Question

我遇到了hibernate的问题。（（（

映射（对于getter's / setter，我使用lombok）

User.java

@Entity
@Table(name = "users")
public @Data class User
{

// Base Mapping

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "user_id")
@Getter @Setter Long user_id;   

@Column(name = "user_name")
private @Getter @Setter String user_name;

@Column(name = "login")
private @Getter @Setter String login;

@Column(name = "password")
private @Getter @Setter String password;

// Releations Mapping

// Releations With Project

@ManyToMany(cascade={CascadeType.ALL}) 
@JoinTable(name="users_on_projects",
        joinColumns=@JoinColumn(name="user_id"),
        inverseJoinColumns=@JoinColumn(name="project_id") )
        private @Getter @Setter  List<Project>  projects = new Vector();


@ManyToMany
@JoinTable(name="intervals",
        joinColumns=@JoinColumn(name="users_on_projects_id"),
        inverseJoinColumns=@JoinColumn(name="interval_id") )
        private  @Getter @Setter List<Interval> intervals = new Vector();
}

Project.java

@Entity
@Table(name = "projects")
public @Data class Project
{

// Base Mapping

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name ="project_id")
private @Getter @Setter  Long project_id;

@Column(name ="project_name")
private @Getter @Setter String project_name;


// Releations Mapping

// Releations With User

  @ManyToMany(cascade={CascadeType.ALL}) 
@JoinTable(name="users_on_projects",
        joinColumns=@JoinColumn(name="project_id"),
        inverseJoinColumns=@JoinColumn(name="user_id") )
  private @Getter @Setter  List<User>  users = new Vector();

@OneToMany
@JoinTable(name="intervals",
        joinColumns=@JoinColumn(name="users_on_projects_id"),
        inverseJoinColumns=@JoinColumn(name="interval_id") )
        private  @Getter @Setter List<Interval> intervals = new Vector();
}

Interval.java

@Entity
@Table(name = "intervals")
public class Interval
{
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "interval_id")
@Getter @Setter Long interval_id;

@Column(name ="start_time")
private @Setter @Getter 
            @Temporal(javax.persistence.TemporalType.TIMESTAMP)
            Date start_time;

@Column(name ="finish_time")
private @Setter @Getter 
        @Temporal(javax.persistence.TemporalType.TIMESTAMP)
        Date FinishTime;


@ManyToOne(cascade={CascadeType.ALL}) 
@JoinTable(name="users_on_projects",
        joinColumns=@JoinColumn(name="users_on_projects_id"),
        inverseJoinColumns=@JoinColumn(name="user_id") )
        private  @Getter @Setter User user;


@JoinTable(name="users_on_projects",
        joinColumns=@JoinColumn(name="users_on_projects_id"),
        inverseJoinColumns=@JoinColumn(name="project_id") )
        private  @Getter @Setter 
@ManyToOne
         Project project;


@ManyToOne(cascade = CascadeType.ALL)
@JoinColumn(name="interval_type_id")
private  @Getter @Setter IntervalType intervalType;

}

IntervalType.java

@Entity
@Table(name = "interval_type")
public class IntervalType
{
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "interval_type_id")
@Getter @Setter Long interval_type_id;

@Column(name = "interval_type_name")
private @Getter @Setter String interval_type_name;
}

我可以从任何表中读取任何数据，但不能写入间隔表（（

错误消息是： *字段'users_on_projects_id'没有默认值* 并且hibernate生成这个SQL代码：插入间隔（finish_time，interval_type_id，start_time）值（？，？，？）

映射有什么问题？

Answer 1

你的映射看起来有点奇怪（但我可能理解是错的）。我发现如此奇怪的是两种关系：

用户 - ＆gt;间隔
项目 - ＆gt;间隔

存储在SAME连接表“interval”中，在两种情况下，JoinColumn都是“users_on_projects_id”。

对于我而言，它看起来像是一个副本和过去的错误。

Hibernate：映射问题

1 个答案: