update-count

The update-count command sequentially updates a specified number of changesets on your database.

Uses

The update-count command is mainly used when you want to apply changes and update changesets sequentially, starting with the changesets from the top of the changelog file until the number specified is reached.

The image below shows four changesets: changeset a, changeset b, changeset c, and changeset d. As you can see, changeset a is already deployed on the database. So, running the command update-count 2, deploys changeset b and c without applying changeset d.

Additionally, the best practice is to run the update-count-sql helper command because it allows you to inspect the update-count SQL, so you can correct any issues that may arise before running the command.

Running the update-count command

To run the update-count command, specify the driver, classpath, and URL in the Liquibase properties file. For more information, see Specifying Properties in a Connection Profile. You can also specify them from the command line.

Then run the update-count command:

liquibase --changelog-file=myChangelog.xml update-count 2

Note: Enter the name of the changelog and number you want to use in place of myChangelog.xml and 2.

update-count global attributes

Attribute	Definition	Requirement
--changelog-file *	The root changelog	Required
--url	The JDBC database connection URL	Required
--username	The database username	Required
--password	The database password	Required

* Liquibase will check nested changelogs for definitions of the changesets to update.

Note: The username and password attributes are not required for connections and systems which use alternate means of authentication.

update-count command attributes

Attribute	Definition	Requirement
<value>	The integer indicating the number of changes you want to update	Required