Spring Boot MySQL

Question

I am trying to access my database and return some of the results. I have watched a bunch of tutorials but each one seems to be off. Right now the @Autowired is giving an error of 'No Beans of UserRepository type found If anyone could help me it would be greatly appreciated. Here is what I have so far.

Controller

package com.rdopler.ecommerceTest.controller;
import java.util.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping(path="/user")
public class UserController {

    @Autowired
    UserRepository userRepository;
    @GetMapping
    public String check() {
        return "Welcome";
    }
@GetMapping(path="/getusernames")
    public List<String>getAllUserNames() {

        return userRepository.getAllUserNames();

    }
}

Repo

package com.rdopler.ecommerceTest.repository;

import org.springframework.beans.factory.annotation.Autowired;
import java.util.*;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;

@Repository
public class UserRepository {
    @Autowired
    JdbcTemplate jdbcTemplate;
    public List<String> getAllUserNames() {

        List<String> usernameList = new ArrayList<>();
        usernameList.addAll(jdbcTemplate.queryForList("select * from employees ", String.class);
        return usernameList;
    }
}

application.properties

spring.jpa.hibernate.ddl-auto=none
spring.datasource.url=jdbc:mysql://localhost:3306/storeDB?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=*****

Main:

package com.rdopler.ecommerceTest;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class EcommerceTestApplication {

    public static void main(String[] args) {
        SpringApplication.run(EcommerceTestApplication.class, args);
    }

}

Answer 1

请尝试在主类中添加@EnableJpaRepositories（“ packagename”）。

Answer 2

In your main app try adding this annotation below @SpringBootApplication

@ComponentScan(basePackages = "com.rdopler.ecommerceTest")

It will help you to scan all your components. Also if you have any service(s) in your application, make sure you annotate that/those with @Service annotation.

Answer 3

将@Component添加到类UserRepository

Answer 4

在UserRepository中添加@Transactional，也在主类中添加@ComponentScan。