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MongoDB/NoSQL: Keeping Document Change History
...equirement in database applications is to track changes to one or more specific entities in a database. I've heard this called row versioning, a log table or a history table (I'm sure there are other names for it). There are a number of ways to approach it in an RDBMS--you can write all changes fr...
PHP script to loop through all of the files in a directory?
...ike to be able to sort the files by name, type or by date created/added/modified. (Think fancy directory "index".) I'd also like to be able to add exclusions to the list of files, such as the script itself or other "system" files. (Like the . and .. "directories".)
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How can I create an error 404 in PHP?
... to /word_here to /page.php?name=word_here . The PHP script then checks if the requested page is in its array of pages.
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How to avoid 'cannot read property of undefined' errors?
...
Update:
If you use JavaScript according to ECMAScript 2020 or later, see optional chaining.
TypeScript has added support for optional chaining in version 3.7.
// use it like this
obj?.a?.lot?.of?.properties
Solution for JavaScr...
Biggest GWT Pitfalls? [closed]
...in control of who you hire, then you can always choose people that either know GWT or want to learn it.
Problem: GWT is a sledgehammer compared to something like jquery or just plain javascript. It takes a lot more setup to get it happening than just including a JS file.
Solution: Use libraries ...
Multiple Updates in MySQL
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If there is no duplicates then i dont want that row to be inserted. what should id do? because i am fetching information from another site which maintains tables with id's. I am inserting values with respect to that id. if th...
Why does an image captured using camera intent gets rotated on some devices on Android?
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Most phone cameras are landscape, meaning if you take the photo in portrait, the resulting photos will be rotated 90 degrees. In this case, the camera software should populate the Exif data with the orientation that the photo should be viewed in.
Note that the below...
How to convert array values to lowercase in PHP?
...ap('nestedLowercase', $yourArray);
function nestedLowercase($value) {
if (is_array($value)) {
return array_map('nestedLowercase', $value);
}
return strtolower($value);
}
share
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How do you check in python whether a string contains only numbers?
...s, negatives numbers, etc.. All the examples before will be wrong.
Until now I got something like this, but I think it could be a lot better:
'95.95'.replace('.','',1).isdigit()
will return true only if there is one or no '.' in the string of digits.
'9.5.9.5'.replace('.','',1).isdigit()
wil...
Sorting an array of objects in Ruby by object attribute?
...me + @first_name <=> other.last_name + other.first_name
end
end
Now an array of Person objects will be sortable on last_name.
ar = [Person.new("Eric", "Cunningham"), Person.new("Homer", "Allen")]
puts ar # => [ "Eric Cunningham", "Homer Allen"] (Person objects!)
ar.sort!
puts ar ...