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What generates the “text file busy” message in Unix?
...eck what other processes are using it. You can use kill command to kill it if needed.
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How to add 'ON DELETE CASCADE' in ALTER TABLE statement
...d try your above command, put add constraint instead of modify constraint.
Now this is the command:
ALTER TABLE child_table_name
ADD CONSTRAINT fk_name
FOREIGN KEY (child_column_name)
REFERENCES parent_table_name(parent_column_name)
ON DELETE CASCADE;
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Suppress/ print without b' prefix for bytes in Python 3
...
If the bytes use an appropriate character encoding already; you could print them directly:
sys.stdout.buffer.write(data)
or
nwritten = os.write(sys.stdout.fileno(), data) # NOTE: it may write less than len(data) bytes
...
How do I view events fired on an element in Chrome DevTools?
...ect wanted element) then go to Console tab and write:
monitorEvents($0)
Now when you move mouse over this element, focus or click it, the name of the fired event will be displayed with its data.
To stop getting this data just write this to console:
unmonitorEvents($0)
$0 is just the last DOM ...
Max parallel http connections in a browser?
...
As of version 50+ Chrome now supports a maximum of 17 Max Connections, bringing it on a par with Firefox and Safari.
– Zhaph - Ben Duguid
Mar 13 '17 at 17:15
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Javascript: Round up to the next multiple of 5
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I arrived here while searching for something similar.
If my number is —0, —1, —2 it should floor to —0, and if it's —3, —4, —5 it should ceil to —5.
I came up with this solution:
function round(x) { return x%5<3 ? (x%5===0 ? x : Math.floor(x/5)*5) : Math.cei...
Selenium wait until document is ready
...it.SECONDS);
The above code will wait up to 10 seconds for page loading. If the page loading exceeds the time it will throw the TimeoutException. You catch the exception and do your needs. I am not sure whether it quits the page loading after the exception thrown. i didn't try this code yet. Want...
Loading local JSON file
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In a more modern way, you can now use the Fetch API:
fetch("test.json")
.then(response => response.json())
.then(json => console.log(json));
All modern browsers support Fetch API. (Internet Explorer doesn't, but Edge does!)
source:
Using F...
How to convert JSON to CSV format and store in a variable
... cases separately. If no replacer is used null will be outputted as null - now the examples should handle both null, undefined and numbers correctly.
– Christian Landgren
Oct 20 '16 at 7:15
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Deleting rows with MySQL LEFT JOIN
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You simply need to specify on which tables to apply the DELETE.
Delete only the deadline rows:
DELETE `deadline` FROM `deadline` LEFT JOIN `job` ....
Delete the deadline and job rows:
DELETE `deadline`, `job` FROM `deadline` LEFT JOIN `job` ....