Database models have all sorts of useful applications during Flyway development to help us automate those repetitive development tasks that otherwise slow down delivery. This article shows how models can help us automate mundane tasks such as generating a build script for any version of a database or deleting the data from every table. Read more
A database model is a standard document that represents the logical design and structure of a database. If we save a model each time Flyway creates a new version of the database, then we can find out what's in each version, and get an overview of how that structure changed between any two versions. This has all sorts of uses in team-based database development work. Read more
This article demonstrates a cross-RDBMS way of searching through a set of SQL migration files, in the right order, to get a narrative summary of what changes were made, or will be made, to one or more of the tables or routines within each migration file. Getting these summary reports, even from a set of SQL migrations, isn't difficult, but having a few examples makes it a lot quicker to get started. Read more
Armed with a schema comparison engine and an object-level directory of the source for every recent version of the database, you'll be able to remove a lot of the uncertainty around merging database changes back into development. Read more
This article uses Flyway and a PowerShell framework to generate a simple JSON model for each new version of an Oracle database, and then compares models to get a high-level 'narrative' of which tables, views or procedures were changed by each Flyway migration. Read more
As a database gets larger, and development more complex, so it becomes increasingly necessary to be able to search for strings in the source files and the database itself. Maybe you need to find when a table first got created, when a foreign key was added, or to find out which tables lack documentation. I'll show you how to answer these sorts of questions by running simple 'wildcard' searches on your Flyway migration files, or source files, as well as more targeted searches on certain parts of your database model. Read more
If you save a metadata 'model' for every new version of a database created by Flyway, you can compare the current model to the previous one to see what changed. In turn, you can then generate a database E-R diagram that highlights the changed objects, instantly making those changes visible to other team members. Read more
How does one check that a database is definitively at the version that Flyway says it is? Or that a test teardown procedure leaves no trace in the database? Or verify that an undo script returns a database's metadata to that state it should be in for the version to which you're rolling back? This article shows how to do high-level version checks, by comparing JSON models. Read more
If you can generate a file-based (JSON) model for each new version of a database, produced by a Flyway migration, then you have an easy way to run simple reports to help you search, list, and understand the structure of these databases. I'll show how to produce the models using PowerShell and then run some queries against them to generate the reports. Read more
How to integrate Flyway database development with Source control, so that you can track what changes were made and who made them as well as which objects changed between versions, and how. Read more