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@Basic(optional = false) vs @Column(nullable = false) in JPA
...ipseLink Architecture Committee Member, TopLink Core Technical Lead, JPA 2.0 Expert Group Member) wrote a good answer on this topic so instead of paraphrasing him, I'll quote his answer:
The difference between optional and
nullable is the scope at which they
are evaluated. The definition of
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How to print matched regex pattern using awk?
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This is the very basic
awk '/pattern/{ print $0 }' file
ask awk to search for pattern using //, then print out the line, which by default is called a record, denoted by $0. At least read up the documentation.
If you only want to get print out the matched word.
awk '...
Proper package naming for testing with the Go language
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answered Jul 16 '15 at 0:02
Matthew RankinMatthew Rankin
383k3636 gold badges111111 silver badges151151 bronze badges
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Disabling browser caching for all browsers from ASP.NET
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answered May 27 '09 at 22:39
HttpWatchSupportHttpWatchSupport
2,7881414 silver badges1515 bronze badges
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LEGO EV3 机器人传感器面板 · App Inventor 2 中文网
...能说明
颜色传感器
输出光线强度（0-100）或物体颜色代码
超声波传感器
测量距离（厘米/英寸）
红外传感器
接收红外遥控器消息
触碰传感器
二进制按下/...
Why use symbols as hash keys in Ruby?
...shed keys" against each other.
Long answer:
https://web.archive.org/web/20180709094450/http://www.reactive.io/tips/2009/01/11/the-difference-between-ruby-symbols-and-strings
http://www.randomhacks.net.s3-website-us-east-1.amazonaws.com/2007/01/20/13-ways-of-looking-at-a-ruby-symbol/
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Spring 3 MVC accessing HttpRequest from controller
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edited Oct 31 '18 at 20:53
anir
1,47555 silver badges2222 bronze badges
answered Dec 14 '11 at 12:19...
What is the correct way to get a subarray in Scala?
...head.
– Amir A. Shabani
Sep 8 at 16:00
add a comment
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What’s the difference between “Array()” and “[]” while declaring a JavaScript array?
...hese are the same
b = new Array(), // a and b are arrays with length 0
c = ['foo', 'bar'], // these are the same
d = new Array('foo', 'bar'), // c and d are arrays with 2 strings
// these are different:
e = [3] // e.length == 1, e[0] == 3
f = new Ar...
Getting number of elements in an iterator in Python
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101
No. It's not possible.
Example:
import random
def gen(n):
for i in xrange(n):
if...