Setting up multiple database with Flyway

Question

I am trying to setup two different database with Flyway 5.0.7, MySQL for development and H2 for testing. I have configured both databases in respective files.

For Development, src/main/resource/application.properties

spring.datasource.url=jdbc:mysql://localhost:3306/moment
spring.datasource.username=root
spring.datasource.password=root

flyway.locations=db/migration,db/specific/mysql

For Testing, src/test/resource/application.properties

spring.datasource.driver-class-name=org.h2.Driver
spring.datasource.url=jdbc:h2:mem:db;DB_CLOSE_DELAY=-1
spring.datasource.username=sa
spring.datasource.password=sa

flyway.locations=db/migration,db/specific/h2

Below is the folder structure for Flyway migration files

In this case Flyway is not able to find migration files under specific folder and throws error when applying V1.1__Insert_Records.sql for table not found.

If I move the specific folder inside db/migration, I am getting error for duplicate files of same version.

Any suggestions how should I configure migration files for multiple databases to work with Flyway?

Answer 1

I suspect you might be using Spring Boot 2.x here? If so, flyway.locations is no longer valid and will be ignored.

Flyway will then just use the default location (db/migration), which will find only the V1.1__Insert_Records.sql script but not the V1__Create_table.sql script.

With Spring Boot 2.x, flyway.locations must be prefixed with spring.:

spring.flyway.locations=db/migration,db/specific/h2

By the way, if you use the {vendor} placeholder in the location, Spring Boot will work out the directory from the lowercase of the database driver id (h2, mysql, oracle, etc), which is nice:

spring.flyway.locations=db/migration,db/specific/{vendor}