Java利用hibernate进行一对多查询时，把另一张表作为一个属性存进这张表的字段中，返回的类型是set类型，要对返回的set类型进行排序
user表
package onlyfun.caterpillar;
public class User {
private Long id;
private String name;
public User() {}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
room表：
package onlyfun.caterpillar;
import java.util.Set;
public class Room {
private Long id;
private String address;
private Set<User> users = new HashSet<User>();
private List<User> user;
public Room() {}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public Set getUsers() {
return users;
}
public void setUsers(Set users) {
this.users = users;
}
@Transient
public List<User> getUser() {
user= new ArrayList<User>(users);
Collections.sort(user, new Comparator<User>() {
@Override
public int compare(User o1, User o2) {
return o1.getId()<o2.getId() ? -1 :1;
}
});
return user;
}
public void setUser(List<User> user) {
this.user= user;
}
}
在room实体中加一个List<User>用来装将Set按照自己的想法排序之后的结果在使用的地方直接取List里面的值即可。
把private Set<User> users = new HashSet<User>();查询出来的数据放到List<User>