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How to create a MySQL hierarchical recursive query
...nitialisation
where find_in_set(parent_id, @pv)
and length(@pv := concat(@pv, ',', id))
Here is a fiddle.
Here, the value specified in @pv := '19' should be set to the id of the parent you want to select all the descendants of.
This will work also if a parent has multiple children. However...
Java Replacing multiple different substring in a string at once (or in the most efficient way)
...String,String> tokens = new HashMap<String,String>();
tokens.put("cat", "Garfield");
tokens.put("beverage", "coffee");
String template = "%cat% really needs some %beverage%.";
// Create pattern of the format "%(cat|beverage)%"
String patternString = "%(" + StringUtils.join(tokens.keySet()...
How to use R's ellipsis feature when writing your own function?
...parameter in advance, however, as it adds some ambiguity and further complication to the argument string (and makes the function signature unclear to any other user). The argument list is an important piece of documentation for function users.
Otherwise, it is also useful for cases when you want t...
How to find out which processes are using swap space in Linux?
...kB\tpid";
echo "========================================";
cat ${TMP}/${SCRIPT_NAME}.name|sort -r;
;;
kb )
echo -e "kB\tpid\tname";
echo "========================================";
cat ${TMP}/${SCRIPT_NAME}.kb|sort -rh;
;;
pid | * )
...
Why is (object)0 == (object)0 different from ((object)0).Equals((object)0)?
...
The C# Language Specification, paragraph 7.10.6, says: The predefined reference type equality operators are: bool operator ==(object x, object y); bool operator !=(object x, object y); The operators return the result of comparing the two references...
通过 ulimit 改善系统性能 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...序都不会受其影响：
Shell 进程 1
ulimit – s 100
cat testFile > newFile
File size limit exceeded
Shell 进程 2
cat testFile > newFile
ls – s newFile
323669 newFile
那么，是否有针对某个具体用户的资源加以限制的方法呢？答...
Convert String to Uri
...o its standards. For example, try to parse: http://www.google.com/search?q=cat|dog. An exception will be thrown for the vertical bar.
urllib makes it easy to convert a string to a java.net.URI. It will pre-process and escape the URL.
assertEquals("http://www.google.com/search?q=cat%7Cdog",
Ur...
Tool for adding license headers to source files? [closed]
...c # or whatever other pattern...
do
if ! grep -q Copyright $i
then
cat copyright.txt $i >$i.new && mv $i.new $i
fi
done
share
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Creating a singleton in Python
...hing that works in both Python2 and 3 requires using a slightly more complicated scheme. Since metaclasses are usually subclasses of type type, it's possible to use one to dynamically create an intermediary base class at run time with it as its metaclass and then use that as the baseclass of the pub...
How to send file contents as body entity using cURL
...
If you want to be real fancy you can do: cat file.txt | curl --data "@-" `(< url.txt )` @- tells curl to read from stdin. You could also just use the redirect (< x.txt ) to put in whatever you want. If you're using bash.
– Breedly
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