-
Notifications
You must be signed in to change notification settings - Fork 0
/
database.gleam
183 lines (168 loc) · 3.63 KB
/
database.gleam
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
//// This is the main entry point for interacting with pgo dbs.
//// It does things like selecting all rows, single records, inserting, updating, and deleting.
import gleam/pgo.{Connection}
import gleam/list
import gleam/io
import database/query.{Query}
import database/schema.{Schema}
/// Select all rows from a table.
///
/// ## Examples
///
/// ```gleam
/// schema
/// |> from()
/// |> select(["id", "name"])
/// |> database.all(db)
///
/// schema
/// |> from()
/// |> select(["*"])
/// |> database.all(db)
/// ```
pub fn all(q: Query(a), db: Connection) -> Result(List(a), Nil) {
let sql = query.build(q)
case pgo.execute(sql, db, q.bindings, q.from.decoder) {
Ok(result) -> Ok(result.rows)
Error(e) -> {
io.debug(e)
Error(Nil)
}
}
}
/// Select a single record from a table. If there's more
/// than one row returned this will only return the first.
///
/// ## Examples
///
/// ```gleam
/// schema()
/// |> from()
/// |> select(["*"])
/// |> where([#("id = $1", [pgo.int(id)])])
/// |> database.one(db)
///
/// schema()
/// |> from()
/// |> select(["id"])
/// |> where([#("title ilike '%$1%'", [pgo.text(title)])])
/// |> database.one(db)
/// ```
pub fn one(q: Query(a), db: Connection) -> Result(a, Nil) {
let sql = query.build(q)
case pgo.execute(sql, db, q.bindings, q.from.decoder) {
Ok(result) -> {
result.rows
|> list.first()
}
Error(e) -> {
io.debug(e)
Error(Nil)
}
}
}
/// Insert a record into a table.
///
/// ## Examples
///
/// ```gleam
/// database.insert(
/// schema(),
/// [pgo.text(note.title), pgo.text(note.content)],
/// db,
/// )
/// ```
pub fn insert(
schema: Schema(a),
data: List(pgo.Value),
db: Connection,
) -> Result(a, Nil) {
let sql = query.insert(schema)
case pgo.execute(sql, db, data, schema.decoder) {
Ok(result) -> {
case list.first(result.rows) {
Ok(result) -> Ok(result)
Error(_e) -> Error(Nil)
}
}
Error(e) -> {
io.debug(e)
Error(Nil)
}
}
}
/// Update one or more records in a table. Right now
/// it will only return the first updated record but
/// could be updated to return more than one.
///
/// ## Examples
///
/// ```gleam
/// schema()
/// |> from()
/// |> where([#("id = $1", [pgo.int(id)])])
/// |> database.update(
/// [
/// #("title", pgo.text(note.title)),
/// #("content", pgo.text(note.content)),
/// ],
/// db,
/// )
/// ```
pub fn update(
query: Query(a),
data: List(#(String, pgo.Value)),
db: Connection,
) -> Result(a, Nil) {
let sql = query.update(query, data)
let bindings =
list.append(
query.bindings,
list.map(
data,
fn(field) {
let #(_field, value) = field
value
},
),
)
case pgo.execute(sql, db, bindings, query.from.decoder) {
Ok(result) -> {
case list.first(result.rows) {
Ok(result) -> Ok(result)
Error(_e) -> Error(Nil)
}
}
Error(e) -> {
io.debug(e)
Error(Nil)
}
}
}
/// Delete a record from a table. Right now it will only
/// return the first deleted record but could be updated
/// to return more than one.
///
/// ## Examples
///
/// ```gleam
/// schema()
/// |> from()
/// |> where([#("id = $1", [pgo.int(id)])])
/// |> database.delete(db)
/// ```
pub fn delete(query: Query(a), db: Connection) -> Result(a, Nil) {
let sql = query.delete(query)
case pgo.execute(sql, db, query.bindings, query.from.decoder) {
Ok(result) -> {
case list.first(result.rows) {
Ok(result) -> Ok(result)
Error(_e) -> Error(Nil)
}
}
Error(e) -> {
io.debug(e)
Error(Nil)
}
}
}