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How do you create a random string that's suitable for a session ID in PostgreSQL?
I'd like to make a random string for use in session verification using PostgreSQL. I know I can get a random number with SELECT random() , so I tried SELECT md5(random()) , but that doesn't work. How can I do this?
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How do you add CSS with Javascript?
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...on all but (naturally) IE8 and prior, which uses its own marginally-different wording:
sheet.addRule('strong', 'color: red;', -1);
There is a theoretical advantage in this compared to the createElement-set-innerHTML method, in that you don't have to worry about putting special HTML characte...
Convert command line arguments into an array in Bash
...id, you can convert it into an actual array like this:
myArray=( "$@" )
If you just want to type some arguments and feed them into the $@ value, use set:
$ set -- apple banana "kiwi fruit"
$ echo "$#"
3
$ echo "$@"
apple banana kiwi fruit
Understanding how to use the argument structure is part...
How do I pass a command line argument while starting up GDB in Linux? [duplicate]
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Once gdb starts, you can run the program using "r args".
So if you are running your code by:
$ executablefile arg1 arg2 arg3
Debug it on gdb by:
$ gdb executablefile
(gdb) r arg1 arg2 arg3
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Best way to convert an ArrayList to a string
...kes as second argument Iterable<? extends CharSequence>. So it works if you have a List<String> that you want to display, but if you have List<MyObject> it will not call toString() in it as wanted by the OP
– Hilikus
Aug 22 '14 at 22:30
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定时任务使用指导 · App Inventor 2 中文网
...点、每周几的几点、每隔几分钟。
设置了通知标题（NotificationTitle）或通知文字（NotificationText）时，App 不在前台也会到点弹一条通知。
积木只能在 App 运行时执行，所以到点时分两种情况：
到点时 App 的状态
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Make footer stick to bottom of page correctly [duplicate]
...oter (just a div with a line of text in it) be at the bottom of the screen if the content doesn't go all the way to the bottom, or be at the bottom of the content if the content requires scroll bars. If the content doesn't require scroll bars, it works perfectly, but when the content is too long, t...
How to find out which package version is loaded in R?
... LC_TELEPHONE=C LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] graphics grDevices utils datasets stats grid methods base
other attached packages:
[1] ggplot2_0.9.0 reshape2_1.2.1 plyr_1.7.1
loaded via a namespac...
Why should I use core.autocrlf=true in Git?
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The only specific reasons to set autocrlf to true are:
avoid git status showing all your files as modified because of the automatic EOL conversion done when cloning a Unix-based EOL Git repo to a Windows one (see issue 83 for instance)
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How do I turn on SQL debug logging for ActiveRecord in RSpec tests?
...ould try setting the ActiveRecord logger to stdout in your test somewhere. If you're using rspec, maybe in the spec helper?
ActiveRecord::Base.logger = Logger.new(STDOUT)
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