exemplar 0.37.0

A boilerplate eliminator for rusqlite.
Documentation 
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

use std::path::{Path, PathBuf};

use anyhow::Result;

use exemplar::Model;
use exemplar::{
    BindResult,
    ExtrResult
};

use rusqlite::types::ValueRef;

// Simple case
#[derive(Debug, PartialEq, Eq, Model)]
#[table("people")]
struct Person {
    name: String,
    age: u16,
    alive: bool, 
}

#[test]
fn test_person() -> Result<()> {
    use rusqlite::Connection;

    let mut conn = Connection::open_in_memory()
        .unwrap();

    conn.execute_batch("
        CREATE TABLE people (name, age, alive);
    ")?;

    let txn = conn.transaction()?;

    let alice = Person {
        name: "Alice".to_owned(),
        age: 21,
        alive: true
    };
    
    let bob = Person {
        name: "Bob".to_owned(),
        age: 90,
        alive: false
    };

    alice.insert(&txn)?;
    bob.insert(&txn)?;

    let mut stmt = txn.prepare("SELECT * FROM people ORDER BY name ASC")?;

    let mut iter = stmt.query_and_then([], Person::from_row)?;

    assert_eq!(alice, iter.next().unwrap()?);
    assert_eq!(bob, iter.next().unwrap()?);

    drop(iter);
    drop(stmt);
    txn.commit()?;

    Ok(())
}

#[test]
fn test_person_metadata() {
    let alice = Person {
        name: "Alice".to_owned(),
        age: 21,
        alive: true
    };

    let meta = alice.metadata_dyn(); 

    assert_eq!(meta.model, "Person");
    assert_eq!(meta.table, "people");
    assert_eq!(meta.fields, &["name", "age", "alive"]);
    assert_eq!(meta.columns, &["name", "age", "alive"]);
}

// Complicated case
#[derive(Debug, PartialEq, Eq, Model)]
#[table("users")]
#[check("schema.sql")]
struct User {
    username: String,
    #[bind(bind_path)]
    #[extr(extr_path)]
    home_dir: PathBuf,
    #[column("pwd")]
    password: Vec<u8>,
}

pub fn bind_path(value: &Path) -> BindResult {
    use rusqlite::types::Value;
    use rusqlite::types::ToSqlOutput;

    let str = value.to_string_lossy().into_owned();

    Ok(ToSqlOutput::Owned(
        Value::Text(str)
    ))
}

pub fn extr_path(value: &ValueRef) -> ExtrResult<PathBuf> {
    let path = value.as_str()?;
    let path = PathBuf::from(path);

    Ok(path)
}

#[test]
fn test_user() -> Result<()> {
    use rusqlite::Connection;

    let conn = Connection::open_in_memory()
        .unwrap();

    conn.execute_batch(
        include_str!("schema.sql")
    )?;

    let alice = User {
        username: "Alice".to_owned(),
        home_dir: "/var/home/alice".into(),
        password: b"hunter2".as_slice().into(),
    };
    
    let bob = User {
        username: "Bob".to_owned(),
        home_dir: "/var/home/robert".into(),
        password: b"password".as_slice().into(),
    };

    alice.insert(&conn)?;
    bob.insert(&conn)?;

    let mut stmt = conn.prepare("SELECT * FROM users ORDER BY username ASC")?;

    let mut iter = stmt.query_and_then([], User::from_row)?;

    assert_eq!(alice, iter.next().unwrap()?);
    assert_eq!(bob, iter.next().unwrap()?);

    Ok(())
}

#[test]
fn test_user_metadata() {
    let alice = User {
        username: "Alice".to_owned(),
        home_dir: "/var/home/alice".into(),
        password: b"hunter2".as_slice().into(),
    };

    let meta = alice.metadata_dyn(); 

    assert_eq!(meta.model, "User");
    assert_eq!(meta.table, "users");
    assert_eq!(meta.fields, &["username", "home_dir", "password"]);
    assert_eq!(meta.columns, &["username", "home_dir", "pwd"]);
}