Mybatis和spingboot整合

0. 导包

　
  
    org.springframework.boot
    spring-boot-starter-parent
    2.2.0.RELEASE
     
  

  
    
    
      org.springframework.boot
      spring-boot-starter-web
    
    
    
      org.mybatis.spring.boot
      mybatis-spring-boot-starter
      2.1.0
    
    
    
      mysql
      mysql-connector-java
      runtime
    
    
    
      org.projectlombok
      lombok
      true
    

1.创建 application.properties 文件

#数据库配置
spring.datasource.password=ladeng
spring.datasource.url=jdbc:mysql://localhost:3306/schoolSystem??serverTimezone=UTC&useUnicode=true&characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

#时间格式化
spring.jackson.date-format=yyyy-MM-dd HH:mm:ss
#输出日志的级别
logging.level.com.xmg.mapper=debug

2. 创建一个启动类

需要贴人的标签

@MapperScan("需要扫描的包名")
@SpringBootApplication      这个是启动标签

3.  Controller类

@Controller   // 可以在一个类中定义多个接口
@RequestMapping("/stuController")
public class StuController {
     @Autowired
     private StuService stuService;
    
    @RequestMapping("/list")
    @ResponseBody     // json格式
    public List list() {
        return stuService.list();
    }
}

4. Mapper.xml文件

    
        
        
        
        
        
        
        
    

    id, name, age, course_id, create_time

    
        insert into stu (name, age, course_id, create_time)
        values (#{name}, #{age}, #{courseId}, #{createTime})
    

    
        select
        
        from stu
        
        
            <if test="id != null">
                 id = #{id} and
            if>
            <if test="name2 != null and name2 != ''" >
                 name = #{name2} and
            if>
        
        limit 1
    

    
        select
        
        from stu
        
            
            
                #{name}