The class liquibase.Liquibase is designed as a facade to the library for use in integrations. All functionality of Liquibase can be accessed starting with this class, in a simplified manner.
The following code will update your database using Liquibase:
Liquibase liquibase = new Liquibase(changelog, new ClassLoaderResourceAccessor(), DatabaseFactory.getInstance().findCorrectDatabaseImplementation(connection)); liquibase.update();
Some points to notice:
Liquibase uses the concept of a liquibase.resource.ResourceAccessor to abstract how files are accessed. ClassLoaderResourceAccesor is one option which will check your classpath for the specified changelog file and any other resources needed. Other options include FileSystemResourceAccessor which understands absolute paths, and CompositeResourceAccessor which can combine and chain multiple ResourceAccessors. The ResourceAccessor to use is passed to the Liquibase constructor.
The simplest way to get a liquibase.database.Database object, which serves as the database abstraction layer, is by the DatabaseFactory. You can pass a connection to it and receive back the connection wrapped in a Database object.
Update will update the database. Parameters can be passed to update to control contexts and labels, which in turn control which changesets are considered.
Other methods on the Liquibase facade are documented in the Javadocs.