annotate demo/constraints.ur @ 2307:6ae9a2784a45

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author Adam Chlipala <adam@chlipala.net>
date Sun, 20 Dec 2015 14:39:50 -0500
parents 74a090ff296e
children
rev   line source
adamc@773 1 table t : { Id : int, Nam : string, Parent : option int }
adamc@773 2 PRIMARY KEY Id,
adamc@773 3 CONSTRAINT Nam UNIQUE Nam,
adamc@773 4 CONSTRAINT Id CHECK Id >= 0,
adamc@773 5 CONSTRAINT Parent FOREIGN KEY Parent REFERENCES t(Id)
adamc@773 6
adamc@773 7 fun main () =
adamc@773 8 list <- queryX (SELECT * FROM t)
adamc@773 9 (fn r => <xml><tr>
adamc@773 10 <td>{[r.T.Id]}</td>
adamc@773 11 <td>{[r.T.Nam]}</td>
adamc@773 12 <td>{case r.T.Parent of
adamc@773 13 None => <xml>NULL</xml>
adamc@773 14 | Some id => <xml>{[id]}</xml>}</td>
adamc@773 15 </tr></xml>);
adamc@773 16 return <xml><body>
adamc@773 17 <table>
adamc@773 18 <tr> <th>Id</th> <th>Name</th> <th>Parent</th> </tr>
adamc@773 19 {list}
adamc@773 20 </table>
adamc@773 21
adamc@773 22 <form>
adamc@773 23 <table>
adamc@773 24 <tr> <th>Id:</th> <td><textbox{#Id}/></td> </tr>
adamc@773 25 <tr> <th>Name:</th> <td><textbox{#Nam}/></td> </tr>
adamc@773 26 <tr> <th>Parent:</th> <td><textbox{#Parent}/></td> </tr>
adamc@773 27 <tr> <th/> <td><submit action={add}/></td> </tr>
adamc@773 28 </table>
adamc@773 29 </form>
adamc@773 30 </body></xml>
adamc@773 31
adamc@773 32 and add r =
adamc@773 33 dml (INSERT INTO t (Id, Nam, Parent)
adamc@773 34 VALUES ({[readError r.Id]}, {[r.Nam]},
adamc@773 35 {[case r.Parent of
adamc@773 36 "" => None
adamc@773 37 | s => Some (readError s)]}));
adamc@773 38 main ()