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
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
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)} => $(map colMeta cols)
fun default [t] (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
val fl : folder cols
table tab : ([Id = int] ++ map fst cols)
val title : string
val cols : colsMeta cols
end) = struct
open constraints M
val tab = M.tab
sequence seq
fun list () =
rows <- queryX (SELECT * FROM tab AS T)
(fn (fs : {T : $([Id = int] ++ map fst M.cols)}) => <xml>
<tr>
<td>{[fs.T.Id]}</td>
{foldRX2 [fst] [colMeta] [tr]
(fn [nm :: Name] [t :: (Type * Type)] [rest :: {(Type * Type)}]
[[nm] ~ rest] v col => <xml>
<td>{col.Show v}</td>
</xml>)
[M.cols] M.fl (fs.T -- #Id) M.cols}
<td>
<a link={upd fs.T.Id}>[Update]</a>
<a link={confirm fs.T.Id}>[Delete]</a>
</td>
</tr>
</xml>);
return <xml>
<table border={1}>
<tr>
<th>ID</th>
{foldRX [colMeta] [tr]
(fn [nm :: Name] [t :: (Type * Type)] [rest :: {(Type * Type)}]
[[nm] ~ rest] col => <xml>
<th>{cdata col.Nam}</th>
</xml>)
[M.cols] M.fl M.cols}
</tr>
{rows}
</table>
<br/><hr/><br/>
<form>
{foldR [colMeta] [fn cols :: {(Type * Type)} => xml form [] (map snd cols)]
(fn [nm :: Name] [t :: (Type * Type)] [rest :: {(Type * Type)}]
[[nm] ~ rest] (col : colMeta t) (acc : xml form [] (map snd rest)) => <xml>
<li> {cdata col.Nam}: {col.Widget [nm]}</li>
{useMore acc}
</xml>)
<xml/>
[M.cols] M.fl M.cols}
<submit action={create}/>
</form>
</xml>
and create (inputs : $(map snd M.cols)) =
id <- nextval seq;
dml (insert tab
(foldR2 [snd] [colMeta]
[fn cols => $(map (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 ++ {nm = @sql_inject col.Inject (col.Parse input)})
{} [M.cols] M.fl inputs M.cols
++ {Id = (SQL {[id]})}));
ls <- list ();
return <xml><body>
<p>Inserted with ID {[id]}.</p>
{ls}
</body></xml>
and upd (id : int) =
let
fun save (inputs : $(map snd M.cols)) =
dml (update [map fst M.cols] !
(foldR2 [snd] [colMeta]
[fn cols => $(map (fn t :: (Type * Type) =>
sql_exp [T = [Id = int]
++ map fst M.cols]
[] [] t.1) cols)]
(fn [nm :: Name] [t :: (Type * Type)] [rest :: {(Type * Type)}]
[[nm] ~ rest] =>
fn input col acc => acc ++ {nm =
@sql_inject col.Inject (col.Parse input)})
{} [M.cols] M.fl inputs M.cols)
tab (WHERE T.Id = {[id]}));
ls <- list ();
return <xml><body>
<p>Saved!</p>
{ls}
</body></xml>
in
fso <- oneOrNoRows (SELECT tab.{{map fst M.cols}} FROM tab WHERE tab.Id = {[id]});
case fso : (Basis.option {Tab : $(map fst M.cols)}) of
None => return <xml><body>Not found!</body></xml>
| Some fs => return <xml><body><form>
{foldR2 [fst] [colMeta] [fn cols :: {(Type * Type)} => xml form [] (map snd cols)]
(fn [nm :: Name] [t :: (Type * Type)] [rest :: {(Type * Type)}]
[[nm] ~ rest] (v : t.1) (col : colMeta t)
(acc : xml form [] (map snd rest)) =>
<xml>
<li> {cdata col.Nam}: {col.WidgetPopulated [nm] v}</li>
{useMore acc}
</xml>)
<xml/>
[M.cols] M.fl fs.Tab M.cols}
<submit action={save}/>
</form></body></xml>
end
and confirm (id : int) =
let
fun delete () =
dml (DELETE FROM tab WHERE Id = {[id]});
ls <- list ();
return <xml><body>
<p>The deed is done.</p>
{ls}
</body></xml>
in
return <xml><body>
<p>Are you sure you want to delete ID #{[id]}?</p>
<form><submit action={delete} value="I was born sure!"/></form>
</body></xml>
end
and main () =
ls <- list ();
return <xml><head>
<title>{cdata M.title}</title>
</head><body>
<h1>{cdata M.title}</h1>
{ls}
</body></xml>
end
|
