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Remove the last character in a string in T-SQL?
...ng = ''
SELECT LEFT(@String, LEN(@String) - 1)
then this code will cause error message 'Invalid length parameter passed to the substring function.'
You can handle it this way:
SELECT LEFT(@String, NULLIF(LEN(@String)-1,-1))
It will always return result, and NULL in case of empty string.
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How should I log while using multiprocessing in Python?
...w uses a queue for correct handling of concurrency, and also recovers from errors correctly. I've now been using this in production for several months, and the current version below works without issue.
from logging.handlers import RotatingFileHandler
import multiprocessing, threading, logging, sy...
How to wait in bash for several subprocesses to finish and return exit code !=0 when any subprocess
...ions {}
GNU Parallel will give you exit code:
0 - All jobs ran without error.
1-253 - Some of the jobs failed. The exit status gives the number of failed jobs
254 - More than 253 jobs failed.
255 - Other error.
Watch the intro videos to learn more: http://pi.dk/1
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Running multiple TeamCity Agents on the same computer?
...vise that you may have an issue with the new agent after installing it, an error like "Teamcity agent in disconnected state (Agent has unregistered (will upgrade))". This can be solved stopping the fisrt agent(or the other agents installed) and restarting the new from the services (on Windows/Window...
When should static_cast, dynamic_cast, const_cast and reinterpret_cast be used?
...ructor, or A doesn't have a conversion operator, then you get compile time error.
Cast from A* to B* always succeeds if A and B are in inheritance hierarchy (or void) otherwise you get compile error.
Gotcha: If you cast base pointer to derived pointer but if actual object is not really derived type...
Why does Ruby have both private and protected methods?
... # true
gimli.name # 'Gimli'
gimli.age # NoMethodError: private method `age'
called for #<Dwarf:0x007ff552140128>
gimli.beard_strength # NoMethodError: protected method `beard_strength'
called for #<Dwarf:0x007ff552...
BASH copy all files except one
...
This is more likely to produce errors than do what you intend.
– Paused until further notice.
Aug 22 '09 at 1:40
...
What is output buffering?
...example:
<?php
ob_start( );
echo "Hello World";
if ( $some_error )
{
header( "Location: error.php" );
exit( 0 );
}
?>
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What is the difference between canonical name, simple name and class name in Java Class?
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Efficient way to return a std::vector in c++
...s "return by value" might be, it's the kind of code that can lead one into error. Consider the following program:
#include <string>
#include <vector>
#include <iostream>
using namespace std;
static std::vector<std::string> strings;
std::vector<std...