QueryDSL文档

spring-date-jpa的javasql

动态条件查询

    <build>
        <plugins>
            <plugin>
                <dependencies>
                    <dependency>
                        <groupId>com.querydsl</groupId>
                        <artifactId>querydsl-apt</artifactId>
                        <version>${querydsl.version}</version>
                    </dependency>
                </dependencies>
                <groupId>com.mysema.maven</groupId>
                <artifactId>apt-maven-plugin</artifactId>
                <version>1.1.3</version>
                <executions>
                    <execution>
                        <phase>generate-sources</phase>
                        <goals>
                            <goal>process</goal>
                        </goals>
                        <configuration>
                            <outputDirectory>target/generated-sources/queries</outputDirectory>
                            <processor>com.querydsl.apt.jpa.JPAAnnotationProcessor</processor>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

注入：
 @Resource
    private EntityManager entityManager;

代码：
 JPAQueryFactory jpaQueryFactory = new JPAQueryFactory(entityManager);

        List<CarInfo> fetch = jpaQueryFactory.selectFrom(QCarInfo.qcarInfo).fetch();