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pom.xml引入jar

           
               
    
     org.mybatis.spring.boot
                
    
     mybatis-spring-boot-starter
                
    
     1.3.0
            
            
           
               
    
     com.baomidou
                
    
     mybatis-plus-boot-starter
                
    
     3.0.6
            
   

#application.properties配置文件中设置MybatisPlus的mapper文件扫描

mybatis-plus.mapper-locations=classpath*:扫描包下的路径/*Mapper.xml//我的路径是mybatis-plus.mapper-locations=classpath*:com/zgf/springboot03loggin/mapper/xml/*Mapper.xml

mapper层的接口继承BaseMapper泛型类传递一个需要执行增删改查的实体类，

@Mapperpublic interface IPhoneMapper extends BaseMapper
   <实体类>
    {
   }
   

entity类代码

//自动封装实体类数据@Data//标识使用的数据库表@TableName("book")public class BookEntity {
       //自动映射数据库主键    @TableId(type = IdType.AUTO)    private int id;    //@TableField("数据库列名")    private String name;    private String author;    private int tid;    private double Bmoney;}

Service层

public interface IBookService extends IService
   
     {
   }
   

service的实现层

public class IBookServiceImpl extends ServiceImpl
   
     implements IBookService {
   }Controller层```java@Controllerpublic class BookController {
       @Resource(name = "iBookServiceImpl")    IBookService iBookService;    @RequestMapping("/select")    @ResponseBody    public String select(){
           return JSON.toJSONString(iBookService.list());    }}
   

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