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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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Using numpad in Vi (Vim) via PuTTY
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+100
The answer is in Numpad in PuTTY while using vi [Cialug]:
In the configuration, go to Terminal->Features and check "Disable
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Playing .mp3 and .wav in Java?
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120
Java FX has Media and MediaPlayer classes which will play mp3 files.
Example code:
String bip...
三个退出程序消息：WM_CLOSE、WM_DESTROY、WM_QUIT区别 - C/C++ - 清泛网 -...
...消息循环终止，然后程序结束。
3、退出程序语句
exit(0);
postquitmessage(0);
onok();oncancel();
sendmessage(wm_close,0,0);
exitprocess(0);
其中以exit(0)最为迅速，在实践方面
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How can I convert a PFX certificate file for use with Apache on a linux server?
...ey.
Update your Apache configuration file with:
<VirtualHost 192.168.0.1:443>
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SSLEngine on
SSLCertificateFile /path/to/domain.cer
SSLCertificateKeyFile /path/to/domain.key
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</VirtualHost>
share
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Using FileSystemWatcher to monitor a directory
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edited Mar 6 '13 at 16:06
Neolisk
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answere...
Get the current file name in gulp.src()
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edited May 22 '14 at 22:40
answered May 22 '14 at 22:34
Vi...
Equivalent of “continue” in Ruby
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Yes, it's called next.
for i in 0..5
if i < 2
next
end
puts "Value of local variable is #{i}"
end
This outputs the following:
Value of local variable is 2
Value of local variable is 3
Value of local variable is 4
Value of local variable ...
List files committed for a revision
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phihagphihag
239k6060 gold badges406406 silver badges444444 bronze badges
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UUID max character length
...s but we have noticed UUID'S generated which are longer than this - up to 60 characters in length.
Does anyone know a suitable max char length for UUID??
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