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Difference between objectForKey and valueForKey?
...a collection class similar to an NSArray, except instead of using indexes, it uses keys to differentiate between items. A key is an arbitrary string you provide. No two objects can have the same key (just as no two objects in an NSArray can have the same index).
valueForKey: is a KVC method. It wo...
How do you deal with configuration files in source control?
Let's say you have a typical web app and with a file configuration.whatever. Every developer working on the project will have one version for their dev boxes, there will be a dev, prod and stage versions. How do you deal with this in source control? Not check in this file at all, check it with diffe...
SQL - Query to get server's IP address
...u have Shared Memory connections allowed, then running above on the server itself will give you
"Shared Memory" as the value for 'net_transport', and
NULL for 'local_net_address', and
'<local machine>' will be shown in 'client_net_address'.
'client_net_address' is the address of the c...
How can I format a number into a string with leading zeros?
... i.ToString("D2");
D stands for "decimal number", 2 for the number of digits to print.
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Android Get Current timestamp?
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@kjdion84 excuse me, but why do you think it would be important ? Just based on the question.
– Cԃաԃ
Aug 2 '19 at 5:55
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What is a classpath and how do I set it?
...ogramming in Java, you make other classes available to the class you are writing by putting something like this at the top of your source file:
import org.javaguy.coolframework.MyClass;
Or sometimes you 'bulk import' stuff by saying:
import org.javaguy.coolframework.*;
So later in your program...
How to convert an NSString into an NSNumber
How can I convert a NSString containing a number of any primitive data type (e.g. int , float , char , unsigned int , etc.)? The problem is, I don't know which number type the string will contain at runtime.
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Formatting Numbers by padding with leading zeros in SQL Server
...yeeId)) + EmployeeId
If the column is an INT, you can use RTRIM to implicitly convert it to a VARCHAR
SELECT REPLICATE('0',6-LEN(RTRIM(EmployeeId))) + RTRIM(EmployeeId)
And the code to remove these 0s and get back the 'real' number:
SELECT RIGHT(EmployeeId,(LEN(EmployeeId) - PATINDEX('%[^0]%'...
How to set a JavaScript breakpoint from code in Chrome?
...
You can use debugger; within your code. If the developer console is open, execution will break. It works in firebug as well.
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Counting DISTINCT over multiple columns
...mprove performance, you could try creating a persisted computed column on either a hash or concatenated value of the two columns.
Once it is persisted, provided the column is deterministic and you are using "sane" database settings, it can be indexed and / or statistics can be created on it.
I b...