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"use strict"; | |
/** | |
* Hypertext Transfer Protocol (HTTP) response status codes. | |
* @see {@link https://en.wikipedia.org/wiki/List_of_HTTP_status_codes} | |
*/ | |
enum HttpStatusCode { | |
/** | |
* The server has received the request headers and the client should proceed to send the request body |
WebSockets is a modern HTML5 standard which makes communication between client and server a lot more simpler than ever. We are all familiar with the technology of sockets. Sockets have been fundamental to network communication for a long time but usually the communication over the browser has been restricted. The general restrictions
- The server used to have a permanent listener while the client (aka browser) was not designated any fixed listener for a more long term connection. Hence, every communication was restricted to the client demanding and the server responding.
- This meant that unless the client requested for a particular resource, the server was unable to push such a resource to the client.
- This was detrimental since the client is then forced to check with the server at regular intervals. This meant a lot of libraries focused on optimizing asynchronous calls and identifying the response of asynchronous calls. Notably t
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def get_count(q): | |
count_q = q.statement.with_only_columns([func.count()]).order_by(None) | |
count = q.session.execute(count_q).scalar() | |
return count | |
q = session.query(TestModel).filter(...).order_by(...) | |
# Slow: SELECT COUNT(*) FROM (SELECT ... FROM TestModel WHERE ...) ... | |
print q.count() |