2009.11.24——Hibernate(5) Annotations注解之@onttoone
别的也不说了,就看下我写的例子吧,以Car和License
数据库建表:
create table car
( cid number(7) primary key,
carName varchar2(20) not null
);
create table license
( lid number(7) primary key,
licenseNumber varchar2(10) not null,
licenseColor varchar2(10) not null,
cid number(7) references car(cid)
);
insert into car values(1,'宝马');
insert into car values(2,'奔驰');
insert into car values(3,'奇瑞');
insert into car values(4,'法拉利');
insert into license values(1,'888888','黑色',1);
insert into license values(2,'111111','红色',2);
insert into license values(3,'222222','白色',3);
insert into license(lid,licenseNumber,licenseColor) values(4,'666666','蓝色');
程序
Car.java
@Entity
@Table
public class Car {
private Integer cid;
private String CarName;
private License license;//双向有,单向没有
@Id
@SequenceGenerator
(name="car_seq",sequenceName="car_seq",initialValue=5,allocationSize=1)
@GeneratedValue(strategy=GenerationType.SEQUENCE,generator="car_seq")
public Integer getCid() {
return cid;
}
public void setCid(Integer cid) {
this.cid = cid;
}
public String getCarName() {
return CarName;
}
public void setCarName(String carName) {
CarName = carName;
}
@OneToOne(cascade={CascadeType.ALL},mappedBy="car")//双向的有,单向的就没有了
public License getLicense() {
return license;
}
public void setLicense(License license) {
this.license = license;
}
//关系属性的操作
public void addLicense(License license){
this.license = license;
this.license.addCar(this);
}
public void removeLicense(){
this.license.removeCar();
this.license = null;
}
}
License.java
@Entity
@Table
public class License {
private Integer lid;
private String licenseNumber;
private String licenseColor;
private Car car;
@Id
@SequenceGenerator
(name="license_seq",sequenceName="license_seq",initialValue=4,allocationSize=1)
@GeneratedValue(strategy=GenerationType.SEQUENCE,generator="license_seq")
public Integer getLid() {
return lid;
}
public void setLid(Integer lid) {
this.lid = lid;
}
public String getLicenseNumber() {
return licenseNumber;
}
public void setLicenseNumber(String licenseNumber) {
this.licenseNumber = licenseNumber;
}
public String getLicenseColor() {
return licenseColor;
}
public void setLicenseColor(String licenseColor) {
this.licenseColor = licenseColor;
}
@OneToOne(cascade={CascadeType.ALL})
@JoinColumn(name="cid")
public Car getCar() {
return car;
}
public void setCar(Car car) {
this.car = car;
}
//关系属性的操作
public void addCar(Car car){
this.car = car;
}
public void removeCar(){
this.car = null;
}
}
spring的配置文件
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="annotatedClasses">
<list>
<value>com.huitu.khms.pojo.Car</value>
<value>com.huitu.khms.pojo.License</value>
</list>
</property>
双向的就可以级联了:
Car car = new Car();
car.setCarName("宾利");
License license = new License();
license.setLicenseColor("白色");
license.setLicenseNumber("666666");
car.addLicense(license);//注意是addLicense 而不是setLicense
cas.saveCar(car);
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