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.
General Usage
The following code will update your database using LiquiBase:
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Liquibase liquibase = new Liquibase(changelog, new ClassLoaderResourceAccessor(), DatabaseFactory.getInstance().findCorrectDatabaseImplementation(connection)); liquibase.update(); |
Some points to notice:
ClassLoaderResourceAccessor
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 ResourceAccessor. The ResourceAccessor to use is passed to the LiquiBase constructor.
DatabaseFactory.getInstance().findCorrectDatabaseImplementation
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()
Update will update the database. Parameters can be passed to update to control contextsto execute.