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How can I suppress column header output for a single SQL statement?
...)
Credit to ErichBSchulz for pointing out the -N alias.
To remove the grid (the vertical and horizontal lines) around the results use -s (--silent). Columns are separated with a TAB character.
mysql -s ...
use testdb;
select * from names;
id name
1 pete
2 john
3 mike
To output the data...
C# catch a stack overflow exception
I have a recursive call to a method that throws a stack overflow exception. The first call is surrounded by a try catch block but the exception is not caught.
...
When is del useful in python?
...can create a variable name by writing a=1, it is nice that you can theoretically undo this by deleting a.
It can make debugging easier in some cases as trying to access a deleted variable will raise an NameError.
You can delete class instance attributes
Python lets you write something like:
clas...
No connection could be made because the target machine actively refused it?
... a parameter on the listen function - all languages and platforms have basically the same API in this regard, even the C# one. This parameter is often configurable if you control the server, and is likely read from some settings file or the registry. Investigate how to configure your server.
If y...
Accessing JPEG EXIF rotation data in JavaScript on the client side
...readAsArrayBuffer(file);
}
// usage:
var input = document.getElementById('input');
input.onchange = function(e) {
getOrientation(input.files[0], function(orientation) {
alert('orientation: ' + orientation);
});
}
<input id='input' type='file' />
values:
-2: n...
How can I do an asc and desc sort using underscore.js?
... Why would you think it's bubble sort? Under the hood .sortBy() calls built-in Array.sort(), the algorithm of which is up to the browser vendors, but bubble sort is pretty unlikely to be their choice.
– Rene Saarsoo
Dec 11 '15 at 19:38
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Getting the class name from a static method in Java
...
What if I'm calling the static method in a subclass, and I want the subclass name?
– Edward Falk
Oct 26 '12 at 15:49
...
JUnit test for System.out.println()
...n outputs the version string, etc etc)
Edit:
Prior versions of this answer called System.setOut(null) after the tests; This is the cause of NullPointerExceptions commenters refer to.
share
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improve...
What does void* mean and how to use it?
... a pointer to a function that compares two elements of the array. It gets called like so:
int iArr[10];
double dArr[30];
long lArr[50];
...
qsort(iArr, sizeof iArr/sizeof iArr[0], sizeof iArr[0], compareInt);
qsort(dArr, sizeof dArr/sizeof dArr[0], sizeof dArr[0], compareDouble);
qsort(lArr, sizeo...
bpftrace教程【官方】 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...内建变量，代表当前进程的名字。其它类似的变量还有pid和tid，分别表示进程标识和线程标识。
args是一个指针，指向该tracepoint的参数。这个结构时由bpftrace根据tracepoint信息自动生成的。这个结构的成员可以通过命令bpftrace -vl t...