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What is the difference between ExecuteScalar, ExecuteReader and ExecuteNonQuery?
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ExecuteScalar is typically used when your query returns a single value. If it returns more, then the result is the first column of the first row. An example might be SELECT @@IDENTITY AS 'Identity'.
ExecuteReader is used for any result se...
Accessing class variables from a list comprehension in the class definition
How do you access other class variables from a list comprehension within the class definition? The following works in Python 2 but fails in Python 3:
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Is it unnecessary to put super() in constructor?
Isn't this one automatically put by the compiler if I don't put it in a subclass's constructor?
6 Answers
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What's the difference between => , ()=>, and Unit=>
...y-Name: => Type
The => Type notation stands for call-by-name, which is one of the many ways parameters can be passed. If you aren't familiar with them, I recommend taking some time to read that wikipedia article, even though nowadays it is mostly call-by-value and call-by-reference.
What it ...
Why isn't SQL ANSI-92 standard better adopted over ANSI-89?
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edited Oct 29 '19 at 21:52
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How come an array's address is equal to its value in C?
...ifferent types, so array+1 and &array+1 will not be equal if the array is more than 1 element long).
There are two exceptions to this: when the array name is an operand of sizeof or unary & (address-of), the name refers to the array object itself. Thus sizeof array gives you the size in by...
How to differentiate single click event and double click event?
...ingle button in li with id "my_id" . I attached two jQuery events with this element
18 Answers
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Proper use cases for Android UserManager.isUserAGoat()?
I was looking at the new APIs introduced in Android 4.2 .
While looking at the UserManager class I came across the following method:
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What are the differences between various threading synchronization options in C#?
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Great question. I maybe wrong.. Let me try.. Revision#2 of my orig answer.. with a little bit of more understanding. Thanks for making me read :)
lock(obj)
is a CLR construct that for (intra-object?) thread synchronization. Ensures that only one thread can take ownersh...
if a ngSrc path resolves to a 404, is there a way to fallback to a default?
...tion I'm building requires my user to set 4 pieces of information before this image even has a chance of loading. This image is the center-piece of the application, so the broken image link makes it look like the whole thing is borked. I'd like to have another image take its place on a 404.
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