learn-request-queue/db/90-views.sql

CREATE OR REPLACE FUNCTION get_requests()
	RETURNS TABLE (
		url varchar,
		requester varchar,
		imageUrl varchar,
		state varchar,
		score int,
		reqTimestamp timestamptz
	)
	LANGUAGE SQL
	AS $$
		SELECT url,displayName AS requester,imageUrl,state,score,reqTimestamp FROM requests
			JOIN scores USING (url)
			JOIN users ON requests.requester = users.userid
			WHERE state IN (SELECT state FROM states WHERE active)
			ORDER BY score DESC, reqTimestamp ASC;
	$$;

CREATE OR REPLACE FUNCTION get_requests_all()
	RETURNS TABLE (
		url varchar,
		requester varchar,
		imageUrl varchar,
		state varchar,
		score int,
		reqTimestamp timestamptz
	)
	LANGUAGE SQL
	AS $$
		SELECT url,displayName AS requester,imageUrl,state,score,reqTimestamp FROM requests
			JOIN scores USING (url)
			JOIN users ON requests.requester = users.userid
			ORDER BY score DESC, reqTimestamp ASC;
	$$;

CREATE OR REPLACE FUNCTION get_requests_voted(votinguserid int)
	RETURNS TABLE (
		url varchar,
		requester varchar,
		imageUrl varchar,
		state varchar,
		score int,
		reqTimestamp timestamptz,
		voted bool
	)
	LANGUAGE SQL
	AS $$
		SELECT url,displayName AS requester,imageUrl,state,score,reqTimestamp,
				(CASE WHEN votes.userid IS NULL THEN FALSE ELSE TRUE END) AS voted
			FROM requests
			JOIN scores USING (url)
			JOIN users ON requests.requester = users.userid
			LEFT JOIN votes ON (requests.url = votes.requesturl AND votes.userid = votinguserid)
			WHERE state IN (SELECT state FROM states WHERE active)
			ORDER BY score DESC, reqTimestamp ASC;
	$$;

CREATE OR REPLACE FUNCTION get_requests_all_voted(votinguserid int)
	RETURNS TABLE (
		url varchar,
		requester varchar,
		imageUrl varchar,
		state varchar,
		score int,
		reqTimestamp timestamptz,
		voted bool
	)
	LANGUAGE SQL
	AS $$
		SELECT url,displayName AS requester,imageUrl,state,score,reqTimestamp,
				(CASE WHEN votes.userid IS NULL THEN FALSE ELSE TRUE END) AS voted
			FROM requests
			JOIN scores USING (url)
			JOIN users ON requests.requester = users.userid
			LEFT JOIN votes ON (requests.url = votes.requesturl AND votes.userid = votinguserid)
			ORDER BY score DESC, reqTimestamp ASC;
	$$;

/*
Views to determine the score added by votes from different classes of users.
In order for songs with no votes to show up in this view (and thus have their
scores properly calculated), the query must be JOINed to requests, the URL must
be selected as requests.url rather than votes.requesturl (which is null in the
case of no votes), and users.is{follower,subscriber} must be COALESCEd to FALSE
as in the case of no votes, user.* will be NULL.
 */

CREATE OR REPLACE VIEW vote_score_normal_vw AS
	SELECT requests.url,COUNT(votes.requesturl),(COUNT(votes.requesturl) * (SELECT normaluservotepoints FROM config)) AS votescore FROM requests
		LEFT JOIN votes ON votes.requesturl = requests.url
		LEFT JOIN users on votes.userid = users.userid
		WHERE COALESCE(users.isfollower,FALSE) = FALSE AND COALESCE(users.issubscriber,FALSE) = FALSE
		GROUP BY requests.url;

CREATE OR REPLACE VIEW vote_score_follower_vw AS
	SELECT requests.url,COUNT(votes.requesturl),(COUNT(votes.requesturl) * (SELECT followervotepoints FROM config)) AS votescore FROM requests
		LEFT JOIN votes ON votes.requesturl = requests.url
		LEFT JOIN users on votes.userid = users.userid
		WHERE COALESCE(users.isfollower,FALSE) = TRUE AND COALESCE(users.issubscriber,FALSE) = FALSE
		GROUP BY requests.url;

CREATE OR REPLACE VIEW vote_score_subscriber_vw AS
	SELECT requests.url,COUNT(votes.requesturl),(COUNT(votes.requesturl) * (SELECT subscribervotepoints FROM config)) AS votescore FROM requests
		LEFT JOIN votes ON votes.requesturl = requests.url
		LEFT JOIN users on votes.userid = users.userid
		WHERE COALESCE(users.issubscriber,FALSE) = TRUE
		GROUP BY requests.url;

CREATE OR REPLACE VIEW vote_score_all_vw AS
	SELECT url,SUM(count) AS count, SUM(votescore) AS votescore FROM
		(SELECT * FROM vote_score_normal_vw
			UNION ALL SELECT * FROM vote_score_follower_vw
			UNION ALL SELECT * FROM vote_score_subscriber_vw
		) AS union_vote_score
		GROUP BY url;

CREATE OR REPLACE VIEW streamer_user_vw AS
	SELECT users.userid as userid, users.displayname as displayname, users.imageurl as imageurl FROM streamer
		LEFT JOIN users
			ON streamer.userid = users.userid;