macrodb 0.1.1

Macro-generated in-memory relational database for Rust
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

use macrodb::table;
use std::collections::{BTreeMap as Map, BTreeSet as Set};

type UserId = u64;

#[derive(Clone, Debug, PartialEq, Eq)]
struct User {
    id: UserId,
    first: String,
    last: String,
    age: u16,
    city: String,
    country: String,
}

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
enum Error {
    UserIdExists,
    UserNotFound,
    UserNameExists,
}

#[derive(Clone, Debug, Default)]
struct Database {
    users: Map<UserId, User>,
    user_by_name: Map<(String, String), UserId>,
    users_by_age: Map<u16, Set<UserId>>,
    users_by_location: Map<(String, String), Set<UserId>>,
}

impl Database {
    table!(
        users: User,
        id: UserId,
        missing Error => Error::UserNotFound,
        primary users id => Error::UserIdExists,
        index users_by_location (city, country) => (),
        unique user_by_name (first, last) => Error::UserNameExists,
        index users_by_age age => ()
    );
}

#[test]
fn can_insert_user() {
    let mut database = Database::default();
    let user = User {
        id: database.users_next_id(),
        first: "John".into(),
        last: "Doe".into(),
        age: 21,
        city: "Atlantic City".into(),
        country: "United States".into(),
    };
    database.users_insert(user.clone()).unwrap();
    assert_eq!(database.users.get(&user.id), Some(&user));
    assert!(database
        .users_by_age
        .get(&user.age)
        .unwrap()
        .contains(&user.id));
    assert!(database
        .users_by_location
        .get(&(user.city.clone(), user.country.clone()))
        .unwrap()
        .contains(&user.id));
    assert_eq!(
        database
            .user_by_name
            .get(&(user.first.clone(), user.last.clone())),
        Some(&user.id)
    );
}

#[test]
fn cannot_insert_user_existing_name() {
    let mut database = Database::default();
    database
        .users_insert(User {
            id: database.users_next_id(),
            first: "John".into(),
            last: "Doe".into(),
            age: 21,
            city: "Atlantic City".into(),
            country: "United States".into(),
        })
        .unwrap();
    let result = database.users_insert(User {
        id: database.users_next_id(),
        first: "John".into(),
        last: "Doe".into(),
        age: 24,
        city: "Elsewhere".into(),
        country: "United States".into(),
    });
    assert_eq!(result, Err(Error::UserNameExists));
}

#[test]
fn can_update_user() {
    let mut database = Database::default();
    let id = database.users_next_id();
    let mut user = User {
        id,
        first: "John".into(),
        last: "Doe".into(),
        age: 21,
        city: "Atlantic City".into(),
        country: "United States".into(),
    };
    database.users_insert(user.clone()).unwrap();
    user.first = "Jack".into();
    user.last = "Campbell".into();
    user.city = "Neverland".into();
    user.country = "Mexico".into();
    database.users_update(user.clone()).unwrap();
    assert_eq!(database.users.get(&id), Some(&user));
    assert!(database.users_by_age.get(&user.age).unwrap().contains(&id));
    assert!(database
        .users_by_location
        .get(&(user.city.clone(), user.country.clone()))
        .unwrap()
        .contains(&id));
    assert_eq!(
        database
            .user_by_name
            .get(&(user.first.clone(), user.last.clone())),
        Some(&id)
    );
}

#[test]
fn can_delete_user() {
    let mut database = Database::default();
    let user = User {
        id: database.users_next_id(),
        first: "John".into(),
        last: "Doe".into(),
        age: 21,
        city: "Atlantic City".into(),
        country: "United States".into(),
    };
    database.users_insert(user.clone()).unwrap();
    database.users_delete(user.id).unwrap();
    assert_eq!(database.users.get(&user.id), None);
    assert!(database.users_by_age.get(&user.age).is_none());
    assert!(database
        .users_by_location
        .get(&(user.city.clone(), user.country.clone()))
        .is_none());
    assert_eq!(
        database
            .user_by_name
            .get(&(user.first.clone(), user.last.clone())),
        None
    );
}