rust-ef 1.8.0

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
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
184
185
186
187
188
189
190
191
192
193
194
195
196

//! LIMIT/OFFSET pagination dialect and combined end-to-end regression tests.
//!
//! Verifies that `QueryState::to_sql_with` delegates LIMIT/OFFSET generation
//! to `gen.pagination()` so each dialect emits its correct clause order:
//!   - SQLite/MySQL: `LIMIT x OFFSET y`
//!   - PostgreSQL: `OFFSET y LIMIT x`
//!   - MySQL offset-only: `LIMIT 18446744073709551615 OFFSET y`

mod common;

use common::{MySqlLikeGenerator, PgLikeGenerator, SqliteLikeGenerator};
use rust_ef::provider::DbValue;
use rust_ef::query::{AggKind, BoolExpr, CompareOp, FilterCondition, HavingExpr, QueryState};

// ---------------------------------------------------------------------------
// LIMIT / OFFSET pagination dialect tests
// ---------------------------------------------------------------------------

#[test]
fn test_pg_limit_offset_clause_order() {
    // PostgreSQL emits `OFFSET y LIMIT x` (not `LIMIT x OFFSET y`).
    let mut state = QueryState::new("blogs");
    state.offset = Some(10);
    state.limit = Some(5);

    let sql = state.to_sql_with(&PgLikeGenerator);
    assert!(
        sql.contains("OFFSET 10 LIMIT 5"),
        "PG pagination should be `OFFSET 10 LIMIT 5`, got: {sql}"
    );
    assert!(
        !sql.contains("LIMIT 5 OFFSET 10"),
        "PG must NOT use `LIMIT x OFFSET y` order, got: {sql}"
    );
}

#[test]
fn test_pg_offset_only() {
    // PG offset-only: `OFFSET y` with no LIMIT.
    let mut state = QueryState::new("blogs");
    state.offset = Some(20);

    let sql = state.to_sql_with(&PgLikeGenerator);
    assert!(
        sql.contains("OFFSET 20") && !sql.contains("LIMIT"),
        "PG offset-only should be `OFFSET 20` with no LIMIT, got: {sql}"
    );
}

#[test]
fn test_pg_limit_only() {
    let mut state = QueryState::new("blogs");
    state.limit = Some(5);

    let sql = state.to_sql_with(&PgLikeGenerator);
    assert!(
        sql.contains("LIMIT 5") && !sql.contains("OFFSET"),
        "PG limit-only should be `LIMIT 5`, got: {sql}"
    );
}

#[test]
fn test_sqlite_limit_offset_clause_order() {
    // SQLite emits `LIMIT x OFFSET y`.
    let mut state = QueryState::new("blogs");
    state.offset = Some(10);
    state.limit = Some(5);

    let sql = state.to_sql_with(&SqliteLikeGenerator);
    assert!(
        sql.contains("LIMIT 5 OFFSET 10"),
        "SQLite pagination should be `LIMIT 5 OFFSET 10`, got: {sql}"
    );
}

#[test]
fn test_sqlite_limit_only() {
    let mut state = QueryState::new("blogs");
    state.limit = Some(5);

    let sql = state.to_sql_with(&SqliteLikeGenerator);
    assert!(
        sql.contains("LIMIT 5"),
        "SQLite limit-only should be `LIMIT 5`, got: {sql}"
    );
}

#[test]
fn test_mysql_limit_offset_clause_order() {
    // MySQL emits `LIMIT x OFFSET y`.
    let mut state = QueryState::new("blogs");
    state.offset = Some(10);
    state.limit = Some(5);

    let sql = state.to_sql_with(&MySqlLikeGenerator);
    assert!(
        sql.contains("LIMIT 5 OFFSET 10"),
        "MySQL pagination should be `LIMIT 5 OFFSET 10`, got: {sql}"
    );
}

#[test]
fn test_mysql_offset_only_uses_large_limit() {
    // MySQL offset-only special case: `LIMIT 18446744073709551615 OFFSET y`.
    let mut state = QueryState::new("blogs");
    state.offset = Some(20);

    let sql = state.to_sql_with(&MySqlLikeGenerator);
    assert!(
        sql.contains("LIMIT 18446744073709551615 OFFSET 20"),
        "MySQL offset-only should use large LIMIT, got: {sql}"
    );
}

#[test]
fn test_no_pagination_emits_nothing() {
    let state = QueryState::new("blogs");
    // No limit, no offset → no pagination clause at all.
    let sql_pg = state.to_sql_with(&PgLikeGenerator);
    let sql_sqlite = state.to_sql_with(&SqliteLikeGenerator);
    let sql_mysql = state.to_sql_with(&MySqlLikeGenerator);
    assert!(
        !sql_pg.contains("LIMIT") && !sql_pg.contains("OFFSET"),
        "No pagination should emit nothing (PG), got: {sql_pg}"
    );
    assert!(
        !sql_sqlite.contains("LIMIT") && !sql_sqlite.contains("OFFSET"),
        "No pagination should emit nothing (SQLite), got: {sql_sqlite}"
    );
    assert!(
        !sql_mysql.contains("LIMIT") && !sql_mysql.contains("OFFSET"),
        "No pagination should emit nothing (MySQL), got: {sql_mysql}"
    );
}

// ---------------------------------------------------------------------------
// Combined WHERE + HAVING + LIMIT/OFFSET end-to-end SQL tests
// ---------------------------------------------------------------------------

#[test]
fn test_pg_full_query_where_having_pagination() {
    // Full query: WHERE category = $1 GROUP BY ... HAVING COUNT(id) > $2
    //             OFFSET 10 LIMIT 5
    let mut state = QueryState::new("blogs");
    state.parameters.push(DbValue::String("tech".to_string()));
    state.parameters.push(DbValue::I32(1));
    state.where_expr = Some(BoolExpr::Filter(FilterCondition::new("category", "=", 1)));
    state.group_bys = vec!["category".to_string()];
    state.havings.push(HavingExpr::Compare {
        agg: AggKind::Count,
        col: "id".to_string(),
        op: CompareOp::Gt,
        value: DbValue::I32(1),
    });
    state.offset = Some(10);
    state.limit = Some(5);

    let sql = state.to_sql_with(&PgLikeGenerator);
    assert!(sql.contains("WHERE category = $1"), "WHERE: {sql}");
    assert!(sql.contains("GROUP BY category"), "GROUP BY: {sql}");
    assert!(
        sql.contains("HAVING COUNT(id) > $2"),
        "HAVING should continue at $2: {sql}"
    );
    assert!(
        sql.contains("OFFSET 10 LIMIT 5"),
        "PG pagination should be OFFSET then LIMIT: {sql}"
    );
}

#[test]
fn test_mysql_full_query_where_having_pagination() {
    // MySQL: WHERE category = ? GROUP BY ... HAVING COUNT(id) > ?
    //        LIMIT 5 OFFSET 10
    let mut state = QueryState::new("blogs");
    state.parameters.push(DbValue::String("tech".to_string()));
    state.parameters.push(DbValue::I32(1));
    state.where_expr = Some(BoolExpr::Filter(FilterCondition::new("category", "=", 1)));
    state.group_bys = vec!["category".to_string()];
    state.havings.push(HavingExpr::Compare {
        agg: AggKind::Count,
        col: "id".to_string(),
        op: CompareOp::Gt,
        value: DbValue::I32(1),
    });
    state.offset = Some(10);
    state.limit = Some(5);

    let sql = state.to_sql_with(&MySqlLikeGenerator);
    assert!(sql.contains("WHERE category = ?"), "WHERE: {sql}");
    assert!(sql.contains("HAVING COUNT(id) > ?"), "HAVING: {sql}");
    assert!(
        sql.contains("LIMIT 5 OFFSET 10"),
        "MySQL pagination should be LIMIT then OFFSET: {sql}"
    );
}