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How to change the CHARACTER SET (and COLLATION) throughout a database?
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371
change database collation:
ALTER DATABASE <database_name> CHARACTER SET utf8 COLLATE utf...
How to synchronize a static variable among threads running different instances of a class in Java?
...nchronized (countLock) {
count++;
}
}
}
Method 3 is the best in many cases because the lock object is not exposed outside of your class.
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Find column whose name contains a specific string
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239
Just iterate over DataFrame.columns, now this is an example in which you will end up with a lis...
What does “mro()” do?
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answered Jan 6 '10 at 3:17
Alex MartelliAlex Martelli
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Lua简明教程 - 脚本技术 - 清泛IT论坛，有思想、有深度
...。chenhao-air:lua chenhao$ lua
Lua 5.2.2 Copyright (C) 1994-2013 Lua.org, PUC-Rio
> print("Hello, World")
Hello, World
>复制代码
也可以把脚本存成一个文件，用如下命令行来运行。>lua file.lua复制代码
或是像shell一样运行：c...
ggplot2 legend to bottom and horizontal
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Shreyas KarnikShreyas Karnik
3,32333 gold badges2323 silver badges2626 bronze badges
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How to compile without warnings being treated as errors?
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83
Sure, find where -Werror is set and remove that flag. Then warnings will be only warnings.
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How to move certain commits to be based on another branch in git?
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380
This is a classic case of rebase --onto:
# let's go to current master (X, where quickfix2 sh...
File content into unix variable with newlines
...:
pax> function count {
...> echo $#
...> }
pax> count 1 2 3
3
pax> count a b c d
4
pax> count $x
4
pax> count "$x"
1
Here, the count function simply prints out the number of arguments given. The 1 2 3 and a b c d variants show it in action.
Then we try it with the two va...
Turning live() into on() in jQuery
...hods:
$(selector).live(events, data, handler); // jQuery 1.3+
$(document).delegate(selector, events, data, handler); // jQuery 1.4.3+
$(document).on(events, selector, data, handler); // jQuery 1.7+
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