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What's the best practice for primary keys in tables?
When designing tables, I've developed a habit of having one column that is unique and that I make the primary key. This is achieved in three ways depending on requirements:
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Change Image of ImageView programmatically in Android
...und.
Use this instead:
qImageView.setBackgroundResource(R.drawable.thumbs_down);
Here's a thread that talks about the differences between the two methods.
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Scale image to fit a bounding box
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Test it here: http://www.w3schools.com/cssref/playit.asp?filename=playcss_background-size&preval=contain
Full compatibility with latest browsers: http://caniuse.com/background-img-opts
To align the div in the center, you can use this variation:
.bounding-box {
background-image: url(...);
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Detect if an input has text in it using CSS — on a page I am visiting and do not control?
...he javascript solution at this jsBin page.
// ==UserScript==
// @name _Dynamically style inputs based on whether they are blank.
// @include http://YOUR_SERVER.COM/YOUR_PATH/*
// @grant GM_addStyle
// ==/UserScript==
/*- The @grant directive is needed to work around a design change
intr...
JPA EntityManager: Why use persist() over merge()?
EntityManager.merge() can insert new objects and update existing ones.
15 Answers
15
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What is the difference between integration and unit tests?
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ShellZero
3,09544 gold badges3232 silver badges4949 bronze badges
answered Sep 1 '08 at 19:33
Larry FoulkrodLarry Foulkrod
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What is the best way to get all the divisors of a number?
...ed insecure.
Python code:
import math
def divisorGenerator(n):
large_divisors = []
for i in xrange(1, int(math.sqrt(n) + 1)):
if n % i == 0:
yield i
if i*i != n:
large_divisors.append(n / i)
for divisor in reversed(large_divisors):
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How do browser cookie domains work?
Due to weird domain/subdomain cookie issues that I'm getting, I'd like to know how browsers handle cookies. If they do it in different ways, it would also be nice to know the differences.
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Java: Integer equals vs. ==
...ison with == only works for numbers between -128 and 127.
Refer: #Immutable_Objects_.2F_Wrapper_Class_Caching
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