UMC-EWHA#31 Feat : Upload JpaMain

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>jpa-basic</groupId>
+    <artifactId>ex1-hello-jpa</artifactId>
+    <version>1.0.0</version>
+
+
+
+
+
+    <dependencies>
+
+
+
+
+        <dependency>
+            <groupId>org.hibernate</groupId>
+            <artifactId>hibernate-entitymanager</artifactId>
+            <version>5.3.10.Final</version>
+        </dependency>
+
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <version> 2.1.214 </version>
+        </dependency>
+
+
+
+
+
+
+    </dependencies>
+    <properties>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+
+    </properties>
+
+
+</project>

src/main/java/hellojpa/JpaMain.java

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+package hellojpa;
+
+import javax.persistence.EntityManager;
+import javax.persistence.EntityManagerFactory;
+import javax.persistence.EntityTransaction;
+import javax.persistence.Persistence;
+import java.util.List;
+
+public class JpaMain {
+    public static void main(String[] args){
+        EntityManagerFactory emf = Persistence.createEntityManagerFactory("hello");
+
+        EntityManager em = emf.createEntityManager();
+        EntityTransaction tx = em.getTransaction();
+        tx.begin();//트랜잭션 시작
+
+        try {
+            //tx.begin(); //트랜잭션 시작
+            logic(em); //비지니스 로직 실행
+            for(int i=0;i<100;i++) {
+                Member member = new Member();
+                member.setUsername("member1"+i);
+                member.setAge(i);
+                em.persist(member);
+            }
+            em.flush();
+            em.clear();
+
+
+           List<Member> result =  em.createQuery("select m from Member m order by m.age desc", Member.class)
+                            .setFirstResult(1)
+                            .setMaxResults(10)
+                            .getResultList();
+            System.out.println("result = "+ result.size());
+            for(Member member1 : result){
+                System.out.println("member1 ="+member1);
+            }
+
+
+            tx.commit(); //트랜잭션 커밋
+          /**  //저장
+            Team team = new Team();
+            team.setName("TeamA");
+           // team.getMembers().add(member);
+            em.persist(team);
+
+
+
+            Member member = new Member();
+            member.setUsername("member1");
+            member.setTeam(team);
+            em.persist(member);
+
+
+
+
+
+            em.flush();
+            em.clear();
+
+            Member findMember = em.find(Member.class, member.getId());
+            List<Member> members = findMember.getTeam().getMembers();
+
+            for(Member m:members){
+                System.out.println("m= "+m.getUsername());
+            }
+            Team findTeam = findMember.getTeam();
+            System.out.println("findTeam = "+ findTeam.getName());**/
+
+        } catch (Exception e){
+            tx.rollback(); //트랜잭션 롤백
+        } finally {
+            em.close();
+        }
+
+        emf.close();
+
+    }
+
+    private static void logic(EntityManager em){
+        String id ="id1";
+        Member member = new Member();
+        member.setId(id);
+        member.setUsername("윤진");
+        member.setAge(2);
+
+        em.persist(member);
+
+
+        member.setAge(20);
+        Member findMember = em.find(Member.class, id);
+        System.out.println("findMember="+findMember.getUsername()+", age="+ findMember.getAge());
+
+
+        em.remove(member);
+
+
+
+    }
+
+
+
+
+
+
+
+
+
+
+
+
+}

src/main/java/hellojpa/Member.java

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+package hellojpa;
+import javax.persistence.*;
+import java.util.Date;
+
+
+@Entity
+public class Member {
+
+ @Id @GeneratedValue
+ @Column(name = "MEMBER_ID")
+ private String id;
+
+ public String getId() {
+  return id;
+ }
+
+ public void setId(String id) {
+  this.id = id;
+ }
+
+ @Column(name = "USERNAME")
+ private String username;
+
+ public String getUsername() {
+  return username;
+ }
+
+ public void setUsername(String username) {
+  this.username = username;
+ }
+
+
+
+ //@Column(name = "TEAM_ID")
+ //
+ //private Long teamId;
+
+ @ManyToOne
+ @JoinColumn(name ="Team_ID")
+ private Team team;
+
+ public Team getTeam() {
+  return team;
+ }
+
+ public void setTeam(Team team) {
+  this.team = team;
+ }
+ @Column(name = "AGE")
+ private int age;
+ public void setAge(int age) {
+  this.age = age;
+ }
+
+ public int getAge() {
+  return age;
+ }
+//public Long getTeamId() {
+ // return teamId;
+// }
+
+ //public void setTeamId(Long teamId) {
+ // this.teamId = teamId;
+ //}
+
+
+ @Override
+ public String toString() {
+  return "Member{" +
+          "id='" + id + '\'' +
+          ", username='" + username + '\'' +
+          ", age=" + age +
+          '}';
+ }
+}

src/main/java/hellojpa/RoleType.java

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+package hellojpa;
+
+public enum RoleType {
+    USER, ADMIN
+}

src/main/java/hellojpa/Team.java

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+package hellojpa;
+
+import javax.persistence.*;
+import java.util.ArrayList;
+import java.util.List;
+
+@Entity
+public class Team {
+    @Id
+    @GeneratedValue
+    @Column(name = "TEAM_ID")
+    private Long id;
+    private String name;
+
+    @OneToMany(mappedBy = "team")
+    private List<Member> members = new ArrayList<>();
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public List<Member> getMembers() {
+        return members;
+    }
+
+    public void setMembers(List<Member> members) {
+        this.members = members;
+    }
+}

src/main/resources/META-INF/persistence.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<persistence version="2.2"
+             xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+             xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_2.xsd">
+    <persistence-unit name="hello">
+        <properties>
+            <!-- 필수 속성 -->
+            <property name="javax.persistence.jdbc.driver" value="org.h2.Driver"/>
+            <property name="javax.persistence.jdbc.user" value="sa"/>
+            <property name="javax.persistence.jdbc.password" value=""/>
+            <property name="javax.persistence.jdbc.url" value="jdbc:h2:tcp://localhost/~/test"/>
+            <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect"/>
+
+            <!-- 옵션 -->
+            <property name="hibernate.show_sql" value="true"/>
+            <property name="hibernate.format_sql" value="true"/>
+            <property name="hibernate.use_sql_comments" value="true"/>
+            <property name="hibernate.jdbc.batch_size" value="10"/>
+            <property name="hibernate.hbm2ddl.auto" value="create" />
+        </properties>
+    </persistence-unit>
+</persistence>

target/classes/META-INF/persistence.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<persistence version="2.2"
+             xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+             xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_2.xsd">
+    <persistence-unit name="hello">
+        <properties>
+            <!-- 필수 속성 -->
+            <property name="javax.persistence.jdbc.driver" value="org.h2.Driver"/>
+            <property name="javax.persistence.jdbc.user" value="sa"/>
+            <property name="javax.persistence.jdbc.password" value=""/>
+            <property name="javax.persistence.jdbc.url" value="jdbc:h2:tcp://localhost/~/test"/>
+            <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect"/>
+
+            <!-- 옵션 -->
+            <property name="hibernate.show_sql" value="true"/>
+            <property name="hibernate.format_sql" value="true"/>
+            <property name="hibernate.use_sql_comments" value="true"/>
+            <property name="hibernate.jdbc.batch_size" value="10"/>
+            <property name="hibernate.hbm2ddl.auto" value="create" />
+        </properties>
+    </persistence-unit>
+</persistence>