| 1 | structure Poll :> POLL = |
| 2 | struct |
| 3 | |
| 4 | open Util Sql Init |
| 5 | |
| 6 | type poll = {id : int, usr : int, title : string, descr : string, starts : string, ends : string, votes : int} |
| 7 | |
| 8 | fun mkPollRow [id, usr, title, descr, starts, ends, votes] = |
| 9 | {id = C.intFromSql id, usr = C.intFromSql usr, title = C.stringFromSql title, |
| 10 | descr = C.stringFromSql descr, starts = C.stringFromSql starts, |
| 11 | ends = C.stringFromSql ends, votes = C.intFromSql votes} |
| 12 | | mkPollRow row = Init.rowError ("poll", row) |
| 13 | |
| 14 | fun lookupPoll id = |
| 15 | case C.oneOrNoRows (getDb ()) ($`SELECT id, usr, title, descr, starts, ends, votes |
| 16 | FROM Poll |
| 17 | WHERE id = ^(C.intToSql id)`) of |
| 18 | NONE => raise Fail "Poll not found" |
| 19 | | SOME row => mkPollRow row |
| 20 | |
| 21 | fun listPolls () = |
| 22 | C.map (getDb ()) mkPollRow ($`SELECT id, usr, title, descr, starts, ends, votes |
| 23 | FROM Poll |
| 24 | ORDER BY ends, starts DESC, title`) |
| 25 | |
| 26 | fun listCurrentPolls () = |
| 27 | C.map (getDb ()) mkPollRow ($`SELECT id, usr, title, descr, starts, ends, votes |
| 28 | FROM Poll |
| 29 | WHERE EXTRACT(EPOCH FROM starts) <= EXTRACT(EPOCH FROM CURRENT_DATE) |
| 30 | AND EXTRACT(EPOCH FROM ends) >= EXTRACT(EPOCH FROM CURRENT_DATE) |
| 31 | ORDER BY ends, starts DESC, title`) |
| 32 | |
| 33 | fun listPollsLimit lim = |
| 34 | C.map (getDb ()) mkPollRow ($`SELECT id, usr, title, descr, starts, ends, votes |
| 35 | FROM Poll |
| 36 | ORDER BY starts DESC, ends, title |
| 37 | LIMIT ^(C.intToSql lim)`) |
| 38 | |
| 39 | fun addPoll (usr, title, descr, starts, ends, votes) = |
| 40 | let |
| 41 | val db = getDb () |
| 42 | val id = nextSeq (db, "PollSeq") |
| 43 | in |
| 44 | C.dml db ($`INSERT INTO Poll (id, usr, title, descr, starts, ends, votes) |
| 45 | VALUES (^(C.intToSql id), ^(C.intToSql usr), ^(C.stringToSql title), ^(C.stringToSql descr), |
| 46 | ^(C.stringToSql starts), ^(C.stringToSql ends), ^(C.intToSql votes))`); |
| 47 | id |
| 48 | end |
| 49 | |
| 50 | fun modPoll (poll : poll) = |
| 51 | let |
| 52 | val db = getDb () |
| 53 | in |
| 54 | ignore (C.dml db ($`UPDATE Poll SET |
| 55 | usr = ^(C.intToSql (#usr poll)), title = ^(C.stringToSql (#title poll)), |
| 56 | descr = ^(C.stringToSql (#descr poll)), |
| 57 | starts = ^(C.stringToSql (#starts poll)), ends = ^(C.stringToSql (#ends poll)), |
| 58 | votes = ^(C.intToSql (#votes poll)) |
| 59 | WHERE id = ^(C.intToSql (#id poll))`)) |
| 60 | end |
| 61 | |
| 62 | fun deletePoll id = |
| 63 | ignore (C.dml (getDb ()) ($`DELETE FROM Poll WHERE id = ^(C.intToSql id)`)) |
| 64 | |
| 65 | |
| 66 | (* Poll choices *) |
| 67 | |
| 68 | type choice = {id : int, pol : int, seq : real, descr : string} |
| 69 | |
| 70 | fun mkChoiceRow [id, pol, seq, descr] = |
| 71 | {id = C.intFromSql id, pol = C.intFromSql pol, |
| 72 | seq = C.realFromSql seq, descr = C.stringFromSql descr} |
| 73 | | mkChoiceRow row = Init.rowError ("choice", row) |
| 74 | |
| 75 | fun lookupChoice id = |
| 76 | case C.oneOrNoRows (getDb ()) ($`SELECT id, pol, seq, descr |
| 77 | FROM PollChoice |
| 78 | WHERE id = ^(C.intToSql id)`) of |
| 79 | NONE => raise Fail "Poll choice not found" |
| 80 | | SOME row => mkChoiceRow row |
| 81 | |
| 82 | fun listChoices pol = |
| 83 | C.map (getDb ()) mkChoiceRow ($`SELECT id, pol, seq, descr |
| 84 | FROM PollChoice |
| 85 | WHERE pol = ^(C.intToSql pol) |
| 86 | ORDER BY seq`) |
| 87 | |
| 88 | val mkChoiceRow' = |
| 89 | fn (yours :: total :: rest) => (not (C.isNull yours) andalso C.intFromSql yours <> 0, |
| 90 | if C.isNull total then 0 else C.intFromSql total, mkChoiceRow rest) |
| 91 | | row => Init.rowError ("choice'", row) |
| 92 | |
| 93 | fun listChoicesWithVotes pol = |
| 94 | C.map (getDb ()) mkChoiceRow' ($`SELECT (SELECT COUNT( * ) FROM Vote V WHERE V.cho = id AND V.usr = ^(C.intToSql (Init.getUserId ()))), |
| 95 | (SELECT COUNT( * ) FROM Vote V WHERE V.cho = id) AS total, id, pol, seq, descr |
| 96 | FROM PollChoice |
| 97 | WHERE pol = ^(C.intToSql pol) |
| 98 | ORDER BY total DESC, seq`) |
| 99 | |
| 100 | val mkChoiceRow'' = |
| 101 | fn (yours :: rest) => (not (C.isNull yours) andalso C.intFromSql yours <> 0, |
| 102 | mkChoiceRow rest) |
| 103 | | row => Init.rowError ("choice''", row) |
| 104 | |
| 105 | fun listChoicesWithMyVotes pol = |
| 106 | C.map (getDb ()) mkChoiceRow'' ($`SELECT (SELECT COUNT( * ) FROM Vote V WHERE V.cho = id AND V.usr = ^(C.intToSql (Init.getUserId ()))), |
| 107 | id, pol, seq, descr |
| 108 | FROM PollChoice |
| 109 | WHERE pol = ^(C.intToSql pol) |
| 110 | ORDER BY seq`) |
| 111 | |
| 112 | fun addChoice (pol, seq, descr) = |
| 113 | let |
| 114 | val db = getDb () |
| 115 | val id = nextSeq (db, "PollChoiceSeq") |
| 116 | in |
| 117 | C.dml db ($`INSERT INTO PollChoice (id, pol, seq, descr) |
| 118 | VALUES (^(C.intToSql id), ^(C.intToSql pol), ^(C.realToSql seq), ^(C.stringToSql descr))`); |
| 119 | id |
| 120 | end |
| 121 | |
| 122 | fun modChoice (choice : choice) = |
| 123 | let |
| 124 | val db = getDb () |
| 125 | in |
| 126 | ignore (C.dml db ($`UPDATE PollChoice SET |
| 127 | pol = ^(C.intToSql (#pol choice)), seq = ^(C.realToSql (#seq choice)), |
| 128 | descr = ^(C.stringToSql (#descr choice)) |
| 129 | WHERE id = ^(C.intToSql (#id choice))`)) |
| 130 | end |
| 131 | |
| 132 | fun deleteChoice id = |
| 133 | ignore (C.dml (getDb ()) ($`DELETE FROM PollChoice WHERE id = ^(C.intToSql id)`)) |
| 134 | |
| 135 | |
| 136 | (* Member voting *) |
| 137 | |
| 138 | fun vote (usr, pol, chos) = |
| 139 | let |
| 140 | val db = getDb () |
| 141 | |
| 142 | fun voteOnce cho = |
| 143 | ignore (C.dml db ($`INSERT INTO Vote (usr, cho) VALUES (^(C.intToSql usr), ^(C.intToSql cho))`)) |
| 144 | in |
| 145 | ignore (C.dml db ($`DELETE FROM Vote WHERE cho IN (SELECT id FROM PollChoice WHERE pol = ^(C.intToSql pol)) AND usr = ^(C.intToSql usr)`)); |
| 146 | app voteOnce chos |
| 147 | end |
| 148 | |
| 149 | |
| 150 | (* Date comparison *) |
| 151 | |
| 152 | fun dateLe (d1, d2) = |
| 153 | case C.oneRow (getDb ()) ($`SELECT (EXTRACT(EPOCH FROM DATE ^(C.stringToSql d1)) <= EXTRACT(EPOCH FROM DATE ^(C.stringToSql d2)))`) of |
| 154 | [res] => C.boolFromSql res |
| 155 | | row => Init.rowError ("dateLe", row) |
| 156 | |
| 157 | fun dateGeNow d = |
| 158 | case C.oneRow (getDb ()) ($`SELECT (EXTRACT(EPOCH FROM CURRENT_DATE) <= EXTRACT(EPOCH FROM DATE ^(C.stringToSql d)))`) of |
| 159 | [res] => C.boolFromSql res |
| 160 | | row => Init.rowError ("dateGeNow", row) |
| 161 | |
| 162 | fun dateLeNow d = |
| 163 | case C.oneRow (getDb ()) ($`SELECT (EXTRACT(EPOCH FROM CURRENT_DATE) >= EXTRACT(EPOCH FROM DATE ^(C.stringToSql d)))`) of |
| 164 | [res] => C.boolFromSql res |
| 165 | | row => Init.rowError ("dateLeNow", row) |
| 166 | |
| 167 | fun dateLtNow d = |
| 168 | case C.oneRow (getDb ()) ($`SELECT (EXTRACT(EPOCH FROM CURRENT_DATE) > EXTRACT(EPOCH FROM DATE ^(C.stringToSql d)))`) of |
| 169 | [res] => C.boolFromSql res |
| 170 | | row => Init.rowError ("dateLtNow", row) |
| 171 | |
| 172 | fun canModify (poll : poll) = |
| 173 | Group.inGroupName "poll" |
| 174 | orelse (#usr poll = Init.getUserId() |
| 175 | andalso dateLtNow (#starts poll)) |
| 176 | |
| 177 | fun requireCanModify poll = |
| 178 | if canModify poll then |
| 179 | () |
| 180 | else |
| 181 | raise Init.Access "Not authorized to edit that poll" |
| 182 | |
| 183 | fun nextSeq pol = |
| 184 | case C.oneRow (getDb ()) ($`SELECT MAX(seq)+1 |
| 185 | FROM PollChoice |
| 186 | WHERE pol = ^(C.intToSql pol)`) of |
| 187 | [max] => if C.isNull max then 1.0 else C.realFromSql max |
| 188 | | row => Init.rowError ("nextSeq", row) |
| 189 | |
| 190 | fun takingVotes (poll : poll) = |
| 191 | dateLeNow (#starts poll) andalso dateGeNow (#ends poll) |
| 192 | |
| 193 | fun noDupes l = |
| 194 | case l of |
| 195 | [] => true |
| 196 | | h::t => List.all (fn x => x <> h) t andalso noDupes t |
| 197 | |
| 198 | fun listVoters cho = |
| 199 | C.map (getDb ()) mkUserRow ($`SELECT id, name, rname, bal, joined, app, shares |
| 200 | FROM WebUser, Vote |
| 201 | WHERE usr = id |
| 202 | AND cho = ^(C.intToSql cho) |
| 203 | ORDER BY name`) |
| 204 | |
| 205 | fun countVoters pol = |
| 206 | case C.oneRow (getDb ()) ($`SELECT COUNT(DISTINCT usr) |
| 207 | FROM Vote JOIN PollChoice ON id = cho AND pol = ^(C.intToSql pol)`) of |
| 208 | [count] => C.intFromSql count |
| 209 | | row => Init.rowError ("countVoters", row) |
| 210 | |
| 211 | fun listPollVoters pol = |
| 212 | C.map (getDb ()) mkUserRow ($`SELECT DISTINCT WebUser.id, name, rname, bal, joined, app, shares |
| 213 | FROM WebUser, Vote JOIN PollChoice ON cho = PollChoice.id |
| 214 | WHERE pol = ^(C.intToSql pol) |
| 215 | AND usr = WebUser.id |
| 216 | ORDER BY name`) |
| 217 | |
| 218 | end |