Hibernate处理没有主键的视图

1. 视图的详情

SELECT TEST_FLIGHT_TIME AS TESTTIME,JIHAO AS JIHAO,'1' AS TYPE,FP_ID,REF_ID FROM S_FLIGHT_PLAN -- 1:主机检查时间

UNION

SELECT INSPECT_TIME AS TESTTIME,JIHAO AS JIHAO,'2' AS TYPE,FP_ID,REF_ID FROM S_FLIGHT_PLAN -- 2:主机试飞时间

UNION

SELECT TEST_FLIGHT_TIME1 AS TESTTIME,STANDBY_PLANE AS JIHAO,'3' AS TYPE,FP_ID,REF_ID FROM S_FLIGHT_PLAN -- 3:备份机检查时间

UNION

SELECT INSPECT_TIME1 AS TESTTIME,STANDBY_PLANE AS JIHAO,'4' AS TYPE,FP_ID,REF_ID FROM S_FLIGHT_PLAN -- 4:备份机试飞时间 -- 试飞时间,试飞机号,试飞类型,飞行任务id,派遣任务id

a) 本视图中使用了TSETTIME,JIHAO,TYPE,FP_ID,REF_ID五个字段,由于每个字段都不是唯一的,所以没有主键

1. 由于hibernate处理所有数据,基本都是要有主键的,所以在按创建实体类的时候,会有麻烦,有了下边的解决方法.
2. 新建一个主键类,用几个属性作为联合主键,用@Embeddable注解修饰,将几个属性放入进来,写入get,set方法,并且重写equals()和hashCode()方法.

@Embeddable
public class VTestFlightKey implements Serializable {

private static final long serialVersionUID = 1L;

private Date TESTTIME;

/**

JIHAO 机号 /
private String JIHAO;
/*
TYPE */

private String TYPE;

/*
FP_ID 飞行计划id */

private String FP_ID;
private String REF_ID;

public String getREF_ID() {
return REF_ID;
}

public void setREF_ID(String rEF_ID) {
REF_ID = rEF_ID;
}

public String getFpid() {
return FP_ID;
}

public void setFpid(String fpid) {
this.FP_ID = fpid;
}

public Date getTestTime(){
return TESTTIME;
}

public void setTestTime(Date testTime){
this.TESTTIME=testTime;
}

public String getJihao(){
return JIHAO;
}

public void setJihao(String jihao){
this.JIHAO=jihao;
}

public String getType(){
return TYPE;
}

public void setType(String type){
this.TYPE=type;
}
@Override
public int hashCode() {
return this.TESTTIME.hashCode();
}

@Override
public boolean equals(Object o) {
if(o instanceof VTestFlightKey){
VTestFlightKey key = (VTestFlightKey)o ;
if(this.TESTTIME.equals(key.getTestTime()) && this.JIHAO.equals(key.getJihao()) &&
this.TYPE.equals(key.getType()) && this.FP_ID.equals(key.getFpid()) &&
this.REF_ID.equals(key.getREF_ID())){
return true ;
}
}
return false ;
}
}

将主键类,作为主类的ID属性,并用@Id注解修饰,且主键类中已经用来做联合主键的属性,不再写在主类中,

@Entity

@Table(name="V_TEST_FLIGHT")

public class VTestFlight{

    private static final long serialVersionUID = 1L; //由于所有字段用用来做联合主键,所以字段都在主键类VTestFlightKey

    @Id

    private VTestFlightKey vTestFlightKey;

    public VTestFlightKey getvTestFlightKey() {

            return vTestFlightKey;

    }

    public void setvTestFlightKey(VTestFlightKey vTestFlightKey) {

         this.vTestFlightKey = vTestFlightKey;

    }

}