java - org.hibernate.MappingException : Repeated column in mapping for entity

我正在做一个简单的投票系统。我有2张 table :
Person:ID，名称，姓氏
Vote:ID，投票( boolean 值)，VoterID(实际上是FK_PersonID)，PersonID(实际上也是FK_PersonID)。

我需要能够确定谁投票给投票的，以及谁投票给投票的-使用存储在Person表中的人员来为和这两个需求投票。表格Person包含可以“投票”以及“被投票”的用户的用户详细信息。人们可以决定是否要为自己投票。

我已经将表映射到我的domain对象中，如下所示:

人

    private Integer ID;
    private String name;
    private String surname;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "ID")
    public Integer getID() {
        return ID;
    }

    public void setID(Integer ID) {
        this.ID = ID;
    }

    @Column(name = "name")
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Column(name = "surname")
    public String getSurname() {
        return surname;
    }

    public void setSurname(String surname) {
        this.surname = surname;
    }

投票

private Integer ID;
private Person voter;
private Person person;
private Boolean vote;

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "ID")
public Integer getID() {
    return ID;
}

public void setID(Integer ID) {
    this.ID = ID;
}

@Column(name = "vote")
   public Boolean getVote() {
    return vote;
}

public void setVote(Boolean vote) {
    this.vote = vote;
}

@ManyToOne
@JoinColumn(name = "personID")
public Person getVoter() {
    return voter;
}

public void setVoter(Person voter) {
    this.voter = voter;
}

@ManyToOne
@JoinColumn(name = "personID")
public Person getPerson() {
    return person;
}

public void setPerson(Person person) {
    this.person = person;
}

错误消息

最佳答案

您对选民和个人使用相同的@JoinColumn。更改为关联人的@JoinColumn("personID")和关联选民的@JoinColumn("voterID")，一切都应该没问题。

附带说明一下，因为您用domain-driven-design标记了它……如果像这样实现，您的表决类将具有更多DDD样式:

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "ID")
private Integer ID;

@ManyToOne
@JoinColumn(name = "voterID")
private Person voter;

@ManyToOne
@JoinColumn(name = "votedForID")
private Person votedFor;

@Column(name = "vote")
private Boolean vote;

public void cast(Person voter, Person votedFor, boolean vote) {
    // Maybe assert that this vote has not already been casted
    this.voter = voter;
    this.votedFor = votedFor;
    this.vote = vote;
}

public Integer getID() {
    return ID;
}

public Boolean isUpVote() {
    return vote;
}

public Boolean isDownVote() {
    return !vote;
}

public Person getVoter() {
    return voter;
}

public Person getVotedFor() {
    return votedFor;
}

只是一个例子，不知道我是否正确理解了您的vote boolean 值的含义，以表示赞成/反对表决。

关于java - org.hibernate.MappingException : Repeated column in mapping for entity，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/12002638/