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Get users by name property using Firebase
...hild attribute (for example, all users with name === "Alex").
In October 2014, Firebase rolled out new querying functionality via the orderByChild() method, that enables you to do this type of query quickly and efficiently. See the updated answer below.
When writing data to Firebase, you have a...
How to git-cherry-pick only changes to certain files?
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answered Apr 19 '11 at 14:04
CascabelCascabel
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Match whitespace but not newlines
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Perl versions 5.10 and later support subsidiary vertical and horizontal character classes, \v and \h, as well as the generic whitespace character class \s
The cleanest solution is to use the horizontal whitespace character class \h. This wil...
Why wasn't PyPy included in standard Python?
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PyPy is not a fork of CPython, so it could never be merged directly into CPython.
Theoretically...
Most efficient way to check for DBNull and then assign to a variable?
...ion instead.
On an unrelated note, here's a VB.NET alternative to Stevo3000's suggestion:
oSomeObject.IntMember = If(TryConvert(Of Integer)(oRow("Value")), iDefault)
oSomeObject.StringMember = If(TryCast(oRow("Name"), String), sDefault)
Function TryConvert(Of T As Structure)(ByVal obj As Object...
Difference between Visual Basic 6.0 and VBA
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For nearly all programming purposes, VBA and VB 6.0 are the same thing.
VBA cannot compile your program into an executable binary. You'll always need the host (a Word file and MS Word, for example) to contain and execute your project. You'll also not be able to create COM D...
Managing CSS Explosion
...efine the specific characteristics of each of the three menus. Level 1 is 40 pixels tall; levels 2 and 3, 20 pixels.
Note: you could also use multiple classes for this but Internet Explorer 6 has problems with multiple classes, so this example uses ids.
div.navi ul.menu#level1 { height: 40px; }
di...
Force update of an Android app when a new version is available
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101
I agree with Scott Helme's point in another answer here. But in some extreme situations (securi...
Cross field validation with Hibernate Validator (JSR 303)
...field validation should be done at the class level. Additionally, the JSR-303 Section 2.2 preferred way to express multiple validations of the same type is via a list of annotations. This allows the error message to be specified per match.
For example, validating a common form:
@FieldMatch.List(...