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IPN vs PDT in Paypal
...und to be very clear and helpful - and it's still valid in 2018.
https://www.codexworld.com/paypal-standard-payment-gateway-integration-php/
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case-insensitive list sorting, without lowercasing the result?
... a Unicode string to a string in Python (containing extra symbols)
https://www.programiz.com/python-programming/list-comprehension
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follow
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SVN checkout ignore folder
...folder for exclusion then delete the unwanted folder.
svn checkout http://www.example.com/project
cd project
svn update --set-depth=exclude docs
rm -fr docs
From now on any updates to the working copy won't repopulate the docs folder.
See http://blogs.collab.net/subversion/2009/03/sparse-directo...
Why unsigned integer is not available in PostgreSQL?
...d types. However I would suggest to use domains for unsigned types.
http://www.postgresql.org/docs/9.4/static/sql-createdomain.html
CREATE DOMAIN name [ AS ] data_type
[ COLLATE collation ]
[ DEFAULT expression ]
[ constraint [ ... ] ]
where constraint is:
[ CONSTRAINT constraint_name...
How does lock work exactly?
...n the way you lock. You can find a good list of optimizations here: http://www.thinkingparallel.com/2007/07/31/10-ways-to-reduce-lock-contention-in-threaded-programs/
Basically you should try to lock as little as possible, since it puts your waiting code to sleep. If you have some heavy calculation...
What is a dependency property?
...
The only explanation I found helpful and well written is this one: http://www.wpftutorial.net/dependencyproperties.html
Basically, DependencyProperties differ from regular properties in that they're not just setters / getters for fields in the class, but they retrieve their actual values dynamical...
What is the recommended approach towards multi-tenant databases in MongoDB?
...ere are no performance tradeoffs
using lots of collections. See
http://www.mongodb.org/display/DOCS/Using+a+Large+Number+of+Collections
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HTML5 Email Validation
...
The input type=email page of the www.w3.org site notes that an email address is any string which matches the following regular expression:
/^[a-zA-Z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$/
Use the required attribute and a patter...
The character encoding of the HTML document was not declared
...file:
<!DOCTYPE html PUBLIC"-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>insert page</title>...
Make WPF window draggable, no matter what element is clicked
... CodeProject demonstrates one possible solution to implement this:
http://www.codeproject.com/KB/cs/DraggableForm.aspx
Basically a descendant of the Form type is created in which the mouse down, up and move events are handled.
Mouse down: remember position
Mouse move: store new location
Mous...