Liquibase on Micha Kops' Tech Notes

Java EE 7 Database Migrations with Liquibase and WildFly

Thu, 31 Jul 2014 00:00:00 +0200

I have written about other database migration frameworks before but in this article I’d like to cover the Liquibase framework in combination with WildFly as Java EE 7 compatible application server.

In the following tutorial, we’re going to write a full Java EE 7 book store application with a few steps and with Liquibase on board to create the database structure and insert example data into the database.

Thanks to the WildFly Maven Plug-in we even do not need to download and configure the application server but let Maven and the plug-in do the work for us.

Liquibase Snippets

Mon, 01 Mar 2010 00:00:00 +0100

Precondition: Postgres Schema exists

Using this precondition should run a migration only if the schema my_schema exists.

<preConditions onFail="CONTINUE">
    <sqlCheck expectedResult="1">
        SELECT COUNT(1) FROM information_schema.schemata WHERE schema_name = 'my_schema';
    </sqlCheck>
</preConditions>

Resources:

https://docs.liquibase.com/concepts/changelogs/preconditions.html