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Pushing policies through
author Adam Chlipala <adamc@hcoop.net>
date Sun, 04 Apr 2010 12:29:34 -0400
parents aff5e661b5f8
children ae3036773768
rev   line source
adamc@56 1 type int
adamc@56 2 type float
adamc@56 3 type string
adamc@821 4 type char
adamc@436 5 type time
adamc@737 6 type blob
adamc@91 7
adamc@119 8 type unit = {}
adamc@119 9
adamc@186 10 datatype bool = False | True
adamc@186 11
adamc@288 12 datatype option t = None | Some of t
adamc@284 13
adamc@757 14 datatype list t = Nil | Cons of t * list t
adamc@757 15
adamc@91 16
adamc@256 17 (** Basic type classes *)
adamc@256 18
adamc@256 19 class eq
adamc@256 20 val eq : t ::: Type -> eq t -> t -> t -> bool
adamc@257 21 val ne : t ::: Type -> eq t -> t -> t -> bool
adamc@256 22 val eq_int : eq int
adamc@394 23 val eq_float : eq float
adamc@256 24 val eq_string : eq string
adamc@821 25 val eq_char : eq char
adamc@256 26 val eq_bool : eq bool
adamc@437 27 val eq_time : eq time
adamc@422 28 val mkEq : t ::: Type -> (t -> t -> bool) -> eq t
adamc@256 29
adamc@389 30 class num
adamc@417 31 val zero : t ::: Type -> num t -> t
adamc@389 32 val neg : t ::: Type -> num t -> t -> t
adamc@389 33 val plus : t ::: Type -> num t -> t -> t -> t
adamc@389 34 val minus : t ::: Type -> num t -> t -> t -> t
adamc@389 35 val times : t ::: Type -> num t -> t -> t -> t
adamc@775 36 val divide : t ::: Type -> num t -> t -> t -> t
adamc@389 37 val mod : t ::: Type -> num t -> t -> t -> t
adamc@389 38 val num_int : num int
adamc@390 39 val num_float : num float
adamc@389 40
adamc@391 41 class ord
adamc@391 42 val lt : t ::: Type -> ord t -> t -> t -> bool
adamc@391 43 val le : t ::: Type -> ord t -> t -> t -> bool
adamc@391 44 val gt : t ::: Type -> ord t -> t -> t -> bool
adamc@391 45 val ge : t ::: Type -> ord t -> t -> t -> bool
adamc@391 46 val ord_int : ord int
adamc@394 47 val ord_float : ord float
adamc@394 48 val ord_string : ord string
adamc@821 49 val ord_char : ord char
adamc@394 50 val ord_bool : ord bool
adamc@437 51 val ord_time : ord time
adamc@961 52 val mkOrd : t ::: Type -> {Lt : t -> t -> bool, Le : t -> t -> bool} -> ord t
adamc@391 53
adamc@256 54
adamc@1061 55 (** Character operations *)
adamc@1061 56
adamc@1061 57 val isalnum : char -> bool
adamc@1061 58 val isalpha : char -> bool
adamc@1061 59 val isblank : char -> bool
adamc@1061 60 val iscntrl : char -> bool
adamc@1061 61 val isdigit : char -> bool
adamc@1061 62 val isgraph : char -> bool
adamc@1061 63 val islower : char -> bool
adamc@1061 64 val isprint : char -> bool
adamc@1061 65 val ispunct : char -> bool
adamc@1061 66 val isspace : char -> bool
adamc@1061 67 val isupper : char -> bool
adamc@1061 68 val isxdigit : char -> bool
adamc@1061 69 val tolower : char -> char
adamc@1061 70 val toupper : char -> char
adamc@1128 71 val ord : char -> int
adamc@1128 72 val chr : int -> char
adamc@1061 73
adamc@283 74 (** String operations *)
adamc@283 75
adamc@828 76 val strlen : string -> int
adamc@283 77 val strcat : string -> string -> string
adamc@821 78 val strsub : string -> int -> char
adamc@821 79 val strsuffix : string -> int -> string
adamc@829 80 val strchr : string -> char -> option string
adamc@829 81 val strindex : string -> char -> option int
adamc@831 82 val strcspn : string -> string -> option int
adamc@829 83 val substring : string -> int -> int -> string
adamc@1023 84 val str1 : char -> string
adamc@283 85
adamc@286 86 class show
adamc@286 87 val show : t ::: Type -> show t -> t -> string
adamc@286 88 val show_int : show int
adamc@286 89 val show_float : show float
adamc@286 90 val show_string : show string
adamc@821 91 val show_char : show char
adamc@286 92 val show_bool : show bool
adamc@436 93 val show_time : show time
adamc@452 94 val mkShow : t ::: Type -> (t -> string) -> show t
adamc@286 95
adamc@290 96 class read
adamc@290 97 val read : t ::: Type -> read t -> string -> option t
adamc@292 98 val readError : t ::: Type -> read t -> string -> t
adamc@292 99 (* [readError] calls [error] if the input is malformed. *)
adamc@290 100 val read_int : read int
adamc@290 101 val read_float : read float
adamc@290 102 val read_string : read string
adamc@821 103 val read_char : read char
adamc@290 104 val read_bool : read bool
adamc@436 105 val read_time : read time
adamc@777 106 val mkRead : t ::: Type -> (string -> t) -> (string -> option t) -> read t
adamc@288 107
adamc@283 108
adamc@564 109 (** * Monads *)
adamc@564 110
adamc@711 111 class monad :: (Type -> Type) -> Type
adamc@564 112 val return : m ::: (Type -> Type) -> t ::: Type
adamc@564 113 -> monad m
adamc@564 114 -> t -> m t
adamc@564 115 val bind : m ::: (Type -> Type) -> t1 ::: Type -> t2 ::: Type
adamc@564 116 -> monad m
adamc@564 117 -> m t1 -> (t1 -> m t2)
adamc@564 118 -> m t2
adamc@564 119
adamc@456 120 con transaction :: Type -> Type
adamc@564 121 val transaction_monad : monad transaction
adamc@456 122
adamc@565 123 con source :: Type -> Type
adamc@565 124 val source : t ::: Type -> t -> transaction (source t)
adamc@575 125 val set : t ::: Type -> source t -> t -> transaction unit
adamc@601 126 val get : t ::: Type -> source t -> transaction t
adamc@565 127
adamc@565 128 con signal :: Type -> Type
adamc@565 129 val signal_monad : monad signal
adamc@565 130 val signal : t ::: Type -> source t -> signal t
adamc@841 131 val current : t ::: Type -> signal t -> transaction t
adamc@456 132
adamc@456 133
adamc@1006 134 (** * Time *)
adamc@1006 135
adamc@1006 136 val now : transaction time
adamc@1050 137 val minTime : time
adamc@1138 138 val minusSeconds : time -> int -> time
adamc@1006 139
adamc@1006 140
adamc@456 141 (** HTTP operations *)
adamc@456 142
adamc@459 143 con http_cookie :: Type -> Type
adamc@459 144 val getCookie : t ::: Type -> http_cookie t -> transaction (option t)
adamc@1050 145 val setCookie : t ::: Type -> http_cookie t -> {Value : t,
adamc@1050 146 Expires : option time,
adamc@1050 147 Secure : bool} -> transaction unit
adamc@1050 148 val clearCookie : t ::: Type -> http_cookie t -> transaction unit
adamc@459 149
adamc@456 150
adamc@566 151 (** JavaScript-y gadgets *)
adamc@566 152
adamc@566 153 val alert : string -> transaction unit
adamc@694 154 val spawn : transaction unit -> transaction unit
adamc@695 155 val sleep : int -> transaction unit
adamc@566 156
adamc@908 157 val rpc : t ::: Type -> transaction t -> transaction t
adamc@908 158
adamc@566 159
adamc@678 160 (** Channels *)
adamc@678 161
adamc@678 162 con channel :: Type -> Type
adamc@678 163 val channel : t ::: Type -> transaction (channel t)
adamc@678 164 val send : t ::: Type -> channel t -> t -> transaction unit
adamc@678 165 val recv : t ::: Type -> channel t -> transaction t
adamc@678 166
adamc@682 167 type client
adamc@682 168 val self : transaction client
adamc@682 169
adamc@678 170
adamc@203 171 (** SQL *)
adamc@203 172
adamc@705 173 con sql_table :: {Type} -> {{Unit}} -> Type
adamc@753 174 con sql_view :: {Type} -> Type
adamc@753 175
adamc@753 176 class fieldsOf :: Type -> {Type} -> Type
adamc@753 177 val fieldsOf_table : fs ::: {Type} -> keys ::: {{Unit}}
adamc@753 178 -> fieldsOf (sql_table fs keys) fs
adamc@753 179 val fieldsOf_view : fs ::: {Type}
adamc@753 180 -> fieldsOf (sql_view fs) fs
adamc@203 181
adamc@704 182 (*** Constraints *)
adamc@704 183
adamc@707 184 (**** Primary keys *)
adamc@707 185
adamc@707 186 class sql_injectable_prim
adamc@707 187 val sql_bool : sql_injectable_prim bool
adamc@707 188 val sql_int : sql_injectable_prim int
adamc@707 189 val sql_float : sql_injectable_prim float
adamc@707 190 val sql_string : sql_injectable_prim string
adamc@1011 191 val sql_char : sql_injectable_prim char
adamc@707 192 val sql_time : sql_injectable_prim time
adamc@737 193 val sql_blob : sql_injectable_prim blob
adamc@707 194 val sql_channel : t ::: Type -> sql_injectable_prim (channel t)
adamc@707 195 val sql_client : sql_injectable_prim client
adamc@707 196
adamc@1104 197 con serialized :: Type -> Type
adamc@1104 198 val serialize : t ::: Type -> t -> serialized t
adamc@1104 199 val deserialize : t ::: Type -> serialized t -> t
adamc@1104 200 val sql_serialized : t ::: Type -> sql_injectable_prim (serialized t)
adamc@1104 201
adamc@707 202 con primary_key :: {Type} -> {{Unit}} -> Type
adamc@707 203 val no_primary_key : fs ::: {Type} -> primary_key fs []
adamc@707 204 val primary_key : rest ::: {Type} -> t ::: Type -> key1 :: Name -> keys :: {Type}
adamc@707 205 -> [[key1] ~ keys] => [[key1 = t] ++ keys ~ rest]
adamc@707 206 => $([key1 = sql_injectable_prim t] ++ map sql_injectable_prim keys)
adamc@707 207 -> primary_key ([key1 = t] ++ keys ++ rest)
adamc@707 208 [Pkey = [key1] ++ map (fn _ => ()) keys]
adamc@707 209
adamc@707 210 (**** Other constraints *)
adamc@707 211
adamc@705 212 con sql_constraints :: {Type} -> {{Unit}} -> Type
adamc@705 213 (* Arguments: column types, uniqueness implications of constraints *)
adamc@704 214
adamc@705 215 con sql_constraint :: {Type} -> {Unit} -> Type
adamc@704 216
adamc@705 217 val no_constraint : fs ::: {Type} -> sql_constraints fs []
adamc@705 218 val one_constraint : fs ::: {Type} -> unique ::: {Unit} -> name :: Name
adamc@705 219 -> sql_constraint fs unique
adamc@705 220 -> sql_constraints fs [name = unique]
adamc@705 221 val join_constraints : fs ::: {Type}
adamc@705 222 -> uniques1 ::: {{Unit}} -> uniques2 ::: {{Unit}} -> [uniques1 ~ uniques2]
adamc@705 223 => sql_constraints fs uniques1 -> sql_constraints fs uniques2
adamc@705 224 -> sql_constraints fs (uniques1 ++ uniques2)
adamc@705 225
adamc@709 226
adamc@705 227 val unique : rest ::: {Type} -> t ::: Type -> unique1 :: Name -> unique :: {Type}
adamc@705 228 -> [[unique1] ~ unique] => [[unique1 = t] ++ unique ~ rest]
adamc@705 229 => sql_constraint ([unique1 = t] ++ unique ++ rest) ([unique1] ++ map (fn _ => ()) unique)
adamc@704 230
adamc@712 231 class linkable :: Type -> Type -> Type
adamc@712 232 val linkable_same : t ::: Type -> linkable t t
adamc@712 233 val linkable_from_nullable : t ::: Type -> linkable (option t) t
adamc@712 234 val linkable_to_nullable : t ::: Type -> linkable t (option t)
adamc@712 235
adamc@709 236 con matching :: {Type} -> {Type} -> Type
adamc@709 237 val mat_nil : matching [] []
adamc@712 238 val mat_cons : t1 ::: Type -> rest1 ::: {Type} -> t2 ::: Type -> rest2 ::: {Type}
adamc@709 239 -> nm1 :: Name -> nm2 :: Name
adamc@709 240 -> [[nm1] ~ rest1] => [[nm2] ~ rest2]
adamc@712 241 => linkable t1 t2
adamc@712 242 -> matching rest1 rest2
adamc@712 243 -> matching ([nm1 = t1] ++ rest1) ([nm2 = t2] ++ rest2)
adamc@709 244
adamc@709 245 con propagation_mode :: {Type} -> Type
adamc@709 246 val restrict : fs ::: {Type} -> propagation_mode fs
adamc@709 247 val cascade : fs ::: {Type} -> propagation_mode fs
adamc@709 248 val no_action : fs ::: {Type} -> propagation_mode fs
adamc@709 249 val set_null : fs ::: {Type} -> propagation_mode (map option fs)
adamc@709 250
adamc@709 251
adamc@709 252 val foreign_key : mine1 ::: Name -> t ::: Type -> mine ::: {Type} -> munused ::: {Type}
adamc@709 253 -> foreign ::: {Type} -> funused ::: {Type}
adamc@709 254 -> nm ::: Name -> uniques ::: {{Unit}}
adamc@709 255 -> [[mine1] ~ mine] => [[mine1 = t] ++ mine ~ munused]
adamc@709 256 => [foreign ~ funused] => [[nm] ~ uniques]
adamc@709 257 => matching ([mine1 = t] ++ mine) foreign
adamc@709 258 -> sql_table (foreign ++ funused) ([nm = map (fn _ => ()) foreign] ++ uniques)
adamc@709 259 -> {OnDelete : propagation_mode ([mine1 = t] ++ mine),
adamc@709 260 OnUpdate : propagation_mode ([mine1 = t] ++ mine)}
adamc@709 261 -> sql_constraint ([mine1 = t] ++ mine ++ munused) []
adamc@709 262
adamc@714 263 con sql_exp :: {{Type}} -> {{Type}} -> {Type} -> Type -> Type
adamc@1072 264 val sql_exp_weaken : fs ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type} -> t ::: Type
adamc@1072 265 -> fs' ::: {{Type}} -> agg' ::: {{Type}} -> exps' ::: {Type}
adamc@1072 266 -> [fs ~ fs'] => [agg ~ agg'] => [exps ~ exps'] =>
adamc@1072 267 sql_exp fs agg exps t
adamc@1072 268 -> sql_exp (fs ++ fs') (agg ++ agg') (exps ++ exps') t
adamc@714 269
adamc@714 270 val check : fs ::: {Type}
adamc@714 271 -> sql_exp [] [] fs bool
adamc@714 272 -> sql_constraint fs []
adamc@714 273
adamc@714 274
adamc@204 275 (*** Queries *)
adamc@204 276
adamc@1191 277 con sql_query :: {{Type}} -> {{Type}} -> {Type} -> Type
adamc@1191 278 con sql_query1 :: {{Type}} -> {{Type}} -> {{Type}} -> {Type} -> Type
adamc@204 279
adamc@223 280 con sql_subset :: {{Type}} -> {{Type}} -> Type
adamc@223 281 val sql_subset : keep_drop :: {({Type} * {Type})}
adamc@354 282 -> sql_subset
adamc@621 283 (map (fn fields :: ({Type} * {Type}) => fields.1 ++ fields.2) keep_drop)
adamc@621 284 (map (fn fields :: ({Type} * {Type}) => fields.1) keep_drop)
adamc@354 285 val sql_subset_all : tables :: {{Type}} -> sql_subset tables tables
adamc@1072 286 val sql_subset_concat : big1 ::: {{Type}} -> little1 ::: {{Type}}
adamc@1072 287 -> big2 ::: {{Type}} -> little2 ::: {{Type}}
adamc@1072 288 -> [big1 ~ big2] => [little1 ~ little2] =>
adamc@1072 289 sql_subset big1 little1
adamc@1072 290 -> sql_subset big2 little2
adamc@1072 291 -> sql_subset (big1 ++ big2) (little1 ++ little2)
adamc@223 292
adamc@1191 293 con sql_from_items :: {{Type}} -> {{Type}} -> Type
adamc@748 294
adamc@1195 295 val sql_from_nil : free ::: {{Type}} -> sql_from_items free []
adamc@1191 296 val sql_from_table : free ::: {{Type}} -> t ::: Type -> fs ::: {Type}
adamc@753 297 -> fieldsOf t fs -> name :: Name
adamc@1191 298 -> t -> sql_from_items free [name = fs]
adamc@1192 299 val sql_from_query : free ::: {{Type}} -> fs ::: {Type} -> name :: Name
adamc@1192 300 -> sql_query free [] fs
adamc@1192 301 -> sql_from_items free [name = fs]
adamc@1191 302 val sql_from_comma : free ::: {{Type}} -> tabs1 ::: {{Type}} -> tabs2 ::: {{Type}}
adamc@748 303 -> [tabs1 ~ tabs2]
adamc@1191 304 => sql_from_items free tabs1 -> sql_from_items free tabs2
adamc@1191 305 -> sql_from_items free (tabs1 ++ tabs2)
adamc@1191 306 val sql_inner_join : free ::: {{Type}} -> tabs1 ::: {{Type}} -> tabs2 ::: {{Type}}
adamc@1191 307 -> [free ~ tabs1] => [free ~ tabs2] => [tabs1 ~ tabs2]
adamc@1191 308 => sql_from_items free tabs1 -> sql_from_items free tabs2
adamc@1191 309 -> sql_exp (free ++ tabs1 ++ tabs2) [] [] bool
adamc@1191 310 -> sql_from_items free (tabs1 ++ tabs2)
adamc@748 311
adamc@750 312 class nullify :: Type -> Type -> Type
adamc@750 313 val nullify_option : t ::: Type -> nullify (option t) (option t)
adamc@750 314 val nullify_prim : t ::: Type -> sql_injectable_prim t -> nullify t (option t)
adamc@750 315
adamc@1191 316 val sql_left_join : free ::: {{Type}} -> tabs1 ::: {{Type}} -> tabs2 ::: {{(Type * Type)}}
adamc@1191 317 -> [free ~ tabs1] => [free ~ tabs2] => [tabs1 ~ tabs2]
adamc@750 318 => $(map (fn r => $(map (fn p :: (Type * Type) => nullify p.1 p.2) r)) tabs2)
adamc@1191 319 -> sql_from_items free tabs1 -> sql_from_items free (map (map (fn p :: (Type * Type) => p.1)) tabs2)
adamc@1191 320 -> sql_exp (free ++ tabs1 ++ map (map (fn p :: (Type * Type) => p.1)) tabs2) [] [] bool
adamc@1191 321 -> sql_from_items free (tabs1 ++ map (map (fn p :: (Type * Type) => p.2)) tabs2)
adamc@750 322
adamc@1191 323 val sql_right_join : free ::: {{Type}} -> tabs1 ::: {{(Type * Type)}} -> tabs2 ::: {{Type}}
adamc@1191 324 -> [free ~ tabs1] => [free ~ tabs2] => [tabs1 ~ tabs2]
adamc@751 325 => $(map (fn r => $(map (fn p :: (Type * Type) => nullify p.1 p.2) r)) tabs1)
adamc@1191 326 -> sql_from_items free (map (map (fn p :: (Type * Type) => p.1)) tabs1) -> sql_from_items free tabs2
adamc@1191 327 -> sql_exp (free ++ map (map (fn p :: (Type * Type) => p.1)) tabs1 ++ tabs2) [] [] bool
adamc@1191 328 -> sql_from_items free (map (map (fn p :: (Type * Type) => p.2)) tabs1 ++ tabs2)
adamc@751 329
adamc@1191 330 val sql_full_join : free ::: {{Type}} -> tabs1 ::: {{(Type * Type)}} -> tabs2 ::: {{(Type * Type)}}
adamc@1191 331 -> [free ~ tabs1] => [free ~ tabs2] => [tabs1 ~ tabs2]
adamc@751 332 => $(map (fn r => $(map (fn p :: (Type * Type) => nullify p.1 p.2) r)) (tabs1 ++ tabs2))
adamc@1191 333 -> sql_from_items free (map (map (fn p :: (Type * Type) => p.1)) tabs1)
adamc@1191 334 -> sql_from_items free (map (map (fn p :: (Type * Type) => p.1)) tabs2)
adamc@1191 335 -> sql_exp (free ++ map (map (fn p :: (Type * Type) => p.1)) (tabs1 ++ tabs2)) [] [] bool
adamc@1191 336 -> sql_from_items free (map (map (fn p :: (Type * Type) => p.2)) (tabs1 ++ tabs2))
adamc@751 337
adamc@1191 338 val sql_query1 : free ::: {{Type}}
adamc@1191 339 -> tables ::: {{Type}}
adamc@354 340 -> grouped ::: {{Type}}
adamc@354 341 -> selectedFields ::: {{Type}}
adamc@354 342 -> selectedExps ::: {Type}
adamc@1070 343 -> empties :: {Unit}
adamc@1191 344 -> [free ~ tables]
adamc@1191 345 => [free ~ grouped]
adamc@1191 346 => [empties ~ selectedFields]
adamc@1070 347 => {Distinct : bool,
adamc@1191 348 From : sql_from_items free tables,
adamc@1191 349 Where : sql_exp (free ++ tables) [] [] bool,
adamc@748 350 GroupBy : sql_subset tables grouped,
adamc@1191 351 Having : sql_exp (free ++ grouped) tables [] bool,
adamc@1070 352 SelectFields : sql_subset grouped (map (fn _ => []) empties ++ selectedFields),
adamc@1191 353 SelectExps : $(map (sql_exp (free ++ grouped) tables [])
adamc@705 354 selectedExps) }
adamc@1191 355 -> sql_query1 free tables selectedFields selectedExps
adamc@229 356
adamc@229 357 type sql_relop
adamc@229 358 val sql_union : sql_relop
adamc@229 359 val sql_intersect : sql_relop
adamc@229 360 val sql_except : sql_relop
adamc@1191 361 val sql_relop : free ::: {{Type}}
adamc@1191 362 -> tables1 ::: {{Type}}
adamc@354 363 -> tables2 ::: {{Type}}
adamc@354 364 -> selectedFields ::: {{Type}}
adamc@354 365 -> selectedExps ::: {Type}
adamc@354 366 -> sql_relop
adamc@1191 367 -> sql_query1 free tables1 selectedFields selectedExps
adamc@1191 368 -> sql_query1 free tables2 selectedFields selectedExps
adamc@1191 369 -> sql_query1 free [] selectedFields selectedExps
adamc@1191 370 val sql_forget_tables : free ::: {{Type}} -> tables ::: {{Type}} -> selectedFields ::: {{Type}} -> selectedExps ::: {Type}
adamc@1191 371 -> sql_query1 free tables selectedFields selectedExps
adamc@1191 372 -> sql_query1 free [] selectedFields selectedExps
adamc@229 373
adamc@230 374 type sql_direction
adamc@230 375 val sql_asc : sql_direction
adamc@230 376 val sql_desc : sql_direction
adamc@230 377
adamc@234 378 con sql_order_by :: {{Type}} -> {Type} -> Type
adamc@234 379 val sql_order_by_Nil : tables ::: {{Type}} -> exps :: {Type} -> sql_order_by tables exps
adamc@234 380 val sql_order_by_Cons : tables ::: {{Type}} -> exps ::: {Type} -> t ::: Type
adamc@354 381 -> sql_exp tables [] exps t -> sql_direction
adamc@354 382 -> sql_order_by tables exps
adamc@354 383 -> sql_order_by tables exps
adamc@230 384
adamc@231 385 type sql_limit
adamc@231 386 val sql_no_limit : sql_limit
adamc@231 387 val sql_limit : int -> sql_limit
adamc@354 388
adamc@232 389 type sql_offset
adamc@232 390 val sql_no_offset : sql_offset
adamc@232 391 val sql_offset : int -> sql_offset
adamc@232 392
adamc@1191 393 val sql_query : free ::: {{Type}}
adamc@1191 394 -> tables ::: {{Type}}
adamc@354 395 -> selectedFields ::: {{Type}}
adamc@354 396 -> selectedExps ::: {Type}
adamc@1191 397 -> [free ~ tables]
adamc@1191 398 => {Rows : sql_query1 free tables selectedFields selectedExps,
adamc@1191 399 OrderBy : sql_order_by (free ++ tables) selectedExps,
adamc@354 400 Limit : sql_limit,
adamc@354 401 Offset : sql_offset}
adamc@1191 402 -> sql_query free selectedFields selectedExps
adamc@204 403
adamc@354 404 val sql_field : otherTabs ::: {{Type}} -> otherFields ::: {Type}
adamc@354 405 -> fieldType ::: Type -> agg ::: {{Type}}
adamc@354 406 -> exps ::: {Type}
adamc@354 407 -> tab :: Name -> field :: Name
adamc@354 408 -> sql_exp
adamc@354 409 ([tab = [field = fieldType] ++ otherFields] ++ otherTabs)
adamc@354 410 agg exps fieldType
adamc@234 411
adamc@354 412 val sql_exp : tabs ::: {{Type}} -> agg ::: {{Type}} -> t ::: Type -> rest ::: {Type}
adamc@354 413 -> nm :: Name
adamc@354 414 -> sql_exp tabs agg ([nm = t] ++ rest) t
adamc@209 415
adamc@221 416 class sql_injectable
adamc@676 417 val sql_prim : t ::: Type -> sql_injectable_prim t -> sql_injectable t
adamc@676 418 val sql_option_prim : t ::: Type -> sql_injectable_prim t -> sql_injectable (option t)
adamc@676 419
adamc@354 420 val sql_inject : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}
adamc@354 421 -> t ::: Type
adamc@354 422 -> sql_injectable t -> t -> sql_exp tables agg exps t
adamc@209 423
adamc@470 424 val sql_is_null : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}
adamc@470 425 -> t ::: Type
adamc@470 426 -> sql_exp tables agg exps (option t)
adamc@470 427 -> sql_exp tables agg exps bool
adamc@470 428
adamc@559 429 class sql_arith
adamc@559 430 val sql_int_arith : sql_arith int
adamc@559 431 val sql_float_arith : sql_arith float
adamc@559 432
adamc@220 433 con sql_unary :: Type -> Type -> Type
adamc@220 434 val sql_not : sql_unary bool bool
adamc@354 435 val sql_unary : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}
adamc@354 436 -> arg ::: Type -> res ::: Type
adamc@354 437 -> sql_unary arg res -> sql_exp tables agg exps arg
adamc@354 438 -> sql_exp tables agg exps res
adamc@220 439
adamc@559 440 val sql_neg : t ::: Type -> sql_arith t -> sql_unary t t
adamc@559 441
adamc@220 442 con sql_binary :: Type -> Type -> Type -> Type
adamc@220 443 val sql_and : sql_binary bool bool bool
adamc@220 444 val sql_or : sql_binary bool bool bool
adamc@234 445 val sql_binary : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}
adamc@354 446 -> arg1 ::: Type -> arg2 ::: Type -> res ::: Type
adamc@354 447 -> sql_binary arg1 arg2 res -> sql_exp tables agg exps arg1
adamc@354 448 -> sql_exp tables agg exps arg2
adamc@354 449 -> sql_exp tables agg exps res
adamc@220 450
adamc@559 451 val sql_plus : t ::: Type -> sql_arith t -> sql_binary t t t
adamc@559 452 val sql_minus : t ::: Type -> sql_arith t -> sql_binary t t t
adamc@559 453 val sql_times : t ::: Type -> sql_arith t -> sql_binary t t t
adamc@559 454 val sql_div : t ::: Type -> sql_arith t -> sql_binary t t t
adamc@559 455 val sql_mod : sql_binary int int int
adamc@559 456
adamc@559 457 val sql_eq : t ::: Type -> sql_binary t t bool
adamc@559 458 val sql_ne : t ::: Type -> sql_binary t t bool
adamc@559 459 val sql_lt : t ::: Type -> sql_binary t t bool
adamc@559 460 val sql_le : t ::: Type -> sql_binary t t bool
adamc@559 461 val sql_gt : t ::: Type -> sql_binary t t bool
adamc@559 462 val sql_ge : t ::: Type -> sql_binary t t bool
adamc@203 463
adamc@235 464 val sql_count : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}
adamc@544 465 -> sql_exp tables agg exps int
adamc@235 466
adamc@1187 467 con sql_aggregate :: Type -> Type -> Type
adamc@354 468 val sql_aggregate : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}
adamc@1187 469 -> dom ::: Type -> ran ::: Type
adamc@1187 470 -> sql_aggregate dom ran -> sql_exp agg agg exps dom
adamc@1187 471 -> sql_exp tables agg exps ran
adamc@1187 472
adamc@1187 473 val sql_count_col : t ::: Type -> sql_aggregate (option t) int
adamc@236 474
adamc@236 475 class sql_summable
adamc@236 476 val sql_summable_int : sql_summable int
adamc@236 477 val sql_summable_float : sql_summable float
adamc@1187 478 val sql_avg : t ::: Type -> sql_summable t -> sql_aggregate t t
adamc@1187 479 val sql_sum : t ::: Type -> sql_summable t -> sql_aggregate t t
adamc@236 480
adamc@236 481 class sql_maxable
adamc@236 482 val sql_maxable_int : sql_maxable int
adamc@236 483 val sql_maxable_float : sql_maxable float
adamc@236 484 val sql_maxable_string : sql_maxable string
adamc@437 485 val sql_maxable_time : sql_maxable time
adamc@1187 486 val sql_max : t ::: Type -> sql_maxable t -> sql_aggregate t t
adamc@1187 487 val sql_min : t ::: Type -> sql_maxable t -> sql_aggregate t t
adamc@236 488
adamc@441 489 con sql_nfunc :: Type -> Type
adamc@441 490 val sql_nfunc : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}
adamc@441 491 -> t ::: Type
adamc@441 492 -> sql_nfunc t -> sql_exp tables agg exps t
adamc@441 493 val sql_current_timestamp : sql_nfunc time
adamc@441 494
adamc@746 495 con sql_ufunc :: Type -> Type -> Type
adamc@746 496 val sql_ufunc : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type}
adamc@746 497 -> dom ::: Type -> ran ::: Type
adamc@746 498 -> sql_ufunc dom ran -> sql_exp tables agg exps dom
adamc@746 499 -> sql_exp tables agg exps ran
adamc@746 500 val sql_octet_length : sql_ufunc blob int
adamc@746 501
adamc@235 502
adamc@1081 503 val sql_nullable : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type} -> t ::: Type
adamc@1081 504 -> sql_injectable_prim t
adamc@1081 505 -> sql_exp tables agg exps t
adamc@1081 506 -> sql_exp tables agg exps (option t)
adamc@1081 507
adamc@1191 508 val sql_subquery : tables ::: {{Type}} -> agg ::: {{Type}} -> exps ::: {Type} -> nm ::: Name -> t ::: Type
adamc@1191 509 -> sql_query tables [] [nm = t]
adamc@1191 510 -> sql_exp tables agg exps t
adamc@1191 511
adamc@243 512 (*** Executing queries *)
adamc@243 513
adamc@354 514 val query : tables ::: {{Type}} -> exps ::: {Type}
adamc@629 515 -> [tables ~ exps] =>
adamc@354 516 state ::: Type
adamc@1191 517 -> sql_query [] tables exps
adamc@621 518 -> ($(exps ++ map (fn fields :: {Type} => $fields) tables)
adamc@354 519 -> state
adamc@354 520 -> transaction state)
adamc@354 521 -> state
adamc@354 522 -> transaction state
adamc@243 523
adamc@243 524
adamc@299 525 (*** Database mutators *)
adamc@299 526
adamc@299 527 type dml
adamc@299 528 val dml : dml -> transaction unit
adamc@299 529
adamc@705 530 val insert : fields ::: {Type} -> uniques ::: {{Unit}}
adamc@705 531 -> sql_table fields uniques
adamc@621 532 -> $(map (fn t :: Type => sql_exp [] [] [] t) fields)
adamc@354 533 -> dml
adamc@299 534
adamc@705 535 val update : unchanged ::: {Type} -> uniques ::: {{Unit}} -> changed :: {Type} ->
adamc@629 536 [changed ~ unchanged] =>
adamc@621 537 $(map (fn t :: Type => sql_exp [T = changed ++ unchanged] [] [] t) changed)
adamc@705 538 -> sql_table (changed ++ unchanged) uniques
adamc@354 539 -> sql_exp [T = changed ++ unchanged] [] [] bool
adamc@354 540 -> dml
adamc@299 541
adamc@705 542 val delete : fields ::: {Type} -> uniques ::: {{Unit}}
adamc@705 543 -> sql_table fields uniques
adamc@354 544 -> sql_exp [T = fields] [] [] bool
adamc@354 545 -> dml
adamc@299 546
adamc@338 547 (*** Sequences *)
adamc@338 548
adamc@338 549 type sql_sequence
adamc@338 550 val nextval : sql_sequence -> transaction int
adamc@1073 551 val setval : sql_sequence -> int -> transaction unit
adamc@338 552
adamc@299 553
adamc@203 554 (** XML *)
adamc@203 555
adamc@721 556 type css_class
adamc@718 557
adamc@720 558 con tag :: {Type} -> {Unit} -> {Unit} -> {Type} -> {Type} -> Type
adamc@91 559
adamc@720 560 con xml :: {Unit} -> {Type} -> {Type} -> Type
adamc@720 561 val cdata : ctx ::: {Unit} -> use ::: {Type} -> string -> xml ctx use []
adamc@354 562 val tag : attrsGiven ::: {Type} -> attrsAbsent ::: {Type}
adamc@354 563 -> ctxOuter ::: {Unit} -> ctxInner ::: {Unit}
adamc@354 564 -> useOuter ::: {Type} -> useInner ::: {Type}
adamc@354 565 -> bindOuter ::: {Type} -> bindInner ::: {Type}
adamc@629 566 -> [attrsGiven ~ attrsAbsent] =>
adamc@629 567 [useOuter ~ useInner] =>
adamc@629 568 [bindOuter ~ bindInner] =>
adamc@721 569 option css_class
adamc@721 570 -> $attrsGiven
adamc@629 571 -> tag (attrsGiven ++ attrsAbsent)
adamc@720 572 ctxOuter ctxInner useOuter bindOuter
adamc@720 573 -> xml ctxInner useInner bindInner
adamc@720 574 -> xml ctxOuter (useOuter ++ useInner) (bindOuter ++ bindInner)
adamc@140 575 val join : ctx ::: {Unit}
adamc@720 576 -> use1 ::: {Type} -> bind1 ::: {Type} -> bind2 ::: {Type}
adamc@720 577 -> [use1 ~ bind1] => [bind1 ~ bind2] =>
adamc@720 578 xml ctx use1 bind1
adamc@720 579 -> xml ctx (use1 ++ bind1) bind2
adamc@720 580 -> xml ctx use1 (bind1 ++ bind2)
adamc@354 581 val useMore : ctx ::: {Unit} -> use1 ::: {Type} -> use2 ::: {Type}
adamc@720 582 -> bind ::: {Type}
adamc@629 583 -> [use1 ~ use2] =>
adamc@720 584 xml ctx use1 bind
adamc@720 585 -> xml ctx (use1 ++ use2) bind
adamc@91 586
adamc@110 587 con xhtml = xml [Html]
adamc@139 588 con page = xhtml [] []
adamc@720 589 con xbody = xml [Body] [] []
adamc@720 590 con xtr = xml [Body, Tr] [] []
adamc@720 591 con xform = xml [Body, Form] [] []
adamc@110 592
adamc@718 593
adamc@204 594 (*** HTML details *)
adamc@204 595
adamc@140 596 con html = [Html]
adamc@140 597 con head = [Head]
adamc@140 598 con body = [Body]
adamc@361 599 con form = [Body, Form]
adamc@760 600 con subform = [Body, Subform]
adamc@332 601 con tabl = [Body, Table]
adamc@332 602 con tr = [Body, Tr]
adamc@93 603
adamc@724 604 type url
adamc@1065 605 val show_url : show url
adamc@724 606 val bless : string -> url
adamc@770 607 val checkUrl : string -> option url
adamc@1085 608 val currentUrl : transaction url
adamc@1065 609 val url : transaction page -> url
adamc@1065 610 val redirect : t ::: Type -> url -> transaction t
adamc@724 611
adamc@847 612 val dyn : ctx ::: {Unit} -> use ::: {Type} -> bind ::: {Type} -> [ctx ~ body] => unit
adamc@847 613 -> tag [Signal = signal (xml (body ++ ctx) use bind)] (body ++ ctx) [] use bind
adamc@568 614
adamc@720 615 val head : unit -> tag [] html head [] []
adamc@720 616 val title : unit -> tag [] head [] [] []
adamc@1047 617 val link : unit -> tag [Id = string, Rel = string, Typ = string, Href = url, Media = string] head [] [] []
adamc@110 618
adamc@892 619 val body : unit -> tag [Onload = transaction unit, Onresize = transaction unit, Onunload = transaction unit]
adamc@892 620 html body [] []
adamc@354 621 con bodyTag = fn (attrs :: {Type}) =>
adamc@354 622 ctx ::: {Unit} ->
adamc@629 623 [[Body] ~ ctx] =>
adamc@720 624 unit -> tag attrs ([Body] ++ ctx) ([Body] ++ ctx) [] []
adamc@354 625 con bodyTagStandalone = fn (attrs :: {Type}) =>
adamc@354 626 ctx ::: {Unit}
adamc@629 627 -> [[Body] ~ ctx] =>
adamc@720 628 unit -> tag attrs ([Body] ++ ctx) [] [] []
adamc@141 629
adamc@1047 630 val br : bodyTagStandalone [Id = int]
adamc@119 631
adamc@892 632 con focusEvents = [Onblur = transaction unit, Onfocus = transaction unit]
adamc@892 633 con mouseEvents = [Onclick = transaction unit, Ondblclick = transaction unit,
adamc@892 634 Onmousedown = transaction unit, Onmousemove = transaction unit,
adamc@892 635 Onmouseout = transaction unit, Onmouseover = transaction unit,
adamc@894 636 Onmouseup = transaction unit]
adamc@895 637 con keyEvents = [Onkeydown = int -> transaction unit, Onkeypress = int -> transaction unit,
adamc@895 638 Onkeyup = int -> transaction unit]
adamc@895 639 (* Key arguments are character codes. *)
adamc@892 640 con resizeEvents = [Onresize = transaction unit]
adamc@691 641
adamc@892 642 con boxEvents = focusEvents ++ mouseEvents ++ keyEvents ++ resizeEvents
adamc@892 643 con tableEvents = focusEvents ++ mouseEvents ++ keyEvents
adamc@140 644
adamc@1047 645 con boxAttrs = [Id = string] ++ boxEvents
adamc@1047 646 con tableAttrs = [Id = string] ++ tableEvents
adamc@469 647
adamc@1047 648 val span : bodyTag boxAttrs
adamc@1047 649 val div : bodyTag boxAttrs
adamc@140 650
adamc@1047 651 val p : bodyTag boxAttrs
adamc@1047 652 val b : bodyTag boxAttrs
adamc@1047 653 val i : bodyTag boxAttrs
adamc@1047 654 val tt : bodyTag boxAttrs
adamc@410 655
adamc@1047 656 val h1 : bodyTag boxAttrs
adamc@1047 657 val h2 : bodyTag boxAttrs
adamc@1047 658 val h3 : bodyTag boxAttrs
adamc@1047 659 val h4 : bodyTag boxAttrs
adamc@1047 660 val h5 : bodyTag boxAttrs
adamc@1047 661 val h6 : bodyTag boxAttrs
adamc@717 662
adamc@1047 663 val li : bodyTag boxAttrs
adamc@1047 664 val ol : bodyTag boxAttrs
adamc@1047 665 val ul : bodyTag boxAttrs
adamc@140 666
adamc@1047 667 val hr : bodyTag boxAttrs
adamc@1047 668
adamc@1047 669 val a : bodyTag ([Link = transaction page, Href = url] ++ boxAttrs)
adamc@892 670
adamc@1129 671 val img : bodyTag ([Src = url, Width = int, Height = int,
adamc@1129 672 Onabort = transaction unit, Onerror = transaction unit,
adamc@1047 673 Onload = transaction unit] ++ boxAttrs)
adamc@892 674
adamc@720 675 val form : ctx ::: {Unit} -> bind ::: {Type}
adamc@1120 676 -> [[Body, Form, Table] ~ ctx] =>
adamc@1004 677 xml ([Body, Form] ++ ctx) [] bind
adamc@756 678 -> xml ([Body] ++ ctx) [] []
adamc@756 679
adamc@756 680 val subform : ctx ::: {Unit} -> use ::: {Type} -> bind ::: {Type}
adamc@756 681 -> [[Form] ~ ctx] =>
adamc@756 682 nm :: Name -> [[nm] ~ use] =>
adamc@1004 683 xml ([Form] ++ ctx) [] bind
adamc@756 684 -> xml ([Form] ++ ctx) use [nm = $bind]
adamc@758 685
adamc@758 686 val subforms : ctx ::: {Unit} -> use ::: {Type} -> bind ::: {Type}
adamc@1004 687 -> [[Form, Subform] ~ ctx] =>
adamc@758 688 nm :: Name -> [[nm] ~ use] =>
adamc@1004 689 xml ([Subform] ++ ctx) [Entry = $bind] []
adamc@758 690 -> xml ([Form] ++ ctx) use [nm = list ($bind)]
adamc@758 691
adamc@758 692 val entry : ctx ::: {Unit} -> bind ::: {Type}
adamc@1004 693 -> [[Subform, Form] ~ ctx] =>
adamc@1004 694 xml ([Form] ++ ctx) [] bind
adamc@758 695 -> xml ([Subform] ++ ctx) [Entry = $bind] []
adamc@758 696
adamc@361 697 con formTag = fn (ty :: Type) (inner :: {Unit}) (attrs :: {Type}) =>
adamc@354 698 ctx ::: {Unit}
adamc@629 699 -> [[Form] ~ ctx] =>
adamc@354 700 nm :: Name -> unit
adamc@720 701 -> tag attrs ([Form] ++ ctx) inner [] [nm = ty]
adamc@1047 702 val hidden : formTag string [] [Id = string, Value = string]
adamc@892 703 val textbox : formTag string [] ([Value = string, Size = int, Source = source string, Onchange = transaction unit,
adamc@1047 704 Ontext = transaction unit] ++ boxAttrs)
adamc@1047 705 val password : formTag string [] ([Value = string, Size = int] ++ boxAttrs)
adamc@892 706 val textarea : formTag string [] ([Rows = int, Cols = int, Onchange = transaction unit,
adamc@1047 707 Ontext = transaction unit] ++ boxAttrs)
adamc@153 708
adamc@1047 709 val checkbox : formTag bool [] ([Checked = bool] ++ boxAttrs)
adamc@190 710
adamc@737 711 type file
adamc@737 712 val fileName : file -> option string
adamc@740 713 val fileMimeType : file -> string
adamc@737 714 val fileData : file -> blob
adamc@737 715
adamc@1047 716 val upload : formTag file [] ([Value = string, Size = int] ++ boxAttrs)
adamc@737 717
adamc@741 718 type mimeType
adamc@741 719 val blessMime : string -> mimeType
adamc@770 720 val checkMime : string -> option mimeType
adamc@741 721 val returnBlob : t ::: Type -> blob -> mimeType -> transaction t
adamc@745 722 val blobSize : blob -> int
adamc@1119 723 val textBlob : string -> blob
adamc@741 724
adamc@153 725 con radio = [Body, Radio]
adamc@1047 726 val radio : formTag string radio [Id = string]
adamc@1068 727 val radioOption : unit -> tag ([Value = string, Checked = bool] ++ boxAttrs) radio [] [] []
adamc@142 728
adamc@154 729 con select = [Select]
adamc@1047 730 val select : formTag string select ([Onchange = transaction unit] ++ boxAttrs)
adamc@720 731 val option : unit -> tag [Value = string, Selected = bool] select [] [] []
adamc@154 732
adamc@720 733 val submit : ctx ::: {Unit} -> use ::: {Type}
adamc@629 734 -> [[Form] ~ ctx] =>
adamc@354 735 unit
adamc@1047 736 -> tag ([Value = string, Action = $use -> transaction page] ++ boxAttrs)
adamc@720 737 ([Form] ++ ctx) ([Form] ++ ctx) use []
adamc@283 738
adamc@1047 739 val label : bodyTag ([For = string, Accesskey = string] ++ tableAttrs)
adamc@1047 740
adamc@1047 741
adamc@601 742 (*** AJAX-oriented widgets *)
adamc@601 743
adamc@797 744 con cformTag = fn (attrs :: {Type}) (inner :: {Unit}) =>
adamc@601 745 ctx ::: {Unit}
adamc@629 746 -> [[Body] ~ ctx] =>
adamc@797 747 unit -> tag attrs ([Body] ++ ctx) inner [] []
adamc@601 748
adamc@892 749 val ctextbox : cformTag ([Value = string, Size = int, Source = source string, Onchange = transaction unit,
adamc@1047 750 Ontext = transaction unit] ++ boxAttrs) []
adamc@1047 751 val button : cformTag ([Value = string] ++ boxAttrs) []
adamc@797 752
adamc@1047 753 val ccheckbox : cformTag ([Value = bool, Size = int, Source = source bool] ++ boxAttrs) []
adamc@817 754
adamc@797 755 con cselect = [Cselect]
adamc@1047 756 val cselect : cformTag ([Source = source string, Onchange = transaction unit] ++ boxAttrs) cselect
adamc@797 757 val coption : unit -> tag [Value = string, Selected = bool] cselect [] [] []
adamc@601 758
adamc@1099 759 val ctextarea : cformTag ([Value = string, Rows = int, Cols = int, Source = source string, Onchange = transaction unit,
adamc@1099 760 Ontext = transaction unit] ++ boxAttrs) []
adamc@1099 761
adamc@720 762 (*** Tables *)
adamc@720 763
adamc@892 764 val tabl : other ::: {Unit} -> [other ~ [Body, Table]] => unit
adamc@1047 765 -> tag ([Border = int] ++ boxAttrs)
adamc@892 766 ([Body] ++ other) ([Body, Table] ++ other) [] []
adamc@892 767 val tr : other ::: {Unit} -> [other ~ [Body, Table, Tr]] => unit
adamc@1047 768 -> tag tableAttrs
adamc@892 769 ([Body, Table] ++ other) ([Body, Tr] ++ other) [] []
adamc@892 770 val th : other ::: {Unit} -> [other ~ [Body, Tr]] => unit
adamc@1047 771 -> tag ([Colspan = int] ++ tableAttrs)
adamc@892 772 ([Body, Tr] ++ other) ([Body] ++ other) [] []
adamc@892 773 val td : other ::: {Unit} -> [other ~ [Body, Tr]] => unit
adamc@1047 774 -> tag ([Colspan = int] ++ tableAttrs)
adamc@892 775 ([Body, Tr] ++ other) ([Body] ++ other) [] []
adamc@720 776
adamc@283 777
adamc@283 778 (** Aborting *)
adamc@283 779
adamc@726 780 val error : t ::: Type -> xbody -> t
adamc@720 781
adamc@729 782 (* Client-side-only handlers: *)
adamc@726 783 val onError : (xbody -> transaction unit) -> transaction unit
adamc@728 784 val onFail : (string -> transaction unit) -> transaction unit
adamc@729 785 val onConnectFail : transaction unit -> transaction unit
adamc@729 786 val onDisconnect : transaction unit -> transaction unit
adamc@729 787 val onServerError : (string -> transaction unit) -> transaction unit
adamc@727 788
adamc@727 789 val show_xml : ctx ::: {Unit} -> use ::: {Type} -> bind ::: {Type} -> show (xml ctx use bind)
adamc@1075 790
adamc@1075 791
adamc@1075 792 (** Tasks *)
adamc@1075 793
adamc@1075 794 type task_kind
adamc@1075 795 val initialize : task_kind
adamc@1120 796
adamc@1120 797
adamc@1199 798 (** Information flow security *)
adamc@1199 799
adamc@1199 800 type sql_policy
adamc@1199 801
adamc@1199 802 val query_policy : tables ::: {{Type}} -> exps ::: {Type}
adamc@1199 803 -> [tables ~ exps] => sql_query [] tables exps
adamc@1199 804 -> sql_policy
adamc@1199 805
adamc@1199 806
adamc@1120 807 val debug : string -> transaction unit