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Difference between Key, Primary Key, Unique Key and Index in MySQL
...imary key is a column, or a combination of columns, that can uniquely identify a row. It is a special case of unique key. A table can have at most one primary key, but more than one unique key. When you specify a unique key on a column, no two distinct rows in a table can have the same value.
Also ...
Synchronise ScrollView scroll positions - android
...oldx, int oldy) {
super.onScrollChanged(x, y, oldx, oldy);
if(scrollViewListener != null) {
scrollViewListener.onScrollChanged(this, x, y, oldx, oldy);
}
}
}
And we should specify this new ObservableScrollView class in the layout, instead of the existing Sc...
Unnecessary curly braces in C++?
... can hold on to some shared resource for a shorter duration than you would if you grabbed it at the start of the method.
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How do I calculate the normal vector of a line segment?
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if we define dx=x2-x1 and dy=y2-y1, then the normals are (-dy, dx) and (dy, -dx).
Note that no division is required, and so you're not risking dividing by zero.
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How to see which plugins are making Vim slow?
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If it's not clear, the resulting profile.log is a file in your Vim session's current directory.
– Micah Smith
May 10 '16 at 23:13
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An established connection was aborted by the software in your host machine
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@Nate if you restart adb as well (adb kill-server/adb start-server), does that save you from restarting the computer?
– Björn
Dec 17 '11 at 12:54
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Programmatically fire button click event?
...nswer, but more flexible as it'll keep track of the buttons actual actions if you change them or add more than one.
[button sendActionsForControlEvents:UIControlEventTouchUpInside];
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Get MD5 hash of big files in Python
...ave used hashlib (which replaces md5 in Python 2.6/3.0) and it worked fine if I opened a file and put its content in hashlib.md5() function.
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Remove the first character of a string
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python 2.x
s = ":dfa:sif:e"
print s[1:]
python 3.x
s = ":dfa:sif:e"
print(s[1:])
both prints
dfa:sif:e
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What 'sensitive information' could be disclosed when setting JsonRequestBehavior to AllowGet
.../User/GetUser/32
which returns a JSON response:
{ "Name": "John Doe" }
If this method accepts only POST requests, then the content will only be returned to the browser if an AJAX request is made to http://www.example.com/User/GetUser/32 using the POST method. Note that unless you have implemente...