SpringBoot整合MybatisPlus 3.0

1. 添加pom依赖

   <!-- druid数据库连接池启动器 -->
   <dependency>
       <groupId>com.alibaba</groupId>
       <artifactId>druid-spring-boot-starter</artifactId>
       <version>1.1.9</version>
   </dependency>
   <dependency>
       <groupId>mysql</groupId>
       <artifactId>mysql-connector-java</artifactId>
       <scope>runtime</scope>
       <version>5.1.46</version>
   </dependency>
   <!-- mybatis-plus启动器 -->
   <dependency>
       <groupId>com.baomidou</groupId>
       <artifactId>mybatis-plus-boot-starter</artifactId>
       <version>3.0.1</version>
   </dependency>

2. application.properties配置

   spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
   spring.datasource.username=root
   spring.datasource.password=123
   spring.datasource.url=jdbc:mysql://localhost:3306/mp_demo?useUnicode=true&characterEncoding=utf-8&useSSL=false

3. 编写实体类

   /**
    * @author wsyjlly
    * @create 2019.06.29 - 12:18
    **/
   @AllArgsConstructor
   @NoArgsConstructor
   @Accessors
   @Data
   @TableName(value = "message")
   public class Message implements Serializable {
       private Integer id;
       private Integer mid;
       private String content;
       @TableField(value = "column_200")
       private String column1;
       @TableField(value = "column_500")
       private String column2;
       @TableField(value = "column_5000")
       private String column3;
   }

4. 编写mapper接口继承BaseMapper接口的数据操作方法

   /**
    * @author wsyjlly
    * @create 2019.06.29 - 12:30
    **/
   @Mapper
   public interface MessageMapper extends BaseMapper<Message> {}

5. 编写Service

   /**
    * @author wsyjlly
    * @create 2019.06.29 - 12:33
    **/
   public interface MessageService {
       List<Message> getAllMessage();
       List<Message> getMessageByMid(Integer mid);
       Integer fetchOne(Integer id,Integer mid);
       Integer updateMessageByModuleIdAndMessageId(Message message);
       Integer addMessage(Message message);
       Integer deleteMessage(Integer mid,Integer id);
   }

   /**
    * @author wsyjlly
    * @create 2019.06.29 - 13:29
    **/
   @Service
   public class MessageServiceImpl implements MessageService {
       @Autowired
       private MessageMapper messageMapper;
       private Logger logger = LoggerFactory.getLogger(getClass());
   
       @Override
       public List<Message> getAllMessage() {
           return messageMapper.selectList(new QueryWrapper<Message>());
       }
   
       @Override
       public List<Message> getMessageByMid(Integer mid) {
           return messageMapper.selectList(new QueryWrapper<Message>().eq("mid",mid));
       }
   
       @Override
       public Integer fetchOne(Integer id,Integer mid){
           return messageMapper.selectCount(new QueryWrapper<Message>().eq("id",id).eq("mid",mid));
       }
   
       @Override
       public Integer updateMessageByModuleIdAndMessageId(Message message){
           System.out.println(message);
           logger.debug(message.toString());
           return messageMapper.updateById(message);
       }
       @Override
       public Integer addMessage(Message message){
           System.out.println(message);
           logger.debug(message.toString());
           return messageMapper.insert(message);
       }
       @Override
       public Integer deleteMessage(Integer mid,Integer id){
           logger.debug(mid+"-"+id);
           return messageMapper.delete(new QueryWrapper<Message>().eq("id",id).eq("mid",mid));
       }
   }

6. 编写Controller

   /**
    * @author wsyjlly
    * @create 2019.06.29 - 12:52
    **/
   @RestController
   public class MainController {
       @Autowired
       private MessageService messageService;
   
       @GetMapping("/messages")
       public ModelMap getMessages(){
           ModelMap map = new ModelMap();
           return map.addAttribute("messages",messageService.getAllMessage());
       }
   
       @GetMapping("module1")
       public Object getMessageType1(){
           return messageService.getMessageByMid(1);
       }
       
       @GetMapping("module2")
       public Object getMessageType2(){
           return messageService.getMessageByMid(2);
       }
       
       @PostMapping("/message")
       public ModelMap addMessage(@RequestBody Message message){
           ModelMap map = new ModelMap();
           Integer result = messageService.addMessage(message);
           if (result==1){
               map.addAttribute("result",true);
               map.addAttribute("tip","添加成功！");
           }else{
               map.addAttribute("result",false);
               map.addAttribute("tip","添加失败！");
           }
           return map;
       }
       
       @DeleteMapping("/{mid}/{id}")
       public ModelMap deleteMessage(@PathVariable Integer mid,@PathVariable Integer id){
           System.out.println(mid);
           System.out.println(id);
           ModelMap map = new ModelMap();
           Integer result = messageService.deleteMessage(mid,id);
           if (result==1){
               map.addAttribute("result",true).addAttribute("tip","删除成功！");
           }else{
               map.addAttribute("result",false).addAttribute("tip","删除失败！");
           }
           return map;
       }
       
       @PatchMapping("/message")
       public ModelMap updateMessage(@RequestBody Message message){
           Integer one = messageService.fetchOne(message.getId(), message.getMid());
           ModelMap map = new ModelMap();
           if (one==1){
               Integer result = messageService.updateMessageByModuleIdAndMessageId(message);
               if (result==1){
                   map.addAttribute("result",true).addAttribute("tip","更新成功！");
               }else{
                   map.addAttribute("result",false).addAttribute("tip","更新失败！");
               }
               System.out.println(message);
           }else{
               map.addAttribute("tip","查询异常！");
           }
           return map;
       }
   }

7. 显示结果