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view demo/crud.ur @ 1006:5a0f6ec208ce
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author | Adam Chlipala <adamc@hcoop.net> |
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date | Thu, 22 Oct 2009 11:15:37 -0400 |
parents | bb3fc575cfe7 |
children | 8d3aa6c7cee0 |
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con colMeta = fn (db :: Type, widget :: Type) => {Nam : string, Show : db -> xbody, Widget : nm :: Name -> xml form [] [nm = widget], WidgetPopulated : nm :: Name -> db -> xml form [] [nm = widget], Parse : widget -> db, Inject : sql_injectable db} con colsMeta = fn cols :: {(Type * Type)} => $(map colMeta cols) fun default [t] (sh : show t) (rd : read t) (inj : sql_injectable t) name : colMeta (t, string) = {Nam = name, Show = txt, Widget = fn [nm :: Name] => <xml><textbox{nm}/></xml>, WidgetPopulated = fn [nm :: Name] n => <xml><textbox{nm} value={show n}/></xml>, Parse = readError, Inject = _} val int = default val float = default val string = default fun bool name = {Nam = name, Show = txt, Widget = fn [nm :: Name] => <xml><checkbox{nm}/></xml>, WidgetPopulated = fn [nm :: Name] b => <xml><checkbox{nm} checked={b}/></xml>, Parse = fn x => x, Inject = _} functor Make(M : sig con cols :: {(Type * Type)} constraint [Id] ~ cols val fl : folder cols table tab : ([Id = int] ++ map fst cols) val title : string val cols : colsMeta cols end) = struct val tab = M.tab sequence seq fun list () = rows <- queryX (SELECT * FROM tab AS T) (fn (fs : {T : $([Id = int] ++ map fst M.cols)}) => <xml> <tr> <td>{[fs.T.Id]}</td> {foldRX2 [fst] [colMeta] [tr] (fn [nm :: Name] [t :: (Type * Type)] [rest :: {(Type * Type)}] [[nm] ~ rest] v col => <xml> <td>{col.Show v}</td> </xml>) [M.cols] M.fl (fs.T -- #Id) M.cols} <td> <a link={upd fs.T.Id}>[Update]</a> <a link={confirm fs.T.Id}>[Delete]</a> </td> </tr> </xml>); return <xml> <table border={1}> <tr> <th>ID</th> {foldRX [colMeta] [tr] (fn [nm :: Name] [t :: (Type * Type)] [rest :: {(Type * Type)}] [[nm] ~ rest] col => <xml> <th>{cdata col.Nam}</th> </xml>) [M.cols] M.fl M.cols} </tr> {rows} </table> <br/><hr/><br/> <form> {foldR [colMeta] [fn cols :: {(Type * Type)} => xml form [] (map snd cols)] (fn [nm :: Name] [t :: (Type * Type)] [rest :: {(Type * Type)}] [[nm] ~ rest] (col : colMeta t) (acc : xml form [] (map snd rest)) => <xml> <li> {cdata col.Nam}: {col.Widget [nm]}</li> {useMore acc} </xml>) <xml/> [M.cols] M.fl M.cols} <submit action={create}/> </form> </xml> and create (inputs : $(map snd M.cols)) = id <- nextval seq; dml (insert tab (foldR2 [snd] [colMeta] [fn cols => $(map (fn t :: (Type * Type) => sql_exp [] [] [] t.1) cols)] (fn [nm :: Name] [t :: (Type * Type)] [rest :: {(Type * Type)}] [[nm] ~ rest] => fn input col acc => acc ++ {nm = @sql_inject col.Inject (col.Parse input)}) {} [M.cols] M.fl inputs M.cols ++ {Id = (SQL {[id]})})); ls <- list (); return <xml><body> <p>Inserted with ID {[id]}.</p> {ls} </body></xml> and upd (id : int) = let fun save (inputs : $(map snd M.cols)) = dml (update [map fst M.cols] ! (foldR2 [snd] [colMeta] [fn cols => $(map (fn t :: (Type * Type) => sql_exp [T = [Id = int] ++ map fst M.cols] [] [] t.1) cols)] (fn [nm :: Name] [t :: (Type * Type)] [rest :: {(Type * Type)}] [[nm] ~ rest] => fn input col acc => acc ++ {nm = @sql_inject col.Inject (col.Parse input)}) {} [M.cols] M.fl inputs M.cols) tab (WHERE T.Id = {[id]})); ls <- list (); return <xml><body> <p>Saved!</p> {ls} </body></xml> in fso <- oneOrNoRows (SELECT tab.{{map fst M.cols}} FROM tab WHERE tab.Id = {[id]}); case fso : (Basis.option {Tab : $(map fst M.cols)}) of None => return <xml><body>Not found!</body></xml> | Some fs => return <xml><body><form> {foldR2 [fst] [colMeta] [fn cols :: {(Type * Type)} => xml form [] (map snd cols)] (fn [nm :: Name] [t :: (Type * Type)] [rest :: {(Type * Type)}] [[nm] ~ rest] (v : t.1) (col : colMeta t) (acc : xml form [] (map snd rest)) => <xml> <li> {cdata col.Nam}: {col.WidgetPopulated [nm] v}</li> {useMore acc} </xml>) <xml/> [M.cols] M.fl fs.Tab M.cols} <submit action={save}/> </form></body></xml> end and confirm (id : int) = let fun delete () = dml (DELETE FROM tab WHERE Id = {[id]}); ls <- list (); return <xml><body> <p>The deed is done.</p> {ls} </body></xml> in return <xml><body> <p>Are you sure you want to delete ID #{[id]}?</p> <form><submit action={delete} value="I was born sure!"/></form> </body></xml> end and main () = ls <- list (); return <xml><head> <title>{cdata M.title}</title> </head><body> <h1>{cdata M.title}</h1> {ls} </body></xml> end