SpringBoot---myBatis数据库操作

一，分页查询

• 现在controller中设置参数，@RequestParam(defaultValue = "1") 设置默认值

@GetMapping
public Result page(@RequestParam(defaultValue = "1") Integer page,
                 @RequestParam(defaultValue = "10") Integer pageSize,
                 String name, Short gender,
                 @DateTimeFormat(pattern = "yyyy-MM-dd") LocalDate begin,
                 @DateTimeFormat(pattern = "yyyy-MM-dd") LocalDate end){
log.info("分页查询, 参数: {},{},{},{},{},{}",page,pageSize,name,gender,begin,end);
//调用service分页查询
PageBean pageBean = empService.page(page,pageSize,name,gender,begin,end);
return Result.success(pageBean);
}

• 然后再service实现类中

@Override
    public PageBean page(Integer page, Integer pageSize,String name, Short gender, LocalDate begin, LocalDate end) {
        //1. 设置分页参数
        PageHelper.startPage(page,pageSize);

        //2. 执行查询
        List empList = empMapper.list(name, gender, begin, end);
        Page p = (Page) empList;

        //3. 封装PageBean对象
        PageBean pageBean = new PageBean(p.getTotal(), p.getResult());
        return pageBean;
    }

• 再Mapper接口中

public List list(String name, Short gender, LocalDate begin, LocalDate end);

• 然后再resources下创建xml文件

•  
      
          select *
          from emp
          
            
                name like concat('%', #{name}, '%')
            
            
                and gender = #{gender}
            
            
                and entrydate between #{begin} and #{end}
            
          
          order by update_time desc