[JPA] Maven JPA 설정

 

 

?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> 
 <!-- JPA 하이버네이트 --> 
 <dependency> 
 <groupId>org.hibernate</groupId> 
 <artifactId>hibernate-entitymanager</artifactId> 
 <version>5.3.10.Final</version> 
 </dependency> 
 <!-- H2 데이터베이스 --> 
 <dependency> 
 <groupId>com.h2database</groupId> 
 <artifactId>h2</artifactId> 
 <version>1.4.199</version> 
 </dependency> 
 </dependencies> 
</project>

<?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.hbm2ddl.auto" value="create" />--> 
 </properties> 
 </persistence-unit> 
</persistence>

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");
        // 엔티티매니저팩토리 실행시 한번 만들어놈

        EntityManager em = emf.createEntityManager();

        EntityTransaction tx =  em.getTransaction();
        tx.begin();


        try {
            //영속상태
        Member member = em.find(Member.class,150L);
        member.setName("AAAAAA");

        // 엔티티매니저를 통째로 지움
        em.clear();


        System.out.println("==============");

            tx.commit();
        }catch (Exception e){
            tx.rollback();
        } finally {
            em.close();
        }
        emf.close();
    }
}