findAll（）返回null

Question

我希望使用findAll()方法获得表users中所有值的列表。

这是我尝试过的：

user.java

package ch.concertopro.webshopanalyser.entity;

import javax.persistence.*;

@Entity(name = "users")
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private int id;
    private String name;
    @Column(unique = true, nullable = false)
    private String email;
    private String dob;


    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    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 String getDob() {
        return dob;
    }

    public void setDob(String dob) {
        this.dob = dob;
    }
}

IUserDAO.java

package ch.concertopro.webshopanalyser.dao;

import ch.concertopro.webshopanalyser.entity.User;
import org.springframework.data.repository.CrudRepository;

public interface IUserDao extends CrudRepository<User, Integer> {

}

UserRepository.java

IntelliJ生成的代码：

package ch.concertopro.webshopanalyser.repository;

import ch.concertopro.webshopanalyser.dao.IUserDao;
import ch.concertopro.webshopanalyser.entity.User;
import org.springframework.stereotype.Repository;

import java.util.Optional;

@Repository
public class UserRepository implements IUserDao {


    @Override
    public <S extends User> S save(S s) {
        return null;
    }

    @Override
    public <S extends User> Iterable<S> saveAll(Iterable<S> iterable) {
        return null;
    }

    @Override
    public Optional<User> findById(Integer integer) {
        return Optional.empty();
    }

    @Override
    public boolean existsById(Integer integer) {
        return false;
    }

    @Override
    public Iterable<User> findAll() {
        return null;
    }

    @Override
    public Iterable<User> findAllById(Iterable<Integer> iterable) {
        return null;
    }

    @Override
    public long count() {
        return 0;
    }

    @Override
    public void deleteById(Integer integer) {

    }

    @Override
    public void delete(User user) {

    }

    @Override
    public void deleteAll(Iterable<? extends User> iterable) {

    }

    @Override
    public void deleteAll() {

    }
}

UserController.java

package ch.concertopro.webshopanalyser.controller;

import ch.concertopro.webshopanalyser.repository.UserRepository;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;


@RestController
public class UserController {
    private final UserRepository userRepository;

    public UserController(UserRepository userRepository) {
        this.userRepository = userRepository;
    }


    @RequestMapping("user")
    public void getUser() {
        System.out.println(userRepository.findAll());
    }
}

我得到的输出总是null。为什么？

Answer 1

您必须自动连接您的用户存储库。

@AutoWired private final UserRepository用户存储库；