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How to 'insert if not exists' in MySQL?
I started by googling, and found this article which talks about mutex tables.
10 Answers
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剖析程序的内存布局 - C/C++ - 清泛网 - 专注C/C++及内核技术
...、栈之类的。记住，这些段只是简单的内存地址范围，与Intel处理器的段没有关系。不管怎样，下面是一个Linux进程的标准的内存段布局：
当计算机开心、安全、可爱、正常的运转时，几乎每一个进程的各个段的起始...
namedtuple and default values for optional keyword arguments
I'm trying to convert a longish hollow "data" class into a named tuple. My class currently looks like this:
21 Answers
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How to know user has clicked “X” or the “Close” button?
... get it through the sender object. Try to cast sender as a Button control, and verify perhaps for its name "CloseButton", for instance.
private void Form1_FormClosing(object sender, FormClosingEventArgs e) {
if (string.Equals((sender as Button).Name, @"CloseButton"))
// Do something pro...
multiprocessing: How do I share a dict among multiple processes?
...pool.map(f, repeat(d, 10))
# `d` is a DictProxy object that can be converted to dict
pprint.pprint(dict(d))
Output:
$ python3 mul.py
{22562: 'Hi, I was written by process 22562',
22563: 'Hi, I was written by process 22563',
22564: 'Hi, I was written by process 22564',
22565: '...
PHP function to make slug (URL string)
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iconv will not convert correctly if $text contains characters that don't have ascii equivalent. For example iconv('utf-8', 'us-ascii//TRANSLIT', "EFI收购Cretaprint") will return "EFI" and leak a warning.
– Kendall Ho...
Sass calculate percent minus px
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Sass cannot perform arithmetic on values that cannot be converted from one unit to the next. Sass has no way of knowing exactly how wide "100%" is in terms of pixels or any other unit. That's something only the browser knows.
You need to use calc() instead. Check browser compa...
Ruby regular expression using variable name
...It used to be that a string replacement argument to gsub was automatically converted to a regular expression. I know it was that way in 1.6. I don't recall which version introduced the change).
As noted in other answers, you can use Regexp.new as an alternative to interpolation:
var = "*This*"
s...
PHP function overloading
... overload PHP functions. Function signatures are based only on their names and do not include argument lists, so you cannot have two functions with the same name. Class method overloading is different in PHP than in many other languages. PHP uses the same word but it describes a different pattern.
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How to compare two dates?
...time(date1, "%d/%m/%Y") and newdate2 = time.strptime(date2, "%d/%m/%Y") to convert them to python's date format. Then, the comparison is obvious:
newdate1 > newdate2 will return False
newdate1 < newdate2 will return True
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