walex
Flyway
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walex | Flyway | |
---|---|---|
17 | 81 | |
251 | 7,775 | |
- | 1.2% | |
9.1 | 7.2 | |
19 days ago | 8 days ago | |
Elixir | Java | |
MIT License | Apache License 2.0 |
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walex
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The Guide to PostgreSQL Data Change Tracking
The WAL CDC approach: https://github.com/cpursley/walex?tab=readme-ov-file#publica...
CREATE PUBLICATION news_item FOR TABLE news WHERE (topic IS "AAPL");
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Elixir Nitpicks
What do you mean testing with processes?
I won't suggest these are the best written tests, but I test various processes, supervisors, etc like this:
https://github.com/cpursley/walex/blob/master/test/walex/sup...
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PostgreSQL Is Enough
You don’t send the entire WAL, just what you subscribe to - and you can even filter via SQL: https://github.com/cpursley/walex?tab=readme-ov-file#publica...
- A Technical Dive into PostgreSQL's replication mechanisms
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Fly Postgres, Managed by Supabase
What we do is much if the business logic in Postgres. But then there’s all the other stuff like external integrations, etc.
We handled that by having an Even system built on the Postgres WAL that we use like a callback system.
I put together a little library in Elixir (that originally started out as forked Supabase realtime) for this:
https://github.com/cpursley/walex
Recently added the ability to configure WalEx to forward events to webhooks or EventRelay (so you don’t need to know Elixir).
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All the ways to capture changes in Postgres
If you're using Elixir, check out https://github.com/cpursley/walex
I've actually been thinking about turning this idea into a product where you can just point it at your postgres database and select the tables you want to listen to (with filters, like you describe). And have that forwarded to a webhook (with possibility of other protocols).
I'd love to hear folks thoughts on that (and if it would be something people would pay for).
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Show HN: ElectricSQL, Postgres to SQLite active-active sync for local-first apps
Neat, this is the pattern I've been thinking about for a while now. Also glad to see this is Elixir based.
I've been using https://github.com/cpursley/walex (basically a fork of cainophile via a fork for subabase) to listen to Postgres changes in Elixir.
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How to Listen to Database Changes Using Postgres Triggers in Elixir
https://github.com/cpursley/walex
Which is based on WAL logs and doesnt have the same limitations.
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PostgreSQL Logical Replication Gotchas
Great writeup, just added this to the WalEx readme:
https://github.com/cpursley/walex
(WalEx is an Elixir lib for listening to the WAL and perform callback-like actions with the data)
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We used Elixir's Observer to hunt down bottlenecks
Very cool.
I'm using Elixir to listen to change events via https://github.com/cpursley/walex (which I basically ripped off from Supabase).
Flyway
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Let's write a simple microservice in Clojure
The session logs show that the application loads configurations and establishes a connection with a PostgreSQL database. This involves initializing a HikariCP connection pool and Flyway for database migrations. The logs confirm that the database schema validation and migration checks were successful. The startup of the Jetty HTTP server follows, and the server becomes operational and ready to accept requests on the specified port.
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Ask HN: What tool(s) do you use to code review and deploy SQL scripts?
Also RedGate, but Flyway has some reasons to recommend it over RedGate Deploy depending on your DBAs/workflows: https://flywaydb.org/
(Though I don't think it is "complete" or "perfect", either.)
EF Migrations are in a really good place now if you like/don't mind C# as a language (and you can easily embed SQL inside the C#, too, but there are benefits to being able to also run high level C# code). With today's tooling you can package your migration "runner application" as a single deployable executable for most platforms. You can build the executable once and run it in all your environments. (The same tool that updates your QA and Staging updates your Prod, testably running the same migrations.) Given the single executable deployable I might even consider using it for projects not themselves written in C#.
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PostgreSQL Is Enough
There is a bit of tooling needed but is already around. For Java for example I had very good experience with a combination of flyway [1] for migrations, testcontainers [2] for making integration tests as easy as unit tests and querydsl [3] for a query and mapping layer.
[1] https://github.com/flyway/flyway
[2] https://java.testcontainers.org/modules/databases/postgres/
[3] https://github.com/querydsl/querydsl
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Using Flyway to version your database
When software starts using a database, it's advisable to have version control, just as we have Github to control our source code. This is all to be sure about what was executed for that specific version. For Java and Spring boot, we have the Flyway framework that aims to resolve this situation, free of charge.
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CI/CD for Databricks
If you're looking for tools, like https://www.liquibase.com/ or https://flywaydb.org/, which are database-state-based schema migration toolkits - it might be relatively straightforward to build similar ones using Databricks SQL drivers.
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Working with jOOQ and Flyway using Testcontainers
Honestly I kind of wish there was a Lukas Eder database migration library. Call it whatever jooq-migration. At least I would have more insight of what is going on (<-- seriously look at the commit history).
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Strategy to run database scripts on Kubernetes
This is a 4th option, which should play nice with ArgoCD. The following example runs flyway as a k8s job. The desired migration changes are recorded as files within the chart. This helm chart can be integrated with your application (Using hooks to determine when the migration job is run) or run manually.
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How do your teams run DB migrations?
By using an opinionated framework within the app/service (like Flyway, Migrate, Diesel, etc). Schema migrations happen on app/service start-up.
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I've never created a production database from scratch and am wondering how much trouble it would be to transition a one-to-one relationship to a one-to-many relationship if I determine at some point that the latter is required.
Depending on the language or platform there are libraries you can use to manage this, such as Prisma on node and Flyway for Java/JVM.
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How should I document and/or automate schema changes?
It's probably overkill but I've used github plus flyway at a couple places in the past which is pretty nice tool for tracking changes to a variety of db's, it's also very helpful if you ever need to replicate a db in a new region/environment.
What are some alternatives?
PolarDB-for-PostgreSQL - A cloud-native database based on PostgreSQL developed by Alibaba Cloud.
alembic - A database migrations tool for SQLAlchemy.
neon - Neon: Serverless Postgres. We separated storage and compute to offer autoscaling, branching, and bottomless storage.
HikariCP - 光 HikariCP・A solid, high-performance, JDBC connection pool at last.
realtime - Broadcast, Presence, and Postgres Changes via WebSockets
roundhouse - RoundhousE is a Database Migration Utility for .NET using sql files and versioning based on source control
libcluster - Automatic cluster formation/healing for Elixir applications
H2 - H2 is an embeddable RDBMS written in Java.
worker - High performance Node.js/PostgreSQL job queue (also suitable for getting jobs generated by PostgreSQL triggers/functions out into a different work queue)
dbmate - :rocket: A lightweight, framework-agnostic database migration tool.
helm-charts - neondatabase helm charts
Hibernate - Hibernate's core Object/Relational Mapping functionality