hibernate 表继承删除和查询问题
无罪释放 2014-02-26 10:26:41 父类:
@Entity
@Inheritance(strategy=InheritanceType.JOINED)
@Table(name = "a", schema = "")
public class Expert{
/** id */
private String id;
/** 名字 */
private String name;
@Id
@GeneratedValue(generator = "paymentableGenerator")
@GenericGenerator(name = "paymentableGenerator", strategy = "uuid")
@Column(name = "ID")
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
@Column(name = "NAME")
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
子类:
@Entity
@Table(name = "b", schema = "")
@PrimaryKeyJoinColumn(name="id")
@Lazy
public class ExpertChild extends Expert{
private String sex;
@Column(name = "sex")
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
}
现在的问题就是查询父类的时候不需要left join 子表,因为子表很多,效率就会很慢?
大侠们,如何解决呢?