我有这种类方法来过滤属于特定年份和月份的记录
@posts = Post.filtered(params).published
def self.filtered (params)
unless params[:year].blank? && params[:month].blank?
year = params[:year].to_i
month = params[:month].to_i
return where(created_at: Date.new(year, month, 1)..Date.new(year, month, -1))
end
self
end
生成:
SELECT `posts`.*
FROM `posts`
WHERE (`posts`.`created_at` BETWEEN '2017-09-01' AND '2017-09-30') -- AND ...
在rails c
我做了Post.pluck('id, created_at')
并获得了这些结果
SELECT id, created_at FROM `posts` ORDER BY created_at DESC
=> [[21, Fri, 06 Oct 2017 22:10:00 UTC +00:00],
[22, Sat, 30 Sep 2017 22:10:00 UTC +00:00], # September records
[7, Fri, 08 Sep 2017 19:48:14 UTC +00:00], # is where I get wrong number of records
[4, Tue, 29 Aug 2017 20:55:19 UTC +00:00],
[9, Wed, 16 Aug 2017 02:32:24 UTC +00:00],
[19, Tue, 15 Aug 2017 09:57:58 UTC +00:00],
[14, Mon, 14 Aug 2017 20:03:49 UTC +00:00],
[18, Mon, 14 Aug 2017 16:04:40 UTC +00:00],
[2, Sat, 12 Aug 2017 15:44:21 UTC +00:00],
[15, Sun, 06 Aug 2017 22:36:10 UTC +00:00],
[10, Sat, 22 Jul 2017 23:17:41 UTC +00:00],
[12, Fri, 21 Jul 2017 06:38:29 UTC +00:00],
[17, Sat, 15 Jul 2017 06:49:25 UTC +00:00],
[1, Fri, 14 Jul 2017 22:18:51 UTC +00:00],
[5, Tue, 11 Jul 2017 03:31:57 UTC +00:00],
[16, Sun, 09 Jul 2017 06:17:50 UTC +00:00],
[13, Sat, 08 Jul 2017 09:49:45 UTC +00:00],
[20, Sat, 08 Jul 2017 06:34:16 UTC +00:00],
[3, Thu, 06 Jul 2017 00:12:23 UTC +00:00],
[8, Sun, 02 Jul 2017 20:28:49 UTC +00:00],
[11, Fri, 23 Jun 2017 04:03:01 UTC +00:00],
[6, Wed, 21 Jun 2017 07:02:12 UTC +00:00]]
我已经尝试过每个月的所有记录过滤但是我唯一错误的记录属于9月,我只得到一条记录而不是两条记录。
答案 0 :(得分:1)
Select * from dual
where created_at BETWEEN '2017-09-01' AND '2017-09-30'
可以理解为:
Select * from dual
where created_at >= '2017-09-01 00:00:00'
AND created_at <= '2017-09-30 00:00:00'
而30 Sep 2017 22:10:00
<{1}}并不在2017-09-30 00:00:00
...
编辑:
MySQL 5.6架构设置:
CREATE TABLE t
(`d` datetime)
;
INSERT INTO t
(`d`)
VALUES
('2017-09-30 00:00:00'),
('2017-09-30 02:02:02'),
('2017-09-20 12:12:12'),
('2017-09-08 21:21:21'),
('2017-09-08 00:00:00')
;
查询1 :
select date_format(d,'%Y-%m-%d %k:%i:%s') h from t
where d between '2017-09-08' and '2017-09-30'
order by d
<强> Results 强>:
| h |
|---------------------|
| 2017-09-08 0:00:00 |
| 2017-09-08 21:21:21 |
| 2017-09-20 12:12:12 |
| 2017-09-30 0:00:00 |
查询2 :
select date_format(d,'%Y-%m-%d %k:%i:%s') h from t
where d between '2017-09-08' and '2017-09-30 23:59:59'
order by d
<强> Results 强>:
| h |
|---------------------|
| 2017-09-08 0:00:00 |
| 2017-09-08 21:21:21 |
| 2017-09-20 12:12:12 |
| 2017-09-30 0:00:00 |
| 2017-09-30 2:02:02 |
答案 1 :(得分:1)
...试
def self.filtered(params)
if params[:year].present? && params[:month].present?
year = params[:year].to_i
month = params[:month].to_i
return where(created_at: Date.new(year, month, 1)..Date.new(year, month + 1, 1).to_time - 1.second)
end
self
end
我所做的只是将你的结束日期移到下个月的开始,所以你要求的时间是9月1日午夜,而不是10月1日午夜。