Springboot integrates MyBatis-plus: database additions, deletions, and changes

Springboot integrates MyBatis-plus: database additions, deletions, and changes

1. Database query operation

	@Test
    void contextLoads(){
   
    
    
        //参数是一个Wrapper，条件构造器，不用赋值Null
        //查询全部用户
        List<Stu_info> stus = stuMapper.selectList(null);