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Find the host name and port using PSQL commands
I have PSQL running, and am trying to get a perl application connecting to the database. Is there a command to find the current port and host that the database is running on?
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How to check if a particular service is running on Ubuntu
...ed Hat Linux you can see all running services by running the following command:
service --status-all
On the list the + indicates the service is running, - indicates service is not running, ? indicates the service state cannot be determined.
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What is the difference between . (dot) and $ (dollar sign)?
...fore cannot be used with the . operator.
show can take an Int and return a String.
putStrLn can take a String and return an IO ().
You can chain show to putStrLn like this:
(putStrLn . show) (1 + 1)
If that's too many parentheses for your liking, get rid of them with the $ operator:
putStrLn ....
vector vs. list in STL
... It doesn't even have to be an UglyBlob -- even an objects with just a few string members can easily be prohibitively expensive to copy, so the reallocations will cost. Also: Don't neglect the space overhead the exponential growth of a vector holding objects of a few dozen bytes in size can cause (i...
What is Python buffer type for?
...00634ab0>
>>> print t
world
The buffer in this case is a sub-string, starting at position 6 with length 5, and it doesn't take extra storage space - it references a slice of the string.
This isn't very useful for short strings like this, but it can be necessary when using large amount...
C++ multiline string literal
...
Well ... Sort of. The easiest is to just use the fact that adjacent string literals are concatenated by the compiler:
const char *text =
"This text is pretty long, but will be "
"concatenated into just a single string. "
"The disadvantage is that you have to quote "
"each part, and n...
How to create a SQL Server function to “join” multiple rows from a subquery into a single delimited
...
Note that Matt's code will result in an extra comma at the end of the string; using COALESCE (or ISNULL for that matter) as shown in the link in Lance's post uses a similar method but doesn't leave you with an extra comma to remove. For the sake of completeness, here's the relevant code from L...
Convert Iterator to ArrayList
...
You can copy an iterator to a new list like this:
Iterator<String> iter = list.iterator();
List<String> copy = new ArrayList<String>();
while (iter.hasNext())
copy.add(iter.next());
That's assuming that the list contains strings. There really isn't a faster way t...
Is there a simple way to convert C++ enum to string?
... I usually prefer the following method, so that it's possible to tweak the string a bit.
#define X(a, b) a,
#define X(a, b) b,
X(Red, "red")
X(Green, "green")
// etc.
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How to use dashes in HTML-5 data-* attributes in ASP.NET MVC
...keyword = Model.Keyword, page = Model.currPage - 1},
new Dictionary<string,Object> { {"class","prev"}, {"data-details","yada"} } )%>
// 2: pass custom type decorated with descriptor attributes
public class CustomArgs
{
public CustomArgs( string className, string dataDetails ) { ......