Flyway

Database Migrations Made Easy.

• Objective : database state management

• State ?

– A list of changesets (table, sp, func, db, …)

• How do we know the state of a database at a « t » moment ?

Database migration ?

Database migration ?

State 1 State 2

Database migration : versioning

Version

15.12.4

Version

15.12.15

• Database migration Tools

– In JAVA

– Command line / API

– Use versioning

– Very light

• Work with a list of SQL migration scripts

– Schema update

– Data update

Flyway: http://flywaydb.org/

Flyway – How it works ?

Database

Current version

=> 2.0.1

=> Migrate 2.0.1

Get scripts Migrate

• The flyway table : « schema_version »

Flyway – Database version

• 5 actions

– Migrate

– Clean

– Info

– Validate

– Baseline

Flyway - Actions

Flyway - Migrate

Flyway - Clean

Flyway - Info

Flyway - Validate

Flyway - Baseline

Demo

Benefits

• Work with just a list of migration scripts

• Automatically find which scripts to execute to update the database to a specific version

• Show the next scripts to apply from the current version

• Easy handle of backward compatibility and scheduled obsolescence

Disadvantages

• Java : hard to integrate in a custom .NET application

• Scripts migration error handling is very light

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Find out more• On https://techblog.betclicgroup.com/

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