mysql - Hibernate不创建连接表

Question

我遇到了一个以前从未发生过的问题。我有 ManyToMany 关系，Hibernate 不创建连接表。它仅创建实体表。我正在将 SpringDataJpa 与 MySQL 结合使用。

医生实体:

Entity
@Table(name = "doctors")
public class Doctor {
  @Id
  @Size(min = 11, max = 11)
  @NotNull
  private String pesel;

  @NotNull
  private String firstName;

  @NotNull
  private String lastName;

  private Long salary;

  @NotNull
  private String speciality;

  @OneToOne
  private Doctor supervisor;

  @ManyToMany
  @JoinTable(name = "doctors_treatments",
          joinColumns = @JoinColumn(name = "pesel", referencedColumnName = "pesel"),
          inverseJoinColumns = @JoinColumn(name = "treatment_id", referencedColumnName = "id"))
  private Set<Treatment> treatments;
}

治疗实体:

@Table(name = "treatments")
public class Treatment {
  @Id
  @GeneratedValue(strategy = GenerationType.AUTO)
  private Long id;

  @NotNull
  private String name;

  private Long cost;

  @ManyToMany(mappedBy = "treatments")
  private Set<Doctor> doctors; 
}

application.properties:

spring.jpa.hibernate.ddl-auto=create
spring.datasource.url=jdbc:mysql://localhost:33061/sys

堆栈跟踪:

  org.hibernate.tool.schema.spi.CommandAcceptanceException: Error executing DDL via JDBC Statement
    ...
    Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'sys.doctors_treatments' doesn't exist

有什么想法可能是什么原因吗？

Answer 1

事实证明，Hibernate 没有创建连接表，因为 Doctors 主键扩展了允许的大小。然而，它能够单独创建Doctors表。因此，为了解决这个问题，我必须限制 id 大小。我已经更改了Doctors id，如下所示:

@Id
@Column(length = 11)
@NotNull
private String pesel;

现在 Hibernate 可以创建连接表了。