Filter games version 3

sql/incoming-schema-changes.sql

@@ -1,3 +1,107 @@
 USE ifdb;
 
 -- use this script for pending changes to the production DB schema
+
+
+
+-- Add column for game search filter to the users table
+
+ALTER TABLE `users` ADD COLUMN `game_filter` VARCHAR(150) DEFAULT '';
+
+
+
+
+
+-- Add a view to track the news items for each game.
+-- "G" in the news table means the news is about a game.
+-- Do not include versions of news items that have been 
+-- superseded by later edits.
+
+CREATE VIEW `recentgamenews` AS 
+    SELECT 
+        newsid AS news_id,
+        sourceid AS game_id, 
+        created AS news_create_date
+    FROM news
+    WHERE source = "G"
+    AND newsid NOT IN (
+        SELECT supersedes
+        FROM news
+        WHERE supersedes IS NOT NULL
+    )
+    ORDER BY news_id DESC;
+
+
+
+-- Create a materialized view to store the data from the recentgamenews view
+
+CREATE TABLE recentgamenews_mv (
+  news_id BIGINT(20) unsigned NOT NULL,
+  game_id VARCHAR(32) NOT NULL,
+  news_create_date DATETIME NOT NULL,
+  PRIMARY KEY (news_id)
+);
+
+
+
+-- Populate the recentgamenews_mv materialized view from the recentgamenews view
+
+lock tables recentgamenews_mv write, recentgamenews read;
+truncate table recentgamenews_mv;
+insert into recentgamenews_mv select * from recentgamenews;
+unlock tables;
+
+
+
+-- Procedure to update one row of the recentgamenews_mv materialized view
+
+DROP PROCEDURE IF EXISTS refresh_recentgamenews_mv;
+DELIMITER $$
+
+CREATE PROCEDURE refresh_recentgamenews_mv (
+    IN new_newsid BIGINT(20)
+)
+BEGIN
+select *
+from recentgamenews
+where news_id = new_newsid
+into @news_id,
+     @game_id,
+     @news_create_date;
+if @news_id is null then
+    delete from recentgamenews_mv where news_id = new_news_id;
+else
+insert into recentgamenews_mv
+values (
+        @news_id,
+        @game_id,
+        @news_create_date
+    ) on duplicate key
+update news_id = @news_id,
+    game_id = @game_id,
+    news_create_date = @news_create_date;
+END IF;
+END;
+$$
+
+DELIMITER ;
+
+
+
+-- Create triggers so that when a news item for a game is added to the news table,
+-- the latest news date and the latest news id for that game will automatically
+-- be updated in the recentgamenews_mv materialized view. [Question: How do I limit this to just game news?]
+
+CREATE TRIGGER recentgamenews_insert
+AFTER INSERT ON news FOR EACH ROW
+call refresh_recentgamenews_mv(NEW.newsid);
+
+
+CREATE TRIGGER recentgamenews_update
+AFTER UPDATE ON news FOR EACH ROW
+call refresh_gametimes_mv(NEW.newsid);
+
+
+CREATE TRIGGER recentgamenews_delete
+AFTER DELETE ON news FOR EACH ROW
+call refresh_recentgamenews_mv(OLD.newsid);