Question

我有一个基于this guide的简单项目。我创建了一个简单的REST接口，我想让它使用我的数据库。我将Hibernate添加到依赖项并创建了DAO类。我使用Spring Tool-Suite for IDE。据我所知，我应该添加一些豆子来告诉班级使用什么，但我不明白怎么做。这是我的课程。

Application.java

package com.learnspring.projectfirst;

@SpringBootApplication
public class Application {

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

Marker.java

package com.learnspring.projectfirst;

@Entity
public class Marker {

    @Id
    @Column
    @GeneratedValue(strategy=GenerationType.AUTO)
    private long id;
    @Column
    private double longitude;
    @Column
    private double latitude;

    @Column
    private String address;

    public Marker() {
        // Empty constructor
    }

    public Marker(long id, double longitude, double latitude, String address) {
        this.id = id;
        this.longitude = longitude;
        this.latitude = latitude;
        this.address = address;
    }

    //Getters and Setters
}

MarkerController.java

package com.learnspring.projectfirst.controller;

@Controller
public class MarkerController {
    private Logger logger = Logger.getLogger(MarkerController.class.getName());
    @Autowired
    private MarkerServiceImplementation markerService;

    @RequestMapping(value="/markers", method=RequestMethod.GET)
    public @ResponseBody List<Marker> getMarkers(@RequestParam(value="city", defaultValue="") String city) {
        return this.markerService.getAllMarkers();
    }

    @RequestMapping(value="/markers/new", method=RequestMethod.POST)
    public @ResponseBody Marker addMarker(@RequestBody Marker marker) {
        this.markerService.addMarker(marker);
        return marker;
    }

}

MarkerDaoImplementation.java

package com.learnspring.projectfirst.dao;

@Repository
public class MarkerDaoImplementation implements MarkerDaoInterface {

    @Autowired
    private SessionFactory sessionFactory;

    @Override
    public void addMarker(Marker marker) {
        this.sessionFactory.getCurrentSession().save(marker);
    }

    @Override
    public void deleteMarker(int markerId) {
        this.sessionFactory.getCurrentSession().delete(this.getMarker(markerId));
    }

    @Override
    public Marker getMarker(int markerId) {
        return (Marker) this.sessionFactory.getCurrentSession().get(Marker.class, markerId);
    }

    @Override
    public List<Marker> getAllMarkers() {
        return this.sessionFactory.getCurrentSession().createQuery("from Marker").list();
    }

}

MarkerServiceImplementation.java

package com.learnspring.projectfirst.service;

@Service
public class MarkerServiceImplementation implements MarkerServiceInterface {
    @Autowired
    private MarkerDaoImplementation markerDao;

    @Transactional
    public void addMarker(Marker marker) {
        this.markerDao.addMarker(marker);
    }

    @Transactional
    public void deleteMarker(int markerId) {
        this.markerDao.deleteMarker(markerId);
    }

    @Transactional
    public Marker getMarker(int markerId) {
        return this.markerDao.getMarker(markerId);
    }

    @Transactional
    public List<Marker> getAllMarkers() {
        return this.markerDao.getAllMarkers();
    }
}

这是文件结构：

enter image description here

我知道我应该告诉我的程序数据库名称和使用bean的列，但我不明白如何。如何将java代码链接到bean？对不起，我粘贴了很多代码，我只是想确保你拥有所需的一切。提前谢谢！

Answer 1

这是您需要的：Spring Boot with MySQL

Answer 2

参考此示例：Spring MVC with JdbcTemplate Example

Answer 3

“Marker”类中的注释确定MySQL表和列名（基于类和类变量名）。表名为“marker”，列为“id”，“longitude”，“latitude”，“address”。

您忘记了代码中最重要的部分：弹簧配置。它决定了在注入DAO类之前如何初始化SessionFactory实例。在这里，您必须设置与MySQL服务器的适当连接（例如，通过JNDI资源）

如何将Spring与MySQL数据库连接？

3 个答案: