module Wiki (
- WB
+ Backend
,PGB
) where
import Dbconnect
import Data.Char
-class WB a where
+class Backend a where
--Keyword -> (Full text,date)
- getCurrent :: a -> String -> IO (String,String)
+ getCurrent :: a -> String -> IO (Maybe (String,String))
--Keyword -> [(id,date)]
getList :: a -> String -> IO [(String, String, String, String)]
get :: a -> String -> String -> IO String
--Keyword -> id -> ()
- setCurrent :: a -> String -> String -> IO Int
+ setCurrent :: a -> String -> String -> IO Bool
--Keyword -> Full text -> id
- addNew :: a -> String -> String -> IO String
+ update :: a -> String -> String -> String -> String -> IO String
-data PGB = PGB DBService
+newtype PGB = PGB DBService
createPGB :: String -> String -> String -> String -> IO PGB
createPGB host database user password = let db = createDBService host database "" user password Nothing in return (PGB db)
testDB = createPGB "wave" "wiki" "wiki" "12wiki34db"
-instance WB PGB where
+instance Backend PGB where
getCurrent (PGB db) key = do
- [[text,date]] <- selectReturnTuples db $ "SELECT fulltext,timestamp FROM curtexts where keyword='"++(escapeQuery key)++"'"
- return (text,date)
+ result <- selectReturnTuples db $ "SELECT fulltext,timestamp FROM curtexts WHERE keyword="++tov key
+ case result of
+ [text,date]:_ -> return (Just (text,date))
+ _ -> return Nothing
getList (PGB db) key = do
- list <- selectReturnTuples db $ "SELECT id, timestamp, author, comment from fulltexts where keyword = '"++(escapeQuery key)++"'"
+ list <- selectReturnTuples db $ "SELECT id, timestamp, author, comment from fulltexts WHERE keyword = "++tov key
return $ map (\[id,date,author,comment] -> (id,date,author,comment)) list
get (PGB db) key id = return ""
- setCurrent (PGB db) key id =
- execute db $ "UPDATE current SET id = '"++(escapeQuery id)++"' where keyword = '"++(escapeQuery key)++"'"
-
- addNew (PGB db) key text = return ""
+ setCurrent (PGB db) key id = do
+ full <- selectReturnTuples db $ "SELECT keyword FROM fulltexts WHERE keyword="++tov key++" AND id='"++id++"'"
+ cur <- selectReturnTuples db $ "SELECT keyword FROM curtexts WHERE keyword='"++tov key++"'"
+ case full of
+ [[]] -> do
+ print "No text found with this id and key"
+ return False
+ _ -> do
+ rows <- case cur of
+ [] -> do
+ print "No link found in current, inserting"
+ execute db $ "INSERT INTO current (keyword, id) VALUES ("++tov id++","++tov key++")"
+ _ -> do
+ print "Link found in current, updating"
+ execute db $ "UPDATE current SET id = "++tov id++" WHERE keyword = "++tov key
+ print rows
+ if rows == 1 then return True
+ else return False
+
+ update (PGB db) key text author comment = do
+ rows <- execute db $ "INSERT INTO fulltexts (keyword,fulltext, author, comment) VALUES ("++tov key++","++tov text++","++tov author++","++tov comment++")"
+ if rows == 0 then return ""
+ else do
+ [[id]] <- selectReturnTuples db $ "SELECT currval('fulltexts_id_seq')"
+ setCurrent (PGB db) key id
+ return id
+
+
+tov :: String -> String
+tov s = '\'':escapeQuery s++"'"
+