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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 WidgetPopulated : nm :: Name -> t_formT.1 -> xml form [] [nm = t_formT.2],
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6 Parse : t_formT.2 -> t_formT.1,
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7 Inject : sql_injectable t_formT.1
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8 }
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9 con colsMeta = fn cols :: {(Type * Type)} => $(Top.mapT2T colMeta cols)
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10
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11 functor Make(M : sig
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12 con cols :: {(Type * Type)}
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13 constraint [Id] ~ cols
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14 val tab : sql_table ([Id = int] ++ mapT2T fstTT cols)
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15
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16 val title : string
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17
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18 val cols : colsMeta cols
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19 end) = struct
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20
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21 open constraints M
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22 val tab = M.tab
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23
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24 sequence seq
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25
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26 fun create (inputs : $(mapT2T sndTT M.cols)) =
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27 id <- nextval seq;
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28 () <- dml (insert tab (foldT2R2 [sndTT] [colMeta]
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29 [fn cols => $(mapT2T (fn t :: (Type * Type) =>
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30 sql_exp [T = [Id = int] ++ mapT2T fstTT M.cols] [] [] t.1) cols)]
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31 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)}) =>
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32 [[nm] ~ rest] =>
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33 fn input col acc => acc with nm = sql_inject col.Inject (col.Parse input))
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34 {} [M.cols] inputs M.cols
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35 with #Id = (SQL {id})));
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36 return <html><body>
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37 Inserted with ID {txt _ id}.
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38 </body></html>
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39
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40 fun save (id : int) _ =
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41 return <html><body>
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42 Under Construction
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43 </body></html>
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44
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45 fun update (id : int) =
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46 fso <- oneOrNoRows (SELECT tab.{{mapT2T fstTT M.cols}} FROM tab WHERE tab.Id = {id});
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47 case fso : (Basis.option {Tab : $(mapT2T fstTT M.cols)}) of
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48 None => return <html><body>Not found!</body></html>
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49 | Some fs => return <html><body><lform>
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50 {foldT2R2 [fstTT] [colMeta] [fn cols :: {(Type * Type)} => xml form [] (mapT2T sndTT cols)]
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51 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)}) =>
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52 [[nm] ~ rest] =>
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53 fn (v : t.1) (col : colMeta t) (acc : xml form [] (mapT2T sndTT rest)) => <lform>
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54 <li> {cdata col.Nam}: {col.WidgetPopulated [nm] v}</li>
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55 {useMore acc}
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56 </lform>)
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57 <lform></lform>
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58 [M.cols] fs.Tab M.cols}
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59
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60 <submit action={save id}/>
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61 </lform></body></html>
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62
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63 fun delete (id : int) =
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64 () <- dml (DELETE FROM tab WHERE Id = {id});
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65 return <html><body>
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66 The deed is done.
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67 </body></html>
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68
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69 fun confirm (id : int) = return <html><body>
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70 <p>Are you sure you want to delete ID #{txt _ id}?</p>
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71
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72 <p><a link={delete id}>I was born sure!</a></p>
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73 </body></html>
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74
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75 fun main () : transaction page =
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76 rows <- queryX (SELECT * FROM tab AS T)
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77 (fn (fs : {T : $([Id = int] ++ mapT2T fstTT M.cols)}) => <body>
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78 <tr>
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79 <td>{txt _ fs.T.Id}</td>
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80 {foldT2RX2 [fstTT] [colMeta] [tr]
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81 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)}) =>
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82 [[nm] ~ rest] =>
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83 fn v col => <tr>
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84 <td>{col.Show v}</td>
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85 </tr>)
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86 [M.cols] (fs.T -- #Id) M.cols}
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87 <td><a link={update fs.T.Id}>[Update]</a> <a link={confirm fs.T.Id}>[Delete]</a></td>
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88 </tr>
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89 </body>);
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90 return <html><head>
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91 <title>{cdata M.title}</title>
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92
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93 </head><body>
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94
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95 <h1>{cdata M.title}</h1>
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96
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97 <table border={1}>
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98 <tr>
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99 <th>ID</th>
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100 {foldT2RX [colMeta] [tr]
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101 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)}) =>
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102 [[nm] ~ rest] =>
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103 fn col => <tr>
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104 <th>{cdata col.Nam}</th>
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105 </tr>)
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106 [M.cols] M.cols}
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107 </tr>
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108 {rows}
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109 </table>
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110
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111 <br/>
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112
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113 <lform>
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114 {foldT2R [colMeta] [fn cols :: {(Type * Type)} => xml form [] (mapT2T sndTT cols)]
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115 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)}) =>
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116 [[nm] ~ rest] =>
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117 fn (col : colMeta t) (acc : xml form [] (mapT2T sndTT rest)) => <lform>
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118 <li> {cdata col.Nam}: {col.Widget [nm]}</li>
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119 {useMore acc}
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120 </lform>)
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121 <lform></lform>
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122 [M.cols] M.cols}
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123
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124 <submit action={create}/>
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125 </lform>
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126 </body></html>
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127
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128 end
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