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How do I find where JDK is installed on my windows machine?
...mework/Versions/Current/Commands/java
If you are using Windows:
c:\> for %i in (java.exe) do @echo. %~$PATH:i
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Adding placeholder text to textbox
I am looking for a way to add placeholder text to a textbox like you can with a textbox in html5.
24 Answers
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What column type/length should I use for storing a Bcrypt hashed password in a Database?
... a hashed password (using BCrypt) in a database. What would be a good type for this, and which would be the correct length? Are passwords hashed with BCrypt always of same length?
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MongoDB not equal to
...Use $ne -- $not should be followed by the standard operator:
An examples for $ne, which stands for not equal:
use test
switched to db test
db.test.insert({author : 'me', post: ""})
db.test.insert({author : 'you', post: "how to query"})
db.test.find({'post': {$ne : ""}})
{ "_id" : ObjectId("4f68b1...
Send email with PHPMailer - embed image in body
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For who need an explanation from a non expert: you need to tell the rendering engine from where to get the image and with what protocol (to use an image that is attached you use de cid "protocol, Content-ID). And you use AddE...
Why won't my PHP app send a 404 error?
...y, 404s are handled by the web server.
User: Hey, do you have anything for me at this URI webserver?
Webserver: No, I don't, 404! Here's a page to display for 404s.
The problem is, once the web server starts processing the PHP page, it's already passed the point where it would handle a 404
U...
map function for objects (instead of arrays)
... 'b': 4, 'c': 6 }
But you could easily iterate over an object using for ... in:
var myObject = { 'a': 1, 'b': 2, 'c': 3 };
for (var key in myObject) {
if (myObject.hasOwnProperty(key)) {
myObject[key] *= 2;
}
}
console.log(myObject);
// { 'a': 2, 'b': 4, 'c': 6 }
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What is stdClass in PHP?
...ython (Edit: but not actually used as universal base class; thanks @Ciaran for pointing this out).
It is useful for anonymous objects, dynamic properties, etc.
An easy way to consider the StdClass is as an alternative to associative array. See this example below that shows how json_decode() allow...
django.core.exceptions.ImproperlyConfigured: Error loading MySQLdb module: No module named MySQLdb
The problem Im facing while trying to connect to database for mysql. I have also given the database settings that i have used.
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Does R have an assert statement as in python?
...topifnot()
You may also be interested in packages like Runit and testthat for unit testing.
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