hibernate(4)

이번엔 두개의 클래스를 하나의 테이블로 만드는 법을 살펴 보자. 

package com.zest.hibernate.chapter3;
 
import javax.persistence.Column;
import javax.persistence.Embedded;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.SecondaryTable;
import javax.persistence.Table;
 
 
@Entity
public class School {
 
    
    @Id
    @GeneratedValue
    private int schoolId;
    private String schoolName;
    
    @Embedded
    private SchoolDetail schoolDetail;
    
    
    public SchoolDetail getSchoolDetail() {
        return schoolDetail;
    }
    public void setSchoolDetail(SchoolDetail schoolDetail) {
        this.schoolDetail = schoolDetail;
    }
    public int getSchoolId() {
        return schoolId;
    }
    public void setSchoolId(int schoolId) {
        this.schoolId = schoolId;
    }
    public String getSchoolName() {
        return schoolName;
    }
    public void setSchoolName(String schoolName) {
        this.schoolName = schoolName;
    }
    
    
    
    
}
 

 
package com.zest.hibernate.chapter3;
 
import javax.persistence.Embeddable;
 
@Embeddable
public class SchoolDetail {
 
    private String schoolAddress;
    private boolean isPublishSchool;
    private int studentCount;
    
    public String getSchoolAddress() {
        return schoolAddress;
    }
    public void setSchoolAddress(String schoolAddress) {
        this.schoolAddress = schoolAddress;
    }
    public boolean isPublishSchool() {
        return isPublishSchool;
    }
    public void setPublishSchool(boolean isPublishSchool) {
        this.isPublishSchool = isPublishSchool;
    }
    public int getStudentCount() {
        return studentCount;
    }
    public void setStudentCount(int studentCount) {
        this.studentCount = studentCount;
    }
    
    
}
 

두개의 클래스가 있는데 새로운 어노테이션 발견....

부모가 되는 클래스는에는 @Embeded 라는 어노테이션을 쓰고 자식이 되는 클래스에는 @Embedable 어노테이션을 사용한다. 

나머진 기존과 다를게 없다. 그럼 테스트코드. ㄱㄱ

 
package com.zest.hibernate.chapter3;
 
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.tool.hbm2ddl.SchemaExport;
import org.junit.Test;
 
import com.zest.hibernate.chapter2.Customer;
 
public class SchoolTest {
 
    @Test
    public void school1() {
        AnnotationConfiguration config = new AnnotationConfiguration();
        config.addAnnotatedClass(School.class);
        config.configure("hibernate.cfg.xml");
 
        new SchemaExport(config).create(true, true);
 
        // 아래 두개의 구문은 객체를 트랜잭션을 컨트롤.
        SessionFactory factory = config.buildSessionFactory();
        Session session = factory.getCurrentSession();
 
        session.beginTransaction();
 
        SchoolDetail annsDetail= new SchoolDetail();
        annsDetail.setPublishSchool(false);
        annsDetail.setSchoolAddress("101 washington");
        annsDetail.setStudentCount(300);
        
        School stanns = new School();
        stanns.setSchoolName("st. anns school");
        stanns.setSchoolDetail(annsDetail);
        
        session.save(stanns);
        session.getTransaction().commit();
    }
}
 

테스트 코드는 두개의 객체를 사용하여 트랜잰션에 묶어준다. 그럼 결과 sql문을 보자. 

 
Hibernate: insert into TESTSCHEMA.School (isPublishSchool, schoolAddress, studentCount, schoolName, schoolId) values (?, ?, ?, ?, ?)

이런 문구가 나올것이다.