Using Flyway as a Multi-Database Migration System

Flyway can scale easily to enterprise-scale database systems, even if they involve a mix of relational database systems, are cloud-based, containerized or involve complex authentication. This article demonstrates how we can use Flyway Teams to do a single-batch, multi-database migration, comprising SQL Server, Oracle Cloud, PostgreSQL, MySQL and SQLite databases. Read more

How to Write and Debug a PowerShell Callback for Flyway Migrations

We can use callbacks in Flyway to plug into any part of the Flyway lifecycle and run various database tasks before or after a particular event takes place. In this article I've tried to assemble a 'best practice' guide for writing callbacks to ensure that the scripts always behave predictably, and so that when things go awry the cause is easy to spot, without hours of painful scrolling through Flyway output. Read more

Passing Parameters and Settings to Flyway Scripts

This article explains the various ways of using placeholders to pass information and settings to any Flyway script, to gain bit of extra flexibility in a migration run., providing examples of conditional execution, running SQL expressions using environment variables and even one of using placeholders in a callback to send a warning notification to your phone, after a migration completes. Read more

Piping, Filtering and Using Flyway Output in PowerShell

Flyway's output is often overwhelmed with verbose messages, most of which we can ignore but some of which provide vital warnings about failed compilations, or useful details about what a migration or callback did. I'll show how to use some pipeline-aware PowerShell functions to filter out and save the bits we want and pass the results along in a form that is useful to the next process in the pipeline. Read more

Executing Optional Code in Flyway Callbacks

When you are building or migrating a database, it is nice to have a system that you can easily configure for various tasks, such as logging, loading or dumping data, or backing up of the database. This article demonstrates how we can use a Flyway placeholder as a simple on/off switch for each task, during Flyway migrations. Read more

Try Before You Commit in Flyway

Sometimes we want to check whether it is possible to run a Flyway migration without error, but not actually make the changes. We might just need to 'sanity test' the performance of a migration on the Staging server, for example. By using a placeholder 'switch' to trigger a SQL Exception, we can get Flyway to roll-back its transaction, and therefore the migration, on demand. Read more

Performance Testing Databases with Flyway and PowerShell

Performance tests are central to the quality of the database changes we deliver because they ensure that any business process that accesses the database continues to return its results in an acceptable time. When Flyway creates a new version of the database, it is the ideal time to run these performance checks. Read more

Running Unit and Integration Tests during Flyway Migrations

In this article I'll give a practical example of developing a database, with Flyway, in such a way that it is automatically tested with whatever unit tests and integration tests you specify whenever you migrate the branch you're working on to the next version. If a test fails, you can work out why, undo the migration and then try again. Read more

Basic Functional Testing for Databases Using Flyway

How to use Flyway Teams to run basic tests whenever it successfully executes a migration, checking that all the business processes supported by our database always produce the expected results. Read more

Debugging Flyway Callbacks and Migrations that Use Placeholders

Placeholders come in very handy in Flyway, but troubleshooting the SQL migration and callback scripts that use them can be tricky. This articles demonstrates how to develop, test and debug these scripts in a tool designed for these tasks, such as SSMS, leaving Flyway to do what it's designed for, which is running the scripts. Read more

Scripting with Flyway Teams and PowerShell

During the development cycle, the mechanics of reliable delivery must not be allowed to dominate the design work. With script callbacks in Flyway Teams, many of the development tasks required during a database migration can happen automatically, producing reports, build scripts, code reviews, or documentation. Read more

One Flyway Migration Script for Diverse Database Systems

How to create a single set of SQL migration scripts for Flyway that we can use across multiple database systems, or for all regional variants of a database. Read more

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