1，本章大纲

（1）动态语言注解
（2）@Provider使用思路
（3）@SelectProvider小试牛刀
（4）@SelectProvider初露锋芒
（5）@SelectProvider过关斩将
（6）@InsertProvider小弟不敢当
（7）@UpdateProvider你加我来改
（8）@DeleteProvider不高兴就删

controller

    @RequestMapping("/sportshow")
    public String SportShow(Integer page,Integer pageSize, String seanum) {
        APIResultModel result = new APIResultModel();
      result = schoolSportsMettingService.SportShow(page,pageSize, seanum, result);
        return result.toString();

    }

service

    public APIResultModel SportShow(Integer page, Integer pageSize,String seanum, APIResultModel result) {
        PageHelper.startPage(page, pageSize);  //一行代码实现分页
        Integer age=12;
      List<SchoolSportsMettingEntity> list = schoolSportsMettingMapper.SportShow(age);
        PageInfo<SchoolSportsMettingEntity> pagehelper = new PageInfo<>(list); //装填数据
        result.setData(pagehelper);

  result.setCode(EnumAPIResultcode.SUCCESS_INIT.getCode());
        return result;
    }

mapper

    @SelectProvider(type = SqlProvider.class,method = "SportShow")
    List<SchoolSportsMettingEntity> SportShow(  Integer age);
//或者   List<SchoolSportsMettingEntity> SportShow( @Param Integer age);

  SqlProvider  为class类，  SportShow 为对应的方法

SqlProvider 类

package com.yuqiyu.schoolcms.provider;

import org.apache.ibatis.annotations.Param;

public class SqlProvider {

public  String  SportShow(@Param(value="age") Integer age){  //传单个参数时候必须写, 有多个参数就传递多个参数
     StringBuffer sql =new StringBuffer("select * from  school_sports a where 1=1");
   if(age!=null){
          sql.append(" and a.age =#{age}");  //这里要注意 and 那里要留个空
    }
          return  sql.toString();
}

}