annotate demo/batch.ur @ 682:5bbb542243e8
Redo channels, making them single-client
| author |
Adam Chlipala <adamc@hcoop.net> |
| date |
Sun, 29 Mar 2009 11:37:29 -0400 |
| parents |
96ebc6bdb5a0 |
| children |
1a317a707d71 |
| 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
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5 fun allRows () =
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6 query (SELECT * FROM t)
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7 (fn r acc => return (Cons ((r.T.Id, r.T.A), acc)))
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8 Nil
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9
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10 fun doBatch ls =
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11 case ls of
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12 Nil => return ()
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13 | Cons ((id, a), ls') =>
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14 dml (INSERT INTO t (Id, A) VALUES ({[id]}, {[a]}));
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15 doBatch ls'
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16
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17 fun del id =
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18 dml (DELETE FROM t WHERE t.Id = {[id]})
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19
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20 fun show withDel lss =
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21 let
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22 fun show' ls =
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23 case ls of
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24 Nil => <xml/>
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25 | Cons ((id, a), ls) => <xml>
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26 <tr><td>{[id]}</td> <td>{[a]}</td> {if withDel then
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27 <xml><td><button value="Delete" onclick={del id}/></td></xml>
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28 else
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29 <xml/>} </tr>
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30 {show' ls}
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31 </xml>
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32 in
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33 <xml><dyn signal={ls <- signal lss; return <xml><table>
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34 <tr> <th>Id</th> <th>A</th> </tr>
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35 {show' ls}
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36 </table></xml>}/></xml>
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37 end
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38
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39 fun main () =
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40 lss <- source Nil;
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41 batched <- source Nil;
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42
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43 id <- source "";
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44 a <- source "";
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45
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46 let
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47 fun add () =
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48 id <- get id;
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49 a <- get a;
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50 ls <- get batched;
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51
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52 set batched (Cons ((readError id, a), ls))
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53
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54 fun exec () =
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55 ls <- get batched;
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56
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57 doBatch ls;
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58 set batched Nil
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59 in
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60 return <xml><body>
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61 <h2>Rows</h2>
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62
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63 {show True lss}
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64
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65 <button value="Update" onclick={ls <- allRows (); set lss ls}/><br/>
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66 <br/>
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67
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68 <h2>Batch new rows to add</h2>
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69
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70 <table>
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71 <tr> <th>Id:</th> <td><ctextbox source={id}/></td> </tr>
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72 <tr> <th>A:</th> <td><ctextbox source={a}/></td> </tr>
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73 <tr> <th/> <td><button value="Batch it" onclick={add ()}/></td> </tr>
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74 </table>
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75
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76 <h2>Already batched:</h2>
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77 {show False batched}
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78 <button value="Execute" onclick={exec ()}/>
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79 </body></xml>
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80 end
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