SpringBoot实现单表增删改查

项目结构

配置文件

1. pom.xml

   
   <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
       <modelVersion>4.0.0modelVersion>
   
       
       <parent>
           <groupId>org.springframework.bootgroupId>
           <artifactId>spring-boot-starter-parentartifactId>
           <version>2.0.4.RELEASEversion>
           <relativePath/> 
       parent>
       <groupId>com.xiaogegroupId>
       <artifactId>springboot_mybatisartifactId>
       <version>0.0.1-SNAPSHOTversion>
       <name>springboot_mybatisname>
       <description>Demo project for Spring Bootdescription>
   
       <properties>
           <java.version>1.8java.version>
       properties>
   
       <dependencies>
           
           <dependency>
               <groupId>org.springframework.bootgroupId>
               <artifactId>spring-boot-starter-webartifactId>
           dependency>
   
           
           <dependency>
               <groupId>org.springframework.bootgroupId>
               <artifactId>spring-boot-starter-testartifactId>
           dependency>
   
           
           <dependency>
               <groupId>org.mybatis.spring.bootgroupId>
               <artifactId>mybatis-spring-boot-starterartifactId>
               <version>1.3.4version>
           dependency>
   
           
           <dependency>
               <groupId>mysqlgroupId>
               <artifactId>mysql-connector-javaartifactId>
           dependency>
   
           
           <dependency>
               <groupId>org.projectlombokgroupId>
               <artifactId>lombokartifactId>
           dependency>
           <dependency>
               <groupId>org.junit.jupitergroupId>
               <artifactId>junit-jupiter-apiartifactId>
               <scope>testscope>
           dependency>
   
       dependencies>
   
       <build>
           <plugins>
               
               <plugin>
                   <groupId>org.springframework.bootgroupId>
                   <artifactId>spring-boot-maven-pluginartifactId>
               plugin>
           plugins>
       build>
   
   project>
   
   

2. application.properties

   # 数据库连接信息
   spring.datasource.driverClassName=com.mysql.jdbc.Driver
   spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?serverTimezone=UTC&useUnicode=true&characterEncoding=utf8&useSSL=false
   spring.datasource.username=root
   spring.datasource.password=root
   
   # 配置mybatis信息
   # spring集成Mybatis环境
   # pojo别名扫描包
   mybatis.type-aliases-package=com.xiaoge.pojo
   #加载Mybatis映射文件
   mybatis.mapper-locations=classpath:mapper/*Mapper.xml
   

3. UserMapper.xml

   
   
   <mapper namespace="com.xiaoge.mapper.UserMapper">
       <select id="queryUserList" resultType="user">
           select * from user
       select>
   mapper>
   

实现类

1. User

   package com.xiaoge.pojo;
   
   import lombok.Data;
   
   /**
    * @program: springboot_mybatis
    * @description:
    * @author: Mr.Xiao
    * @create: 2020-05-03 17:57
    **/
   @Data
   public class User {
   
       // 主键
       private Long id;
       // 用户名
       private String username;
       // 密码
       private String password;
       // 姓名
       private String name;
   
   }
   

持久层

1. UserMapper

   package com.xiaoge.mapper;
   
   import com.xiaoge.pojo.User;
   import org.apache.ibatis.annotations.Mapper;
   
   import java.util.List;
   
   /**
    * @program: springboot_mybatis
    * @description:
    * @author: Mr.Xiao
    * @create: 2020-05-03 18:00
    **/
   @Mapper
   public interface UserMapper {
   
       public List<User> queryUserList();
   
   }
   

业务层

1. UserService接口

   package com.xiaoge.service;
   
   import com.xiaoge.pojo.User;
   
   import java.util.List;
   
   /**
    * @program: springboot_mybatis
    * @description:
    * @author: Mr.Xiao
    * @create: 2020-05-03 18:56
    **/
   public interface UserService {
   
       public List<User> queryUserList();
   
   }
   
   

2. UserServiceImpl实现类

   package com.xiaoge.service.impl;
   
   import com.xiaoge.mapper.UserMapper;
   import com.xiaoge.pojo.User;
   import com.xiaoge.service.UserService;
   import org.springframework.beans.factory.annotation.Autowired;
   import org.springframework.stereotype.Service;
   
   import java.util.List;
   
   /**
    * @program: springboot_mybatis
    * @description:
    * @author: Mr.Xiao
    * @create: 2020-05-03 18:56
    **/
   @Service
   public class UserServiceImpl implements UserService {
   
       @Autowired
       private UserMapper userMapper;
   
       @Override
       public List<User> queryUserList() {
           return userMapper.queryUserList();
       }
   }
   

表现层

1. MybatisController

   package com.xiaoge.controller;
   
   import com.xiaoge.mapper.UserMapper;
   import com.xiaoge.pojo.User;
   import com.xiaoge.service.UserService;
   import org.springframework.beans.factory.annotation.Autowired;
   import org.springframework.web.bind.annotation.GetMapping;
   import org.springframework.web.bind.annotation.RestController;
   
   import java.util.List;
   
   /**
    * @program: springboot_mybatis
    * @description:
    * @author: Mr.Xiao
    * @create: 2020-05-03 18:54
    **/
   @RestController
   public class MybatisController {
   
       @Autowired
       private UserService UserService;
   
       @GetMapping("/query")
       public List<User> queryUserList(){
           List<User> users = UserService.queryUserList();
           return users;
       }
   
   }
   

引导类

1. SpringbootMybatisApplication

   package com.xiaoge;
   
   import org.springframework.boot.SpringApplication;
   import org.springframework.boot.autoconfigure.SpringBootApplication;
   
   @SpringBootApplication
   public class SpringbootMybatisApplication {
   
       public static void main(String[] args) {
           SpringApplication.run(SpringbootMybatisApplication.class, args);
       }
   
   }
   
   

测试

1. MybatisTest

   package com.xiaoge;
   
   import com.xiaoge.mapper.UserMapper;
   import com.xiaoge.pojo.User;
   
   import org.junit.Test;
   import org.junit.runner.RunWith;
   import org.springframework.beans.factory.annotation.Autowired;
   import org.springframework.boot.test.context.SpringBootTest;
   import org.springframework.test.context.junit4.SpringRunner;
   
   import java.util.List;
   
   /**
    * @program: springboot_mybatis
    * @description:
    * @author: Mr.Xiao
    * @create: 2020-05-03 19:09
    **/
   @RunWith(SpringRunner.class)
   @SpringBootTest(classes = SpringbootMybatisApplication.class) // 指定引导类的class字节码
   public class MybatisTest {
   
       @Autowired
       private UserMapper userMapper;
   
       @Test
       public void test() {
           List<User> users = userMapper.queryUserList();
           System.out.println(users);
       }
   
   }