tagExists <tag string> command

The tagExists <tag string> command checks whether the tag you specify already exists in your database.

Uses

The tagExists <tag string> command is typically used to identify whether the specified tag exists in the database or specifically in the DATABASECHANGELOG table. Running the tagExists <tag string> command checks for the tag and, based on whether it exists or not, provides the appropriate output.

Running the tagExists <tag string> command

To run the tagExists <tag string> command, you can specify the driver, classpath, and URL in your liquibase.properties file. For more information, see Creating and configuring a liquibase.properties file. You can also specify these properties in your command line.

Then run the tagExists <tag string> command:

liquibase --changeLogFile=communityOnly.xml tagExists myTag

Note: Enter the name of the changelog and the tag that you want to use in place of communityOnly.xml and myTag.

tagExists <tag string> global attributes

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

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

tagExists <tag string> command attributes

Attribute	Definition	Requirement
<tag>	The tag you can add to changesets to determine which changesets in the changelog to evaluate based on their tags.	Required