Querydsl
walex
Querydsl | walex | |
---|---|---|
6 | 17 | |
4,575 | 251 | |
0.5% | - | |
4.1 | 9.1 | |
3 days ago | 22 days ago | |
Java | Elixir | |
Apache License 2.0 | MIT License |
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Querydsl
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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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Apache Empire-Db: Full SQL Freedom for Java
http://querydsl.com/ also seems similar
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Useful & Unknown Java Libraries - Piotr's TechBlog
As for JPA: I cannot miss the QueryDSL library for building typesafe queries. Another interesting alternative is Jinq, that provides a java stream api to query entities.
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You might not need an ORM
> all I really want is a nice API for building queries (that actually supports all underlying database features) and automatic mapping of the results to whatever objects/structs and primitives the language supports.
For Java based solutions, check out https://www.jooq.org/ or http://querydsl.com/
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How do access sql through java in the real world?
QueryDsl -- http://querydsl.com
- How to build SQL query strings?
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).
What are some alternatives?
jOOQ - jOOQ is the best way to write SQL in Java
PolarDB-for-PostgreSQL - A cloud-native database based on PostgreSQL developed by Alibaba Cloud.
JDBI - The Jdbi library provides convenient, idiomatic access to relational databases in Java and other JVM technologies such as Kotlin, Clojure or Scala.
neon - Neon: Serverless Postgres. We separated storage and compute to offer autoscaling, branching, and bottomless storage.
Jinq - LINQ-style queries for Java 8
realtime - Broadcast, Presence, and Postgres Changes via WebSockets
Apache Hive - Apache Hive
libcluster - Automatic cluster formation/healing for Elixir applications
Spring Data JPA - Simplifies the development of creating a JPA-based data access layer.
worker - High performance Node.js/PostgreSQL job queue (also suitable for getting jobs generated by PostgreSQL triggers/functions out into a different work queue)
Presto - The official home of the Presto distributed SQL query engine for big data
helm-charts - neondatabase helm charts