annotate demo/batch.ur @ 825:7f871c03e3a1
Destructing local let, to the point where demo compiles
| author |
Adam Chlipala <adamc@hcoop.net> |
| date |
Thu, 28 May 2009 12:07:05 -0400 |
| parents |
a44daa674810 |
| children |
ed06e25c70ef |
| rev |
line source |
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1 datatype list t = Nil | Cons of t * list t
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2
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3 table t : {Id : int, A : string}
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4 PRIMARY KEY Id
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5
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6 fun allRows () =
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7 query (SELECT * FROM t)
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8 (fn r acc => return (Cons ((r.T.Id, r.T.A), acc)))
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9 Nil
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10
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11 fun doBatch ls =
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12 case ls of
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13 Nil => return ()
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14 | Cons ((id, a), ls') =>
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15 dml (INSERT INTO t (Id, A) VALUES ({[id]}, {[a]}));
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16 doBatch ls'
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17
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18 fun del id =
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19 dml (DELETE FROM t WHERE t.Id = {[id]})
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20
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21 fun show withDel lss =
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22 let
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23 fun show' ls =
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24 case ls of
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25 Nil => <xml/>
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26 | Cons ((id, a), ls) => <xml>
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27 <tr><td>{[id]}</td> <td>{[a]}</td> {if withDel then
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28 <xml><td><button value="Delete" onclick={del id}/></td></xml>
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29 else
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30 <xml/>} </tr>
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31 {show' ls}
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32 </xml>
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33 in
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34 <xml><dyn signal={ls <- signal lss; return <xml><table>
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35 <tr> <th>Id</th> <th>A</th> </tr>
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36 {show' ls}
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37 </table></xml>}/></xml>
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38 end
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39
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40 fun main () =
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41 lss <- source Nil;
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42 batched <- source Nil;
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43
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44 id <- source "";
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45 a <- source "";
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46
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47 let
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48 fun add () =
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49 id <- get id;
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50 a <- get a;
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51 ls <- get batched;
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52
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53 set batched (Cons ((readError id, a), ls))
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54
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55 fun exec () =
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56 ls <- get batched;
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57
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58 doBatch ls;
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59 set batched Nil
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60 in
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61 return <xml><body>
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62 <h2>Rows</h2>
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63
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64 {show True lss}
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65
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66 <button value="Update" onclick={ls <- allRows (); set lss ls}/><br/>
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67 <br/>
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68
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69 <h2>Batch new rows to add</h2>
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70
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71 <table>
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72 <tr> <th>Id:</th> <td><ctextbox source={id}/></td> </tr>
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73 <tr> <th>A:</th> <td><ctextbox source={a}/></td> </tr>
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74 <tr> <th/> <td><button value="Batch it" onclick={add ()}/></td> </tr>
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75 </table>
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76
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77 <h2>Already batched:</h2>
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78 {show False batched}
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79 <button value="Execute" onclick={exec ()}/>
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80 </body></xml>
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81 end
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