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annotate demo/refFun.ur @ 2057:f4a6ccb7937f
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| author | Sergey Mironov <grrwlf@gmail.com> |
|---|---|
| date | Sun, 17 Aug 2014 18:28:37 +0000 |
| parents | 1a317a707d71 |
| children |
| rev | line source |
|---|---|
| adamc@419 | 1 functor Make(M : sig |
| adamc@419 | 2 type data |
| adamc@419 | 3 val inj : sql_injectable data |
| adamc@419 | 4 end) = struct |
| adamc@419 | 5 |
| adamc@419 | 6 type ref = int |
| adamc@419 | 7 |
| adamc@419 | 8 sequence s |
| adamc@419 | 9 table t : { Id : int, Data : M.data } |
| adamc@708 | 10 PRIMARY KEY Id |
| adamc@419 | 11 |
| adamc@419 | 12 fun new d = |
| adamc@419 | 13 id <- nextval s; |
| adamc@471 | 14 dml (INSERT INTO t (Id, Data) VALUES ({[id]}, {[d]})); |
| adamc@419 | 15 return id |
| adamc@419 | 16 |
| adamc@419 | 17 fun read r = |
| adamc@471 | 18 o <- oneOrNoRows (SELECT t.Data FROM t WHERE t.Id = {[r]}); |
| adamc@501 | 19 case o of |
| adamc@419 | 20 None => error <xml>You already deleted that ref!</xml> |
| adamc@501 | 21 | Some r => return r.T.Data |
| adamc@419 | 22 |
| adamc@419 | 23 fun write r d = |
| adamc@471 | 24 dml (UPDATE t SET Data = {[d]} WHERE Id = {[r]}) |
| adamc@419 | 25 |
| adamc@419 | 26 fun delete r = |
| adamc@471 | 27 dml (DELETE FROM t WHERE Id = {[r]}) |
| adamc@420 | 28 |
| adamc@419 | 29 end |