querydsl/querydsl-jdo/README.md

Querydsl JDO

The JDO module provides integration with the JDO API.

Maven integration

Add the following dependencies to your Maven project :

<dependency>
  <groupId>com.querydsl</groupId>
  <artifactId>querydsl-apt</artifactId>
  <version>${querydsl.version}</version>
  <scope>provided</scope>
</dependency>        
    
<dependency>
  <groupId>com.querydsl</groupId>
  <artifactId>querydsl-jdo</artifactId>
  <version>${querydsl.version}</version>
</dependency>

And now, configure the Maven APT plugin which generates the query types used by Querydsl :

<project>
  <build>
    <plugins>
      ...
      <plugin>
        <groupId>com.mysema.maven</groupId>
        <artifactId>apt-maven-plugin</artifactId>
        <version>1.1.3</version>
        <executions>
          <execution>
            <goals>
              <goal>process</goal>
            </goals>
            <configuration>
              <outputDirectory>target/generated-sources/java</outputDirectory>
              <processor>com.querydsl.apt.jdo.JDOAnnotationProcessor</processor>
            </configuration>
          </execution>
        </executions>
      </plugin>
      ...
    </plugins>
  </build>
</project>

The JDOAnnotationProcessor finds domain types annotated with the javax.jdo.annotations.PersistenceCapable annotation and generates Querydsl query types for them.

Run clean install and you will get your Query types generated into target/generated-sources/java.

If you use Eclipse, run mvn eclipse:eclipse to update your Eclipse project to include target/generated-sources/java as a source folder.

Now you are able to construct JDOQL query instances and instances of the query domain model.

Querying

Querying with Querydsl JDO is as simple as this :

QCustomer customer = QCustomer.customer;
JDOQuery<?> query = new JDOQuery<Void>(pm);
Customer bob = query.select(customer)
  .from(customer)
  .where(customer.firstName.eq("Bob"))
  .fetchOne();
query.close();

For more information on the Querydsl JDO module visit the reference documentation http://www.querydsl.com/static/querydsl/latest/reference/html/ch02s02.html