Running Flyway Pre-Migration Checks on the Database

This article demonstrates how to run a preliminary check that issues a warning, or throws an error, if the conditions aren't met for a Flyway migration to succeed. It provides some example checks for PostgreSQL databases that use Flyway SQL callbacks to ensure the server is running the correct PostgreSQL version, or that the database has a required extension installed. 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

Using SQL Backup in Flyway Development Work

For a development team, SQL Backup provides a simple way to restore development or test databases, if required, while minimizing the tedium of the task of taking, managing, and restoring the backups. We can generate the required backup commands in the GUI and then use them to construct a SQL script that backs up all the required databases. We can even use the backup commands in a beforeMigrate SQL callback, in Flyway, to make sure the current version is safely backed up before we run migration. 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

A Flyway Teams Callback Script for Auditing SQL Migrations

Demonstrates a cross-database PowerShell callback script for reporting on and auditing Flyway migrations, telling you which scripts were used to create each version, when they were run, who ran them and more. 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

Checking for Missing Module References in a SQL Server Database Using Flyway

There are certain checks that need to be done after a database migration is complete. One good example of this is the check that a migration script, such as one that merges changes from a branch into main, doesn't cause 'invalid objects' (a.k.a. 'missing references') in your databases. I'll show you how to run this check, using sp_RefreshSQLModule, and incorporate it into a Flyway "after" migration script. Read more

Getting Data In and Out of SQL Server Flyway Builds

This article provides SQL "bulk copy" routines to extract data from and load it into a SQL Server database, rapidly, and demonstrates a way to automatically bulk insert the test data in a Flyway build, using a SQL callback. Read more

Customizing Database Deployments using Flyway Callbacks and Placeholders

How to customize a database deployment process using Flyway, demonstrating how to incorporate tasks such stamping a version number into the latest database build, or writing to the SQL Server log. Read more

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