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Multiple Updates in MySQL
...SERT ... ON DUPLICATE KEY UPDATE.
Using your example:
INSERT INTO table (id,Col1,Col2) VALUES (1,1,1),(2,2,3),(3,9,3),(4,10,12)
ON DUPLICATE KEY UPDATE Col1=VALUES(Col1),Col2=VALUES(Col2);
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What is a method that can be used to increment letters?
...ted 2019/05/09)
Since this answer has received so much visibility I've decided to expand it a bit beyond the scope of the original question to potentially help people who are stumbling on this from Google.
I find that what I often want is something that will generate sequential, unique strings in ...
Appending an element to the end of a list in Scala
...ointer to the head and the tail. However, the list in scala is immutable, meaning that to "modify" the last element of the list one needs to make a copy of it first. Its the copy that is O(n) - not the traversal of the list itself.
– user289086
Nov 8 '13 at 1...
What does middleware and app.use actually mean in Expressjs?
...an connect) you have global middleware and route specific middleware. This means you can attach a middleware stack to every incoming HTTP requests or only attach it to HTTP requests that interact with a certain route.
Advanced examples of express & middleware :
// middleware
var stack = midd...
Using “label for” on radio buttons
...lmost got it. It should be this:
<input type="radio" name="group1" id="r1" value="1" />
<label for="r1"> button one</label>
The value in for should be the id of the element you are labeling.
sh...
Grep only the first match and stop
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-m 1 means return the first match in any given file. But it will still continue to search in other files. Also, if there are two or more matched in the same line, all of them will be displayed.
You can use head -1 to solve this p...
Escape string for use in Javascript regex [duplicate]
...g) {
return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'); // $& means the whole matched string
}
Example
escapeRegExp("All of these should be escaped: \ ^ $ * + ? . ( ) | { } [ ]");
>>> "All of these should be escaped: \\ \^ \$ \* \+ \? \. \( \) \| \{ \} \[ \] "
(NOTE: the ...
Negative list index? [duplicate]
...
Negative numbers mean that you count from the right instead of the left. So, list[-1] refers to the last element, list[-2] is the second-last, and so on.
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Sorting a set of values [closed]
... doesn't like to misuse common terms". In a language where "non-modifying" means "mutating", it's not surprising that set means "sorted list", and you have to say unordered_set to mean "set"…
– abarnert
Jul 3 '13 at 21:33
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warning RC2182: duplicate dialog control ID 1002 - C/C++ - 清泛网 - 专注C/C++及内核技术
warning RC2182: duplicate dialog control ID 1002原因：报错行的控件ID值（这里是1002），与其他的控件ID值一样，发生冲突了。解决：resource.h中将值一样的控件ID改为不同的值。原因：报错行的控件ID值（这里是1002），与其他的控件ID值一...