    },
);

__PACKAGE__->set_primary_key('photo_id');

 __PACKAGE__->belongs_to(
    'user',
    'MySocialApp::Schema::Result::User',
    { 'foreign.user_id' => 'self.fk_user_id' },
);


1;

Same basic thing here, a photo class with a photo_id primary key, a url field, and an fk_user_id field that keys into the user table. Each photo belongs to a user, and this relationship will define our foreign key constraint when the schema is generated.

Versioning the Database

Create the Versioning Scripts

We have the main DBIx::Class pieces in place to generate the database, but we’ll need a couple of scripts to support our versioned database. One script will generate the schema based on the version before it, introspecting which alterations have been made and producing a SQL diff file to alter the database. The other script will look at the database to see if it needs upgrading, and run the appropriate diff files to bring it up to the current version.

First the schema and diff generation script which we’ll call script/gen_schema.pl

use strict;

use FindBin;
use lib "$FindBin::Bin/../lib";

use Pod::Usage;
use Getopt::Long;
use MySocialApp::Schema;

my ( $preversion, $help );
GetOptions(
        'p|preversion:s'  => \$preversion,
        ) or die pod2usage;

my $schema = MySocialApp::Schema->connect(
        'dbi:mysql:dbname=mysocialapp;host=localhost', 'mysocialapp', 'mysocialapp4u'
        );
my $version = $schema->schema_version();

if ($version && $preversion) {
    print "creating diff between version $version and $preversion\n";
} elsif ($version && !$preversion) {
    print "creating full dump for version $version\n";
} elsif (!$version) {
    print "creating unversioned full dump\n";
}

my $sql_dir = './sql';
$schema->create_ddl_dir( 'MySQL', $version, $sql_dir, $preversion );

This script will be run anytime we change something in the Result files. You give it the previous schema version, and it will create a diff between that and the new version. Before running this you’ll update the $VERSION variable in lib/MySocialApp/Schema.pm so that it knows a change has been made.

The next script is the upgrade script, we’ll call it script/upgrade_db.pl

use strict;

use FindBin;
use lib "$FindBin::Bin/../lib";

use MySocialApp::Schema;

my $schema = MySocialApp::Schema->connect(
        'dbi:mysql:dbname=mysocialapp;host=localhost', 'mysocialapp', 'mysocialapp4u'
        );

if (!$schema->get_db_version()) {
    # schema is unversioned
    $schema->deploy();
} else {
    $schema->upgrade();
}

This script checks to see if any diffs need to be applied, and applies them if the version held by the database and the version in your Schema.pm file differ, bringing the database up to the correct schema version.

Note, in these scripts I’ve hardcoded the DB info which really should go into a configuration file.

Create a Database to Deploy Into

We need to create the database that our tables will be created in. In the connect calls above we’re using this user and password to connect to our database. I’m using MySQL for the example so this would be done on the MySQL command prompt

mysql> create database mysocialapp;
Query OK, 1 row affected (0.00 sec)

mysql> grant all on mysocialapp.* to mysocialapp@'localhost' identified by 'mysocialapp4u';
Query OK, 0 rows affected (0.01 sec)

Deploy the Initial Schema

Now its time to deploy our initial schema into MySQL. But for the first go round we also have to create the initial DDL file, this way when we make changes in the future it can be compared against the Schema result classes to see what changes have been made. We can do this by supplying a nonexistent previous version to our gen_schema.pl script

$ perl script/gen_schema.pl -p 0.00000
Your DB is currently unversioned. Please call upgrade on your schema to sync the DB.
creating diff between version 0.00001 and 0.00000
No previous schema file found (sql/MySocialApp-Schema-0.00000-MySQL.sql) at /home/jgoulah/perl5/lib/perl5/DBIx/Class/Storage/DBI.pm line 1685.

And we can see the DDL file now exists

$ ls sql/
MySocialApp-Schema-0.00001-MySQL.sql

Then we need to deploy to MySQL for the first time so we run the upgrade script

$ perl script/upgrade_db.pl
Your DB is currently unversioned. Please call upgrade on your schema to sync the DB.

Now check out what its created in MySQL

mysql> use mysocialapp;
Database changed
mysql> show tables;
+----------------------------+
| Tables_in_mysocialapp      |
+----------------------------+
| dbix_class_schema_versions |
| photo                      |
| user                       |
+----------------------------+
3 rows in set (0.00 sec)

There is our photo table, our user table, and also a dbix_class_schema_versions table. This last table just keeps track of what version the database is. You can see we are in sync with the Schema class by selecting from that table and also when this version was installed.

mysql> select * from dbix_class_schema_versions;
+---------+---------------------+
| version | installed           |
+---------+---------------------+
| 0.00001 | 2009-05-17 21:59:57 |
+---------+---------------------+
1 row in set (0.00 sec)

The really great thing is that we have created the tables -and- constraints based on our schema result classes. Check out our photo table

mysql> show create table photo\G
*************************** 1. row ***************************
       Table: photo
Create Table: CREATE TABLE `photo` (
  `photo_id` int(11) unsigned NOT NULL auto_increment,
  `url` varchar(255) NOT NULL,
  `fk_user_id` int(11) unsigned NOT NULL,
  PRIMARY KEY  (`photo_id`),
  KEY `photo_idx_fk_user_id` (`fk_user_id`),
  CONSTRAINT `photo_fk_fk_user_id` FOREIGN KEY (`fk_user_id`) REFERENCES `user` (`user_id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=latin1
1 row in set (0.00 sec)

Making Database Changes

Lets say we want to add a password field to our user table. I’d open up the lib/MySocialApp/Schema/Result/User.pm file and add a section for my password field to the add_columns definition so now it looks like:

 __PACKAGE__->add_columns(

    user_id => {
        data_type   => "INT",
        size        => 11,
        is_nullable => 0,
        is_auto_increment => 1,
        extra => { unsigned => 1 },
    },
    username => {
        data_type => "VARCHAR",
        is_nullable => 0,
        size => 255,
    },
    password => {
        data_type => "VARCHAR",
        is_nullable => 0,
        size => 255,
    },
);

Then we update the lib/MySocialApp/Schema.pm file and update to the next version so it looks like

our $VERSION = '0.00002';

To create the DDL and Diff for this version we run the gen_schema script with the previous version as the argument

$ perl script/gen_schema.pl -p 0.00001
Versions out of sync. This is 0.00002, your database contains version 0.00001, please call upgrade on your Schema.
creating diff between version 0.00002 and 0.00001

If you look in the sql directory there are two new files. The DDL is named MySocialApp-Schema-0.00002-MySQL.sql and the diff is called MySocialApp-Schema-0.00001-0.00002-MySQL.sql and has the alter statement

$ cat sql/MySocialApp-Schema-0.00001-0.00002-MySQL.sql
-- Convert schema 'sql/MySocialApp-Schema-0.00001-MySQL.sql' to 'MySocialApp::Schema v0.00002':;

BEGIN;

ALTER TABLE user ADD COLUMN password VARCHAR(255) NOT NULL;

COMMIT;

Now we can apply that with our upgrade script

$ perl script/upgrade_db.pl
Versions out of sync. This is 0.00002, your database contains version 0.00001, please call upgrade on your Schema.

DB version (0.00001) is lower than the schema version (0.00002). Attempting upgrade.

and see that the upgrade has been made in MySQL

mysql> describe user;
+----------+------------------+------+-----+---------+----------------+
| Field    | Type             | Null | Key | Default | Extra          |
+----------+------------------+------+-----+---------+----------------+
| user_id  | int(11) unsigned | NO   | PRI | NULL    | auto_increment |
| username | varchar(255)     | NO   |     |         |                |
| password | varchar(255)     | NO   |     |         |                |
+----------+------------------+------+-----+---------+----------------+
3 rows in set (0.00 sec)

Conclusion

So now we’ve seen a really easy way that we can maintain our database schema from our ORM code. We have a versioned database that is under revision control, and can keep our stage and production environments in sync with our development code. With this type of setup its also easy to maintain branches with different database changes and merge them into the mainline, and it also ensures that the database you are developing on is always in sync with the code.

Tags: , , ,


Jan 13 2009

Using SQLT to Create Database Diffs

Category: Schema Versioningjgoulah @ 11:19 PM

Overview

Database diffs can be useful for a variety of use cases, from outputting the differences in your development versus production schema to full blown database versioning systems.   A database diff is similar in nature to a file diff, but instead of outputting the differences between two files,  it will output the set of alterations to be made to bring one databases schema in sync with another.   There are a variety of tools that will accomplish this for you, but I am going to use a tool called SQL::Translator.   SQLT can do quite a lot for you, such as converting among different schema dialects (think MySQL to Oracle) or outputting an ERD of your database, but I’ll stick with using it as a simple diff tool for this article.

Installation

The tool can be found here on CPAN.   I suggest using local::lib for perl module installation to avoid needing to install things as root.  I’ve written up detailed instructions in the past, but its pretty straightforward if you follow the bootstrap instructions.  In any case, if you are lucky you will be able to just do a normal cpan install like so:

cpan SQL::Translator

For our examples you’ll also need the DBD::MySQL driver. This can be a real pain to install from CPAN so you may want to try to use your systems package management for this. Under Debian this is called libdbd-mysql-perl and in Redhat its called perl-DBD-MySQL.

Diffing Two DDL Files

Once you have SQLT installed, you’ll want to grab the DDL files from the databases that you are interested in producing diffs for.  If you are using mysql this is easy enough to do with mysqldump.

So lets say you want to compare your development and production databases, we’d grab those schema dumps, assuming your dev db is on host ‘dev’ and prod db on host ‘prod’:

mysqldump --no-data -h dev -u your_dbuser -p your_dbname > dev_db.sql
mysqldump --no-data -h prod -u your_dbuser -p your_dbname > prod_db.sql

The SQLT install comes with a handy script called sqlt-diff which you can use to diff two different DDL files. So in the case of MySQL all you have to run is:

sqlt-diff dev_db.sql=MySQL prod_db.sql=MySQL > my_diff.sql

You should be able to pass other arguments where we’ve used ‘MySQL’ here, and you can get a list via:

sqlt -l

Diffing DDL Against a Database

The above may be all you need, but perhaps you want to diff a DDL against the actual database for whatever reason. I recently used this approach to write a versioning system in which the database changes could be output into a file containing the alterations as well as a new DDL for each “version”, this way changes are not lost or forgotten.

SQLT doesn’t currently have any scripts to handle this (yet) so we’ll have to use the perl module itself to do what we want. A simple perl script is all we need.

#!/usr/bin/perl

use strict;
use warnings;
use SQL::Translator;
use SQL::Translator::Diff;
use DBI;

# set the path of the file you want to diff against the DB
$ddl_file = "/path/to/file_to_diff.sql";

# make sure to fill in db_name, host_name, and db_port
my $dsn = "DBI:mysql:database=db_name;host=host_name;port=db_port";

# you'll have to set the db_user and db_pass here
DBI->connect($dsn, 'db_user', 'db_pass', {'RaiseError' => 1});

# create a SQLT object that connect to the database via our dbh
my $db_tr = SQL::Translator->new({
      add_drop_table => 1,
      parser => 'DBI',
      parser_args => {  dbh => $dbh }
    });
$db_tr->parser('SQL::Translator::Parser::DBI::MySQL');


$db_tr->parse($db_tr, $dbh);

# create a SQLT object that corresponds to our ddl file
my $file_tr = SQL::Translator->new({
    parser => 'MySQL'
  });
my $out = $file_tr->translate( $ddl_file ) or die $file_tr->error;

# perform the actual diff (some of the options you use may vary)
my $diff = SQL::Translator::Diff::schema_diff(
    $file_tr->schema,  'MySQL',
    $db_tr->schema,  'MySQL',
    {
    ignore_constraint_names => 1,
    ignore_index_names => 1,
    caseopt => 1
    }
);

# now just print out the diff
my $file;
my $filename = "diff_output.sql"
if(!open($file, ">$filename")) {
  die("Can't open $filename for writing ($!)");
  next;
}
print $file $diff;

So we’ve used the SQL Translator tool to read in our database, read in our DDL, and produce a diff. Pretty neat!

Conclusion

We’ve really only scratched the surface with some of the capabilities of SQL::Translator, but its a pretty handy thing to be able to easily diff various schemas. Its important that your development and production schema are in sync, and stay in sync, and this gives an easy way to start on automating that process.

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