大约有 44,000 项符合查询结果（耗时：0.0213秒） [XML]
How to parse XML to R data frame
...
Data in XML format are rarely organized in a way that would allow the xmlToDataFrame function to work. You're better off extracting everything in lists and then binding the lists together in a data frame:
require(XML)
data <- xmlPars...
MySQL Workbench Dark Theme
...so let me answer that. MySQL Workbench's themes are a collection of colors for certain main parts of the application. It is planned to allow customizing them in a later version. In order to get a dark theme as one of the templates please file a feature request at http://bugs.mysql.com. But keep in m...
How to increase the gap between text and underlining in CSS
...eclaration, i.e. border-bottom-width: 1px and border-bottom-style: solid.
For multiline, you can wrap you multiline texts in a span inside the element. E.g. <a href="#"><span>insert multiline texts here</span></a> then just add border-bottom and padding on the <span> -...
Select SQL Server database size
...AL(8,2))
FROM sys.master_files WITH(NOWAIT)
WHERE database_id = DB_ID() -- for current db
GROUP BY database_id
Output:
-- my query
name log_size_mb row_size_mb total_size_mb
-------------- ------------ ------------- -------------
xxxxxxxxxxx 512.00 302.81 814.81
-- ...
Test if remote TCP port is open from a shell script
I'm looking for a quick and simple method for properly testing if a given TCP port is open on a remote server, from inside a Shell script.
...
JSON to pandas DataFrame
...tionnary :
data = json.loads(elevations)
Then modify data on the fly :
for result in data['results']:
result[u'lat']=result[u'location'][u'lat']
result[u'lng']=result[u'location'][u'lng']
del result[u'location']
Rebuild json string :
elevations = json.dumps(data)
Finally :
pd.r...
How to kill/stop a long SQL query immediately?
...ws. I tried to cancel it via the red cancel button, but it has not stopped for the past 10 minutes. It usually stops within 3 minutes.
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Is 'switch' faster than 'if'?
...gh, as it only works when the input can be bounded some way.
C Pseudocode for a "jump table" would be something like this -- note that the compiler in practice would need to insert some form of if test around the table to ensure that the input was valid in the table. Note also that it only works in...
What is the difference between the kernel space and the user space?
...el space, and normal programs run in user space. User space is basically a form of sand-boxing -- it restricts user programs so they can't mess with memory (and other resources) owned by other programs or by the OS kernel. This limits (but usually doesn't entirely eliminate) their ability to do bad ...
Artificially create a connection timeout error
... a port that is blocked by the firewall that simply drops TCP SYN packets. For example, www.google.com:81.
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