java组建映射

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组建映射其实就是一个所属关系，例如把学生作为一个主体，则学生证这个客体就属于学生主体。以编程的方式解释就是
有一个student类和一个studentcard类，要把这两个类映射到一张表中，就把student类作为主体，studentcard类为客体。
package hibernate002test.copy;

public class StudnetIdCard {

private int idnumber;

public int getIdnumber() {
    return idnumber;
}

public void setIdnumber(int idnumber) {
    this.idnumber = idnumber;
}

}
//主体类
package hibernate002test.copy;

import javax.persistence.Embedded;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

public class Student {
private int id;
private String name;
private int age;
private StudnetIdCard card;

@Id
@GeneratedValue
public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getAge() {
    return age;
}

public void setAge(int age) {
    this.age = age;
}

@Embedded
public StudnetIdCard getCard() {
    return card;
}

public void setCard(StudnetIdCard card) {
    this.card = card;
}

}
//测试类
package datatest;

import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.tool.hbm2ddl.SchemaExport;
/**
* 在一对一双向关联时要使用例如：@OneToOne(mappedBy=”wife”)
* @author Lenovo
*
*/
public class Test {

@org.junit.Test
public void test() {
   new SchemaExport(new AnnotationConfiguration().configure()).create(false,true);
}

}