@RestController
public class TopicController {
@Autowired
private TopicService topicService;
@RequestMapping(value="/topics", method= RequestMethod.GET)
public List<Topic> getAllTopics(){
return topicService.getAllTopics();
}
@RequestMapping(value="/topics/{id}", method= RequestMethod.GET)
public Topic getTopic(@PathVariable String id){
return topicService.getTopic(id);
}
@RequestMapping(value="/topics", method= RequestMethod.POST)
public void addTopic(@RequestBody Topic topic){
topicService.addTopic(topic);
}
@RequestMapping(value="/topics/{id}", method= RequestMethod.PUT)
public void updateTopic(@RequestBody Topic topic, @PathVariable String id){
topicService.updateTopic(id, topic);
}
@RequestMapping(value="/topics/{id}", method= RequestMethod.DELETE)
public void deleteTopic(@PathVariable String id){
topicService.deleteTopic(id);
}
}
Controller 类
@Service
public class TopicService {
@Autowired
private TopicRepository topicRepo;
public List<Topic> getAllTopics(){
return (List<Topic>)topicRepo.findAll();
}
public Topic getTopic(String id){
return topicRepo.findOne(id);
}
public void addTopic(Topic topic){
//topics.add(topic);
topicRepo.save(topic);
}
public void updateTopic(String id, Topic topic) {
topicRepo.save(topic);
}
public void deleteTopic(String id) {
//topics.removeIf(t -> t.getId().equals(id));
//topics.removeIf((Topic t) -> t.getId().equals(id));
topicRepo.delete(id);
}
}
服务等级
@Repository
public interface TopicRepository extends CrudRepository<Topic, String>{
//List<Course> findByTopic_Id(String topicid);
}
存储库类
@Entity
public class Topic {
@Id
@Column(name="TOPIC_ID")
private String id;
@Column(name="NAME")
private String name;
@Column(name="DESCRIPTION")
private String description;
@OneToMany(mappedBy="topic", fetch = FetchType.EAGER)
@JsonManagedReference
private List<Course> course = new ArrayList<Course>();
//no - argument constructor. Needed for hibernate
public Topic(){};
public Topic(String id, String name, String description, List<Course> course){
super();
this.id = id;
this.name = name;
this.description = description;
this.course = course;
}
public Topic(String id, String name, String description){
super();
this.id = id;
this.name = name;
this.description = description;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public List<Course> getCourse() {
return course;
}
public void setCourse(List<Course> course) {
this.course = course;
}
}
主题类
@Entity
public class Course{
@Id
@Column(name="COURSE_ID")
private String id;
private String name;
private String description;
//There could be many courses related to 1 topic
@ManyToOne
@JoinColumn(name = "TOPIC_ID")
@JsonBackReference
private Topic topic;
public Course(){};
public Course(String id, String name, String description){
super();
this.id = id;
this.name = name;
this.description = description;
}
public Topic getTopic() {
return topic;
}
public void setTopic(Topic topic) {
this.topic = topic;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
}
类(class)类别
我正在尝试使用 Postman 将包含许多类(class)的主题类发布到我的 SQL 数据库中。
在 Postman 中,我像这样使用 JSON 进行 POST
{
"id": "700",
"name": "How to countt",
"description": "Counting numbersssss",
"course": [
{
"id": "1",
"name": "php",
"description": "gooddddyyyy stuff"
},
{
"id": "2",
"name": "phpp",
"description": "gooddddyyyy stuffp"
}
]
}
但是,当我执行相应的获取所有主题时,我的回应是
{
"id": "700",
"name": "How to countt",
"description": "Counting numbersssss",
"course": []
}
它没有获取我发布的类(class)。一个主题可以有多个类(class)。我该如何解决?谢谢
最佳答案
您从未设置双向关联的拥有方:Course.topic
。
并且Topic.courses
上没有设置级联。
因此,保存主题不仅不会保存其类(class),而且即使保存了,类(class)也不会属于其主题。
关于java - 发布 spring boot 的项目列表,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/43830080/