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Amazon EC2, mysql aborting start because InnoDB: mmap (x bytes) failed; errno 12
... the crash you may need to setup a swap space for your micro instance. Actually performance wise is better to enable swap.
Steps below show how to make a swap space for your Micro instance. I assume you have AWS Account with a Micro instance running.
Run dd if=/dev/zero of=/swapfile bs=1M count=102...
What does “javascript:void(0)” mean?
...rator is often used merely
to obtain the undefined primitive
value, usually using “void(0)” (which
is equivalent to “void 0”). In these
cases, the global variable undefined
can be used instead (assuming it has
not been assigned to a non-default
value).
An explanation is provi...
How can I check if a value is a json object?
...ly string values through ajax (which can be fairly useful if you are using PHP or ASPX to process ajax requests and might or might not return JSON depending on conditions)
The solution is quite simple, you can do the following to check if it was a valid JSON return
var IS_JSON = true;
...
how to get last insert id after insert query in codeigniter active record
...
Using the mysqli PHP driver, you can't get the insert_id after you commit.
The real solution is this:
function add_post($post_data){
$this->db->trans_begin();
$this->db->insert('posts',$post_data);
$item_id = $this->db...
Remote debugging with Android emulator
...sh -NL 5554:localhost:5554 -L 5555:localhost:5555 myuser@remote-server
killall adb; adb devices
I believe the emulator tries to notify a local adb server at startup; hence the need to restart adb in order for it to probe the local 5554+ ports.
Note that the localhost in the ssh command refers to ...
How to run a background task in a servlet based web application?
... your job here which should run every 5 seconds.
}
}
Yes, that's really all. The container will automatically pickup and manage it.
EJB unavailable? Use ScheduledExecutorService
If your environment doesn't support EJB (i.e. you're not using not a real Java EE server, but a barebones servle...
How do I use regex in a SQLite query?
...
A SQLite UDF in PHP/PDO for the REGEXP keyword that mimics the behavior in MySQL:
$pdo->sqliteCreateFunction('regexp',
function ($pattern, $data, $delimiter = '~', $modifiers = 'isuS')
{
if (isset($pattern, $data) === tr...
Assign output of os.system to a variable and prevent it from being displayed on the screen [duplicat
...ne("cat /etc/services")
print cmdline('ls')
print cmdline('rpm -qa | grep "php"')
print cmdline('nslookup google.com')
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jquery $(window).height() is returning the document height
...
With no doctype tag, Chrome reports the same value for both calls.
Adding a strict doctype like <!DOCTYPE html> causes the values to work as advertised.
The doctype tag must be the very first thing in your document. E.g., you can't have any text before it, even if it doesn't re...
Commenting multiple lines in DOS batch file
...
Wow, didn't know notepad++ has such a nice feature! Actually really missed it because I'm used to `Ctrl+7' in Eclipse. Voted up to 42 ;)
– Danny Lo
Dec 6 '15 at 14:45
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