JPA：使用复合键的多个一对多关系

Question

我有这些实体：

Run实体：

@Entity
@Table(name = "run")
@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, 
property = "runId")
public class Run implements Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "run_id")
    private Long runId;

    @Column(name = "status")
    private Integer status;

    @Column(name = "create_date")
    private Date date;

    @Column(name = "config_id")
    private Long configId;

    @Column(name = "stream_id")
    private Long streamId;

    @OneToOne(mappedBy = "run", cascade = CascadeType.ALL, orphanRemoval = true)
    @JoinColumn(name = "run_id", unique = true, nullable = true, insertable = true, updatable = true)
    private StreamRun streamRun;
    ...
}

和StreamRun实体：

@Entity
@Table(name = "stream_run")
@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, 
property = "streamId")
public class StreamRun implements Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    @Id
    @Column(name = "id")
    private Long streamId;

    @Column(name = "run_id", insertable = false, updatable = false)
    private Long runId;

    @Column(name = "stream_name")
    private String streamName;

    @OneToOne
    @JoinColumn(name = "run_id")
    private Run run;

    @OneToMany(cascade = CascadeType.ALL, mappedBy = "stream", orphanRemoval = true, targetEntity = JobRun.class)
    private List<JobRun> jobs = new ArrayList<>();

    @OneToMany(cascade = CascadeType.ALL, mappedBy = "streamRun", orphanRemoval = true, targetEntity = StreamEvent.class)
    private List<StreamEvent> events = new ArrayList<>();

    ....
    }

和JobRun实体：

    @Entity
    @Table(name = "jobs_run")
    @JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, 
    property = "id")
    @IdClass(JobRunKey.class)
    public class JobRun implements Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    @Id
    @Column(name = "id")
    private Long id;

    @Id
    @Column(name = "run_id", insertable = false, updatable = false)
    private Long runId;

    @Column(name = "name")
    private String name;

    @Column(name = "type")
    private String jobType;

    @Column(name = "script")
    private String script;

    @Column(name = "status")
    private Integer status;

    @ManyToOne
    @JoinColumns({ @JoinColumn(name = "run_id", referencedColumnName = "run_id"), @JoinColumn(name = "job_stream_id", referencedColumnName = "id") })
    private StreamRun stream;

    @OneToMany(cascade = CascadeType.ALL, mappedBy = "jobRun", orphanRemoval = true, targetEntity = JobDependencyRun.class)
    public List<JobDependencyRun> dependencies = new ArrayList<>();

    @OneToMany(cascade = CascadeType.ALL, mappedBy = "jobRun", orphanRemoval = true, targetEntity = JobEvent.class)
    public List<JobEvent> events = new ArrayList<>();

    ....
}

所有列都定义在 MySQL 数据库中，表job_run 的组合键为（id 和run_id）。

问题出在JobRun实体：

• 如果我将“run_id”字段定义为@ID，则会出现异常（插入时）

  参数索引超出范围（8>参数个数，即7）。

• 如果我在没有@ID 的情况下定义它，则会出现异常（更新时）

  键“PRIMARY”的重复条目“4-78”

• 如果我从实体中删除整个字段定义，因为它是外键，那么例外情况是：

  找不到逻辑名称为run_id的列​​

  “虽然该列存在于表中”。

请问，谁能帮帮我？
我在代码中做错了吗？

Answer 1

我设法找到了解决方案，通过如下修改JobRun 实体，并从直接setter 和getter 方法更改\访问runId 的值。

@Entity
@Table(name = "jobs_run")
@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, 
property = "id")
@IdClass(JobRunKey.class)
public class JobRun implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @Column(name = "id")
    private Long id;

    @Id
    @Column(name = "run_id")
    private Long runId;

    @Column(name = "job_stream_id")
    private Long streamId;

    @Column(name = "name")
    private String name;

    @Column(name = "type")
    private String jobType;

    @Column(name = "script")
    private String script;

    @Column(name = "status")
    private Integer status;

    @ManyToOne
    @JoinColumns({ @JoinColumn(name = "run_id", referencedColumnName = "run_id", insertable = false, updatable = false),
            @JoinColumn(name = "job_stream_id", referencedColumnName = "id", insertable = false, updatable = false) })
    private StreamRun stream;

    @OneToMany(cascade = CascadeType.ALL, mappedBy = "jobRun", orphanRemoval = true, targetEntity = JobDependencyRun.class)
    public List<JobDependencyRun> dependencies = new ArrayList<>();

    @OneToMany(cascade = CascadeType.ALL, mappedBy = "jobRun", orphanRemoval = true, targetEntity = JobEvent.class)
    public List<JobEvent> events = new ArrayList<>();
    ...
}