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On Duplicate Key Update same as insert
I've searched around but didn't find if it's possible.
8 Answers
8
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What is the reason for performing a double fork when creating a daemon?
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Looking at the code referenced in the question, the justification is:
Fork a second child and exit immediately to prevent zombies. This
causes the second child process to be orphaned, making the init
process responsible for its cleanup. And, since the first child...
Find a pair of elements from an array whose sum equals a given number
... its index.
hash(arr[i]) = i
end-for
for i=0 to arr.length - 1 do
# if K-th element exists and it's different then we found a pair
if hash(K - arr[i]) != i
print "pair i , hash(K - arr[i]) has sum K"
end-if
end-for
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How can I convert a zero-terminated byte array to string?
... read. You should save that number and then use it to create your string. If n is the number of bytes read, your code would look like this:
s := string(byteArray[:n])
To convert the full string, this can be used:
s := string(byteArray[:len(byteArray)])
This is equivalent to:
s := string(byteArray...
How do I remove objects from a JavaScript associative array?
...ie. an array with a missing index).
When working with instances of Array, if you do not want to create a sparsely populated array - and you usually don't - then you should use Array#splice or Array#pop.
Note that the delete operator in JavaScript does not directly free memory. Its purpose is to re...
How to do ssh with a timeout in a script?
...g via password-less SSH on a remote host. I want to set a timeout, so that if the remote host is taking an infinite time to run, I want to come out of that ssh session and continue other lines in my sh script.
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What is the difference between the add and offer methods in a Queue in Java?
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I guess the difference is in the contract, that when element can not be added to collection the add method throws an exception and offer doesn't.
From: http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#add%28E%29
If a...
Is there a way to check if int is legal enum in C#?
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Check out Enum.IsDefined
Usage:
if(Enum.IsDefined(typeof(MyEnum), value))
MyEnum a = (MyEnum)value;
This is the example from that page:
using System;
[Flags] public enum PetType
{
None = 0, Dog = 1, Cat = 2, Rodent = 4, Bird = 8, Reptile = 16...
Validate a username and password against Active Directory?
...e a username and password against Active Directory? I simply want to check if a username and password are correct.
13 Answe...
Testing the type of a DOM element in JavaScript
...M element.
In that case, use the elem.tagName or elem.nodeName property.
if you want to get really creative, you can use a dictionary of tagnames and anonymous closures instead if a switch or if/else.
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