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MySQL: Fastest way to count number of rows
...ow count, it doensn't count all rows each time you try to count all rows. (based on primary key's column)
Using PHP to count rows is not very smart, because you have to send data from mysql to php. Why do it when you can achieve the same on the mysql side?
If the COUNT(*) is slow, you should run E...
Decompile .smali files on an APK [duplicate]
...ex file into .smali and binary .xml to human readable xml.
The sequence (based on APK Manager 4.9) is 22 to select the package, and then 9 to decompile it. If you press 1 instead of 9, then you will just unpack it (useful only if you want to exchange .png images).
There is no tool available to d...
Difference between DateTime and Time in Ruby
... to handle larger values without producing errors.
DateTime is a calendar-based approach where the year, month, day, hour, minute and second are stored individually. This is a Ruby on Rails construct that serves as a wrapper around SQL-standard DATETIME fields. These contain arbitrary dates and can...
How can you determine how much disk space a particular MySQL table is taking up?
...mysql installed by default:
[you@yourbox]$ ls -lha /var/lib/mysql/<databasename>
based on NIXCRAFT's mysql db location
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Identify duplicates in a List
... elements just get distributed between their two possible result locations based on the relevant bit.
– Holger
Jan 26 '18 at 7:37
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C# - how to determine whether a Type is a number
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How can you downvote me on an answer based on current technology. Maybe in .NET 62, int will be removed - are you going to downvote all answers with int?
– Philip Wallace
Nov 27 '09 at 19:09
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What is Cache-Control: private?
...st has to be a something.
If I'm pulling a list of products out of a database, the server can send the last rowversion as an ETag, rather than a date:
200 OK
ETag: "247986"
My ETag can be the SHA1 hash of a static resource (e.g. image, js, css, font), or of the cached rendered page (i.e. this i...
Rails 3: Get Random Record
...
here we go
rails way
#in your initializer
module ActiveRecord
class Base
def self.random
if (c = count) != 0
find(:first, :offset =>rand(c))
end
end
end
end
usage
Model.random #returns single random object
or the second thought is
module ActiveRecord
c...
How to import a jar in Eclipse
...e a new name in this field, the application client project will be created based on the version of the application client JAR file, and it will use the default location.
In the Target runtime drop-down list, select the application server that you want to target for your development. This selection a...
How does one unit test routes with Express?
...re detailed example.
/// usercontroller.js
var UserController = {
_database: null,
setDatabase: function(db) { this._database = db; },
findUserByEmail: function(email, callback) {
this._database.collection('usercollection').findOne({ email: email }, callback);
}
};
module.expor...