Querydsl is a framework which enables the construction of type-safe SQL-like queries for multiple backends including JPA, MongoDB and SQL in Java.

Instead of writing queries as inline strings or externalizing them into XML files they are constructed via a fluent API.

Getting started

Use these tutorials to get started

• Querying JPA
• Querying SQL
• Querying Mongodb
• Querying Lucene
• Querying Collections
• Querydsl Spatial
• Querying JDO

Examples

Querydsl example projects

Support

Free support is provided in the Discussion Section and on StackOverflow. Please do not post questions as issue. Such issues will be closed immediately.

How to build

Querydsl provides releases via public Maven repositories, but you can also build the sources yourself like this

$ mvn -Pquickbuild,{projectname} clean install

Where projectname is one of the Maven profiles (e.g. jpa, sql, mongodb, etc. or all)

For more information visit the project homepage at https://querydsl.github.io.

Docker Compose setup

For running tests, a Docker Compose setup is provided. It comes with the following databases:

• Oracle Express Edition 11g
• PostgreSQL 9.1.10
• MySQL 5.5.34
• Cubrid 9.2

You will need to install Docker and docker-compose.

To launch the database containers:

$ docker-compose up -d

All of the databases' default ports are forwarded to the host machine.

How to contribute

GitHub pull requests are the way to contribute to Querydsl.

If you are unsure about the details of a contribution, ask on the Querydsl Google Group or create a ticket on GitHub.

If you want to join Slack workspace for Querydsl contributors join by following this link.