Develop Reference

Spring Boot + Testcontainers with remote liquidbase migrations

I have two Spring boot applications that don't know about Liquidbase migrations since migrations are stored in a separate repository and applied by Jenkins.
I want to introduce Testcontainers testing to test communication with DB.
The issue is that I cannot store these migrations locally in the services to avoid duplication.
Is there any way to pull migrations before TestContainer start? Maybe some workaround?

As a workaround, I decided to use JGit SDK to download migrations.
More information about JGit here:
https://www.baeldung.com/jgit

ElasticSearch Schema Migrations

When we write an application, we also write migrations for database schema and data, we use liquibase for that.
For example I am deploying an application locally as developer on my machine, application uses elasticsearch, but before adding some data I need to execute some query/mappings.
So, I want to add that query/mappings to some files, so, when another developer will deploy application on his machine, that query will be executed automatically.
What tools/library are using for migrations ElasticSearch schema?

I created a long time ago a project I'm still maintaining which creates an index with all settings and mappings if it does not exist at startup.
elasticsearch-beyonder is available at https://github.com/dadoonet/elasticsearch-beyonder.
For now, it works only with a TransportClient but I'm planning to add support for the Java REST Client as well.

Oracle to MySQL migration using Spring Boot

Is there any available/aiding tool in java/Spring to do read data from Oracle (old/existing table structure), do some transformation and basically send to Spring-data-REST exposed MySQL database(new table structure).
Basically, want to build a Spring boot application/service which does the same.
P.S.,we have a audit log table in Oracle which we want to use it to drive/sync from Oracle to MySQL.
Does Flyway support this?
Thanks
Bharath

CDI Flyway with multiple database vendor

Flyway provides framework which will execute migrations based on directory
/data/migration
My application supports Oracle, SQLServer or MySQL, i would like to keep scripts as /data/migration/oracle and /data/migration/sqlserver etc...
Application can be deployed either on Oracle, SQLServer or MySQL. How to inform Flyway framework to use specific database deployment migrations using spring integration?

You will pass different location for each database. You may have placeholder for that. I have it done in maven plugin ond only what is needed to be changed is
<locations>
<location>db/${database.type}</location>
</locations>

running "virtual" database in Java code with Hibernate

I used to run my Java code with Hibernate to mysql.
Some logical changes led me to decide that I don't need to save the data in the database, but in java class that will handle it as a database (The data is delete in every startup of the application).
How can I do in Hibernate? is there a way to create an in memory database?

Consider H2 (recommended) or HSQLDB. You can certainly use Hibernate with them. In fact, HSQLDB was the database used by default in Hibernate for their test suite (I think they just changed to H2).

Take a look at Apache Derby.

You could also use SqlLite, which is an in-memory database. I'm just about to start using it with NHibernate for the same purpose in unit tests.

You just need to:
add the driver for the database you want to use and change the hibernate settings for this driver,
change the setting hibernate database dialect,
change the jdbc connection String
(add the jars for the database)
For example for Hypersonic H2 Database:
driverClassName = org.h2.Driver
dialect = org.hibernate.dialect.H2Dialect
connection string = jdbc:h2:mem:test