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Ruby on Rails: How do I add a not null constraint to an existing column using a migration?
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@NicNilov no dw I did think that though I just wanted to double check :)
– Mark
Dec 28 '17 at 20:04
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Static fields on a null reference in Java
... static way". At least those of us picky about warnings (like me) would avoid such code.
– Artyom
Jul 25 '12 at 14:25
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What is the best way to count “find” results?
...on? Your original solution is spawning a new process printf for every individual file found, and that's very expensive (as you've just found).
Note that this will overcount if you have filenames with newlines embedded, but if you have that then I suspect your problems run a little deeper.
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How can I install MacVim on OS X?
...mpile it (requiring the 4+ GB download of Xcode). Is this answer still valid?
– Wildcard
Sep 24 '16 at 9:46
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How to execute a java .class from the command line
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You have no valid main method... The signature should be:
public static void main(String[] args);
Hence, in your case the code should look like this:
public class Echo {
public static void main (String[] arg) {
System.out...
SQL query to get all values a enum can have
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Try:
SELECT e.enumlabel
FROM pg_enum e
JOIN pg_type t ON e.enumtypid = t.oid
WHERE t.typname = 'myenum'
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Difference between jQuery’s .hide() and setting CSS to display: none
Which am I better off doing? .hide() is quicker than writing out .css("display", "none") , but what’s the difference and what are both of them actually doing to the HTML element?
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What is the difference between Amazon S3 and Amazon EC2 instance?
... answered Jan 18 '13 at 4:28
David LevesqueDavid Levesque
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POST request send json data java HttpUrlConnection
... nothing is working for me. I am sending the input but at API side I am receiving blank.
– Adarsh Singh
May 28 at 19:46
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What is the volatile keyword useful for?
...ticle on a Singleton Pattern has changed a lot since and doesn't feature said volatile example any longer. It can be found in an archived version.
– bskp
Sep 23 '16 at 12:26
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