Java Hibernate在尝试删除多个关系中的实体时引发异常
Java Hibernate在尝试删除多个关系中的实体时引发异常,java,spring,hibernate,Java,Spring,Hibernate,Team和TeamMember有很多关系。当我试图像这样删除团队时: public void deleteTeam(int id) { Team team = (Team) getCurrentSession().get(Team.class, id); getCurrentSession().delete(team); } 它给出了: org.springframework.dao.InvalidDataAccessApiUsageException: del
Team
和TeamMember
有很多关系。当我试图像这样删除团队时:
public void deleteTeam(int id) {
Team team = (Team) getCurrentSession().get(Team.class, id);
getCurrentSession().delete(team);
}
它给出了:
org.springframework.dao.InvalidDataAccessApiUsageException: deleted object would be re-saved by cascade (remove deleted object from associations): [com.sprhib.model.Team#1];
nested exception is org.hibernate.ObjectDeletedException: deleted object would be re-saved by cascade (remove deleted object from associations): [com.sprhib.model.Team#1]
然后,我尝试从持有我需要删除的团队的团队成员实体中删除所有团队:
public void deleteTeam(int id) {
Team team = getTeam(id);
if(team != null){
for(TeamMember tm: team.getTeamMembers()){
for(Team t: tm.getTeams()){
if(t.getId() == team.getId()){
tm.getTeams().remove(t);
}
}
}
getCurrentSession().delete(team);
}
}
但同样的错误依然存在。首先,我希望Hibernate能够相应地管理许多关系中的所有相关实体,因为它们都有注释。但它拒绝工作。WTF
团队
@Entity
@Table(name="teams")
public class Team {
private int id;
private String name;
private int rating;
private Set<TeamMember> teamMembers;
private Organization organization;
@Id
@NotNull
@GeneratedValue(strategy = GenerationType.AUTO)
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Length(max = 45)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@NotNull
@Range(min = 0,max = 10)
public int getRating() {
return rating;
}
public void setRating(int rating) {
this.rating = rating;
}
@NotNull
@ManyToOne(fetch = FetchType.EAGER, cascade = {CascadeType.MERGE})
@JoinColumn(name = "FK_Organization_id", nullable = false)
public Organization getOrganization() {
return organization;
}
public void setOrganization(Organization organization) {
this.organization = organization;
}
@ManyToMany(fetch = FetchType.EAGER, cascade = {CascadeType.ALL})
@JoinTable(name = "team_member", joinColumns =
@JoinColumn(name = "FK_Team_id", referencedColumnName= "id"),
inverseJoinColumns = @JoinColumn(name = "FK_Member_id", referencedColumnName = "id")
)
public Set<TeamMember> getTeamMembers() {
return teamMembers;
}
public void setTeamMembers(Set<TeamMember> teamMembers) {
this.teamMembers = teamMembers;
}
}
@实体
@表(name=“teams”)
公开课小组{
私有int-id;
私有字符串名称;
私人内部评级;
私人团队成员;
私人组织;
@身份证
@NotNull
@GeneratedValue(策略=GenerationType.AUTO)
公共int getId(){
返回id;
}
公共无效集合id(内部id){
this.id=id;
}
@长度(最大值=45)
公共字符串getName(){
返回名称;
}
公共void集合名(字符串名){
this.name=名称;
}
@NotNull
@范围(最小值=0,最大值=10)
public int getRating(){
回报率;
}
公共评级(内部评级){
这个。评级=评级;
}
@NotNull
@manytone(fetch=FetchType.EAGER,cascade={CascadeType.MERGE})
@JoinColumn(name=“FK\u Organization\u id”,null=false)
公共组织{
返回组织;
}
公共组织(组织){
这个组织=组织;
}
@ManyToMany(fetch=FetchType.EAGER,cascade={CascadeType.ALL})
@JoinTable(name=“团队成员”,JointColumns=
@JoinColumn(name=“FK\u Team\u id”,referencedColumnName=“id”),
inverseJoinColumns=@JoinColumn(name=“FK\u Member\u id”,referencedColumnName=“id”)
)
公共集getTeamMembers(){
返回团队成员;
}
公共无效设置成员(设置团队成员){
this.teamMembers=团队成员;
}
}
团队成员
@Entity
@Table(name="member")
public class TeamMember {
private int id;
private String name;
private Set<Team> teams;
@Id
@NotNull
@GeneratedValue(strategy = GenerationType.AUTO)
public int getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
@NotEmpty
@Length(max=100)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@NotNull
@ManyToMany(fetch = FetchType.EAGER, mappedBy = "teamMembers", cascade = {CascadeType.MERGE, CascadeType.PERSIST, CascadeType.REFRESH, CascadeType.REMOVE}) // cascade!!!
public Set<Team> getTeams(){
return teams;
}
public void setTeams(Set<Team> teams) {
this.teams = teams;
}
}
@实体
@表(name=“member”)
公开课小组成员{
私有int-id;
私有字符串名称;
私人团队;
@身份证
@NotNull
@GeneratedValue(策略=GenerationType.AUTO)
公共int getId(){
返回id;
}
公共无效集合id(整数id){
this.id=id;
}
@空空如也
@长度(最大值=100)
公共字符串getName(){
返回名称;
}
公共void集合名(字符串名){
this.name=名称;
}
@NotNull
@ManyToMany(fetch=FetchType.EAGER,mappedBy=“teamMembers”,cascade={CascadeType.MERGE,CascadeType.PERSIST,CascadeType.REFRESH,CascadeType.REMOVE})//cascade!!!
公共集getTeams(){
返回队;
}
公共队(集合队){
这个。团队=团队;
}
}
删除不应与JPA 2.0规范中的@ManyToMany一起使用
关系建模注释限制cascade=REMOVE规范的使用。cascade=REMOVE规范应仅适用于指定为OneToOne或OneToMany的关联。将cascade=REMOVE应用于其他关联的应用程序是不可移植的
Hibernate中有供应商扩展@OnDelete:
@OnDelete(action=OnDeleteAction.CASCADE)但是从团队中删除团队成员意味着什么?它应该解除TeamMemeber与团队的关联,还是确实要删除该团队成员?也许JPA/Hibernate对这种模糊性感到困惑