Question

我尽力在数据库事务中发生多次到多次插入语句。这是日志消息

突出显示的文本告诉select select在事务内部启动，但不是在事务提交后发生的insert语句。

我的想法是，我希望查询的所有内容都在事务内部。

这些是我在控制器，存储库和映射中的代码。

控制器动作方法

    @Transactional(readOnly = false,rollbackFor = Exception.class,
            isolation = Isolation.READ_COMMITTED)
    @RequestMapping(value = "/{userId}role", method = RequestMethod.PUT)
    public void AddUserToRole(@PathVariable int userId,
                            @RequestBody  AddUserToRoleRequest request) {
        roleRepository.getCurrentFlushMode();
        User user = userRepository.getUserById(userId);
        Role role = roleRepository.getRoleById(request.getRoleId());
        role.getUsers().add(user);
        user.getRoles().add(role);
    }

RoleRepository

@Repository
public class RoleRepository {

    private static Log log = LogFactory.getLog(RoleRepository.class);
    @PersistenceContext
    EntityManager entityManager;

    public void addRole(Role role) {
        entityManager.persist(role);
    }

    public Role getRoleById(long roleId) {
        Role role = entityManager.find(Role.class, roleId);
        return role;
    }

    public void getCurrentFlushMode() {
        log.info(String.format("current flush mode %s", entityManager.getFlushMode()));
    }


}

UserRepository

@Repository
public class UserRepository {

    @PersistenceContext
    private EntityManager entityManager;

    public  void addUser(User user){
        entityManager.persist(user);
    }

    public  User getUserById(long userId){
     User user =   entityManager.find(User.class,userId);
        return  user;
    }

}

角色实体

@Entity
@Table(name = "roles")
public class Role {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;
    private String name;

    @ManyToMany(fetch = FetchType.LAZY
            //,cascade = {CascadeType.PERSIST, CascadeType.MERGE,}
    )
    @JoinTable(name = "user_roles",
            joinColumns = @JoinColumn(name = "role_id", referencedColumnName = "id"),
            inverseJoinColumns = @JoinColumn(name = "user_id", referencedColumnName = "id"))
    private List<User> users;

    public long getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public List<User> getUsers() {
        return users;
    }

    public void setUsers(List<User> users) {
        this.users = users;
    }
}

用户实体

@Entity
@Table(name = "users")
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;
    private String name;
    private String email;

    @OneToMany(
           // cascade = CascadeType.ALL,
             mappedBy = "user",
            fetch = FetchType.LAZY)
    private List<Post> posts;

    @ManyToMany(mappedBy = "users"
            //, cascade = CascadeType.ALL
    )
    private List<Role> roles;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public long getId() {
        return id;
    }

    public List<Post> getPosts() {
        return posts;
    }

    public void setPosts(List<Post> posts) {
        this.posts = posts;
    }

    public List<Role> getRoles() {
        return roles;
    }

    public void setRoles(List<Role> roles) {
        this.roles = roles;
    }

    public void addRole(Role role) {
        role.getUsers().add(this);
        this.getRoles().add(role);
    }

}

如果我显式调用enityManager.flush（）;此问题按预期在事务内插入语句。 Hower我只是不想显式调用flush因为插入新用户或角色我不需要调用flush并且插入发生在事务begin / commit中。

非常感谢

对于多对多关系，Spring JPA，Hibernate，Springboot，事务内部不会发生Insert语句

0 个答案: