rust-ef 1.7.0

Rust Entity Framework - An EFCore-inspired ORM 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

//! Mock SQL generators mimicking each provider's dialect behavior for
//! HAVING placeholder and LIMIT/OFFSET pagination dialect tests.

use rust_ef::provider::ISqlGenerator;

/// Mimics PostgreSQL: `$N` placeholders, `OFFSET x LIMIT y` pagination order.
pub struct PgLikeGenerator;

impl ISqlGenerator for PgLikeGenerator {
    fn select(&self, _: &str, _: &[&str]) -> String {
        String::new()
    }
    fn insert(&self, _: &str, _: &[&str], _: bool) -> String {
        String::new()
    }
    fn update(&self, _: &str, _: &[&str], _: &str) -> String {
        String::new()
    }
    fn delete(&self, _: &str, _: &str) -> String {
        String::new()
    }
    fn create_table(&self, _: &str, _: &[(String, String)]) -> String {
        String::new()
    }
    fn drop_table(&self, _: &str) -> String {
        String::new()
    }
    fn pagination(&self, skip: Option<usize>, take: Option<usize>) -> String {
        match (skip, take) {
            (Some(s), Some(t)) => format!("OFFSET {} LIMIT {}", s, t),
            (Some(s), None) => format!("OFFSET {}", s),
            (None, Some(t)) => format!("LIMIT {}", t),
            (None, None) => String::new(),
        }
    }
    fn parameter_placeholder(&self, index: usize) -> String {
        format!("${}", index)
    }
    fn quote_identifier(&self, identifier: &str) -> String {
        format!("\"{}\"", identifier)
    }
    fn auto_increment_syntax(&self) -> &'static str {
        "SERIAL"
    }
}

/// Mimics MySQL: `?` placeholders, `LIMIT x OFFSET y` order, special
/// offset-only case using `LIMIT 18446744073709551615 OFFSET y`.
pub struct MySqlLikeGenerator;

impl ISqlGenerator for MySqlLikeGenerator {
    fn select(&self, _: &str, _: &[&str]) -> String {
        String::new()
    }
    fn insert(&self, _: &str, _: &[&str], _: bool) -> String {
        String::new()
    }
    fn update(&self, _: &str, _: &[&str], _: &str) -> String {
        String::new()
    }
    fn delete(&self, _: &str, _: &str) -> String {
        String::new()
    }
    fn create_table(&self, _: &str, _: &[(String, String)]) -> String {
        String::new()
    }
    fn drop_table(&self, _: &str) -> String {
        String::new()
    }
    fn pagination(&self, skip: Option<usize>, take: Option<usize>) -> String {
        match (skip, take) {
            (Some(s), Some(t)) => format!("LIMIT {} OFFSET {}", t, s),
            (None, Some(t)) => format!("LIMIT {}", t),
            (Some(s), None) => format!("LIMIT 18446744073709551615 OFFSET {}", s),
            (None, None) => String::new(),
        }
    }
    fn parameter_placeholder(&self, _: usize) -> String {
        "?".to_string()
    }
    fn quote_identifier(&self, identifier: &str) -> String {
        format!("`{}`", identifier)
    }
    fn auto_increment_syntax(&self) -> &'static str {
        "AUTO_INCREMENT"
    }
}

/// Mimics SQLite: `?` placeholders, `LIMIT x OFFSET y` order, no offset-only.
pub struct SqliteLikeGenerator;

impl ISqlGenerator for SqliteLikeGenerator {
    fn select(&self, _: &str, _: &[&str]) -> String {
        String::new()
    }
    fn insert(&self, _: &str, _: &[&str], _: bool) -> String {
        String::new()
    }
    fn update(&self, _: &str, _: &[&str], _: &str) -> String {
        String::new()
    }
    fn delete(&self, _: &str, _: &str) -> String {
        String::new()
    }
    fn create_table(&self, _: &str, _: &[(String, String)]) -> String {
        String::new()
    }
    fn drop_table(&self, _: &str) -> String {
        String::new()
    }
    fn pagination(&self, skip: Option<usize>, take: Option<usize>) -> String {
        match (skip, take) {
            (Some(s), Some(t)) => format!("LIMIT {} OFFSET {}", t, s),
            (None, Some(t)) => format!("LIMIT {}", t),
            _ => String::new(),
        }
    }
    fn parameter_placeholder(&self, _: usize) -> String {
        "?".to_string()
    }
    fn quote_identifier(&self, identifier: &str) -> String {
        format!("\"{}\"", identifier)
    }
    fn auto_increment_syntax(&self) -> &'static str {
        "AUTOINCREMENT"
    }
}