Mercurial > urweb
annotate tests/tryDml.ur @ 1469:a354b306f948
Explain how to signal an error in a commit handler
| author | Adam Chlipala <adam@chlipala.net> |
|---|---|
| date | Tue, 31 May 2011 09:14:03 -0400 |
| parents | 929981850d9d |
| children |
| rev | line source |
|---|---|
| adam@1293 | 1 table t : {Id : int} |
| adam@1293 | 2 PRIMARY KEY Id |
| adam@1293 | 3 |
| adam@1293 | 4 fun doStuff () = |
| adam@1293 | 5 dml (INSERT INTO t (Id) VALUES (0)); |
| adam@1293 | 6 o1 <- tryDml (INSERT INTO t (Id) VALUES (0)); |
| adam@1293 | 7 dml (INSERT INTO t (Id) VALUES (1)); |
| adam@1295 | 8 o2 <- tryDml (INSERT INTO t (Id) VALUES (2)); |
| adam@1295 | 9 dml (INSERT INTO t (Id) VALUES (3)); |
| adam@1295 | 10 o3 <- tryDml (INSERT INTO t (Id) VALUES (3)); |
| adam@1295 | 11 return <xml>{[o1]}; {[o2]}; {[o3]}</xml> |
| adam@1293 | 12 |
| adam@1293 | 13 fun main () = return <xml><body> |
| adam@1293 | 14 <form> <submit action={doStuff}/> </form> |
| adam@1293 | 15 </body></xml> |