如何解决Java springboot中的多对多和一对多映射
我有3个要转换为具有关系的表的实体
------用户------
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@ToString
@Entity
@Table(name = "user")
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name="user_Id")
private int userId;
@Column(name="name")
private String name;
@Column(name="lastname")
private String lastname;
@Column(name="email")
private String email;
@Column(name="password")
private String password;
@Column(name="isActive")
private boolean isActive;
@Column(name="lastActive")
private String lastActive;
@Column(name="createdDate")
private String createdDate;
@Column(name="isBlocked")
private boolean isBlocked;
@ManyToOne(fetch = FetchType.LAZY,optional = false)
@JoinColumn(name = "institution_id",nullable = false)
private Institution institution;
@ManyToMany(mappedBy = "users")
private Set<Role> roles;
}
-----角色------
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@ToString
@Entity
@Table(name = "role")
public class Role {
@Id
@GeneratedValue
@Column(name="role_Id")
private int roleId;
@Column(name="name")
private String name;
@Column(name="description")
private String description;
@ManyToMany(cascade = CascadeType.ALL)
@JoinTable
private Set<User> users;
}
-----机构------
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@ToString
@Entity
@Table(name = "institution")
public class Institution {
@Id
@GeneratedValue
@Column(name="institution_Id")
private int institutionId;
@Column(name="name")
private String name;
@Column(name="type")
private String type;
@Column(name="location")
private String location;
@OneToMany(mappedBy = "institution",fetch = FetchType.LAZY)
private Set<User> user;
}
但是当我将项目作为Java应用程序运行时,在mySQL工作台中没有创建任何表(在添加他多对多注释后,它在创建表之前就创建了表,因此发生了错误。)
关于我的代码为什么不起作用的任何想法吗?
这是我的application.properties
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/mydb
spring.datasource.username = root
spring.datasource.password = pass123
spring.jpa.show-sql = true
spring.jpa.hibernate.ddl-auto = update
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
server.port=9090
解决方法
@OneToMany不创建表。 @ManyToMany创建一个表,您必须指定其详细信息,例如:
在用户类别中:
@ManyToMany
@JoinTable(name = "users_roles",joinColumns = { @JoinColumn(name = "user_id") },inverseJoinColumns = { @JoinColumn(name = "role_id") })
private Set<Role> roles;
在角色类别中:
@ManyToMany(mappedBy="roles")
private Set<User> users;
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