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Postgres unique constraint vs index
...(ind_id)=(0) already exists.
test=#
It works as expected!
Foreign keys
Now we'll define detail table with two foreign keys referencing to our two columns in master.
create table detail (
con_id integer,
ind_id integer,
constraint detail_fk1 foreign key (con_id) references master(con...
Deep cloning objects
...ing signature:
public static T Clone<T>(this T source)
{
//...
}
Now the method call simply becomes objectBeingCloned.Clone();.
EDIT (January 10 2015) Thought I'd revisit this, to mention I recently started using (Newtonsoft) Json to do this, it should be lighter, and avoids the overhead o...
Is there a download function in jsFiddle?
...
@LeosLiterak updated. and thanks for reminding so that now the answer will be more clear for any.
– Pradeep Kumar Prabaharan
Apr 6 '17 at 12:06
add a comme...
jQuery.ajax handling continue responses: “success:” vs “.done”?
I have been working with jQuery and AJAX for a few weeks now and I saw two different ways to 'continue' the script once the call has been made: success: and .done .
...
Understanding Fragment's setRetainInstance(boolean)
...
First of all, check out my post on retained Fragments. It might help.
Now to answer your questions:
Does the fragment also retain its view state, or will this be recreated on configuration change - what exactly is "retained"?
Yes, the Fragment's state will be retained across the configura...
Are there disadvantages to using a generic varchar(255) for all text-based fields?
...ng, this can make the temporary table very large.
You may also like to know that this "padding out" behavior means that a string declared with the utf8 character set pads out to three bytes per character even for strings you store with single-byte content (e.g. ascii or latin1 characters). And l...
How can I recover a lost commit in Git?
...
Just to mention: if you know the branch name: git reflog <branchname> can be quite useful, since you see the changes of just one branch.
– Markus Schreiber
Jun 9 at 13:47
...
How can I change Mac OS's default Java VM returned from /usr/libexec/java_home
..."Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home
Now you will need to logout/login and then:
java -version
java version "1.7.0_45"
:-)
Of course I have no idea if something else breaks now or if the 1.8.0-ea version of java still works correctly.
You probably should no...
Difference between partition key, composite key and clustering key in Cassandra?
... This was confused me for few days, thanks for this answer, now I'm able to build the data model in my head.
– Roger Dwan
Jan 7 '16 at 9:27
2
...
How do I parse command line arguments in Bash?
...--default)
DEFAULT=YES
shift # past argument
;;
*) # unknown option
POSITIONAL+=("$1") # save it in an array for later
shift # past argument
;;
esac
done
set -- "${POSITIONAL[@]}" # restore positional parameters
echo "FILE EXTENSION = ${EXTENSION}"
echo "SEARCH PATH ...