Sqitch is a database change management application. It currently supports PostgreSQL 8.4+, SQLite 3.7.11+, MySQL 5.0+, Oracle 10g+, Firebird 2.0+, Vertica 6.0+, Exasol 6.0+ and Snowflake.
What makes it different from your typical migration approaches? A few things:
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No opinions
Sqitch is not tied to any framework, ORM, or platform. Rather, it is a standalone change management system with no opinions about your database engine, application framework, or development environment.
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Native scripting
Changes are implemented as scripts native to your selected database engine. Writing a PostgreSQL application? Write SQL scripts for
psql. Writing an Oracle-backed app? Write SQL scripts for SQL*Plus. -
Dependency resolution
Database changes may declare dependencies on other changes -- even on changes from other Sqitch projects. This ensures proper order of execution, even when you've committed changes to your VCS out-of-order.
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Deployment integrity
Sqitch manages changes and dependencies via a plan file, and employs a Merkle tree pattern similar to Git and Blockchain to ensure deployment integrity. As such, there is no need to number your changes, although you can if you want. Sqitch doesn't much care how you name your changes.
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Iterative Development
Up until you tag and release your project, you can modify your change deployment scripts as often as you like. They're not locked in just because they've been committed to your VCS. This allows you to take an iterative approach to developing your database schema. Or, better, you can do test-driven database development.
Want to learn more? The best place to start is in the tutorials:
- Introduction to Sqitch on PostgreSQL
- Introduction to Sqitch on SQLite
- Introduction to Sqitch on Oracle
- Introduction to Sqitch on MySQL
- Introduction to Sqitch on Firebird
- Introduction to Sqitch on Vertica
- Introduction to Sqitch on Exasol
- Introduction to Sqitch on Snowflake
There have also been a number of presentations on Sqitch:
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PDX.pm Presentation: Slides from "Sane Database Management with Sqitch", presented to the Portland Perl Mongers in January, 2013.
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PDXPUG Presentation: Movie of "Sane Database Management with Sqitch", presented to the Portland PostgreSQL Users Group in September, 2012.
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Agile Database Development: Slides from a three-hour tutorial session on using Git, test-driven development with pgTAP, and change management with Sqitch, updated in January, 2014.
To install Sqitch from a distribution download, type the following:
perl Build.PL
./Build installdeps
./Build
./Build test
./Build install
To install Sqitch and all of its dependencies into a single directory named
sqitch_bundle, install the Menlo CPAN client and build the bundle:
cpanm Menlo::CLI::Compat
./Build bundle --install_base sqitch_bundle
After which, Sqitch can be run from ./sqitch_bundle/bin/sqitch. By default,
no modules that are included in the core Perl distrituion are included. To
require that dual-life modules also be bundled, pass --dual_life 1:
./Build bundle --install_base sqitch_bundle --dual_life 1
To include support for a feature in the bundle, pass the --with option
naming the feature:
./Build bundle --install_base sqitch_bundle --with postgres --with sqlite
The feature names generally correspond to the supported engines. The currently supported features are:
--with postgres: Support for managing PostgreSQL databases--with sqlite: Support for managing SQLite databases--with mysql: Support for managing MySQL databases--with firebird: Support for managing Firebird databases--with oracle: Support for managing Oracle databases--with vertica: Support for managing Vertica databases--with exasol: Support for managing Exasol databases--with snowflake: Support for managing Snowflake databases--with odbc: Include the ODBC driver
To build from a Git clone, first install Dist::Zilla, then use it to install Sqitch and all dependencies:
cpanm Dist::Zilla
dzil authordeps --missing | cpanm
dzil listdeps --missing | cpanm
dzil install
To run Sqitch directly from the Git clone, execute t/sqitch.
To install Sqitch on a specific platform, including Debian- and RedHat-derived Linux distributions and Windows, see the Installation documentation.
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