hibernate基于注解的联合主键映射

联合主键映射

//注意，作为联合主键的实体类必须实现Serializable接口
public class AirPort implements Serializable{
private static final long serialVersionUID = 1L;
private String startPort;
private String endPort;
public AirPort() {
super();
// TODO Auto-generated constructor stub
}
@Column(length=10)
public String getStartPort() {
return startPort;
}
public void setStartPort(String startPort) {
this.startPort = startPort;
}
@Column(length=10)
public String getEndPort() {
return endPort;
}
public void setEndPort(String endPort) {
this.endPort = endPort;
}
}

public class AirLine {

private AirPort airPort;
private double length;
private Date day;
public AirLine() {
super();
// TODO Auto-generated constructor stub
}
@EmbeddedId//声明联合主键只需这个注解即可，联合主键具体的属性可以在AirPort类中说明
public AirPort getAirPort() {
return airPort;
}
public void setAirPort(AirPort airPort) {
this.airPort = airPort;
}
@Column(scale=6,precision=2)
public double getLength() {
return length;
}
public void setLength(double length) {
this.length = length;
}
@Temporal(TemporalType.DATE)
public Date getDay() {
return day;
}
public void setDay(Date day) {
this.day = day;
}
}