[Kotlin] Spring Boot QueryDsl
Spring Boot | (Update : 2022-06-16)
Language : KO
build.gradle.kts
plugins {
kotlin("plugin.jpa") version kotlinVersion
kotlin("kapt") version kotlinVersion
}
val querydslVersion = "5.0.0"
dependencies {
implementation("com.querydsl:querydsl-jpa:$querydslVersion")
// plugin kapt 설정하여 build 후 추가
kapt("com.querydsl:querydsl-apt:$querydslVersion:jpa")
kapt("org.springframework.boot:spring-boot-configuration-processor")
}
JPAQueryFactory를 Bean으로 등록
@Configuration
class QueryDslConfig(
@PersistenceContext
val entityManager: EntityManager
) {
@Bean
fun jpaQueryFactory(): JPAQueryFactory {
return JPAQueryFactory(entityManager)
}
}
QuerydslRepositorySupport
@Repository
abstract class CustomQuerydslRepositorySupport(domainClass: Class<*>): QuerydslRepositorySupport(domainClass) {
private var queryFactory: JPAQueryFactory by Delegates.notNull()
@PersistenceContext
override fun setEntityManager(entityManager: EntityManager) {
super.setEntityManager(entityManager)
this.queryFactory = JPAQueryFactory(entityManager)
}
protected fun <T> select(clazz: Class<T>, vararg expr: Expression<*>): JPAQuery<T> {
return queryFactory.select(Projections.fields(clazz, *expr))
}
protected fun <T> selectFrom(from: EntityPath<T>): JPAQuery<T> {
return queryFactory.selectFrom(from)
}
}
Repository
interface UserJpaRepository: JpaRepository<User, Long> {
}
class UserRepository (
private val userJRepo: UserJpaRepository,
val query: JPAQueryFactory
) : UserJpaRepository by userJRepo, CustomQuerydslRepositorySupport(User::class.java) {
}