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How do ACID and database transactions work?
...ns that you can guarantee that all of a transaction happens, or none of it does; you can do complex operations as one single unit, all or nothing, and a crash, power failure, error, or anything else won't allow you to be in a state in which only some of the related changes have happened.
Consistenc...
Why are these numbers not equal?
...ual(...)).
if(isTRUE(all.equal(i,0.15))) cat("i equals 0.15") else cat("i does not equal 0.15")
yields
i equals 0.15
Some more examples of using all.equal instead of == (the last example is supposed to show that this will correctly show differences).
0.1+0.05==0.15
#[1] FALSE
isTRUE(all.equal...
performSelector may cause a leak because its selector is unknown
...assumes that the return value of the method it's calling is an object, but does not retain/release it. So you could end up creating a leak if your object is supposed to be released as in #3 above (that is, the method you're calling returns a new object).
For selectors you're trying to call that ret...
Copy a variable's value into another
...
It's important to understand what the = operator in JavaScript does and does not do.
The = operator does not make a copy of the data.
The = operator creates a new reference to the same data.
After you run your original code:
var a = $('#some_hidden_var').val(),
b = a;
a and b a...
Keep SSH session alive [closed]
...loses the connection from the server-side if the client goes silent (i.e., does not send information). To prevent connection loss, instruct the ssh client to send a sign-of-life signal to the server once in a while.
The configuration for this is in the file $HOME/.ssh/config, create the file if it ...
FormsAuthentication.SignOut() does not log the user out
...onger has the key, he cannot get in.
However, if Joe ever comes back, and does have that lost key, he is let back in!
From what I can tell, there is no way to tell ASP.NET to change the lock on the door!
The way I can live with this is to remember Joe's name in a Session variable. When he logs ou...
Does a finally block run even if you throw a new Exception?
...nally block to be skipped, whether thrown from the try or the catch block. Does this use "interrupted" to mean something more violent, like Thread.stop()?
– Joe Kearney
Nov 24 '10 at 9:13
...
In PHP, why does not show a parse error?
...gin', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f13228306%2fin-php-why-does-script-not-show-a-parse-error%23new-answer', 'question_page');
}
);
Post as a guest
...
How to identify server IP address in PHP
...
This does not give the server ip. For some reason it is giving my local ip
– Thomas Williams
Jun 28 '17 at 15:11
...
Why does gulp.src not like being passed an array of complete paths to files?
...n array of full paths, each file is processed independently. The globbing doesn't know where the root of the path is (in fact, it guesses based on the first glob). Therefore, each file is rooted in the folder it contains, and the relative path is empty.
However, there is an easy solution. Pass a...