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Fix and Retest


The functionality you tested for milestone 1 relies on:

  • Create and populate the databasechangeloglock table
  • Create and populate the databasechangelog table
  • Execute user-specified SQL

Improving Your Database Support

The standard liquibase.changelog.ChangeLogHistoryService, liquibase.lockservice.LockService, and liquibase.executor.Executor implementations rely on SQL and/or JDBC standards guided by dialect information from your Database class.

If you run into any problems with those standard services, the most likely fix is to override additional liquibase.database.Database methods to more correctly describe how your database works.

For example, if the databasechangeloglock table isn't being created correctly because your database quotes object names in a special way, override the escapeObjectName function.

The full list of methods you can override can be found in liquibase.database.Database API.


Exactly what you need to override will depend on the actual problems you hit. If you have questions on what it takes to fix your problem, ask on the forum or contact the Liquibase team.

Advanced Fixes

If your database deviates significantly from what the standard services expect, your changes may not be isolated to your new Database class.

Instead, you may need to override one or more of the following SQLGenerators:

  • liquibase.sqlgenerator.core.ClearDatabaseChangeLogTableGenerator
  • liquibase.sqlgenerator.core.CreateDatabaseChangeLogLockTableGenerator
  • liquibase.sqlgenerator.core.CreateDatabaseChangeLogTableGenerator
  • liquibase.sqlgenerator.core.InitializeDatabaseChangeLogLockTableGenerator
  • liquibase.sqlgenerator.core.MarkChangeSetRanGenerator


After you make a potential fix to the problem you found, re-run your test and see if Liquibase is working better.

  • Sometimes your fix didn't work as well as you hoped. Try a new one
  • Sometimes your fix resolved one issue, but now you have hit another. Fix that up
  • Eventually, you will be done. Congratulations!!

Next Steps

With Liquibase working for your database, now is a great time to release the first version of your extension and get feedback.

When you are ready to build advanced support, you can start working on milestone 2