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YoonTaeMinnnnYoonTaeMinnnn
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querydsl - dto, dynamic query, bulk
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4 files changed

+320
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4 files changed

+320
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‎querydsl/src/main/java/study/querydsl/dto/MemberDto.java

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@@ -0,0 +1,21 @@
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package study.querydsl.dto;
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import com.querydsl.core.annotations.QueryProjection;
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import lombok.AllArgsConstructor;
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import lombok.Data;
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import lombok.NoArgsConstructor;
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@Data
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@NoArgsConstructor
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public class MemberDto {
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private String username;
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private int age;
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@QueryProjection
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public MemberDto(String username, int age) {
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this.username= username;
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this.age= age;
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}
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}

‎querydsl/src/main/java/study/querydsl/dto/UserDto.java

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package study.querydsl.dto;
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import lombok.AllArgsConstructor;
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import lombok.Data;
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import lombok.NoArgsConstructor;
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@Data
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@NoArgsConstructor
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@AllArgsConstructor
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public class UserDto {
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private String username;
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private int age;
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}

‎querydsl/src/main/resources/application.yml

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@@ -12,6 +12,8 @@ spring:
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hibernate:
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show_sql: true
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format_sql: true
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jooq:
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sql-dialect: org.hibernate.dialect.MySQL8Dialect
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logging.level:
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org.hibernate.SQL: debug
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org.hibernate.SQL: debug

‎querydsl/src/test/java/study/querydsl/QuerydslBasicTest.java

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@@ -1,8 +1,13 @@
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package study.querydsl;
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import com.querydsl.core.BooleanBuilder;
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import com.querydsl.core.QueryResults;
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import com.querydsl.core.Tuple;
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import com.querydsl.core.types.Expression;
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import com.querydsl.core.types.ExpressionUtils;
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import com.querydsl.core.types.Predicate;
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import com.querydsl.core.types.Projections;
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import com.querydsl.core.types.dsl.BooleanExpression;
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import com.querydsl.core.types.dsl.Expressions;
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import com.querydsl.jpa.JPAExpressions;
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import com.querydsl.jpa.impl.JPAQuery;
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import org.junit.jupiter.api.Test;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.boot.test.context.SpringBootTest;
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import org.springframework.test.annotation.Commit;
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import org.springframework.transaction.annotation.Transactional;
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import study.querydsl.dto.MemberDto;
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import study.querydsl.dto.QMemberDto;
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import study.querydsl.dto.UserDto;
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import study.querydsl.entity.*;
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import javax.persistence.EntityManager;
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}
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}
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// 프로젝션 대상 하나 인경우
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@Test
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public void simpleProjection() {
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List<String> usernames = jpaQueryFactory
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.select(member.username)
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.from(member)
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.fetch();
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List<Member> members = jpaQueryFactory
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.selectFrom(member)
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.fetch();
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for (String username : usernames) {
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System.out.println("username = " + username);
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}
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for (Member member1 : members) {
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System.out.println("member1 = " + member1);
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}
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}
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// 투플의 경우, 레파지토리 계층에서만 사용 권장
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// dto로 변환 후 사용권장
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@Test
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public void tupleProjection() {
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List<Tuple> tuples = jpaQueryFactory
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.select(member.username, member.age)
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.from(member)
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.fetch();
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for (Tuple tuple : tuples) {
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System.out.println("tuple.get(member.username) = " + tuple.get(member.username));
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System.out.println("tuple.get(member.age) = " + tuple.get(member.age));
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}
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}
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// jpa dto 조회
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@Test
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public void findDto() {
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List<MemberDto> memberDtos = em.createQuery("select new study.querydsl.dto.MemberDto(m.username, m.age) from Member m", MemberDto.class)
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.getResultList();
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for (MemberDto memberDto : memberDtos) {
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System.out.println("memberDto = " + memberDto);
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}
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}
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// dto => 기본생성자 존재해야함
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// setter 주입
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// getter, setter 존재해야함
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@Test
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public void findDtoByQuerydsl() {
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List<MemberDto> memberDtos = jpaQueryFactory
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.select(Projections.bean(MemberDto.class, member.username, member.age))
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.from(member)
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.fetch();
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for (MemberDto memberDto : memberDtos) {
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System.out.println("memberDto = " + memberDto);
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}
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}
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// 필드 입 : getter, setter 없어도됨
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@Test
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public void findDtoByFields() {
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List<MemberDto> memberDtos = jpaQueryFactory
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.select(Projections.fields(MemberDto.class, member.username, member.age))
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.from(member)
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.fetch();
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for (MemberDto memberDto : memberDtos) {
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System.out.println("memberDto = " + memberDto);
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}
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}
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//생성자 주입
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@Test
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public void findDtoByConstructor() {
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List<MemberDto> memberDtos = jpaQueryFactory
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.select(Projections.constructor(MemberDto.class, member.username, member.age))
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.from(member)
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.fetch();
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for (MemberDto memberDto : memberDtos) {
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System.out.println("memberDto = " + memberDto);
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}
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}
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// 필드주입 - 필드이름 = 엔티티이름 같아야함
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// 다를 경우, as 사용
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@Test
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public void findDtoByUserDto() {
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QMember memberSub = new QMember("memberSub");
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List<UserDto> memberDtos = jpaQueryFactory
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.select(Projections.fields(UserDto.class, member.username.as("name"),
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ExpressionUtils.as(JPAExpressions
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.select(memberSub.age.max())
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.from(memberSub), "age"
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)
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)
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)
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.from(member)
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.fetch();
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for (UserDto memberDto : memberDtos) {
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System.out.println("memberDto = " + memberDto);
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}
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}
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// 생성자 주입 - 타입만 같으면 가능
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@Test
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public void findDtoByUserDtoByConstructor() {
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QMember memberSub = new QMember("memberSub");
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List<UserDto> memberDtos = jpaQueryFactory
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.select(Projections.constructor(UserDto.class, member.username,
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JPAExpressions
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.select(memberSub.age.max())
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.from(memberSub)
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)
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)
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.from(member)
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.fetch();
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for (UserDto memberDto : memberDtos) {
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System.out.println("memberDto = " + memberDto);
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}
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}
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// 컴파일 에러 잡기 가능
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// dto -> querydsl에 대한 의존성이 생김 (순수한 dto라 볼수없음)
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// 아키텍쳐에 따라 유연하게 결정
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@Test
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public void findDtoByQueryProjection() {
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List<MemberDto> memberDtos = jpaQueryFactory
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.select(new QMemberDto(member.username, member.age))
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.from(member)
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.fetch();
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for (MemberDto memberDto : memberDtos) {
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System.out.println("memberDto = " + memberDto);
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}
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}
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// 동적쿼리 - 이름,나이 존재하면 where 절에 조건넣음
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@Test
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public void dynamicQuery_BooleanBuilder() {
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String usernameParam = "member1";
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Integer ageParam = null;
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List<Member> result = searchMember1(usernameParam, ageParam);
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assertThat(result.size()).isEqualTo(1);
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}
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//
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private List<Member> searchMember1(String usernameCond, Integer ageCond) {
595+
BooleanBuilder builder = new BooleanBuilder();
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if (usernameCond != null) {
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builder.and(member.username.eq(usernameCond));
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}
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if (ageCond != null) {
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builder.and(member.age.eq(ageCond));
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}
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List<Member> result = jpaQueryFactory
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.selectFrom(member)
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.where(builder)
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.fetch();
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return result;
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}
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// where 절에 null 이면 무시
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// where 절 가독성 좋음
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//querydsl - 재사용성 가능 (자바코드이기 때문에)
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@Test
616+
public void dynamicQueryWhere() {
617+
String usernameParam = "member1";
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Integer ageParam = null;
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List<Member> result = searchMember2(usernameParam, ageParam);
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assertThat(result.size()).isEqualTo(1);
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}
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private List<Member> searchMember2(String usernameCond, Integer ageCond) {
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return jpaQueryFactory
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.selectFrom(member)
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.where(allEq(usernameCond, ageCond))
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.fetch();
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}
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private BooleanExpression ageEq(Integer ageCond) {
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return ageCond != null ? member.age.eq(ageCond) : null;
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}
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private BooleanExpression usernameEq(String usernameCond) {
636+
return usernameCond != null? member.username.eq(usernameCond) : null;
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}
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// 컴포지션 가능
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private Predicate allEq(String usernameCond, Integer ageCond) {
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return usernameEq(usernameCond).and(ageEq(ageCond));
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}
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//벌크연산
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@Test
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public void bulkUpdate() {
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long count = jpaQueryFactory
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.update(member)
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.set(member.username, "비회원")
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.where(member.age.lt(28))
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.execute();
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em.clear();
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// 나이 1 빼기
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// long count2 = jpaQueryFactory
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// .update(member)
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// .set(member.age, member.age.add(-1))
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// .execute();
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List<Member> result = jpaQueryFactory
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.selectFrom(member)
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.fetch();
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for (Member member1 : result) {
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System.out.println("member1 = " + member1.getUsername());
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}
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}
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//벌크 삭제
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@Test
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public void deleteBulk() {
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long count = jpaQueryFactory
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.delete(member)
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.where(member.age.lt(18))
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.execute();
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}
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//sql function : ex) replace 함수
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@Test
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public void sqlFunction() {
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List<String> result = jpaQueryFactory
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.select(
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Expressions.stringTemplate("function('regexp_replace', {0}, {1}, {2})",
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member.username,
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"member",
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"M")
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).from(member)
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.fetch();
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for (String s : result) {
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System.out.println("s = " + s);
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}
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}
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// 소문자 함수
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@Test
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public void sqlFunction2() {
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List<String> result = jpaQueryFactory
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.select(member.username)
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.from(member)
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// .where(member.username.eq(Expressions.stringTemplate("function('lower', {0})", member.username)))
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.where(member.username.eq(member.username.lower()))
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.fetch();
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for (String s : result) {
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System.out.println("s = " + s);
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}
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}
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}

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