用limit 实现java的简单分页

mysql 中limit 用法

select * from table limit m,n       
在mysql中, m代表index, 默认从0 开始;   n最小从m+1开始,取n条
意思是: 在table数据库中, 从m开始,拉取n条数据.

limit start,size           从start条开始,获取size条数据

分页实现

前端:

将page 和 rows 两个参数传递给后端	
page : 代表第几页
rows:  代表当前页显示的数据条数

java思路:

获取当前页的第一条: (page-1)*rows	
sql语句查询分页: 	 limit (page-1)*rows,rows

后端:

Controller:

@Autowired
private ActivityService activityService;
	
@RequestMapping("/url")
public ResponseEntity<?> getRecords(@RequestParam("uid") String uid,
                                        @RequestParam(value="page",required = false, defaultValue ="1") int page,
                                        @RequestParam(value="rows",required = false, defaultValue ="25") int rows){ 
    List<MyRecord> records = activityService.getMyRecord(uid,page,rows);
    JSONObject result = new JSONObject();
    result.put("result", "ok");
    result.put("records", records);
    return new ResponseEntity<>(result, HttpStatus.OK);
}

Service:

@Autowired
private ActivityMapper activityMapper;

public List<MyRecord> getMyRecord(String uid, int page, int rows) {
    int i = (page - 1) * rows;
    List<MyRecord> records = activityMapper.getMyRecordToPage(uid, i, rows);
    return records;
}

Dao:

@Select("select * from myRecord where uid = #{0} order by create_time desc limit #{1},#{2}")
List<NineMyRecord> getMyWinRecordToPage(String uid, int i, int rows);