我有一个奇怪的问题:我正在尝试在我的数据库中保存一个用户,这个用户有一个技能列表。这些技能已经在具有链接类别的数据库中,并且类别具有链接域。结构如下所示:
当我打印申请人的技能列表时,我有这个:
skills=[Skill{categories=[Category{domains=[Domain{id=4, name=DevOps}], id=13, name=BackEnd}], id=23, name=Java}, Skill{categories=[Category{domains=[Domain{id=4, name=DevOps}], id=13, name=BackEnd}], id=24, name=C}],
这是在申请人和技能之间建立联系的表格:
但是当我试图挽救申请人时,我得到了这个 Détail:失败行包含 (23, null, null, 499)。有人可以解释我吗?我正在使用 jpa annotaions 开发一个 spring 应用程序。
编辑 1:
申请人实体:
@Entity
@Table(name = "ATS_APPLICANT")
public class ApplicantEntity implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@Column(name = "home", unique = false, nullable = true)
private Boolean home;
@Column(name = "anonymous", unique = false, nullable = true)
private Boolean anonymous;
@Enumerated(EnumType.STRING)
@Column(name = "job_type")
private JobType jobType;
@Column(name = "min_salary", unique = false, nullable = true)
private Integer minSalary;
@OneToOne(cascade = CascadeType.ALL)
@JoinColumn(unique = true)
private UserEntity user;
@OneToMany(targetEntity = ApplicantWorkExperienceEntity.class, cascade = CascadeType.ALL)
private List<ApplicantWorkExperienceEntity> applicantWorkExperiences = new ArrayList<ApplicantWorkExperienceEntity>();
@ManyToMany(fetch = FetchType.EAGER, cascade = CascadeType.MERGE)
@JoinTable(name = "ATS_APPLICANT_SKILL", joinColumns = @JoinColumn(name = "applicant_id", referencedColumnName = "id"), inverseJoinColumns = @JoinColumn(name = "skill_id", referencedColumnName = "id"))
private List<SkillEntity> skills = new ArrayList<SkillEntity>();
@ManyToMany(cascade = CascadeType.ALL)
@JoinTable(name = "ATS_APPLICANT_LOCATION", joinColumns = @JoinColumn(name = "applicant_id", referencedColumnName = "id"), inverseJoinColumns = @JoinColumn(name = "location_id", referencedColumnName = "id"))
private List<LocationEntity> locations = new ArrayList<LocationEntity>();
技能实体:
@Entity
@Table(name = "ATS_SKILL")
public class SkillEntity implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@NotNull
@Size(min = 1, max = 42)
@Column(name = "name", length = 42, nullable = false, unique = true)
private String name;
@ManyToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
@JoinTable(name = "ATS_SKILL_CATEGORY", joinColumns = @JoinColumn(name = "skill_id", referencedColumnName = "id"), inverseJoinColumns = @JoinColumn(name = "category_id", referencedColumnName = "id"))
private List<CategoryEntity> categories = new ArrayList<CategoryEntity>();
类别实体:
@Entity
@Table(name = "ATS_CATEGORY")
public class CategoryEntity implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@NotNull
@Size(min = 1, max = 42)
@Column(name = "name", length = 42, nullable = false, unique = true)
private String name;
@ManyToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
@JoinTable(name = "ATS_CATEGORY_DOMAIN", joinColumns = @JoinColumn(name = "category_id", referencedColumnName = "id"), inverseJoinColumns = @JoinColumn(name = "domain_id", referencedColumnName = "id"))
private List<DomainEntity> domains = new ArrayList<DomainEntity>();
编辑 2: 域实体:
@Entity
@Table(name = "ATS_DOMAIN")
public class DomainEntity implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@NotNull
@Size(min = 1, max = 42)
@Column(name = "name", length = 42, nullable = false, unique = true)
private String name;
最佳答案
我通过在技能上使用@ElementCollection 注释获得了成功。
关于java - 组织.postgresql.util.PSQLException : ERROR: null value in column "category_id" violates not-null constraint,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45051740/