multi left outer join

src/main/java/com/rest/api/controller/HelloController.java

@@ -1,18 +1,27 @@
 package com.rest.api.controller;
 
+import com.rest.api.entity.Employ;
+import com.rest.api.entity.Member;
+import com.rest.api.repo.EmployJpaRepo;
+import com.rest.api.repo.MemberJpaRepo;
 import lombok.Getter;
+import lombok.RequiredArgsConstructor;
 import lombok.Setter;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.ResponseBody;
 
+@RequiredArgsConstructor
 @Slf4j
 @Controller
 public class HelloController {
 
     private static final String HELLO = "helloworld-nice to meet you";
 
+    private final EmployJpaRepo employJpaRepo;
+    private final MemberJpaRepo memberJpaRepo;
+
     @Setter
     @Getter
     public static class Hello {
@@ -21,23 +30,27 @@ public class HelloController {
 
     @GetMapping(value = "/helloworld/string")
     @ResponseBody
-    public String helloworldString() {
+    public Employ helloworldString() {
+
+        Employ employ = Employ.builder().employee(memberJpaRepo.findById(1L).get()).build();
+        employ = employJpaRepo.save(employ);
         log.debug("Helloworld");
         log.info("Helloworld");
-        return HELLO;
+        return employ;
     }
 
     @GetMapping(value = "/helloworld/json")
     @ResponseBody
-    public Hello helloworldJson() {
+    public Employ helloworldJson() {
-        Hello hello = new Hello();
+        return employJpaRepo.findById(2L).get();
-        hello.message = HELLO;
-        return hello;
     }
 
     @GetMapping(value = "/helloworld/page")
     public String helloworld() {
-        return HELLO;
+        memberJpaRepo.save(Member.builder().email("happydaddy@naver.com").name("happydaddy").build());
+        memberJpaRepo.save(Member.builder().email("angrydaddy@naver.com").name("angrydaddy").build());
+        return "true";
+//        return HELLO;
     }
 
     @GetMapping("/helloworld/long-process")

src/main/java/com/rest/api/entity/Employ.java

@@ -0,0 +1,29 @@
+package com.rest.api.entity;
+
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@NoArgsConstructor
+@Entity
+@Getter
+public class Employ {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private long employId;
+    @OneToOne
+    @JoinColumn(name = "employer_id")
+    private Member employer;
+    @OneToOne
+    @JoinColumn(name = "employee_id")
+    private Member employee;
+
+    @Builder
+    public Employ(Member employer, Member employee) {
+        this.employer = employer;
+        this.employee = employee;
+    }
+}

src/main/java/com/rest/api/entity/Member.java

@@ -0,0 +1,28 @@
+package com.rest.api.entity;
+
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+import java.util.Date;
+
+@NoArgsConstructor
+@Entity
+@Getter
+public class Member {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private long uid;
+    @Column(name = "email", unique = true)
+    private String email;
+    private String name;
+    private Date createDate;
+
+    @Builder
+    public Member(String email, String name) {
+        this.email = email;
+        this.name = name;
+        this.createDate = new Date();
+    }
+}

src/main/java/com/rest/api/repo/EmployJpaRepo.java

@@ -0,0 +1,7 @@
+package com.rest.api.repo;
+
+import com.rest.api.entity.Employ;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface EmployJpaRepo extends JpaRepository<Employ, Long> {
+}

src/main/java/com/rest/api/repo/MemberJpaRepo.java

@@ -0,0 +1,7 @@
+package com.rest.api.repo;
+
+import com.rest.api.entity.Member;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface MemberJpaRepo extends JpaRepository<Member, Long> {
+}