通过 JDBC 语句执行 DDL "alter table add constraint foreign key () references (id)" 时出错

Question

Error executing DDL "alter table child add constraint foreign key (parent_id) references (id)" via JDBC Statement caused by Failed to add the foreign key constraint.引用的 table ''

中缺少约束 '' 的索引

造成的添加外键约束失败。引用的 table ''

中缺少约束 '' 的索引

下面是我的实体class

@Entity
@Table(name = "parent")
public class Parent {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @OneToMany(mappedBy = "parent", cascade = { CascadeType.PERSIST,
            CascadeType.MERGE }, fetch = FetchType.EAGER, orphanRemoval = true)
    @Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
    private Set<Child> child = new HashSet<>();

下面是 manytoOneampping

的另一个实体 class

@Entity
@Table(name = "child")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class Child implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @ManyToOne
    @JoinColumn(name = "parent_id")
    @JsonIgnoreProperties("child")
    private Parent parent;

Answer 1

我注意到在数据库中，正在创建重复的表，这就是我收到该错误的原因

添加以下注释解决了我的问题：

@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)

通过 JDBC 语句执行 DDL "alter table add constraint foreign key () references (id)" 时出错

Error executing DDL "alter table add constraint foreign key () references (id)" via JDBC Statement

mysql

foreign-keys

one-to-many

many-to-one