springboot与mybatis完成简单的增删改查

简单的完成一个springboot和mybatis的增删改查
pom中一定要引入的两个包

 
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
            2.0.1
        

        
            mysql
            mysql-connector-java
            runtime
        

我新建的表结构

applicatio.properties中的配置信息

#端口号
server.port: 8083//  端口号是可以修改的
#数据库链接设置
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url: jdbc:mysql://localhost:3306/new?useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true
spring.datasource.username: 你自己的用户名
spring.datasource.password: 你自己的代码
#整合Mybatis
mybatis.type-aliases-package: com.example.firstspringboot.entity
#mybatis 对应的 .xml文件路径
mybatis.mapper-locations: classpath:mapper/*.xml 
#  多层级目录  mapper-locations: classpath:mapper/**/**.xml

修改后表的目录结构

实体类People.class

public class People {
    private  String id;
    private String name;

    public People() {
    }

    public People(String id, String name) {
        this.id = id;
        this.name = name;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

Peoplemapper.java

package com.example.firstspringboot.mapper;

import com.example.firstspringboot.entity.People;

public interface Peoplemapper {
    /**
     * 完成简单的增删改查功能
     */
    int insert(People people);
    int deleteByPrimaryKey(String id);
    int updateByPrimaryKey(People people);
    People selectByPrimaryKey(String id);

}

注意此时的@SpringBootApplication要多加上一个配置

@SpringBootApplication
@MapperScan("com.example.firstspringboot.mapper")
public class FirstspringbootApplication {

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

}

PeopleService.java这个应该是一个接口，然后由接口的实现类去实现逻辑功能，太麻烦直接就在里面写了

@Service
public class PeopleService {
    @Autowired
    private Peoplemapper peoplemapper;

   public  int insert(People people) {
       peoplemapper.insert(people);
        return 0;
    }

  public   int deleteByPrimaryKey(String id) {
       peoplemapper.deleteByPrimaryKey(id);
        return 0;
    }

  public   int updateByPrimaryKey(People people) {
       peoplemapper.updateByPrimaryKey(people);
       return 0;
    }

    public People selectByPrimaryKey(String id) {

        return  peoplemapper.selectByPrimaryKey(id);
    }
}

PeopleController

@RestController
public class PeopleController {
    @Autowired
    private PeopleService peopleService;
    @RequestMapping(value = "/delete/{id}",method = RequestMethod.DELETE)
    public void deletepeople(@PathVariable("id") String id){
        peopleService.deleteByPrimaryKey(id);
    }
    @ResponseBody
    @RequestMapping(value = "/insert",method = RequestMethod.POST)
    public void insertpeople(@RequestBody People people){
        System.out.println("运行");
        peopleService.insert(people);

    }
    @RequestMapping(value = "/update",method = RequestMethod.POST)
    public void updatepeople(@RequestBody People people){
        peopleService.updateByPrimaryKey(people);
    }
    @ResponseBody
    @RequestMapping(value = "/select/{id}",method = RequestMethod.GET)
    public People selectpeople(@PathVariable("id") String id ){

        return peopleService.selectByPrimaryKey(id);
    }
}

peoplemapper.xml

    


 
     select * from people where id =#{id}
 
 
     delete from people where id = #{id}
 
    
    insert  into people(id ,name ) values(#{id},#{name})
    
    
        update people set name =#{name } where id =#{id}
    

然后我使用的postman做的测试。