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Postgres and Indexes on Foreign Keys and Primary Keys
...PostgreSQL automatically creates indexes on primary keys and unique constraints, but not on the referencing side of foreign key relationships.
When Pg creates an implicit index it will emit a NOTICE-level message that you can see in psql and/or the system logs, so you can see when it happens. Auto...
How to get a specific output iterating a hash in Ruby?
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Calling sort on a hash converts it into nested arrays and then sorts them by key, so all you need is this:
puts h.sort.map {|k,v| ["#{k}----"] + v}
And if you don't actually need the "----" part, it can be just:
puts h.sort
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Reading 64bit Registry from a 32bit application
...of using "Wow6432Node", which emulates a node by mapping one registry tree into another making it appear there virtually, you can do the follwing:
Decide, whether you need to access the 64 bit or the 32 bit registry, and use it as described below. You may also use the code I mentioned later (Additio...
log4j vs logback [closed]
...er direction, log4j configuration, i.e. log4j.properties, would need to be converted to its logback equivalent. There is an on-line tool for that. The amount of work involved in migrating configuration files is much less than the work required to migrate logger calls disseminated throughout all your...
Calendar.getInstance(TimeZone.getTimeZone(“UTC”)) is not returning UTC time
... invocation returns a Date from getTime(). It is the Date which is getting converted to a string for println, and that conversion will use the default IST timezone in your case.
You'll need to explicitly use DateFormat.setTimeZone() to print the Date in the desired timezone.
EDIT: Courtesy of @Lau...
How to find/identify large commits in git history?
... tail -1). Newlines get in the way for anything bigger. You can use sed to convert the newlines so grep will play nice: git rev-list --objects --all | grep -E `git verify-pack -v .git/objects/pack/*.idx | sort -k 3 -n | tail -10 | awk '{print$1}' | sed ':a;N;$!ba;s/\n/|/g'`
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Open files in 'rt' and 'wt' modes
...no difference between text mode and binary mode,
however, in windows, they converts \n to \r\n when text mode.
http://www.cygwin.com/cygwin-ug-net/using-textbinary.html
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Java String split removed empty values
...String[] split = data.split("\\|", -1);
Little more details:
split(regex) internally returns result of split(regex, 0) and in documentation of this method you can find (emphasis mine)
The limit parameter controls the number of times the pattern is applied and therefore affects the length of the re...
AJAX Mailchimp signup form integration
...rated form.
You don't need any further intervention now as mailchimp will convert the form to an ajax submitted one when javascript is enabled.
All you need to do now is just paste the generated form from the embed menu into your html page and NOT modify or add any other code.
This simply works. ...
What's the best way to send a signal to all members of a process group?
... any command, if you want a normal argument that starts with a - to not be interpreted as a switch, precede it with --: kill -- -GPID
– ysth
Dec 24 '08 at 21:47
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