cqlite 0.2.3

An embedded property graph database.
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

use cqlite::Graph;

#[test]
fn create_label_only() {
    let graph = Graph::open_anon().unwrap();
    let mut txn = graph.mut_txn().unwrap();
    let labels = graph
        .prepare("CREATE (n:TEST) RETURN LABEL(n)")
        .unwrap()
        .query_map(&mut txn, (), |m| m.get(0))
        .unwrap()
        .collect::<Result<Vec<String>, _>>()
        .unwrap();
    assert_eq!(labels, vec!["TEST"]);
    txn.commit().unwrap();

    let labels = graph
        .prepare("MATCH (n) RETURN LABEL(n)")
        .unwrap()
        .query_map(&mut graph.txn().unwrap(), (), |m| m.get(0))
        .unwrap()
        .collect::<Result<Vec<String>, _>>()
        .unwrap();
    assert_eq!(labels, vec!["TEST"]);
}

#[test]
fn create_with_properties() {
    let graph = Graph::open_anon().unwrap();
    let mut txn = graph.mut_txn().unwrap();
    let labels = graph
        .prepare("CREATE (n:TEST { foo: 42, bar: 'baz' }) RETURN n.foo, n.bar")
        .unwrap()
        .query_map(&mut txn, (), |m| Ok((m.get(0)?, m.get(1)?)))
        .unwrap()
        .collect::<Result<Vec<(i64, String)>, _>>()
        .unwrap();
    assert_eq!(labels, vec![(42, "baz".into())]);
    txn.commit().unwrap();

    let labels = graph
        .prepare("MATCH (n) RETURN n.foo, n.bar")
        .unwrap()
        .query_map(&mut graph.txn().unwrap(), (), |m| {
            Ok((m.get(0)?, m.get(1)?))
        })
        .unwrap()
        .collect::<Result<Vec<(i64, String)>, _>>()
        .unwrap();
    assert_eq!(labels, vec![(42, "baz".into())]);
}

#[test]
fn create_with_properties_from_parameters() {
    let graph = Graph::open_anon().unwrap();
    let mut txn = graph.mut_txn().unwrap();
    let labels = graph
        .prepare("CREATE (n:TEST { foo: $foo, bar: $bar }) RETURN n.foo, n.bar")
        .unwrap()
        .query_map(&mut txn, (("foo", 42), ("bar", "baz")), |m| {
            Ok((m.get(0)?, m.get(1)?))
        })
        .unwrap()
        .collect::<Result<Vec<(i64, String)>, _>>()
        .unwrap();
    assert_eq!(labels, vec![(42, "baz".into())]);
    txn.commit().unwrap();

    let labels = graph
        .prepare("MATCH (n) RETURN n.foo, n.bar")
        .unwrap()
        .query_map(&mut graph.txn().unwrap(), (), |m| {
            Ok((m.get(0)?, m.get(1)?))
        })
        .unwrap()
        .collect::<Result<Vec<(i64, String)>, _>>()
        .unwrap();
    assert_eq!(labels, vec![(42, "baz".into())]);
}

#[test]
fn create_edges_with_label() {
    let graph = Graph::open_anon().unwrap();

    let mut txn = graph.mut_txn().unwrap();
    graph
        .prepare("CREATE (a:NODE_A) CREATE (b:NODE_B) CREATE (a) -[:EDGE]-> (b)")
        .unwrap()
        .execute(&mut txn, ())
        .unwrap();
    txn.commit().unwrap();

    let labels = graph
        .prepare("MATCH (a) -[e]-> (b) RETURN LABEL(a), LABEL(b), LABEL(e)")
        .unwrap()
        .query_map(&mut graph.txn().unwrap(), (), |m| {
            Ok((m.get(0)?, m.get(1)?, m.get(2)?))
        })
        .unwrap()
        .collect::<Result<Vec<(String, String, String)>, _>>()
        .unwrap();
    assert_eq!(labels, [("NODE_A".into(), "NODE_B".into(), "EDGE".into())]);
}