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1 con colMeta = fn t_formT :: (Type * Type) => {
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2 Nam : string,
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3 Show : t_formT.1 -> xbody,
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4 Widget : nm :: Name -> xml form [] [nm = t_formT.2],
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5 Parse : t_formT.2 -> t_formT.1,
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6 Inject : sql_injectable t_formT.1
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7 }
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8 con colsMeta = fn cols :: {(Type * Type)} => $(Top.mapT2T colMeta cols)
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9
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10 functor Make(M : sig
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11 con cols :: {(Type * Type)}
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12 constraint [Id] ~ cols
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13 val tab : sql_table ([Id = int] ++ mapT2T fstTT cols)
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14
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15 val title : string
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16
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17 val cols : colsMeta cols
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18 end) = struct
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19
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20 open constraints M
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21 val tab = M.tab
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22
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23 sequence seq
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24
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25 fun create (inputs : $(mapT2T sndTT M.cols)) =
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26 id <- nextval seq;
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27 () <- dml (insert tab (foldT2R2 [sndTT] [colMeta]
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28 [fn cols => $(mapT2T (fn t :: (Type * Type) =>
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29 sql_exp [T = [Id = int] ++ mapT2T fstTT M.cols] [] [] t.1) cols)]
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30 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)}) =>
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31 [[nm] ~ rest] =>
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32 fn input col acc => acc with nm = sql_inject col.Inject (col.Parse input))
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33 {} [M.cols] inputs M.cols
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34 with #Id = (SQL {id})));
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35 return <html><body>
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36 Inserted with ID {txt _ id}.
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37 </body></html>
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38
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39 fun delete (id : int) =
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40 () <- dml (DELETE FROM tab WHERE Id = {id});
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41 return <html><body>
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42 The deed is done.
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43 </body></html>
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44
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45 fun confirm (id : int) = return <html><body>
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46 <p>Are you sure you want to delete ID #{txt _ id}?</p>
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47
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48 <p><a link={delete id}>I was born sure!</a></p>
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49 </body></html>
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50
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51 fun main () : transaction page =
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52 rows <- queryX (SELECT * FROM tab AS T)
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53 (fn (fs : {T : $([Id = int] ++ mapT2T fstTT M.cols)}) => <body>
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54 <tr>
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55 <td>{txt _ fs.T.Id}</td>
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56 {foldT2RX2 [fstTT] [colMeta] [tr]
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57 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)}) =>
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58 [[nm] ~ rest] =>
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59 fn v col => <tr>
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60 <td>{col.Show v}</td>
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61 </tr>)
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62 [M.cols] (fs.T -- #Id) M.cols}
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63 <td><a link={confirm fs.T.Id}>[Delete]</a></td>
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64 </tr>
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65 </body>);
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66 return <html><head>
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67 <title>{cdata M.title}</title>
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68
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69 </head><body>
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70
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71 <h1>{cdata M.title}</h1>
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72
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73 <table border={1}>
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74 <tr>
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75 <th>ID</th>
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76 {foldT2RX [colMeta] [tr]
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77 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)}) =>
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78 [[nm] ~ rest] =>
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79 fn col => <tr>
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80 <th>{cdata col.Nam}</th>
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81 </tr>)
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82 [M.cols] M.cols}
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83 </tr>
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84 {rows}
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85 </table>
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86
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87 <br/>
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88
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89 <lform>
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90 {foldT2R [colMeta] [fn cols :: {(Type * Type)} => xml form [] (mapT2T sndTT cols)]
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91 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)}) =>
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92 [[nm] ~ rest] =>
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93 fn (col : colMeta t) (acc : xml form [] (mapT2T sndTT rest)) => <lform>
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94 <li> {cdata col.Nam}: {col.Widget [nm]}</li>
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95 {useMore acc}
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96 </lform>)
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97 <lform></lform>
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98 [M.cols] M.cols}
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99
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100 <submit action={create}/>
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101 </lform>
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102 </body></html>
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103
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104 end
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