++ed by:
1 non-PAUSE user
Author image Chris Tijerina
and 3 contributors


DBIx::Deployer - Light-weight database patch utility


version v1.2.3


    use DBIx::Deployer;
    my $d = DBIx::Deployer->new(
      target_dsn => 'dbi:Sybase:server=foo;database=bar;',
      target_username => 'sa',
      target_password => '1234',
      patch_path => '../patches/',
      deployer_db_file => 'deployer.db',

    # Run all patches (skipping over those already deployed)

    # Run one patch (and its dependencies)
    my $patches = $d->patches;
    $d->deploy( $patches->{'the patch name'} );


Stop here. Go read about App::Sqitch instead.

Still here? That's probably because your database isn't supported by Sqitch :(. This module is a super-lightweight patch management tool that uses SQLite (see DBD::SQLite) to store whether a patch has been deployed and verified.

If you're wondering why I authored this and did not contribute to Sqitch, the answer is that I needed a quick and dirty solution to hold me over until I can use Sqitch after a database migration.


Semantic versioning is adopted by this module. See http://semver.org/.


target_db (DBI::db)

This is the database handle where patches will be deployed. You may optionally pass target_dsn, target_username, and target_password as an alternative to target_db.

target_dsn (Str)

This is the dsn for your database that you will be performing patch deployments upon. See DBI for more information on dsn strings.

target_username (Str)

The username for your database.

target_password (Str)

The password for your database.

patch_path (Str REQUIRED)

The directory path where you will store your patch files. PLEASE NOTE: DBIx::Deployer will attempt to process *all* files in this directory as patches regardless of extension or naming convention.

deployer_db_file (Str)

This is the file path where you would like your DBIx::Deployer SQLite database to be stored. This is required if using SQLite to manage your patch information.

deployer_db (DBI::db)

If you want your patch status information to live in a database other than SQLite, pass a DBI::db object during instantiation. Your database storing the patches must have a table conforming to the following structure:

  • Table name: patches (you may specify a different table name by using the deployer_patch_table attribute)

  • Column: name VARCHAR (of acceptable length for patch names, recommended to be UNIQUE)

  • Column: deployed BOOL/INT

  • Column: verified BOOL/INT

deployer_patch_table (Str OPTIONAL defaults to 'patches')

Set this attribute if you want patch data to be recorded in a table other than 'patches'. See deployer_db.

supports_transactions (Bool OPTIONAL defaults to true)

If your database supports transactions, deploy_sql will be rolled back if verification fails, or if other errors occur during deployment of individual patches. If your database does not support transactions, you will need to set this attribute to false. Please be aware that without transactions, patches may find themselves in a state of being deployed but not verified... however, if that happens you'll likely have bigger fish to fry like figuring out how to repair your database. :)

keep_newlines (Bool OPTIONAL defaults to false)

For convenience and SQL readability, newlines are allowed in the SQL string values in the JSON patch files contrary to the JSON specification. By default, these newlines will be converted to spaces before being passed to the parser. If for some reason these transformations must not be done, set this attribute to true.



This will process all patches in the patch_path. Some things to note:

  • deploy is idempotent. It will not run patch files that have already been deployed.

  • If your database supports transactions, failed patches will be rolled back. Please be aware that an entire patch file (think multiple SQL statements) will not be rolled back if a patch (think single SQL statement) within the file fails.


This returns an array of DBIx::Deployer::Patch objects. This is only useful if your intent is to use these objects in conjunction with deploy.

deploy (DBIx::Deployer::Patch REQUIRED)

This method deploys the patch passed as an argument AND its corresponding dependencies.


Patches are written as JSON arrays, and stored in the patch_path directory. These files must be able to be parsed by JSON::XS.

    # Patch Example
        "name":"insert into foo",
        "deploy_sql":"INSERT INTO foo VALUES (1, 2)",
        "verify_sql":"SELECT COUNT(*) FROM foo",
        "verify_expects":[ [1] ],
        "dependencies": [ "create table foo" ]
        "name":"create table foo",
        "deploy_sql":"CREATE TABLE foo(a,b)",
        "verify_sql":"PRAGMA table_info(foo)",
        "verify_expects":[ [ 0, "a", "", 0, null, 0 ], [ 1, "b", "", 0, null, 0 ] ]

Patch Attributes

name (Str REQUIRED)

The name of the patch must be unique. It will be used as the primary key for the patch, and is how you will declare it as a dependency for other patches.

dependencies (ArrayRef)

Dependencies are listed by name. Take care not to create circular dependencies as I have no intentions of protecting against them.

deploy_sql (Str)

Patch files may contain multiple patches, but a single patch within a patch file may not contain more than one SQL statement to deploy.

deploy_sql_args (ArrayRef)

If using bind parameters in your deploy_sql statement, the values in deploy_sql_args will be used for those parameters. See DBI and http://www.bobby-tables.com for more information about bind parameters.

deploy_script (Str) *EXPERIMENTAL*

The deploy_script will be passed as an argument to the system command. Scripts are expected to handle transactions on their own. A non-zero exit status is reported as a failure.

deploy_script_args (ArrayRef) *EXPERIMENTAL*

The deploy_script_args are passed to the system command with the deploy_script in PROGRAM LIST syntax. It may be useful to manipulate this attribute at runtime to pass environment-specific arguments.

verify_sql (Str)

This is a single query used to sanity check that your deploy_sql was successful. By default, this parameter is required. See no_verify if your use case requires deployment without verification.

verify_sql_args (ArrayRef)

If using bind parameters in your verify_sql statement, the values in verify_sql_args will be used for those parameters. See DBI and http://www.bobby-tables.com for more information about bind parameters.

verify_expects (ArrayRef)

The verify_sql is selected using selectall_arrayref (see DBI). The verify_expects attribute is a representation of the query result you would anticipate from the selectall_arrayref method.

no_verify (Bool)

If set to true, patches will be marked verified WITHOUT having any tests run.





  • eMortgage Logic, LLC., for allowing me to publish this module to CPAN


Chris Tijerina


This software is copyright (c) 2014-2017 by eMortgage Logic LLC.

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