Add CRUD operations for news

src/main/java/com/adlternative/tinyhacknews/controller/NewsController.java

@@ -0,0 +1,41 @@
+package com.adlternative.tinyhacknews.controller;
+
+import com.adlternative.tinyhacknews.entity.News;
+import com.adlternative.tinyhacknews.service.NewsService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/api/v1/news")
+public class NewsController {
+
+  @Autowired
+  private NewsService newsService;
+
+  @PostMapping
+  public News createNews(@RequestBody News news) {
+    return newsService.createNews(news);
+  }
+
+  @GetMapping("/{id}")
+  public News getNewsById(@PathVariable("id") Long id) {
+    return newsService.getNewsById(id);
+  }
+
+  @GetMapping
+  public List<News> getAllNews() {
+    return newsService.getAllNews();
+  }
+
+  @PutMapping("/{id}")
+  public News updateNews(@PathVariable("id") Long id, @RequestBody News news) {
+    return newsService.updateNews(id, news);
+  }
+
+  @DeleteMapping("/{id}")
+  public void deleteNews(@PathVariable("id") Long id) {
+    newsService.deleteNews(id);
+  }
+}

src/main/java/com/adlternative/tinyhacknews/db/schema.sql

@@ -6,3 +6,12 @@ CREATE TABLE Users (
                       createdAt DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
                       updatedAt DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+CREATE TABLE News (
+                      id INT PRIMARY KEY AUTO_INCREMENT,
+                      title VARCHAR(255) NOT NULL,
+                      content TEXT NOT NULL,
+                      author VARCHAR(50) NOT NULL,
+                      createdAt DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+                      updatedAt DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

src/main/java/com/adlternative/tinyhacknews/entity/News.java

@@ -0,0 +1,21 @@
+package com.adlternative.tinyhacknews.entity;
+
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+
+import java.util.Date;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+public class News {
+    private Long id;
+    private String title;
+    private String content;
+    private String author;
+    private Date createdAt;
+    private Date updatedAt;
+}

src/main/java/com/adlternative/tinyhacknews/mapper/NewsMapper.java

@@ -0,0 +1,33 @@
+package com.adlternative.tinyhacknews.mapper;
+
+import com.adlternative.tinyhacknews.entity.News;
+import java.util.List;
+import java.util.Optional;
+import org.apache.ibatis.annotations.Delete;
+import org.apache.ibatis.annotations.Insert;
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Options;
+import org.apache.ibatis.annotations.Select;
+import org.apache.ibatis.annotations.Update;
+import org.springframework.stereotype.Component;
+
+@Mapper
+@Component
+public interface NewsMapper {
+
+  @Insert("INSERT INTO News (title, content, author, createdAt, updatedAt) VALUES (#{title}, #{content}, #{author}, #{createdAt}, #{updatedAt})")
+  @Options(useGeneratedKeys = true, keyProperty = "id")
+  int insert(News news);
+
+  @Select("SELECT * FROM News WHERE id = #{id}")
+  Optional<News> selectById(Long id);
+
+  @Select("SELECT * FROM News")
+  List<News> selectAll();
+
+  @Update("UPDATE News SET title=#{title}, content=#{content}, author=#{author}, updatedAt=#{updatedAt} WHERE id=#{id}")
+  int update(News news);
+
+  @Delete("DELETE FROM News WHERE id=#{id}")
+  int delete(Long id);
+}

src/main/java/com/adlternative/tinyhacknews/service/NewsService.java

@@ -0,0 +1,12 @@
+package com.adlternative.tinyhacknews.service;
+
+import com.adlternative.tinyhacknews.entity.News;
+import java.util.List;
+
+public interface NewsService {
+    News createNews(News news);
+    News getNewsById(Long id);
+    List<News> getAllNews();
+    News updateNews(Long id, News news);
+    void deleteNews(Long id);
+}

src/main/java/com/adlternative/tinyhacknews/service/impl/NewsServiceImpl.java

@@ -0,0 +1,44 @@
+package com.adlternative.tinyhacknews.service.impl;
+
+import com.adlternative.tinyhacknews.entity.News;
+import com.adlternative.tinyhacknews.mapper.NewsMapper;
+import com.adlternative.tinyhacknews.service.NewsService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public class NewsServiceImpl implements NewsService {
+
+    @Autowired
+    private NewsMapper newsMapper;
+
+    @Override
+    public News createNews(News news) {
+        newsMapper.insert(news);
+        return news;
+    }
+
+    @Override
+    public News getNewsById(Long id) {
+        return newsMapper.selectById(id).orElse(null);
+    }
+
+    @Override
+    public List<News> getAllNews() {
+        return newsMapper.selectAll();
+    }
+
+    @Override
+    public News updateNews(Long id, News news) {
+        news.setId(id);
+        newsMapper.update(news);
+        return news;
+    }
+
+    @Override
+    public void deleteNews(Long id) {
+        newsMapper.delete(id);
+    }
+}

src/main/resources/application.yml

@@ -7,3 +7,7 @@ spring:
         username: tiny-hacknews
         password: 123456
         driver-class-name: com.mysql.cj.jdbc.Driver
+
+mybatis:
+    mapper-locations: classpath:mapper/*.xml
+    type-aliases-package: com.adlternative.tinyhacknews.entity