Spring boot 我想将POST请求中的数据保存到表中_Spring Boot_Spring Data Jpa

Spring boot 我想将POST请求中的数据保存到表中

spring-boot

Spring boot 我想将POST请求中的数据保存到表中,spring-boot,spring-data-jpa,Spring Boot,Spring Data Jpa,我正在从POST请求中检索数据并保存到UserSubjects表。我刚保存时还可以，在实体中它是“private Integer subjectId” 用户主题 +-----------+---------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-----------+---------+------+-----+-----

我正在从POST请求中检索数据并保存到UserSubjects表。我刚保存时还可以，在实体中它是“private Integer subjectId”

用户主题

+-----------+---------+------+-----+---------+----------------+
| Field     | Type    | Null | Key | Default | Extra          |
+-----------+---------+------+-----+---------+----------------+
| id        | int(20) | NO   | PRI | NULL    | auto_increment |
| subjectId | int(11) | YES  | MUL | NULL    |                |
| userId    | int(11) | YES  |     | NULL    |                |
+-----------+---------+------+-----+---------+----------------+

UserSubjectsEntity.java

@Entity
@Table(name = "userSubjects")
public class UserSubjects {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    private Integer id;

    @OneToOne
    @JoinColumn(name="subjectId", referencedColumnName = "id")
    private Subjects subjects;

    @Column(name = "userId")
    private Integer userId;

    public UserSubjects(Integer id, Subjects subjects, Integer userId) {
        this.id = id;
        this.subjects = subjects;
        this.userId = userId;
    }

    public UserSubjects() {
    }

    // getters and setters..

public interface UserSubjectsRepository extends JpaRepository<UserSubjects, Integer> {
    List<UserSubjects> findAllSubjectsByUserId(Integer userId);
}

@Service
public class UserSubjectsService {
    @Autowired
    UserSubjectsRepository userSubjectsRepository;

    // Save subjects in UserSubjects repository
    public UserSubjects saveUserSubjects(Integer subjectId, Integer userId, UserSubjects userSubjects) {
        userSubjects.setSubjectId(subjectId);
        userSubjects.setUserId(userId);
        return userSubjectsRepository.save(userSubjects);
    }

    // Get all subjects that have current user
    public List<UserSubjects> getAllSubjects(Integer userId) {
        return userSubjectsRepository.findAllSubjectsByUserId(userId);
    }
}

@RestController
public class CourseRegistrationController {
    @Autowired
    UserSubjectsService userSubjectsService;

    // Post request for adding subjects to userSubject table
    @RequestMapping(value = "courses/registration", method = RequestMethod.POST)
    public UserSubjects addUserSubjects(@AuthenticationPrincipal MyUserDetails myUserDetails,
                                        @RequestBody UserSubjects userSubjects) {
        return userSubjectsService.saveUserSubjects(userSubjects.getSubjectId(), myUserDetails.getId(), userSubjects);
    }

    // Get all subjects of user
    @RequestMapping(value = "courses/show", method = RequestMethod.GET)
    public List<UserSubjects> getAllSubjectsOfUser(@AuthenticationPrincipal MyUserDetails myUserDetails) {
        return userSubjectsService.getAllSubjects(myUserDetails.getId());
    }
}

@Entity
@Table(name = "subjects")
public class Subjects {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    private Integer id;

    @Column(name = "title", length = 255)
    private String title;

    @Column(name = "codeSub", length = 255)
    private String codeSub;

    @ManyToOne
    @JoinColumn(name="facultyId", referencedColumnName = "id")
    private Faculty faculty;

    @ManyToOne
    @JoinColumn(name="departmentId", referencedColumnName = "id")
    private Departments departments;

    @Column(name = "ects")
    private String ects;

    @Column(name = "lc")
    private String lc;

    public Subjects(Integer id, String title, String codeSub, Faculty faculty, Departments departments, String ects, String lc) {
        this.id = id;
        this.title = title;
        this.codeSub = codeSub;
        this.faculty = faculty;
        this.departments = departments;
        this.ects = ects;
        this.lc = lc;
    }

    public Subjects() {
    }

    // gettters and setters..

但是在我想要检索表中的数据之后，我遇到了这个问题。我不仅想得到subjectId，还想得到subjects表中与subjectId对应的所有数据

UserSubjectsRepository.java

@Entity
@Table(name = "userSubjects")
public class UserSubjects {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    private Integer id;

    @OneToOne
    @JoinColumn(name="subjectId", referencedColumnName = "id")
    private Subjects subjects;

    @Column(name = "userId")
    private Integer userId;

    public UserSubjects(Integer id, Subjects subjects, Integer userId) {
        this.id = id;
        this.subjects = subjects;
        this.userId = userId;
    }

    public UserSubjects() {
    }

    // getters and setters..

public interface UserSubjectsRepository extends JpaRepository<UserSubjects, Integer> {
    List<UserSubjects> findAllSubjectsByUserId(Integer userId);
}

@Service
public class UserSubjectsService {
    @Autowired
    UserSubjectsRepository userSubjectsRepository;

    // Save subjects in UserSubjects repository
    public UserSubjects saveUserSubjects(Integer subjectId, Integer userId, UserSubjects userSubjects) {
        userSubjects.setSubjectId(subjectId);
        userSubjects.setUserId(userId);
        return userSubjectsRepository.save(userSubjects);
    }

    // Get all subjects that have current user
    public List<UserSubjects> getAllSubjects(Integer userId) {
        return userSubjectsRepository.findAllSubjectsByUserId(userId);
    }
}

@RestController
public class CourseRegistrationController {
    @Autowired
    UserSubjectsService userSubjectsService;

    // Post request for adding subjects to userSubject table
    @RequestMapping(value = "courses/registration", method = RequestMethod.POST)
    public UserSubjects addUserSubjects(@AuthenticationPrincipal MyUserDetails myUserDetails,
                                        @RequestBody UserSubjects userSubjects) {
        return userSubjectsService.saveUserSubjects(userSubjects.getSubjectId(), myUserDetails.getId(), userSubjects);
    }

    // Get all subjects of user
    @RequestMapping(value = "courses/show", method = RequestMethod.GET)
    public List<UserSubjects> getAllSubjectsOfUser(@AuthenticationPrincipal MyUserDetails myUserDetails) {
        return userSubjectsService.getAllSubjects(myUserDetails.getId());
    }
}

@Entity
@Table(name = "subjects")
public class Subjects {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    private Integer id;

    @Column(name = "title", length = 255)
    private String title;

    @Column(name = "codeSub", length = 255)
    private String codeSub;

    @ManyToOne
    @JoinColumn(name="facultyId", referencedColumnName = "id")
    private Faculty faculty;

    @ManyToOne
    @JoinColumn(name="departmentId", referencedColumnName = "id")
    private Departments departments;

    @Column(name = "ects")
    private String ects;

    @Column(name = "lc")
    private String lc;

    public Subjects(Integer id, String title, String codeSub, Faculty faculty, Departments departments, String ects, String lc) {
        this.id = id;
        this.title = title;
        this.codeSub = codeSub;
        this.faculty = faculty;
        this.departments = departments;
        this.ects = ects;
        this.lc = lc;
    }

    public Subjects() {
    }

    // gettters and setters..

邮递员的邮寄请求

{
    "subjectId":"2"
}

有没有另一种方法可以保存POST请求中的Jpa数据？

您应该通过

subjectId

找到

Subject

，并将其设置为

UserSubjects

，而不是直接从POST正文中设置

Integer subjects

要实现这一点，您需要：

为您的POST请求正文创建一个单独的文本：

公共最终类AddUserSubjectsRequest{
私有整数主语；
公共整数getSubjectId（）{
回归主体；
}
public void setSubjectId（整数subjectId）{
this.subjectId=主观性；
}
}

在控制器中使用新创建的

AddUserSubjectsRequest

（了解更多信息）：

@RequestMapping（value=“课程/注册”，method=RequestMethod.POST）
公共用户主题addUserSubjects(
@AuthenticationPrincipal MyUserDetails MyUserDetails，
@RequestBody AddUserSubjectsRequest请求
) {
返回userSubjectsService.saveUserSubjects（request.getSubjectId（），myUserDetails.getId（））；
}

创建

SubjectsRepository

如果您还没有：

公共接口SubjectsRepository扩展了JpaRepository{}

将其注入到

UserSubjectsService

：

@服务
公共类UserSubjectsService{
@自动连线
用户主体假设用户主体假设；
@自动连线
主语否定主语否定；
//方法保持完整
}

修改

usersubjects服务。保存usersubjects

方法：

public UserSubjects saveUserSubjects（整数subjectId，整数userId）{
最终用户主题用户主题=新用户主题（）；
userSubjects.setSubject（subjectsRepository.getOne（subjectId））；
userSubjects.setUserId（userId）；
返回userSubjectsRepository.save（userSubjects）；
}

注意：从现在起，您应该处理无法找到

主题的情况。当来自POST请求的subjects
表中缺少subjectId
时，可能会发生这种情况。
您是否也可以添加subjects
实体类？以及您发送到应用程序的POST请求。我已经添加了主题实体和POST请求。我不清楚如何userSubjects.setSubjectId（subjectId）可以设置吗？UserSubjects
中没有属性Integer subjectId
，只有Subjects Subjects
。是的，我已将此字段更改为Subjects Subjects
，以前它是私有整数subjectId
。然后我必须编写get方法从UserSubjects
表中检索数据，如果我只使用FindAll方法进行检索，它将只检索SujbectId和UserId，而不检索关于这个主题的任何其他信息。所以我知道SubjectId必须有外键，我必须使用JoinColumn来实现它@Maksimiakunin但问题是，我无法将post请求中的数据保存到表中，因为实体中没有私有整数subjectId
，尝试从post请求中保存时，它将返回错误。所以问题是，我是否使用了从POST请求保存数据的错误方法，或者我使用了错误的列。是否有其他获取或保存数据的方法@Maksimiakunii猜你不明白我的意思，我必须使用POST请求方法来获取subjectId
。我正在做的是大学的PMS（个人管理系统）。此时此刻，当学生从可用列表中选择科目时，如果学生选择其中一个科目，我必须检索该科目的id，并使用经过身份验证的用户id将其保存到UserSubject
表中。PS：我有单独的表UserSubjects来保存每个学生的科目列表，即UserSubjects
将包含所有学生的所有科目。如我所见，我正确理解您。你试过我的解决办法吗？要点是您不能仅从POST请求设置原始subjectId
。您应该找到相应的Subject
实体，并将找到的实体设置为UserSubjects
。是的，我已经尝试过了。但问题还是一样，我不能接受POST-request中的subjectID
。哦，那就是你的问题！：）然后我建议您不要直接在控制器中使用UserSubjects实体。只需为此创建一个单独的POJO。我已经相应地更新了我的答案。你能再试一次我的解决方案吗？它很有效，谢谢）但我必须在我的私有主题中添加这些注释@JsonIgnoreProperties（{“HibernateLazInitializer”，“handler”}）
，因为它给了我错误。