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Preliminary work supporting channels in databases
author Adam Chlipala <adamc@hcoop.net>
date Thu, 26 Mar 2009 16:22:34 -0400
parents 24fd1edfcaa3
children 1fb318c17546
rev   line source
adamc@421 1 con colMeta = fn t_formT :: (Type * Type) => {
adamc@421 2 Nam : string,
adamc@421 3 Show : t_formT.1 -> xbody,
adamc@421 4 Widget : nm :: Name -> xml form [] [nm = t_formT.2],
adamc@421 5 WidgetPopulated : nm :: Name -> t_formT.1 -> xml form [] [nm = t_formT.2],
adamc@421 6 Parse : t_formT.2 -> t_formT.1,
adamc@421 7 Inject : sql_injectable t_formT.1
adamc@421 8 }
adamc@622 9 con colsMeta = fn cols :: {(Type * Type)} => $(map colMeta cols)
adamc@421 10
adamc@421 11 fun default (t ::: Type) (sh : show t) (rd : read t) (inj : sql_injectable t)
adamc@421 12 name : colMeta (t, string) =
adamc@421 13 {Nam = name,
adamc@421 14 Show = txt,
adamc@421 15 Widget = fn nm :: Name => <xml><textbox{nm}/></xml>,
adamc@421 16 WidgetPopulated = fn (nm :: Name) n =>
adamc@421 17 <xml><textbox{nm} value={show n}/></xml>,
adamc@421 18 Parse = readError,
adamc@421 19 Inject = _}
adamc@421 20
adamc@421 21 val int = default
adamc@421 22 val float = default
adamc@421 23 val string = default
adamc@421 24
adamc@421 25 fun bool name = {Nam = name,
adamc@421 26 Show = txt,
adamc@421 27 Widget = fn nm :: Name => <xml><checkbox{nm}/></xml>,
adamc@421 28 WidgetPopulated = fn (nm :: Name) b =>
adamc@421 29 <xml><checkbox{nm} checked={b}/></xml>,
adamc@421 30 Parse = fn x => x,
adamc@421 31 Inject = _}
adamc@421 32
adamc@421 33 functor Make(M : sig
adamc@421 34 con cols :: {(Type * Type)}
adamc@421 35 constraint [Id] ~ cols
adamc@632 36 val fl : folder cols
adamc@632 37
adamc@637 38 val tab : sql_table ([Id = int] ++ map fst cols)
adamc@421 39
adamc@421 40 val title : string
adamc@421 41
adamc@421 42 val cols : colsMeta cols
adamc@421 43 end) = struct
adamc@421 44
adamc@421 45 open constraints M
adamc@421 46 val tab = M.tab
adamc@421 47
adamc@421 48 sequence seq
adamc@421 49
adamc@421 50 fun list () =
adamc@421 51 rows <- queryX (SELECT * FROM tab AS T)
adamc@637 52 (fn (fs : {T : $([Id = int] ++ map fst M.cols)}) => <xml>
adamc@421 53 <tr>
adamc@421 54 <td>{[fs.T.Id]}</td>
adamc@637 55 {foldRX2 [fst] [colMeta] [tr]
adamc@632 56 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
adamc@632 57 [[nm] ~ rest] v col => <xml>
adamc@632 58 <td>{col.Show v}</td>
adamc@632 59 </xml>)
adamc@632 60 [M.cols] M.fl (fs.T -- #Id) M.cols}
adamc@421 61 <td>
adamc@421 62 <a link={upd fs.T.Id}>[Update]</a>
adamc@421 63 <a link={confirm fs.T.Id}>[Delete]</a>
adamc@421 64 </td>
adamc@421 65 </tr>
adamc@421 66 </xml>);
adamc@421 67 return <xml>
adamc@421 68 <table border={1}>
adamc@421 69 <tr>
adamc@421 70 <th>ID</th>
adamc@632 71 {foldRX [colMeta] [tr]
adamc@421 72 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
adamc@421 73 [[nm] ~ rest] col => <xml>
adamc@421 74 <th>{cdata col.Nam}</th>
adamc@421 75 </xml>)
adamc@632 76 [M.cols] M.fl M.cols}
adamc@421 77 </tr>
adamc@421 78 {rows}
adamc@421 79 </table>
adamc@421 80
adamc@421 81 <br/><hr/><br/>
adamc@421 82
adamc@421 83 <form>
adamc@637 84 {foldR [colMeta] [fn cols :: {(Type * Type)} => xml form [] (map snd cols)]
adamc@632 85 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
adamc@637 86 [[nm] ~ rest] (col : colMeta t) (acc : xml form [] (map snd rest)) => <xml>
adamc@632 87 <li> {cdata col.Nam}: {col.Widget [nm]}</li>
adamc@632 88 {useMore acc}
adamc@632 89 </xml>)
adamc@421 90 <xml/>
adamc@632 91 [M.cols] M.fl M.cols}
adamc@421 92
adamc@421 93 <submit action={create}/>
adamc@421 94 </form>
adamc@421 95 </xml>
adamc@421 96
adamc@637 97 and create (inputs : $(map snd M.cols)) =
adamc@421 98 id <- nextval seq;
adamc@434 99 dml (insert tab
adamc@637 100 (foldR2 [snd] [colMeta]
adamc@632 101 [fn cols => $(map (fn t :: (Type * Type) =>
adamc@632 102 sql_exp [] [] [] t.1) cols)]
adamc@632 103 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
adamc@632 104 [[nm] ~ rest] =>
adamc@632 105 fn input col acc => acc ++ {nm = @sql_inject col.Inject (col.Parse input)})
adamc@632 106 {} [M.cols] M.fl inputs M.cols
adamc@471 107 ++ {Id = (SQL {[id]})}));
adamc@421 108 ls <- list ();
adamc@421 109 return <xml><body>
adamc@421 110 <p>Inserted with ID {[id]}.</p>
adamc@421 111
adamc@421 112 {ls}
adamc@421 113 </body></xml>
adamc@421 114
adamc@499 115 and upd (id : int) =
adamc@499 116 let
adamc@637 117 fun save (inputs : $(map snd M.cols)) =
adamc@637 118 dml (update [map fst M.cols] !
adamc@637 119 (foldR2 [snd] [colMeta]
adamc@632 120 [fn cols => $(map (fn t :: (Type * Type) =>
adamc@632 121 sql_exp [T = [Id = int]
adamc@637 122 ++ map fst M.cols]
adamc@632 123 [] [] t.1) cols)]
adamc@632 124 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
adamc@632 125 [[nm] ~ rest] =>
adamc@632 126 fn input col acc => acc ++ {nm =
adamc@632 127 @sql_inject col.Inject (col.Parse input)})
adamc@632 128 {} [M.cols] M.fl inputs M.cols)
adamc@499 129 tab (WHERE T.Id = {[id]}));
adamc@499 130 ls <- list ();
adamc@499 131 return <xml><body>
adamc@499 132 <p>Saved!</p>
adamc@421 133
adamc@499 134 {ls}
adamc@499 135 </body></xml>
adamc@499 136 in
adamc@637 137 fso <- oneOrNoRows (SELECT tab.{{map fst M.cols}} FROM tab WHERE tab.Id = {[id]});
adamc@637 138 case fso : (Basis.option {Tab : $(map fst M.cols)}) of
adamc@499 139 None => return <xml><body>Not found!</body></xml>
adamc@499 140 | Some fs => return <xml><body><form>
adamc@637 141 {foldR2 [fst] [colMeta] [fn cols :: {(Type * Type)} => xml form [] (map snd cols)]
adamc@632 142 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
adamc@632 143 [[nm] ~ rest] (v : t.1) (col : colMeta t)
adamc@637 144 (acc : xml form [] (map snd rest)) =>
adamc@632 145 <xml>
adamc@632 146 <li> {cdata col.Nam}: {col.WidgetPopulated [nm] v}</li>
adamc@632 147 {useMore acc}
adamc@632 148 </xml>)
adamc@632 149 <xml/>
adamc@632 150 [M.cols] M.fl fs.Tab M.cols}
adamc@421 151
adamc@499 152 <submit action={save}/>
adamc@499 153 </form></body></xml>
adamc@499 154 end
adamc@421 155
adamc@499 156 and confirm (id : int) =
adamc@499 157 let
adamc@499 158 fun delete () =
adamc@499 159 dml (DELETE FROM tab WHERE Id = {[id]});
adamc@499 160 ls <- list ();
adamc@499 161 return <xml><body>
adamc@499 162 <p>The deed is done.</p>
adamc@499 163
adamc@499 164 {ls}
adamc@499 165 </body></xml>
adamc@499 166 in
adamc@499 167 return <xml><body>
adamc@499 168 <p>Are you sure you want to delete ID #{[id]}?</p>
adamc@499 169
adamc@499 170 <p><a link={delete ()}>I was born sure!</a></p>
adamc@499 171 </body></xml>
adamc@499 172 end
adamc@421 173
adamc@421 174 and main () =
adamc@421 175 ls <- list ();
adamc@421 176 return <xml><head>
adamc@421 177 <title>{cdata M.title}</title>
adamc@421 178 </head><body>
adamc@421 179
adamc@421 180 <h1>{cdata M.title}</h1>
adamc@421 181
adamc@421 182 {ls}
adamc@421 183 </body></xml>
adamc@421 184
adamc@421 185 end