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Random record in ActiveRecord
...that using offset is very slow with large dataset, since it actually needs index scan (or table scan, in case clustered index is used like InnoDB). In other words, it's O(N) operation but "WHERE id >= #{rand_id} ORDER BY id ASC LIMIT 1" is O(log N), which is much faster.
– k...
Vim: Close All Buffers But This One
How can I close all buffers in Vim except the one I am currently editing?
13 Answers
1...
How can I have lowercase routes in ASP.NET MVC?
...{action}/{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
);
}
Also assuming you are doing this for SEO reasons you want to redirect incoming urls to lowercase (as said in many of the links off this article).
protected void Applica...
Datetime equal or greater than today in MySQL
... Do not use functions on columns, it makes the query to ignore index, causing slow queries. Check my answer for alternative approach stackoverflow.com/a/42365426/4311336
– Bsienn
Aug 26 '19 at 13:00
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汇编常用寄存器及指令基础总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...址指针寄存器，可用作SS的一个相对基址位置
SI（Source Index）：源变址寄存器可用来存放相对于DS段之源变址指针
DI（Destination Index）：目的变址寄存器，可用来存放相对于 ES 段之目的变址指针
FR（Flag Register）：单独的十六位...
Get Character value from KeyCode in JavaScript… then trim
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Readable key names indexed by key code
There are relatively few key codes so I simply listed all the corresponding values in a static array so I could simply convert the number 65 into A using keyboardMap[65]
Not all key codes map to a printa...
How to change default timezone for Active Record in Rails?
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I have decided to compile this answer because all others seem to be incomplete.
config.active_record.default_timezone determines whether to use Time.local (if set to :local) or Time.utc (if set to :utc) when pulling dates and times from the database. The default is :...
git revert back to certain commit [duplicate]
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You can revert all your files under your working directory and index by typing following this command
git reset --hard <SHAsum of your commit>
You can also type
git reset --hard HEAD #your current head point
or
git reset --hard HEAD^ #your previous head point
Hope it help...
Store images in a MongoDB database
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GridFS is for documents > 16MB. Not all binary data is this large. Other than being able to surpass that limit, is there any other benefits to using GridFS instead of just the BinData type?
– Brandon Fitzpatrick
Jan 29 '1...
Does Python have a ternary conditional operator?
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You can index into a tuple:
(falseValue, trueValue)[test]
test needs to return True or False.
It might be safer to always implement it as:
(falseValue, trueValue)[test == True]
or you can use the built-in bool() to assure a Boo...