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Are PostgreSQL column names case-sensitive?
...ame" = 'xyz';
Also fix the incorrect double-quotes around 'xyz'. Values (string literals) are enclosed in single quotes.
Read the manual here.
My standing advice is to use legal, lower-case names exclusively so double-quoting is not needed.
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C#: List All Classes in Assembly
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Use Assembly.GetTypes. For example:
Assembly mscorlib = typeof(string).Assembly;
foreach (Type type in mscorlib.GetTypes())
{
Console.WriteLine(type.FullName);
}
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improve thi...
What exceptions should be thrown for invalid or unexpected parameters in .NET?
...rown when the format of an argument is invalid, or when a composite format string is not well formed.
– Anthony
Sep 11 '18 at 0:58
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Does using final for variables in Java improve garbage collection?
...e improvement. This is used when you have a number of public static final Strings in a class.
In general, the compiler and runtime will optimize where it can. It is best to write the code appropriately and not try to be too tricky. Use final when you do not want the variable to be modified. Ass...
Passing command line arguments to R CMD BATCH
...CH -blabla my_script.R
commandArgs() will receive -blabla as a character string in this case. See the help for details:
$ R CMD BATCH --help
Usage: R CMD BATCH [options] infile [outfile]
Run R non-interactively with input from infile and place output (stdout
and stderr) to another file. If not ...
Check if value is in select list with JQuery
...ues containing any character, including ] and `\`. Avoid building selector strings from raw text without doing proper CSS-escaping.
– bobince
Feb 12 '10 at 1:28
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Spring classpath prefix difference
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The source code of Spring:
public Resource[] getResources(String locationPattern) throws IOException {
Assert.notNull(locationPattern, "Location pattern must not be null");
//CLASSPATH_ALL_URL_PREFIX="classpath*:"
if (locationPattern.startsWith(CLASSPATH_ALL_URL_PREFIX)) {
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multiprocessing: How do I share a dict among multiple processes?
...of memory and doesn't work for Mac OS. Though my dict only works for plain strings and is immutable currently.
I use linear probing implementation and store keys and values pairs in a separate memory block after the table.
from mmap import mmap
import struct
from timeit import default_timer
from mu...
ThreadStatic v.s. ThreadLocal: is generic better than attribute?
... [ThreadStatic]
static int value = 10;
static void Main(string[] args)
{
value = 25;
Task t1 = Task.Run(() =>
{
value++;
Console.WriteLine("T1: " + value);
});
Task t2 = Task.Ru...
Redirect STDERR / STDOUT of a process AFTER it's been started, using command line?
...ated. To control that use the -s parameter that sets the maximum length of strings displayed.
It catches all streams, so you might want to filter that somehow:
strace -ewrite -p $PID 2>&1 | grep "write(1"
shows only descriptor 1 calls. 2>&1 is to redirect STDERR to STDOUT, as str...