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How to get last N records with activerecord?
...e-wise - at least not up to Rails 3.1. SomeModel.last(5) will execute the select statement without a limit, returning all records of SomeModel to Ruby as an array, after which Ruby will pick out the last (5) elements. Efficiency-wise, currently, you want to use limit - particularly if you have pote...
融资千万美元后的足记要如何应对“爆款后遗症”？ - 资讯 - 清泛网 - 专注C...
融资千万美元后的足记要如何应对“爆款后遗症”？“爆红”近半年后，足记的办公室仍然设在上海愚园东路的上海创客中心这个众创空间里。两间不起眼的办公室塞得满满当当。门口摆放的一个巨大的泡沫字“足记Fotoplace” ...
创业公司如何实施敏捷开发 - 资讯 - 清泛网 - 专注C/C++及内核技术
创业公司如何实施敏捷开发说起敏捷开发，并不是因为敏捷而敏捷。这几年的敏捷开发已经被很多敏捷咨询服务商神话了，这个东西并不是神器，实施了就可以解决所有软件公...说起敏捷开发，并不是因为敏捷而敏捷。这几年的...
Why do you use typedef when declaring an enum in C++?
...amespaces but that is not technically correct. It has three:
Tags (enum, union, and struct)
Labels
(everything else)
typedef enum { } XYZ; declares an anonymous enumeration and imports it into the global namespace with the name XYZ.
typedef enum ABC { } XYZ; declares an enum named ABC in the ta...
List all sequences in a Postgres db 8.1 with SQL
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The following query gives names of all sequences.
SELECT c.relname FROM pg_class c WHERE c.relkind = 'S';
Typically a sequence is named as ${table}_id_seq. Simple regex pattern matching will give you the table name.
To get last value of a sequence use the following query:...
insert multiple rows via a php array into mysql
I'm passing a large dataset into a MySQL table via PHP using insert commands and I'm wondering if its possible to insert approximately 1000 rows at a time via a query other than appending each value on the end of a mile long string and then executing it. I am using the CodeIgniter framework so its f...
App Inventor 2 LLMAI2Ext 自研拓展：接入DeepSeek、Kimi、通义千问...等国...
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Q：使用标签进行输出，内容较多部分内容被隐藏，该如何让其可上下滚动呢？
A：请参考《App Inventor 2 标签内容过多，如何做到可上下滑动？》
Q：如何把图片发给大模型？是否支持此项功能？
A：现已支持！使用支持视觉...
Getting Chrome to accept self-signed localhost certificate
...", then also find it in the list, right click it, expand "> Trust", and select "Always"
Add extendedKeyUsage=serverAuth,clientAuth below basicConstraints=CA:FALSE, and make sure you set the "CommonName" to the same as $NAME when it's asking for setup
You can check your work
openssl verify -CAfil...
Is storing a delimited list in a database column really that bad?
Imagine a web form with a set of check boxes (any or all of them can be selected). I chose to save them in a comma separated list of values stored in one column of the database table.
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SQL (MySQL) vs NoSQL (CouchDB) [closed]
...then things like a lot of their messages, comments etc. I have always used MySQL before but now I am minded to try something new like couchdb or similar which is not SQL.
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