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Concurrent HashSet in .NET Framework?
...people got it wrong). In order to be "Concurrent" operations like GetOrAdd etc should be implemented (like the dictionary) or else concurrency cannot be ensured without additional locking. But if you need additional locking outside the class then why don't you use a simple HashSet right from the sta...
Where does Oracle SQL Developer store connections?
...nect to the database fine using Oracle SQL Developer, create tables, views etc. However, I'm having a hard time getting connected via my application. Where is the connection information? In what file? I wanted to compare my connection info with what is set up in the SQL Explorer's file. I found all ...
How can I remove all my changes in my SVN working directory?
...
Remove any other change and supports removing files/folders with spaces, etc.
svn status --no-ignore | grep -E '(^\?)|(^\I)' | sed -e 's/^. *//' | sed -e 's/\(.*\)/"\1"/' | xargs rm -rf
Don't forget to get the latest files from SVN
svn update --force
...
How to convert SQL Query result to PANDAS Data Structure?
... will do the job:
from pandas import DataFrame
df = DataFrame(resoverall.fetchall())
df.columns = resoverall.keys()
You can go fancier and parse the types as in Paul's answer.
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Center HTML Input Text Field Placeholder
...But you can always change other things, like color, font-size, font-family etc. I suggest you rethinking your design whether possible to remove this center behavior.
EDIT
If you really want this text centered, you can always use some jQuery code or plugin to simulate the placeholder behavior. Here...
When are you supposed to use escape instead of encodeURI / encodeURIComponent?
...erally, they should not be used unless interacting with an app/web service/etc designed for them.
– Anthony DiSanti
Jul 12 '11 at 19:03
3
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How to take screenshot of a div with JavaScript?
...his:
var c = document.getElementById('the_canvas_element_id');
var t = c.getContext('2d');
/* then use the canvas 2D drawing functions to add text, etc. for the result */
When the user clicks "Capture", do this:
window.open('', document.getElementById('the_canvas_element_id').toDataURL());
Thi...
Handling an empty UITableView. Print a friendly message
...andatory, it's also possible to just show the empty state without a button etc.
For Swift 4
// MARK: - Deal with the empty data set
// Add title for empty dataset
func title(forEmptyDataSet _: UIScrollView!) -> NSAttributedString! {
let str = "Welcome"
let attrs = [NSAttributedStringKey...
g++ undefined reference to typeinfo
...access can happen when you create an object of the class, use dynamic_cast etc.
[source]
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How to change the docker image installation directory?
...ou would set the value of the data-root parameter to your custom path, in /etc/docker/daemon.json
(according to https://docs.docker.com/engine/reference/commandline/dockerd/#daemon-configuration-file).
With older versions, you can change Docker's storage base directory (where container and images g...