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How to make connection to Postgres via Node.js
I find myself trying to create a postgres database, so I installed postgres and started a server with initdb /usr/local/pgsql/data , then I started that instance with postgres -D /usr/local/pgsql/data now how can I interact with this through node? For example, what would the connectionstring be...
SQL Group By with an Order By
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In all versions of MySQL, simply alias the aggregate in the SELECT list, and order by the alias:
SELECT COUNT(id) AS theCount, `Tag` from `images-tags`
GROUP BY `Tag`
ORDER BY theCount DESC
LIMIT 20
...
UITableView, Separator color where to set?
...ve added a UITableView in IB and set the "delegate" and "datasource" and all is working well. What I wanted to do next was change the separator color, but the only way I could find to do this was to add the method to one of the delegate callbacks, is there a better place I should put this?
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How to prevent SIGPIPEs (or handle them properly)
I have a small server program that accepts connections on a TCP or local UNIX socket, reads a simple command and, depending on the command, sends a reply. The problem is that the client may have no interest in the answer sometimes and exits early, so writing to that socket will cause a SIGPIPE and m...
How do I tokenize a string in C++?
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C++ standard library algorithms are pretty universally based around iterators rather than concrete containers. Unfortunately this makes it hard to provide a Java-like split function in the C++ standard library, even though nobody argues that this would be convenient. But wha...
Java Replacing multiple different substring in a string at once (or in the most efficient way)
...time up-front to compile, so it won't be efficient if your input is very small or your search pattern changes frequently).
Below is a full example, based on a list of tokens taken from a map. (Uses StringUtils from Apache Commons Lang).
Map<String,String> tokens = new HashMap<String,Strin...
Test if characters are in a string
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@Josh O'brien, that post compared finding (counting) all the matches in a single long string, try finding 1 match in a bunch of shorter strings: vec <- replicate(100000, paste( sample(letters, 10, replace=TRUE), collapse='') ).
– Greg Snow
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What does a double * (splat) operator do
... the double splat operator which is available since Ruby 2.0.
It captures all keyword arguments (which can also be a simple hash, which was the idiomatic way to emulate keyword arguments before they became part of the Ruby language)
def my_method(**options)
puts options.inspect
end
my_method(ke...
What is a segmentation fault?
...ng to a read-only portion of the memory, etc. Segmentation fault is essentially the same in most languages that let you mess with the memory management, there is no principial difference between segfaults in C and C++.
There are many ways to get a segfault, at least in the lower-level languages suc...
HttpServletRequest - how to obtain the referring URL?
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Actually it's:
request.getHeader("Referer"),
or even better, and to be 100% sure,
request.getHeader(HttpHeaders.REFERER),
where HttpHeaders is com.google.common.net.HttpHeaders
...