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請請你能幫助我如何使用entitymanger在我的數據庫中插入數據?
我有兩個實體來說學生和地址,通過@OneToOne關係releted
@Entity
public class Student implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int idstudent;
private String firstname;
private String name;
@OneToOne
private Adress adress;
//setters and getters
}
public class Adress implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int idadress;
private String street;
private String codezip;
@OneToOne
private Student student;
//getters and setters
}
我想用實體馬槽我試圖通過它不到風度工作
插入數據@PersistenceContext(unitName = "JPADD")
EntityManager em;
Student student = new Student();
student.setfirstname("cc");
student.setname("cc");
Adress adress = new Adress();
adress.setstreet("ccccccccc");
adress.setstudent(student);
em.persist(adress)
em.persist(student);
幫我pleaaaaaaaaase :)
當我刪除adress.setstudent(學生) – wadii 2012-04-28 23:28:01
問題不是它沒有實例化一個EntityManger – wadii 2012-04-28 23:29:45
沒有注意到註釋,[Stack Overflow不是一個心理讀者或水晶球](http://meta.stackexchange.com/a/128551/172496)仍然適用。 – 2012-04-28 23:31:33