magnumdb 0.4.8

High-performance embeddable database engine in Rust with B+ Tree storage, WAL durability, Volcano query engine, and Postgres wire protocol support.
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
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386

use magnumdb::config::Config;
use magnumdb::sql::{Executor, Parser};
use magnumdb::storage::Database;
use tempfile::tempdir;

fn setup_executor(dir: &tempfile::TempDir) -> (Database, Config) {
    let mut config = Config::default();
    config.storage.path = dir.path().to_path_buf();
    config.wal.enabled = false;
    config.storage.sync_interval = 0;
    let db = Database::open(config.clone()).unwrap();
    (db, config)
}

#[test]
fn test_create_table_and_insert() {
    let dir = tempdir().unwrap();
    let (mut db, _) = setup_executor(&dir);
    let mut exec = Executor::new(&mut db);

    // 1. Create table
    let stmt = Parser::parse("CREATE TABLE users(id INT, name TEXT NOT NULL)").unwrap();
    assert!(exec.execute(stmt).is_ok());

    // 2. Insert into non-existent table fails
    let stmt = Parser::parse("INSERT INTO fake VALUES(1, 'John')").unwrap();
    assert!(exec.execute(stmt).is_err());

    // 3. Insert valid row
    let stmt = Parser::parse("INSERT INTO users VALUES(1, 'John')").unwrap();
    assert!(exec.execute(stmt).is_ok());

    // 4. Insert wrong column count fails
    let stmt = Parser::parse("INSERT INTO users VALUES(2)").unwrap();
    assert!(exec.execute(stmt).is_err());

    // 5. Select round-trips correctly
    let stmt = Parser::parse("SELECT * FROM users").unwrap();
    let res = exec.execute(stmt).unwrap();
    assert!(res.contains("id | name"));
    assert!(res.contains("1 | John"));
}

#[test]
fn test_transactions() {
    let dir = tempdir().unwrap();
    let (mut db, _) = setup_executor(&dir);
    let mut exec = Executor::new(&mut db);

    let stmt = Parser::parse("CREATE TABLE users(id INT, name TEXT)").unwrap();
    exec.execute(stmt).unwrap();

    // 1. Rollback test
    exec.execute(Parser::parse("BEGIN").unwrap()).unwrap();
    exec.execute(Parser::parse("INSERT INTO users VALUES(1, 'Alice')").unwrap())
        .unwrap();

    // Verify it exists in current transaction context
    let res = exec
        .execute(Parser::parse("SELECT * FROM users").unwrap())
        .unwrap();
    assert!(res.contains("Alice"));

    // Rollback
    exec.execute(Parser::parse("ROLLBACK").unwrap()).unwrap();

    // Verify it's gone
    let res = exec
        .execute(Parser::parse("SELECT * FROM users").unwrap())
        .unwrap();
    assert!(!res.contains("Alice"));

    // 2. Commit test
    exec.execute(Parser::parse("BEGIN").unwrap()).unwrap();
    exec.execute(Parser::parse("INSERT INTO users VALUES(2, 'Bob')").unwrap())
        .unwrap();
    exec.execute(Parser::parse("COMMIT").unwrap()).unwrap();

    let res = exec
        .execute(Parser::parse("SELECT * FROM users").unwrap())
        .unwrap();
    assert!(res.contains("Bob"));
}

#[test]
fn test_insert_with_commas_in_values() {
    let dir = tempdir().unwrap();
    let (mut db, _) = setup_executor(&dir);
    let mut exec = Executor::new(&mut db);

    exec.execute(Parser::parse("CREATE TABLE notes(id INT, content TEXT)").unwrap())
        .unwrap();
    exec.execute(Parser::parse("INSERT INTO notes VALUES(1, 'hello, world')").unwrap())
        .unwrap();

    let res = exec
        .execute(Parser::parse("SELECT * FROM notes").unwrap())
        .unwrap();
    assert!(res.contains("hello, world"));
}

#[test]
fn test_schemas_and_namespaces() {
    let dir = tempdir().unwrap();
    let (mut db, _) = setup_executor(&dir);
    let mut exec = Executor::new(&mut db);

    // 1. Create Schema
    let res = exec.execute(Parser::parse("CREATE SCHEMA analytics").unwrap()).unwrap();
    assert!(res.contains("schema 'analytics' created"));

    // 2. Show Schemas
    let schemas_res = exec.execute(Parser::parse("SHOW SCHEMAS").unwrap()).unwrap();
    assert!(schemas_res.contains("analytics"));
    assert!(schemas_res.contains("public"));

    // 3. Create Table under qualified schema name
    exec.execute(Parser::parse("CREATE TABLE analytics.events(id INT, event_name TEXT)").unwrap())
        .unwrap();

    // 4. Insert into qualified table
    exec.execute(Parser::parse("INSERT INTO analytics.events VALUES(101, 'click')").unwrap())
        .unwrap();

    // 5. Select from qualified table
    let sel_res = exec.execute(Parser::parse("SELECT * FROM analytics.events").unwrap()).unwrap();
    assert!(sel_res.contains("101 | click"));
}

#[test]
fn test_data_type_validation_and_not_null() {
    let dir = tempdir().unwrap();
    let (mut db, _) = setup_executor(&dir);
    let mut exec = Executor::new(&mut db);

    // Create table with INT, TEXT NOT NULL PRIMARY KEY
    exec.execute(Parser::parse("CREATE TABLE products(id INT NOT NULL PRIMARY KEY, name TEXT NOT NULL, price FLOAT)").unwrap())
        .unwrap();

    // Valid insert
    let res = exec.execute(Parser::parse("INSERT INTO products VALUES(1, 'Laptop', 999.99)").unwrap()).unwrap();
    assert!(res.contains("1 row inserted"));

    // Invalid INT type
    let err_type = exec.execute(Parser::parse("INSERT INTO products VALUES('invalid_num', 'Mouse', 19.99)").unwrap());
    assert!(err_type.is_err() || err_type.unwrap_err().to_string().contains("Cannot parse"));

    // NOT NULL violation
    let err_null = exec.execute(Parser::parse("INSERT INTO products VALUES(2, NULL, 49.99)").unwrap());
    assert!(err_null.is_err() || err_null.unwrap_err().to_string().contains("Constraint Violation"));
}

#[test]
fn test_information_schema() {
    let dir = tempdir().unwrap();
    let (mut db, _) = setup_executor(&dir);
    let mut exec = Executor::new(&mut db);

    exec.execute(Parser::parse("CREATE TABLE users(id INT NOT NULL PRIMARY KEY, email TEXT)").unwrap())
        .unwrap();

    let tables_res = exec.execute(Parser::parse("SELECT * FROM information_schema.tables").unwrap()).unwrap();
    assert!(tables_res.contains("public"));
    assert!(tables_res.contains("users"));

    let cols_res = exec.execute(Parser::parse("SELECT * FROM information_schema.columns").unwrap()).unwrap();
    assert!(cols_res.contains("id"));
    assert!(cols_res.contains("email"));
    assert!(cols_res.contains("INTEGER"));
    assert!(cols_res.contains("TEXT"));
}

#[test]
fn test_drop_table() {
    let dir = tempdir().unwrap();
    let (mut db, _) = setup_executor(&dir);
    let mut exec = Executor::new(&mut db);

    exec.execute(Parser::parse("CREATE TABLE dt(id INT PRIMARY KEY)").unwrap()).unwrap();
    exec.execute(Parser::parse("INSERT INTO dt VALUES(1)").unwrap()).unwrap();
    
    let res = exec.execute(Parser::parse("DROP TABLE dt").unwrap()).unwrap();
    assert!(res.contains("Query OK"));
    
    let err = exec.execute(Parser::parse("SELECT * FROM dt").unwrap());
    assert!(err.is_err());
}

#[test]
fn test_update_and_delete() {
    let dir = tempdir().unwrap();
    let (mut db, _) = setup_executor(&dir);
    let mut exec = Executor::new(&mut db);

    exec.execute(Parser::parse("CREATE TABLE ud(id INT PRIMARY KEY, name TEXT)").unwrap()).unwrap();
    exec.execute(Parser::parse("INSERT INTO ud VALUES(1, 'Alice'), (2, 'Bob'), (3, 'Charlie')").unwrap()).unwrap();

    let res = exec.execute(Parser::parse("UPDATE ud SET name = 'Alicia' WHERE id = 1").unwrap()).unwrap();
    assert!(res.contains("1 row updated"));

    let select_res = exec.execute(Parser::parse("SELECT * FROM ud WHERE id = 1").unwrap()).unwrap();
    assert!(select_res.contains("Alicia"));

    let res_del = exec.execute(Parser::parse("DELETE FROM ud WHERE id = 2").unwrap()).unwrap();
    assert!(res_del.contains("1 row deleted"));

    let select_res_2 = exec.execute(Parser::parse("SELECT * FROM ud").unwrap()).unwrap();
    assert!(!select_res_2.contains("Bob"));
    
    let res_del_all = exec.execute(Parser::parse("DELETE FROM ud").unwrap()).unwrap();
    assert!(res_del_all.contains("2 rows deleted"));
}

#[test]
fn test_unique_and_default() {
    let dir = tempdir().unwrap();
    let (mut db, _) = setup_executor(&dir);
    let mut exec = Executor::new(&mut db);

    exec.execute(Parser::parse("CREATE TABLE ud(id INT PRIMARY KEY, name TEXT UNIQUE, age INT DEFAULT 18)").unwrap()).unwrap();
    exec.execute(Parser::parse("INSERT INTO ud VALUES(1, 'Alice')").unwrap()).unwrap();

    // Missing column `age` should be padded with 18
    let res = exec.execute(Parser::parse("SELECT * FROM ud WHERE id = 1").unwrap()).unwrap();
    assert!(res.contains("18"));

    // Duplicate name should fail UNIQUE constraint
    let err = exec.execute(Parser::parse("INSERT INTO ud VALUES(2, 'Alice')").unwrap());
    assert!(err.is_err());
    let err_msg = err.unwrap_err().to_string();
    assert!(err_msg.contains("UNIQUE constraint violation"));
    
    // Duplicate ID should fail PRIMARY KEY unique constraint
    let err2 = exec.execute(Parser::parse("INSERT INTO ud VALUES(1, 'Bob')").unwrap());
    assert!(err2.is_err());
    let err_msg2 = err2.unwrap_err().to_string();
    assert!(err_msg2.contains("UNIQUE constraint violation"));
}

#[test]
fn test_alter_table_add_column() {
    let dir = tempdir().unwrap();
    let (mut db, _) = setup_executor(&dir);
    let mut exec = Executor::new(&mut db);

    exec.execute(Parser::parse("CREATE TABLE at(id INT)").unwrap()).unwrap();
    exec.execute(Parser::parse("INSERT INTO at VALUES(1)").unwrap()).unwrap();

    let res1 = exec.execute(Parser::parse("SELECT * FROM at").unwrap()).unwrap();
    assert!(res1.contains("1"));

    // Alter table
    exec.execute(Parser::parse("ALTER TABLE at ADD COLUMN name TEXT DEFAULT 'Anonymous'").unwrap()).unwrap();

    // Query old row, should have 'Anonymous'
    let res2 = exec.execute(Parser::parse("SELECT * FROM at").unwrap()).unwrap();
    assert!(res2.contains("Anonymous"));

    // Insert new row
    exec.execute(Parser::parse("INSERT INTO at VALUES(2, 'Bob')").unwrap()).unwrap();
    let res3 = exec.execute(Parser::parse("SELECT * FROM at WHERE id = 2").unwrap()).unwrap();
    assert!(res3.contains("Bob"));
}

#[test]
fn test_advanced_sql() {
    let dir = tempdir().unwrap();
    let (mut db, _) = setup_executor(&dir);
    let mut exec = Executor::new(&mut db);

    exec.execute(Parser::parse("CREATE TABLE t1(id INT, name TEXT)").unwrap()).unwrap();
    exec.execute(Parser::parse("INSERT INTO t1 VALUES(1, 'A')").unwrap()).unwrap();
    exec.execute(Parser::parse("INSERT INTO t1 VALUES(2, 'B')").unwrap()).unwrap();
    
    exec.execute(Parser::parse("CREATE TABLE t2(id INT, name TEXT)").unwrap()).unwrap();
    exec.execute(Parser::parse("INSERT INTO t2 VALUES(2, 'B')").unwrap()).unwrap();
    exec.execute(Parser::parse("INSERT INTO t2 VALUES(3, 'C')").unwrap()).unwrap();

    // UNION
    let res_union = exec.execute(Parser::parse("SELECT * FROM t1 UNION SELECT * FROM t2").unwrap()).unwrap();
    assert!(res_union.contains("3 row(s)")); // A, B, C (no duplicates)
    
    // UNION ALL
    let res_union_all = exec.execute(Parser::parse("SELECT * FROM t1 UNION ALL SELECT * FROM t2").unwrap()).unwrap();
    assert!(res_union_all.contains("4 row(s)")); // A, B, B, C
    
    // SUBQUERY
    let res_subq = exec.execute(Parser::parse("SELECT * FROM t1 WHERE id IN (SELECT id FROM t2)").unwrap()).unwrap();
    assert!(res_subq.contains("1 row(s)")); // Only 2, 'B'
    
    // CTE
    let res_cte = exec.execute(Parser::parse("WITH temp AS (SELECT * FROM t1) SELECT * FROM temp").unwrap()).unwrap();
    assert!(res_cte.contains("2 row(s)")); // 1, 'A' and 2, 'B'
    
    // WINDOW FUNCTION
    exec.execute(Parser::parse("INSERT INTO t1 VALUES(3, 'A')").unwrap()).unwrap();
    let res_win = exec.execute(Parser::parse("SELECT ROW_NUMBER() OVER(PARTITION BY name ORDER BY id) FROM t1").unwrap()).unwrap();
    assert!(res_win.contains("3 row(s)"));
    assert!(res_win.contains("row_number"));
}

#[test]
fn test_advanced_sql_more_subqueries() {
    let dir = tempdir().unwrap();
    let (mut db, _) = setup_executor(&dir);
    let mut exec = Executor::new(&mut db);

    exec.execute(Parser::parse("CREATE TABLE dept(id INT, dname TEXT)").unwrap()).unwrap();
    exec.execute(Parser::parse("CREATE TABLE emp(id INT, name TEXT, dept_id INT)").unwrap()).unwrap();

    exec.execute(Parser::parse("INSERT INTO dept VALUES(1, 'Engineering')").unwrap()).unwrap();
    exec.execute(Parser::parse("INSERT INTO dept VALUES(2, 'Sales')").unwrap()).unwrap();

    exec.execute(Parser::parse("INSERT INTO emp VALUES(10, 'Alice', 1)").unwrap()).unwrap();
    exec.execute(Parser::parse("INSERT INTO emp VALUES(20, 'Bob', 2)").unwrap()).unwrap();
    exec.execute(Parser::parse("INSERT INTO emp VALUES(30, 'Charlie', 3)").unwrap()).unwrap(); // No such dept

    let res = exec.execute(Parser::parse("SELECT * FROM emp WHERE dept_id IN (SELECT id FROM dept)").unwrap()).unwrap();
    assert!(res.contains("Alice"));
    assert!(res.contains("Bob"));
    assert!(!res.contains("Charlie"));
}

#[test]
fn test_advanced_sql_more_ctes() {
    let dir = tempdir().unwrap();
    let (mut db, _) = setup_executor(&dir);
    let mut exec = Executor::new(&mut db);

    exec.execute(Parser::parse("CREATE TABLE nums(val INT)").unwrap()).unwrap();
    exec.execute(Parser::parse("INSERT INTO nums VALUES(1)").unwrap()).unwrap();
    exec.execute(Parser::parse("INSERT INTO nums VALUES(2)").unwrap()).unwrap();
    exec.execute(Parser::parse("INSERT INTO nums VALUES(3)").unwrap()).unwrap();

    let res = exec.execute(Parser::parse("WITH temp1 AS (SELECT * FROM nums WHERE val = 2) SELECT * FROM temp1").unwrap()).unwrap();
    assert!(res.contains("1 row(s)"));
    assert!(res.contains("2"));
    assert!(!res.contains("1"));
    assert!(!res.contains("3"));
}

#[test]
fn test_advanced_sql_more_window_functions() {
    let dir = tempdir().unwrap();
    let (mut db, _) = setup_executor(&dir);
    let mut exec = Executor::new(&mut db);

    exec.execute(Parser::parse("CREATE TABLE scores(player TEXT, score INT)").unwrap()).unwrap();
    exec.execute(Parser::parse("INSERT INTO scores VALUES('P1', 100)").unwrap()).unwrap();
    exec.execute(Parser::parse("INSERT INTO scores VALUES('P1', 200)").unwrap()).unwrap();
    exec.execute(Parser::parse("INSERT INTO scores VALUES('P2', 150)").unwrap()).unwrap();
    exec.execute(Parser::parse("INSERT INTO scores VALUES('P2', 50)").unwrap()).unwrap();

    // Partition by player, order by score
    let res = exec.execute(Parser::parse("SELECT ROW_NUMBER() OVER(PARTITION BY player ORDER BY score) FROM scores").unwrap()).unwrap();
    assert!(res.contains("4 row(s)"));
    
    let res_str = res.to_string();
    assert!(res_str.contains("P1 | 100 | 1"));
    assert!(res_str.contains("P1 | 200 | 2"));
    assert!(res_str.contains("P2 | 50 | 1"));
    assert!(res_str.contains("P2 | 150 | 2"));
}

#[test]
fn test_advanced_sql_more_unions() {
    let dir = tempdir().unwrap();
    let (mut db, _) = setup_executor(&dir);
    let mut exec = Executor::new(&mut db);

    exec.execute(Parser::parse("CREATE TABLE A(val INT)").unwrap()).unwrap();
    exec.execute(Parser::parse("CREATE TABLE B(val INT)").unwrap()).unwrap();

    exec.execute(Parser::parse("INSERT INTO A VALUES(10)").unwrap()).unwrap();
    exec.execute(Parser::parse("INSERT INTO A VALUES(20)").unwrap()).unwrap();

    exec.execute(Parser::parse("INSERT INTO B VALUES(20)").unwrap()).unwrap();
    exec.execute(Parser::parse("INSERT INTO B VALUES(30)").unwrap()).unwrap();

    let res_union = exec.execute(Parser::parse("SELECT * FROM A UNION SELECT * FROM B").unwrap()).unwrap();
    assert!(res_union.contains("3 row(s)")); // 10, 20, 30

    let res_union_all = exec.execute(Parser::parse("SELECT * FROM A UNION ALL SELECT * FROM B").unwrap()).unwrap();
    assert!(res_union_all.contains("4 row(s)")); // 10, 20, 20, 30
}