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What do the plus and minus signs mean in Objective-C next to a method?
...ass methods:-
Are methods which are declared as static. The method can be called without creating an instance of the class. Class methods can only operate on class members and not on instance members as class methods are unaware of instance members. Instance methods of the class can also not be cal...
Possibility of duplicate Mongo ObjectId's being generated in two different collections?
...ique ID (please let me know if there are more):
Before this discussion, recall that the BSON Object ID consists of:
[4 bytes seconds since epoch, 3 bytes machine hash, 2 bytes process ID, 3 bytes counter]
Here are the three possibilities, so you judge for yourself how likely it is to get a dupe:
...
How to flatten tree via LINQ?
...<T>> f
) => e.SelectMany(c => f(c).Flatten(f)).Concat(e);
Call this function like this:
IEnumerable<MyNode> tree = ....
var res = tree.Flatten(node => node.Elements);
If you would prefer flattening in pre-order rather than in post-order, switch around the sides of the Co...
How to set background color of an Activity to white programmatically?
How can I set the background color of an Activity to white programatically?
11 Answers
...
Postgres: INSERT if does not exist already
... FROM invoices
);
$$
LANGUAGE 'sql';
and just call it:
SELECT fn_upd_invoices('12345', 'TRUE')
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AJAX Mailchimp signup form integration
...form action url. Use dataType: 'jsonp' and jsonp: 'c' for Your jQuery ajax call.
– czerasz
Sep 5 '13 at 12:41
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MongoDB SELECT COUNT GROUP BY
...
I wonder why it's called "sum" rather than "count"
– Royi Namir
Aug 19 at 18:50
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how to deal with google map inside of a hidden div (Updated picture)
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So basically you only instantialize the map when the div is shown? Is there any way to do this so that the map object is only instantialized once (on page load)?
– lucas
Feb 14 '17 at 12:13
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Checking for a null int value from a Java ResultSet
...t if the field value is NULL, I suggest:
int iVal = 0;
ResultSet rs = magicallyAppearingStmt.executeQuery(query);
if (rs.next()) {
iVal = rs.getInt("ID_PARENT");
if (rs.wasNull()) {
// handle NULL field value
}
}
(Edited as @martin comments below; the OP code as written would ...
How to use setArguments() and getArguments() methods in Fragments?
...
You have a method called getArguments() that belongs to Fragment class.
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