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Do you (really) write exception safe code? [closed]
...tion-safe code in C++ is not so much about using lots of try { } catch { } blocks. It's about documenting what kind of guarantees your code provides.
I recommend reading Herb Sutter's Guru Of The Week series, in particular installments 59, 60 and 61.
To summarize, there are three levels of excepti...
JPA getSingleResult() or null
...andling for no real benefit. You just have to wrap the code in a try-catch block.
Alternatively you can query for a list and see if its empty. That doesn't throw an exception. Actually since you're not doing a primary key lookup technically there could be multiple results (even if one, both or the ...
how to run two commands in sudo?
... can run two Db2 commands from a command line? (They will be called from a PHP exec command.)
10 Answers
...
Responsive css background images
...is sass mixin for responsive background image that I use. It works for any block element. Of course the same can work in plain CSS you will just have to calculate padding manually.
@mixin responsive-bg-image($image-width, $image-height) {
background-size: 100%;
height: 0;
padding-bottom: perc...
Is there any method to get the URL without query string?
I have a URL like http://localhost/dms/mduserSecurity/UIL/index.php?menu=true&submenu=true&pcode=1235 .
14 Answers...
Postgres could not connect to server
...
Had a similar problem; a pid file was blocking postgres from starting up. To fix it:
$ rm /usr/local/var/postgres/postmaster.pid
$ brew services restart postgresql
and then all is well.
...
Load RSA public key from file
...} catch (InvalidKeyException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
File file=new File(filename);
try {
file.createNewFile();
FileOutputStream fos=new FileOutputStream(file);
fos.write(pempri...
How to wait in a batch script? [duplicate]
...ot exist in the real world. Quoting from the spec:
192.0.2.0/24 - This block is assigned as "TEST-NET" for use in
documentation and example code. It is often used in conjunction with
domain names example.com or example.net in vendor and protocol
documentation. Addresses within this block...
IntelliJ IDEA way of editing multiple lines
...espective line.
On Linux (NO MOUSE NEEDED):
ALT + SHIFT + INSERT to enter block-mode
SHIFT + UP or SHIFT + DOWN to select multiple lines
END to jump to the end of each line
now type foo, it will append it to each line:
Now deselect everything with ESCAPE and switch back to normal selection ...
When monkey patching an instance method, can you call the overridden method from the new implementat
...get a hold of the method as an actual object, and we use a closure (i.e. a block) to make sure that we and only we hold on to that object:
class Foo
def bar
'Hello'
end
end
class Foo
old_bar = instance_method(:bar)
define_method(:bar) do
old_bar.bind(self).() + ' World'
end
end...