1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
con colMeta = fn t_formT :: (Type * Type) => {
Nam : string,
Show : t_formT.1 -> xbody,
Widget : nm :: Name -> xml form [] [nm = t_formT.2],
WidgetPopulated : nm :: Name -> t_formT.1 -> xml form [] [nm = t_formT.2],
Parse : t_formT.2 -> t_formT.1,
Inject : sql_injectable t_formT.1
}
con colsMeta = fn cols :: {(Type * Type)} => $(Top.mapT2T colMeta cols)
fun default (t ::: Type) (sh : show t) (rd : read t) (inj : sql_injectable t)
name : colMeta (t, string) =
{Nam = name,
Show = txt,
Widget = fn nm :: Name => <xml><textbox{nm}/></xml>,
WidgetPopulated = fn (nm :: Name) n =>
<xml><textbox{nm} value={show n}/></xml>,
Parse = readError,
Inject = _}
val int = default
val float = default
val string = default
fun bool name = {Nam = name,
Show = txt,
Widget = fn nm :: Name => <xml><checkbox{nm}/></xml>,
WidgetPopulated = fn (nm :: Name) b =>
<xml><checkbox{nm} checked={b}/></xml>,
Parse = fn x => x,
Inject = _}
functor Make(M : sig
con cols :: {(Type * Type)}
constraint [Id] ~ cols
table tab : ([Id = int] ++ mapT2T fstTT cols)
val title : string
val cols : colsMeta cols
end) = struct
open constraints M
val tab = M.tab
sequence seq
fun create (inputs : $(mapT2T sndTT M.cols)) =
id <- nextval seq;
() <- dml (insert tab
(foldT2R2 [sndTT] [colMeta]
[fn cols => $(mapT2T (fn t :: (Type * Type) =>
sql_exp [] [] [] t.1) cols)]
(fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
[[nm] ~ rest] =>
fn input col acc => acc with nm = @sql_inject col.Inject (col.Parse input))
{} [M.cols] inputs M.cols
with #Id = (SQL {id})));
return <xml><body>
Inserted with ID {[id]}.
</body></xml>
fun save (id : int) (inputs : $(mapT2T sndTT M.cols)) =
() <- dml (update [mapT2T fstTT M.cols]
(foldT2R2 [sndTT] [colMeta]
[fn cols => $(mapT2T (fn t :: (Type * Type) =>
sql_exp [T = [Id = int]
++ mapT2T fstTT M.cols]
[] [] t.1) cols)]
(fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
[[nm] ~ rest] =>
fn input col acc => acc with nm =
@sql_inject col.Inject (col.Parse input))
{} [M.cols] inputs M.cols)
tab (WHERE T.Id = {id}));
return <xml><body>
Saved!
</body></xml>
fun update (id : int) =
fso <- oneOrNoRows (SELECT tab.{{mapT2T fstTT M.cols}} FROM tab WHERE tab.Id = {id});
case fso : (Basis.option {Tab : $(mapT2T fstTT M.cols)}) of
None => return <xml><body>Not found!</body></xml>
| Some fs => return <xml><body><form>
{foldT2R2 [fstTT] [colMeta] [fn cols :: {(Type * Type)} => xml form [] (mapT2T sndTT cols)]
(fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
[[nm] ~ rest] (v : t.1) (col : colMeta t)
(acc : xml form [] (mapT2T sndTT rest)) =>
<xml>
<li> {cdata col.Nam}: {col.WidgetPopulated [nm] v}</li>
{useMore acc}
</xml>)
<xml/>
[M.cols] fs.Tab M.cols}
<submit action={save id}/>
</form></body></xml>
fun delete (id : int) =
() <- dml (DELETE FROM tab WHERE Id = {id});
return <xml><body>
The deed is done.
</body></xml>
fun confirm (id : int) = return <xml><body>
<p>Are you sure you want to delete ID #{[id]}?</p>
<p><a link={delete id}>I was born sure!</a></p>
</body></xml>
fun main () =
rows <- queryX (SELECT * FROM tab AS T)
(fn (fs : {T : $([Id = int] ++ mapT2T fstTT M.cols)}) => <xml>
<tr>
<td>{[fs.T.Id]}</td>
{foldT2RX2 [fstTT] [colMeta] [tr]
(fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
[[nm] ~ rest] v col => <xml>
<td>{col.Show v}</td>
</xml>)
[M.cols] (fs.T -- #Id) M.cols}
<td>
<a link={update fs.T.Id}>[Update]</a>
<a link={confirm fs.T.Id}>[Delete]</a>
</td>
</tr>
</xml>);
return <xml><head>
<title>{cdata M.title}</title>
</head><body>
<h1>{cdata M.title}</h1>
<table border={1}>
<tr>
<th>ID</th>
{foldT2RX [colMeta] [tr]
(fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
[[nm] ~ rest] col => <xml>
<th>{cdata col.Nam}</th>
</xml>)
[M.cols] M.cols}
</tr>
{rows}
</table>
<br/>
<form>
{foldT2R [colMeta] [fn cols :: {(Type * Type)} => xml form [] (mapT2T sndTT cols)]
(fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
[[nm] ~ rest] (col : colMeta t) (acc : xml form [] (mapT2T sndTT rest)) => <xml>
<li> {cdata col.Nam}: {col.Widget [nm]}</li>
{useMore acc}
</xml>)
<xml/>
[M.cols] M.cols}
<submit action={create}/>
</form>
</body></xml>
end
|
