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。它只创建实体表。我正在将 SpringDataJpa 与 MySQL 一起使用。

博士实体:

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;
}

处理实体:

@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; 
}

应用程序属性:

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

任何想法可能是什么原因？

Answer 1

事实证明，由于 Doctors 主键扩展了允许的大小，Hibernate 没有创建连接表。但是，它能够单独创建 Doctors 表。所以为了修复它，我不得不限制 id 大小。我已经像这样更改了 Doctors id:

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

现在连接表可以由 Hibernate 创建。