Hibernate使用注解设定关联关系

一对一关联关系详解：实体类设计与应用

最新推荐文章于 2018-06-20 11:28:01 发布

原创最新推荐文章于 2018-06-20 11:28:01 发布 · 733 阅读

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一、one to one，从表主键引用主表主键

主表实体：

@Entity
@Table(name="EMPLOYEE")
public class Employee {
 
    @Id
    @GeneratedValue
    @Column(name="employee_id")
    private Long employeeId;
     
    @Column(name="name")
    private String name;
 
    @OneToOne(mappedBy="employee", cascade=CascadeType.ALL)
    private EmployeeDetail employeeDetail;
     
    public Employee() {
         
    }
 
    // Getter and Setter methods
}

从表实体：

@Entity
@Table(name="EMPLOYEEDETAIL")
public class EmployeeDetail {
     
    @Id
    @Column(name="employee_id", unique=true, nullable=false)
    @GeneratedValue(generator="gen")
    @GenericGenerator(name="gen", strategy="foreign", parameters=@Parameter(name="property", value="employee"))
    private Long employeeId;
     
    @Column(name="street")
    private String street;
     
    @OneToOne
    @PrimaryKeyJoinColumn
    private Employee employee;
 
    public EmployeeDetail() {
 
    }
 
    // Getter and Setter methods
}

注意：设定mappedBy的那一方不进行主表到从表关系的维护，即对employee的更改，不会影响到employeedetail。