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How do you query for “is not null” in Mongo?
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One liner is the best :
db.mycollection.find({ 'fieldname' : { $exists: true, $ne: null } });
Here,
mycollection : place your desired collection name
fieldname : place your desired field name
Explaination :
$exists :...
android asynctask sending callbacks to ui [duplicate]
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@JacksOnF1re for the one hand - it should, of course. For the other hand, I think this would significantly complicate the answer, because I assume that it's primarily read by Android newcomers. Lastly, I don't think AsyncTask is a good thing to g...
Is there a list of Pytz Timezones?
I would like to know what are all the possible values for the timezone argument in the Python library pytz. How to do it?
7...
Search text in fields in every table of a MySQL database
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One of our databases is 92.7Gb and this option worked just fine. Great solution
– Tricky
Nov 25 '13 at 14:59
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How to dismiss keyboard for UITextView with return key?
... the user hits the return key. If you want the user to be able to add only one line of text, use a UITextField. Hitting the return and hiding the keyboard for a UITextView does not follow the interface guidelines.
Even then if you want to do this, implement the textView:shouldChangeTextInRange:repl...
Is it possible to make anonymous inner classes in Java static?
...ssInside {
}
}
public class MyClass {
public void method() {
JComponent jc = new JComponent() {
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}
}
}
public class MyClass {
public static void myStaticMethod() {
JComponent jc = new JComponent() {
...
}
}
}
They are catered for in the language spec (if ...
Move the mouse pointer to a specific position?
... it. From my brief read-up, I think the idea is that it locks the mouse to one location, and reports motion events similar to click-and-drag events.
Here's the release documentation:FireFox: https://developer.mozilla.org/en-US/docs/Web/API/Pointer_Lock_APIChrome: http://www.chromium.org/developers/...
Fastest way to download a GitHub project
...age, you can press the 'Download ZIP' button which is located under the "Clone or Download" drop down:
This allows you to download the most recent version of the code as a zip archive.
If you aren't seeing that button, it is likely because you aren't on the main project page. To get there, clic...
How to switch to REPLACE mode in VIM
...ly. Pressing just R key (as you would do to type r) allows to replace just one letter and then goes back to NORMAL mode.
– Melebius
Jan 22 '14 at 7:36
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How to remove all MySQL tables from the command-line without DROP database permissions? [duplicate]
...ase when you already deleted all tables in the database by adding at least one nonexistent - "dummy" table.
And it fixed in case when you have many tables.
And This small change to drop all view exist in the Database
SET FOREIGN_KEY_CHECKS = 0;
SET GROUP_CONCAT_MAX_LEN=32768;
SET @views = NULL;
S...