[QueryDSL] QueryDSL 설정

Spring Boot 3.x QueryDSL 설정

build.gradle

plugins {
    id 'java'
    id 'org.springframework.boot' version '3.3.1'
    id 'io.spring.dependency-management' version '1.1.5'
}

group = 'study'
version = '0.0.1-SNAPSHOT'

java {
    toolchain {
        languageVersion = JavaLanguageVersion.of(17)
    }
}

configurations {
    compileOnly {
        extendsFrom annotationProcessor
    }
}

repositories {
    mavenCentral()
}

dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
    implementation 'org.springframework.boot:spring-boot-starter-web'
    compileOnly 'org.projectlombok:lombok'
    runtimeOnly 'com.h2database:h2'
    annotationProcessor 'org.projectlombok:lombok'
    testImplementation 'org.springframework.boot:spring-boot-starter-test'
    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'

    //test 롬복 사용
    testCompileOnly 'org.projectlombok:lombok'
    testAnnotationProcessor 'org.projectlombok:lombok'

    //QueryDSL 추가
    implementation 'com.querydsl:querydsl-jpa:5.0.0:jakarta'
    annotationProcessor "com.querydsl:querydsl-apt:${dependencyManagement.importedProperties['querydsl.version']}:jakarta"
    annotationProcessor "jakarta.annotation:jakarta.annotation-api"
    annotationProcessor "jakarta.persistence:jakarta.persistence-api"

}

tasks.named('test') {
    useJUnitPlatform()
}

환경설정 테스트

package study.querydsl.entity;

import jakarta.persistence.Entity;
import jakarta.persistence.GeneratedValue;
import jakarta.persistence.Id;
import lombok.Getter;
import lombok.Setter;

@Entity
@Getter @Setter
public class Hello {

    @Id
    @GeneratedValue
    private Long id;
}

IntelliJ IDEA로 빌드

• 생성 gradle -> Tasks -> build
• 삭제 gradle -> Tasks -> clean
  
• /src/main/generated 하위에 QClass가 생성됨
  
• git에 올라가지 않도록 .gitignore에 /src/main/generated 추가

테스트

@PersistenceContext
    EntityManager em;

    @Test
    void contextLoads() {
        Hello hello = new Hello();
        em.persist(hello);

        JPAQueryFactory query = new JPAQueryFactory(em);
        QHello qHello = QHello.hello;

        Hello result = query
                .selectFrom(qHello)
                .fetchOne();

        assertThat(result).isEqualTo(hello);
        assertThat(result.getId()).isEqualTo(hello.getId());
    }