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Improve detection of XML in urweb-mode; small tutorial improvement
author Adam Chlipala <adam@chlipala.net>
date Tue, 02 Aug 2011 17:28:37 -0400
parents 18d18a70821e
children 9253765d7724
rev   line source
adamc@623 1 (** Row folding *)
adamc@623 2
adamc@623 3 con folder = K ==> fn r :: {K} =>
adamc@623 4 tf :: ({K} -> Type)
adamc@653 5 -> (nm :: Name -> v :: K -> r :: {K} -> [[nm] ~ r] =>
adamc@653 6 tf r -> tf ([nm = v] ++ r))
adamc@623 7 -> tf [] -> tf r
adamc@623 8
adamc@822 9 fun fold [K] [tf :: {K} -> Type]
adamc@653 10 (f : (nm :: Name -> v :: K -> r :: {K} -> [[nm] ~ r] =>
adamc@653 11 tf r -> tf ([nm = v] ++ r)))
adamc@1093 12 (i : tf []) [r ::: {K}] (fl : folder r) = fl [tf] f i
adamc@653 13
adamc@627 14 structure Folder = struct
adamc@822 15 fun nil [K] [tf :: {K} -> Type]
adamc@653 16 (f : nm :: Name -> v :: K -> r :: {K} -> [[nm] ~ r] =>
adamc@653 17 tf r -> tf ([nm = v] ++ r))
adamc@627 18 (i : tf []) = i
adamc@627 19
adamc@822 20 fun cons [K] [r ::: {K}] [nm :: Name] [v :: K] [[nm] ~ r] (fold : folder r)
adamc@822 21 [tf :: {K} -> Type]
adamc@653 22 (f : nm :: Name -> v :: K -> r :: {K} -> [[nm] ~ r] =>
adamc@653 23 tf r -> tf ([nm = v] ++ r))
adam@1472 24 (i : tf []) = f [nm] [v] [r] (fold [tf] f i)
adamc@628 25
adamc@822 26 fun concat [K] [r1 ::: {K}] [r2 ::: {K}] [r1 ~ r2]
adamc@628 27 (f1 : folder r1) (f2 : folder r2)
adamc@822 28 [tf :: {K} -> Type]
adamc@653 29 (f : nm :: Name -> v :: K -> r :: {K} -> [[nm] ~ r] =>
adamc@653 30 tf r -> tf ([nm = v] ++ r))
adamc@628 31 (i : tf []) =
adamc@629 32 f1 [fn r1' => [r1' ~ r2] => tf (r1' ++ r2)]
adamc@822 33 (fn [nm :: Name] [v :: K] [r1' :: {K}] [[nm] ~ r1']
adamc@653 34 (acc : [r1' ~ r2] => tf (r1' ++ r2))
adamc@653 35 [[nm = v] ++ r1' ~ r2] =>
adam@1472 36 f [nm] [v] [r1' ++ r2] acc)
adam@1472 37 (fn [[] ~ r2] => f2 [tf] f i)
adamc@630 38
adamc@822 39 fun mp [K1] [K2] [f ::: K1 -> K2] [r ::: {K1}]
adamc@630 40 (fold : folder r)
adamc@822 41 [tf :: {K2} -> Type]
adamc@653 42 (f : nm :: Name -> v :: K2 -> r :: {K2} -> [[nm] ~ r] =>
adamc@653 43 tf r -> tf ([nm = v] ++ r))
adamc@630 44 (i : tf []) =
adamc@630 45 fold [fn r => tf (map f r)]
adamc@822 46 (fn [nm :: Name] [v :: K1] [rest :: {K1}] [[nm] ~ rest] (acc : tf (map f rest)) =>
adam@1472 47 f [nm] [f v] [map f rest] acc)
adamc@630 48 i
adamc@627 49 end
adamc@627 50
adamc@623 51
adamc@422 52 fun not b = if b then False else True
adamc@422 53
adamc@898 54 con id = K ==> fn t :: K => t
adamc@356 55 con record (t :: {Type}) = $t
adamc@637 56 con fst = K1 ==> K2 ==> fn t :: (K1 * K2) => t.1
adamc@637 57 con snd = K1 ==> K2 ==> fn t :: (K1 * K2) => t.2
adamc@637 58 con fst3 = K1 ==> K2 ==> K3 ==> fn t :: (K1 * K2 * K3) => t.1
adamc@637 59 con snd3 = K1 ==> K2 ==> K3 ==> fn t :: (K1 * K2 * K3) => t.2
adamc@637 60 con thd3 = K1 ==> K2 ==> K3 ==> fn t :: (K1 * K2 * K3) => t.3
adamc@329 61
adamc@643 62 con mapU = K ==> fn f :: K => map (fn _ :: Unit => f)
adamc@445 63
adam@1434 64 con ex = K ==> fn tf :: (K -> Type) =>
adam@1434 65 res ::: Type -> (choice :: K -> tf choice -> res) -> res
adamc@339 66
adam@1434 67 fun ex_intro [K] [tf :: K -> Type] [choice :: K] (body : tf choice) : ex tf =
adam@1434 68 fn [res] (f : choice :: K -> tf choice -> res) =>
adamc@356 69 f [choice] body
adamc@339 70
adam@1434 71 fun ex_elim [K] [tf ::: K -> Type] (v : ex tf) [res ::: Type] = @@v [res]
adam@1434 72
adamc@822 73 fun compose [t1 ::: Type] [t2 ::: Type] [t3 ::: Type]
adamc@356 74 (f1 : t2 -> t3) (f2 : t1 -> t2) (x : t1) = f1 (f2 x)
adamc@325 75
adamc@822 76 fun show_option [t ::: Type] (_ : show t) =
adamc@777 77 mkShow (fn opt : option t =>
adamc@777 78 case opt of
adamc@777 79 None => ""
adamc@777 80 | Some x => show x)
adamc@777 81
adamc@822 82 fun read_option [t ::: Type] (_ : read t) =
adamc@777 83 mkRead (fn s =>
adamc@777 84 case s of
adamc@777 85 "" => None
adamc@777 86 | _ => Some (readError s : t))
adamc@777 87 (fn s =>
adamc@777 88 case s of
adamc@777 89 "" => Some None
adamc@777 90 | _ => case read s of
adamc@777 91 None => None
adamc@777 92 | v => Some v)
adamc@777 93
adam@1360 94 fun txt [t] [ctx ::: {Unit}] [use ::: {Type}] (_ : show t) (v : t) : xml ctx use [] =
adamc@564 95 cdata (show v)
adamc@328 96
adamc@1093 97 fun map0 [K] [tf :: K -> Type] (f : t :: K -> tf t) [r ::: {K}] (fl : folder r) =
adamc@993 98 fl [fn r :: {K} => $(map tf r)]
adamc@993 99 (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest] acc =>
adamc@993 100 acc ++ {nm = f [t]})
adamc@993 101 {}
adamc@993 102
adamc@1093 103 fun mp [K] [tf1 :: K -> Type] [tf2 :: K -> Type] (f : t ::: K -> tf1 t -> tf2 t) [r ::: {K}] (fl : folder r) =
adamc@898 104 fl [fn r :: {K} => $(map tf1 r) -> $(map tf2 r)]
adamc@898 105 (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest] acc r =>
adamc@898 106 acc (r -- nm) ++ {nm = f r.nm})
adamc@898 107 (fn _ => {})
adamc@898 108
adamc@905 109 fun map2 [K] [tf1 :: K -> Type] [tf2 :: K -> Type] [tf3 :: K -> Type]
adamc@1093 110 (f : t ::: K -> tf1 t -> tf2 t -> tf3 t) [r ::: {K}] (fl : folder r) =
adamc@905 111 fl [fn r :: {K} => $(map tf1 r) -> $(map tf2 r) -> $(map tf3 r)]
adamc@905 112 (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest] acc r1 r2 =>
adamc@905 113 acc (r1 -- nm) (r2 -- nm) ++ {nm = f r1.nm r2.nm})
adamc@905 114 (fn _ _ => {})
adamc@898 115
adamc@937 116 fun map3 [K] [tf1 :: K -> Type] [tf2 :: K -> Type] [tf3 :: K -> Type] [tf :: K -> Type]
adamc@1093 117 (f : t ::: K -> tf1 t -> tf2 t -> tf3 t -> tf t) [r ::: {K}] (fl : folder r) =
adamc@937 118 fl [fn r :: {K} => $(map tf1 r) -> $(map tf2 r) -> $(map tf3 r) -> $(map tf r)]
adamc@937 119 (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest] acc r1 r2 r3 =>
adamc@937 120 acc (r1 -- nm) (r2 -- nm) (r3 -- nm) ++ {nm = f r1.nm r2.nm r3.nm})
adamc@937 121 (fn _ _ _ => {})
adamc@937 122
adamc@822 123 fun foldUR [tf :: Type] [tr :: {Unit} -> Type]
adamc@411 124 (f : nm :: Name -> rest :: {Unit}
adamc@629 125 -> [[nm] ~ rest] =>
adamc@411 126 tf -> tr rest -> tr ([nm] ++ rest))
adamc@1093 127 (i : tr []) [r ::: {Unit}] (fl : folder r) =
adamc@653 128 fl [fn r :: {Unit} => $(mapU tf r) -> tr r]
adamc@822 129 (fn [nm :: Name] [t :: Unit] [rest :: {Unit}] [[nm] ~ rest] acc r =>
adam@1472 130 f [nm] [rest] r.nm (acc (r -- nm)))
adamc@653 131 (fn _ => i)
adamc@411 132
adamc@822 133 fun foldUR2 [tf1 :: Type] [tf2 :: Type] [tr :: {Unit} -> Type]
adamc@418 134 (f : nm :: Name -> rest :: {Unit}
adamc@629 135 -> [[nm] ~ rest] =>
adamc@418 136 tf1 -> tf2 -> tr rest -> tr ([nm] ++ rest))
adamc@1093 137 (i : tr []) [r ::: {Unit}] (fl : folder r) =
adamc@653 138 fl [fn r :: {Unit} => $(mapU tf1 r) -> $(mapU tf2 r) -> tr r]
adamc@822 139 (fn [nm :: Name] [t :: Unit] [rest :: {Unit}] [[nm] ~ rest] acc r1 r2 =>
adam@1472 140 f [nm] [rest] r1.nm r2.nm (acc (r1 -- nm) (r2 -- nm)))
adamc@653 141 (fn _ _ => i)
adamc@418 142
adamc@822 143 fun foldR [K] [tf :: K -> Type] [tr :: {K} -> Type]
adamc@623 144 (f : nm :: Name -> t :: K -> rest :: {K}
adamc@629 145 -> [[nm] ~ rest] =>
adamc@356 146 tf t -> tr rest -> tr ([nm = t] ++ rest))
adamc@1093 147 (i : tr []) [r ::: {K}] (fl : folder r) =
adamc@653 148 fl [fn r :: {K} => $(map tf r) -> tr r]
adamc@822 149 (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest] (acc : _ -> tr rest) r =>
adam@1472 150 f [nm] [t] [rest] r.nm (acc (r -- nm)))
adamc@653 151 (fn _ => i)
adamc@336 152
adamc@822 153 fun foldR2 [K] [tf1 :: K -> Type] [tf2 :: K -> Type] [tr :: {K} -> Type]
adamc@623 154 (f : nm :: Name -> t :: K -> rest :: {K}
adamc@629 155 -> [[nm] ~ rest] =>
adamc@367 156 tf1 t -> tf2 t -> tr rest -> tr ([nm = t] ++ rest))
adamc@1093 157 (i : tr []) [r ::: {K}] (fl : folder r) =
adamc@653 158 fl [fn r :: {K} => $(map tf1 r) -> $(map tf2 r) -> tr r]
adamc@822 159 (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest]
adamc@653 160 (acc : _ -> _ -> tr rest) r1 r2 =>
adam@1472 161 f [nm] [t] [rest] r1.nm r2.nm (acc (r1 -- nm) (r2 -- nm)))
adamc@653 162 (fn _ _ => i)
adamc@332 163
adamc@910 164 fun foldR3 [K] [tf1 :: K -> Type] [tf2 :: K -> Type] [tf3 :: K -> Type] [tr :: {K} -> Type]
adamc@910 165 (f : nm :: Name -> t :: K -> rest :: {K}
adamc@910 166 -> [[nm] ~ rest] =>
adamc@910 167 tf1 t -> tf2 t -> tf3 t -> tr rest -> tr ([nm = t] ++ rest))
adamc@1093 168 (i : tr []) [r ::: {K}] (fl : folder r) =
adamc@910 169 fl [fn r :: {K} => $(map tf1 r) -> $(map tf2 r) -> $(map tf3 r) -> tr r]
adamc@910 170 (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest]
adamc@910 171 (acc : _ -> _ -> _ -> tr rest) r1 r2 r3 =>
adam@1472 172 f [nm] [t] [rest] r1.nm r2.nm r3.nm (acc (r1 -- nm) (r2 -- nm) (r3 -- nm)))
adamc@910 173 (fn _ _ _ => i)
adamc@910 174
adamc@1172 175 fun mapUX [tf :: Type] [ctx :: {Unit}]
adamc@1172 176 (f : nm :: Name -> rest :: {Unit} -> [[nm] ~ rest] => tf -> xml ctx [] []) =
adamc@1172 177 @@foldR [fn _ => tf] [fn _ => xml ctx [] []]
adamc@1172 178 (fn [nm :: Name] [u :: Unit] [rest :: {Unit}] [[nm] ~ rest] r acc =>
adam@1472 179 <xml>{f [nm] [rest] r}{acc}</xml>)
adamc@1172 180 <xml/>
adamc@1172 181
adamc@1172 182 fun mapX [K] [tf :: K -> Type] [ctx :: {Unit}]
adamc@623 183 (f : nm :: Name -> t :: K -> rest :: {K}
adamc@629 184 -> [[nm] ~ rest] =>
adamc@720 185 tf t -> xml ctx [] []) =
adamc@1093 186 @@foldR [tf] [fn _ => xml ctx [] []]
adamc@1093 187 (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest] r acc =>
adam@1472 188 <xml>{f [nm] [t] [rest] r}{acc}</xml>)
adamc@1093 189 <xml/>
adamc@336 190
adamc@1173 191 fun mapUX2 [tf1 :: Type] [tf2 :: Type] [ctx :: {Unit}]
adamc@1173 192 (f : nm :: Name -> rest :: {Unit}
adamc@1173 193 -> [[nm] ~ rest] =>
adamc@1173 194 tf1 -> tf2 -> xml ctx [] []) =
adamc@1173 195 @@foldUR2 [tf1] [tf2] [fn _ => xml ctx [] []]
adamc@1173 196 (fn [nm :: Name] [rest :: {Unit}] [[nm] ~ rest] v1 v2 acc =>
adam@1472 197 <xml>{f [nm] [rest] v1 v2}{acc}</xml>)
adamc@1173 198 <xml/>
adamc@1173 199
adamc@1172 200 fun mapX2 [K] [tf1 :: K -> Type] [tf2 :: K -> Type] [ctx :: {Unit}]
adamc@623 201 (f : nm :: Name -> t :: K -> rest :: {K}
adamc@629 202 -> [[nm] ~ rest] =>
adamc@720 203 tf1 t -> tf2 t -> xml ctx [] []) =
adamc@1093 204 @@foldR2 [tf1] [tf2] [fn _ => xml ctx [] []]
adamc@1093 205 (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest]
adamc@1093 206 r1 r2 acc =>
adam@1472 207 <xml>{f [nm] [t] [rest] r1 r2}{acc}</xml>)
adamc@1093 208 <xml/>
adamc@445 209
adamc@1172 210 fun mapX3 [K] [tf1 :: K -> Type] [tf2 :: K -> Type] [tf3 :: K -> Type] [ctx :: {Unit}]
adamc@910 211 (f : nm :: Name -> t :: K -> rest :: {K}
adamc@910 212 -> [[nm] ~ rest] =>
adamc@910 213 tf1 t -> tf2 t -> tf3 t -> xml ctx [] []) =
adamc@1093 214 @@foldR3 [tf1] [tf2] [tf3] [fn _ => xml ctx [] []]
adamc@1093 215 (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest]
adamc@1093 216 r1 r2 r3 acc =>
adam@1472 217 <xml>{f [nm] [t] [rest] r1 r2 r3}{acc}</xml>)
adamc@1093 218 <xml/>
adamc@910 219
adam@1394 220 fun query1 [t ::: Name] [fs ::: {Type}] [state ::: Type] (q : sql_query [] [] [t = fs] [])
adamc@1177 221 (f : $fs -> state -> transaction state) (i : state) =
adamc@1177 222 query q (fn r => f r.t) i
adamc@1177 223
adam@1394 224 fun query1' [t ::: Name] [fs ::: {Type}] [state ::: Type] (q : sql_query [] [] [t = fs] [])
adamc@1177 225 (f : $fs -> state -> state) (i : state) =
adamc@1177 226 query q (fn r s => return (f r.t s)) i
adamc@1177 227
adam@1394 228 fun queryL [tables] [exps] [tables ~ exps] (q : sql_query [] [] tables exps) =
adamc@1081 229 query q
adamc@1081 230 (fn r ls => return (r :: ls))
adamc@1081 231 []
adamc@1081 232
adam@1394 233 fun queryL1 [t ::: Name] [fs ::: {Type}] (q : sql_query [] [] [t = fs] []) =
adam@1321 234 query q
adam@1321 235 (fn r ls => return (r.t :: ls))
adam@1321 236 []
adam@1321 237
adamc@822 238 fun queryI [tables ::: {{Type}}] [exps ::: {Type}]
adam@1394 239 [tables ~ exps] (q : sql_query [] [] tables exps)
adamc@682 240 (f : $(exps ++ map (fn fields :: {Type} => $fields) tables)
adamc@682 241 -> transaction unit) =
adamc@682 242 query q
adamc@682 243 (fn fs _ => f fs)
adamc@682 244 ()
adamc@682 245
adam@1394 246 fun queryI1 [nm ::: Name] [fs ::: {Type}] (q : sql_query [] [] [nm = fs] [])
adam@1363 247 (f : $fs -> transaction unit) =
adam@1363 248 query q
adam@1363 249 (fn fs _ => f fs.nm)
adam@1363 250 ()
adam@1363 251
adamc@1004 252 fun queryX [tables ::: {{Type}}] [exps ::: {Type}] [ctx ::: {Unit}] [inp ::: {Type}]
adam@1394 253 [tables ~ exps] (q : sql_query [] [] tables exps)
adamc@621 254 (f : $(exps ++ map (fn fields :: {Type} => $fields) tables)
adamc@1004 255 -> xml ctx inp []) =
adamc@356 256 query q
adamc@356 257 (fn fs acc => return <xml>{acc}{f fs}</xml>)
adamc@360 258 <xml/>
adamc@341 259
adam@1405 260 fun rev [a] (ls : list a) : list a =
adam@1405 261 let
adam@1405 262 fun rev' ls acc =
adam@1405 263 case ls of
adam@1405 264 [] => acc
adam@1405 265 | x :: ls => rev' ls (x :: acc)
adam@1405 266 in
adam@1405 267 rev' ls []
adam@1405 268 end
adam@1405 269
adam@1405 270 fun queryXI [tables ::: {{Type}}] [exps ::: {Type}] [ctx ::: {Unit}] [inp ::: {Type}]
adam@1405 271 [tables ~ exps] (q : sql_query [] [] tables exps)
adam@1405 272 (f : int -> $(exps ++ map (fn fields :: {Type} => $fields) tables)
adam@1405 273 -> xml ctx inp []) =
adam@1405 274 let
adam@1405 275 fun qxi ls i =
adam@1405 276 case ls of
adam@1405 277 [] => <xml/>
adam@1405 278 | x :: ls => <xml>{f i x}{qxi ls (i+1)}</xml>
adam@1405 279 in
adam@1405 280 ls <- queryL q;
adam@1406 281 return (qxi (rev ls) 0)
adam@1405 282 end
adam@1405 283
adamc@1076 284 fun queryX1 [nm ::: Name] [fs ::: {Type}] [ctx ::: {Unit}] [inp ::: {Type}]
adam@1394 285 (q : sql_query [] [] [nm = fs] [])
adamc@1076 286 (f : $fs -> xml ctx inp []) =
adamc@1076 287 query q
adamc@1076 288 (fn fs acc => return <xml>{acc}{f fs.nm}</xml>)
adamc@1076 289 <xml/>
adamc@1076 290
adam@1405 291 fun queryX1I [nm ::: Name] [fs ::: {Type}] [ctx ::: {Unit}] [inp ::: {Type}]
adam@1405 292 (q : sql_query [] [] [nm = fs] [])
adam@1405 293 (f : int -> $fs -> xml ctx inp []) =
adam@1405 294 let
adam@1405 295 fun qx1i ls i =
adam@1405 296 case ls of
adam@1405 297 [] => <xml/>
adam@1405 298 | x :: ls => <xml>{f i x.nm}{qx1i ls (i+1)}</xml>
adam@1405 299 in
adam@1405 300 ls <- queryL q;
adam@1406 301 return (qx1i (rev ls) 0)
adam@1405 302 end
adam@1405 303
adamc@1032 304 fun queryX' [tables ::: {{Type}}] [exps ::: {Type}] [ctx ::: {Unit}] [inp ::: {Type}]
adam@1394 305 [tables ~ exps] (q : sql_query [] [] tables exps)
adamc@621 306 (f : $(exps ++ map (fn fields :: {Type} => $fields) tables)
adamc@1032 307 -> transaction (xml ctx inp [])) =
adamc@469 308 query q
adamc@469 309 (fn fs acc =>
adamc@469 310 r <- f fs;
adamc@469 311 return <xml>{acc}{r}</xml>)
adamc@469 312 <xml/>
adamc@469 313
adamc@1110 314 fun queryX1' [nm ::: Name] [fs ::: {Type}] [ctx ::: {Unit}] [inp ::: {Type}]
adam@1394 315 (q : sql_query [] [] [nm = fs] [])
adamc@1110 316 (f : $fs -> transaction (xml ctx inp [])) =
adamc@1110 317 query q
adamc@1110 318 (fn fs acc =>
adamc@1110 319 r <- f fs.nm;
adamc@1110 320 return <xml>{acc}{r}</xml>)
adamc@1110 321 <xml/>
adamc@1110 322
adamc@1110 323 fun queryXE' [exps ::: {Type}] [ctx ::: {Unit}] [inp ::: {Type}]
adam@1394 324 (q : sql_query [] [] [] exps)
adamc@1110 325 (f : $exps -> transaction (xml ctx inp [])) =
adamc@1110 326 query q
adamc@1110 327 (fn fs acc =>
adamc@1110 328 r <- f fs;
adamc@1110 329 return <xml>{acc}{r}</xml>)
adamc@1110 330 <xml/>
adamc@1110 331
adamc@1072 332 fun hasRows [tables ::: {{Type}}] [exps ::: {Type}]
adamc@1072 333 [tables ~ exps]
adam@1394 334 (q : sql_query [] [] tables exps) =
adamc@1072 335 query q
adamc@1072 336 (fn _ _ => return True)
adamc@1072 337 False
adamc@1072 338
adamc@822 339 fun oneOrNoRows [tables ::: {{Type}}] [exps ::: {Type}]
adamc@629 340 [tables ~ exps]
adam@1394 341 (q : sql_query [] [] tables exps) =
adamc@356 342 query q
adamc@356 343 (fn fs _ => return (Some fs))
adamc@356 344 None
adamc@440 345
adam@1394 346 fun oneOrNoRows1 [nm ::: Name] [fs ::: {Type}] (q : sql_query [] [] [nm = fs] []) =
adamc@1003 347 query q
adamc@1003 348 (fn fs _ => return (Some fs.nm))
adamc@1003 349 None
adamc@1003 350
adam@1394 351 fun oneOrNoRowsE1 [tabs ::: {Unit}] [nm ::: Name] [t ::: Type] [tabs ~ [nm]] (q : sql_query [] [] (mapU [] tabs) [nm = t]) =
adamc@1006 352 query q
adamc@1006 353 (fn fs _ => return (Some fs.nm))
adamc@1006 354 None
adamc@1006 355
adamc@822 356 fun oneRow [tables ::: {{Type}}] [exps ::: {Type}]
adam@1394 357 [tables ~ exps] (q : sql_query [] [] tables exps) =
adamc@440 358 o <- oneOrNoRows q;
adamc@440 359 return (case o of
adamc@440 360 None => error <xml>Query returned no rows</xml>
adamc@440 361 | Some r => r)
adamc@440 362
adam@1394 363 fun oneRow1 [nm ::: Name] [fs ::: {Type}] (q : sql_query [] [] [nm = fs] []) =
adamc@1076 364 o <- oneOrNoRows q;
adamc@1076 365 return (case o of
adamc@1076 366 None => error <xml>Query returned no rows</xml>
adamc@1076 367 | Some r => r.nm)
adamc@1076 368
adam@1394 369 fun oneRowE1 [tabs ::: {Unit}] [nm ::: Name] [t ::: Type] [tabs ~ [nm]] (q : sql_query [] [] (mapU [] tabs) [nm = t]) =
adamc@1003 370 o <- oneOrNoRows q;
adamc@1003 371 return (case o of
adamc@1003 372 None => error <xml>Query returned no rows</xml>
adamc@1003 373 | Some r => r.nm)
adamc@1003 374
adamc@1074 375 fun nonempty [fs] [us] (t : sql_table fs us) =
adamc@1074 376 oneRowE1 (SELECT COUNT( * ) > 0 AS B FROM t)
adamc@1074 377
adamc@822 378 fun eqNullable [tables ::: {{Type}}] [agg ::: {{Type}}] [exps ::: {Type}]
adamc@822 379 [t ::: Type] (_ : sql_injectable (option t))
adamc@470 380 (e1 : sql_exp tables agg exps (option t))
adamc@470 381 (e2 : sql_exp tables agg exps (option t)) =
adamc@471 382 (SQL ({e1} IS NULL AND {e2} IS NULL) OR {e1} = {e2})
adamc@470 383
adamc@822 384 fun eqNullable' [tables ::: {{Type}}] [agg ::: {{Type}}] [exps ::: {Type}]
adamc@822 385 [t ::: Type] (_ : sql_injectable (option t))
adamc@470 386 (e1 : sql_exp tables agg exps (option t))
adamc@470 387 (e2 : option t) =
adamc@470 388 case e2 of
adamc@471 389 None => (SQL {e1} IS NULL)
adamc@564 390 | Some _ => sql_binary sql_eq e1 (sql_inject e2)
adam@1360 391
adam@1360 392 fun mkRead' [t ::: Type] (f : string -> option t) (name : string) : read t =
adam@1360 393 mkRead (fn s => case f s of
adam@1360 394 None => error <xml>Invalid {txt name}: {txt s}</xml>
adam@1360 395 | Some v => v) f