rusqlite/transaction.rs
1use crate::{Connection, Result};
2use std::ops::Deref;
3
4/// Options for transaction behavior. See [BEGIN
5/// TRANSACTION](http://www.sqlite.org/lang_transaction.html) for details.
6#[derive(Copy, Clone)]
7#[non_exhaustive]
8pub enum TransactionBehavior {
9 /// DEFERRED means that the transaction does not actually start until the
10 /// database is first accessed.
11 Deferred,
12 /// IMMEDIATE cause the database connection to start a new write
13 /// immediately, without waiting for a writes statement.
14 Immediate,
15 /// EXCLUSIVE prevents other database connections from reading the database
16 /// while the transaction is underway.
17 Exclusive,
18}
19
20/// Options for how a Transaction or Savepoint should behave when it is dropped.
21#[derive(Copy, Clone, Debug, PartialEq, Eq)]
22#[non_exhaustive]
23pub enum DropBehavior {
24 /// Roll back the changes. This is the default.
25 Rollback,
26
27 /// Commit the changes.
28 Commit,
29
30 /// Do not commit or roll back changes - this will leave the transaction or
31 /// savepoint open, so should be used with care.
32 Ignore,
33
34 /// Panic. Used to enforce intentional behavior during development.
35 Panic,
36}
37
38/// Represents a transaction on a database connection.
39///
40/// ## Note
41///
42/// Transactions will roll back by default. Use `commit` method to explicitly
43/// commit the transaction, or use `set_drop_behavior` to change what happens
44/// when the transaction is dropped.
45///
46/// ## Example
47///
48/// ```rust,no_run
49/// # use rusqlite::{Connection, Result};
50/// # fn do_queries_part_1(_conn: &Connection) -> Result<()> { Ok(()) }
51/// # fn do_queries_part_2(_conn: &Connection) -> Result<()> { Ok(()) }
52/// fn perform_queries(conn: &mut Connection) -> Result<()> {
53/// let tx = conn.transaction()?;
54///
55/// do_queries_part_1(&tx)?; // tx causes rollback if this fails
56/// do_queries_part_2(&tx)?; // tx causes rollback if this fails
57///
58/// tx.commit()
59/// }
60/// ```
61#[derive(Debug)]
62pub struct Transaction<'conn> {
63 conn: &'conn Connection,
64 drop_behavior: DropBehavior,
65}
66
67/// Represents a savepoint on a database connection.
68///
69/// ## Note
70///
71/// Savepoints will roll back by default. Use `commit` method to explicitly
72/// commit the savepoint, or use `set_drop_behavior` to change what happens
73/// when the savepoint is dropped.
74///
75/// ## Example
76///
77/// ```rust,no_run
78/// # use rusqlite::{Connection, Result};
79/// # fn do_queries_part_1(_conn: &Connection) -> Result<()> { Ok(()) }
80/// # fn do_queries_part_2(_conn: &Connection) -> Result<()> { Ok(()) }
81/// fn perform_queries(conn: &mut Connection) -> Result<()> {
82/// let sp = conn.savepoint()?;
83///
84/// do_queries_part_1(&sp)?; // sp causes rollback if this fails
85/// do_queries_part_2(&sp)?; // sp causes rollback if this fails
86///
87/// sp.commit()
88/// }
89/// ```
90#[derive(Debug)]
91pub struct Savepoint<'conn> {
92 conn: &'conn Connection,
93 name: String,
94 drop_behavior: DropBehavior,
95 committed: bool,
96}
97
98impl Transaction<'_> {
99 /// Begin a new transaction. Cannot be nested; see `savepoint` for nested
100 /// transactions.
101 ///
102 /// Even though we don't mutate the connection, we take a `&mut Connection`
103 /// to prevent nested transactions on the same connection. For cases
104 /// where this is unacceptable, [`Transaction::new_unchecked`] is available.
105 #[inline]
106 pub fn new(conn: &mut Connection, behavior: TransactionBehavior) -> Result<Transaction<'_>> {
107 Self::new_unchecked(conn, behavior)
108 }
109
110 /// Begin a new transaction, failing if a transaction is open.
111 ///
112 /// If a transaction is already open, this will return an error. Where
113 /// possible, [`Transaction::new`] should be preferred, as it provides a
114 /// compile-time guarantee that transactions are not nested.
115 #[inline]
116 pub fn new_unchecked(
117 conn: &Connection,
118 behavior: TransactionBehavior,
119 ) -> Result<Transaction<'_>> {
120 let query = match behavior {
121 TransactionBehavior::Deferred => "BEGIN DEFERRED",
122 TransactionBehavior::Immediate => "BEGIN IMMEDIATE",
123 TransactionBehavior::Exclusive => "BEGIN EXCLUSIVE",
124 };
125 conn.execute_batch(query).map(move |()| Transaction {
126 conn,
127 drop_behavior: DropBehavior::Rollback,
128 })
129 }
130
131 /// Starts a new [savepoint](http://www.sqlite.org/lang_savepoint.html), allowing nested
132 /// transactions.
133 ///
134 /// ## Note
135 ///
136 /// Just like outer level transactions, savepoint transactions rollback by
137 /// default.
138 ///
139 /// ## Example
140 ///
141 /// ```rust,no_run
142 /// # use rusqlite::{Connection, Result};
143 /// # fn perform_queries_part_1_succeeds(_conn: &Connection) -> bool { true }
144 /// fn perform_queries(conn: &mut Connection) -> Result<()> {
145 /// let mut tx = conn.transaction()?;
146 ///
147 /// {
148 /// let sp = tx.savepoint()?;
149 /// if perform_queries_part_1_succeeds(&sp) {
150 /// sp.commit()?;
151 /// }
152 /// // otherwise, sp will rollback
153 /// }
154 ///
155 /// tx.commit()
156 /// }
157 /// ```
158 #[inline]
159 pub fn savepoint(&mut self) -> Result<Savepoint<'_>> {
160 Savepoint::new_(self.conn)
161 }
162
163 /// Create a new savepoint with a custom savepoint name. See `savepoint()`.
164 #[inline]
165 pub fn savepoint_with_name<T: Into<String>>(&mut self, name: T) -> Result<Savepoint<'_>> {
166 Savepoint::with_name_(self.conn, name)
167 }
168
169 /// Get the current setting for what happens to the transaction when it is
170 /// dropped.
171 #[inline]
172 #[must_use]
173 pub fn drop_behavior(&self) -> DropBehavior {
174 self.drop_behavior
175 }
176
177 /// Configure the transaction to perform the specified action when it is
178 /// dropped.
179 #[inline]
180 pub fn set_drop_behavior(&mut self, drop_behavior: DropBehavior) {
181 self.drop_behavior = drop_behavior;
182 }
183
184 /// A convenience method which consumes and commits a transaction.
185 #[inline]
186 pub fn commit(mut self) -> Result<()> {
187 self.commit_()
188 }
189
190 #[inline]
191 fn commit_(&mut self) -> Result<()> {
192 self.conn.execute_batch("COMMIT")?;
193 Ok(())
194 }
195
196 /// A convenience method which consumes and rolls back a transaction.
197 #[inline]
198 pub fn rollback(mut self) -> Result<()> {
199 self.rollback_()
200 }
201
202 #[inline]
203 fn rollback_(&mut self) -> Result<()> {
204 self.conn.execute_batch("ROLLBACK")?;
205 Ok(())
206 }
207
208 /// Consumes the transaction, committing or rolling back according to the
209 /// current setting (see `drop_behavior`).
210 ///
211 /// Functionally equivalent to the `Drop` implementation, but allows
212 /// callers to see any errors that occur.
213 #[inline]
214 pub fn finish(mut self) -> Result<()> {
215 self.finish_()
216 }
217
218 #[inline]
219 fn finish_(&mut self) -> Result<()> {
220 if self.conn.is_autocommit() {
221 return Ok(());
222 }
223 match self.drop_behavior() {
224 DropBehavior::Commit => self.commit_().or_else(|_| self.rollback_()),
225 DropBehavior::Rollback => self.rollback_(),
226 DropBehavior::Ignore => Ok(()),
227 DropBehavior::Panic => panic!("Transaction dropped unexpectedly."),
228 }
229 }
230}
231
232impl Deref for Transaction<'_> {
233 type Target = Connection;
234
235 #[inline]
236 fn deref(&self) -> &Connection {
237 self.conn
238 }
239}
240
241#[expect(unused_must_use)]
242impl Drop for Transaction<'_> {
243 #[inline]
244 fn drop(&mut self) {
245 self.finish_();
246 }
247}
248
249impl Savepoint<'_> {
250 #[inline]
251 fn with_name_<T: Into<String>>(conn: &Connection, name: T) -> Result<Savepoint<'_>> {
252 let name = name.into();
253 conn.execute_batch(&format!("SAVEPOINT {name}"))
254 .map(|()| Savepoint {
255 conn,
256 name,
257 drop_behavior: DropBehavior::Rollback,
258 committed: false,
259 })
260 }
261
262 #[inline]
263 fn new_(conn: &Connection) -> Result<Savepoint<'_>> {
264 Savepoint::with_name_(conn, "_rusqlite_sp")
265 }
266
267 /// Begin a new savepoint. Can be nested.
268 #[inline]
269 pub fn new(conn: &mut Connection) -> Result<Savepoint<'_>> {
270 Savepoint::new_(conn)
271 }
272
273 /// Begin a new savepoint with a user-provided savepoint name.
274 #[inline]
275 pub fn with_name<T: Into<String>>(conn: &mut Connection, name: T) -> Result<Savepoint<'_>> {
276 Savepoint::with_name_(conn, name)
277 }
278
279 /// Begin a nested savepoint.
280 #[inline]
281 pub fn savepoint(&mut self) -> Result<Savepoint<'_>> {
282 Savepoint::new_(self.conn)
283 }
284
285 /// Begin a nested savepoint with a user-provided savepoint name.
286 #[inline]
287 pub fn savepoint_with_name<T: Into<String>>(&mut self, name: T) -> Result<Savepoint<'_>> {
288 Savepoint::with_name_(self.conn, name)
289 }
290
291 /// Get the current setting for what happens to the savepoint when it is
292 /// dropped.
293 #[inline]
294 #[must_use]
295 pub fn drop_behavior(&self) -> DropBehavior {
296 self.drop_behavior
297 }
298
299 /// Configure the savepoint to perform the specified action when it is
300 /// dropped.
301 #[inline]
302 pub fn set_drop_behavior(&mut self, drop_behavior: DropBehavior) {
303 self.drop_behavior = drop_behavior;
304 }
305
306 /// A convenience method which consumes and commits a savepoint.
307 #[inline]
308 pub fn commit(mut self) -> Result<()> {
309 self.commit_()
310 }
311
312 #[inline]
313 fn commit_(&mut self) -> Result<()> {
314 self.conn.execute_batch(&format!("RELEASE {}", self.name))?;
315 self.committed = true;
316 Ok(())
317 }
318
319 /// A convenience method which rolls back a savepoint.
320 ///
321 /// ## Note
322 ///
323 /// Unlike `Transaction`s, savepoints remain active after they have been
324 /// rolled back, and can be rolled back again or committed.
325 #[inline]
326 pub fn rollback(&mut self) -> Result<()> {
327 self.conn
328 .execute_batch(&format!("ROLLBACK TO {}", self.name))
329 }
330
331 /// Consumes the savepoint, committing or rolling back according to the
332 /// current setting (see `drop_behavior`).
333 ///
334 /// Functionally equivalent to the `Drop` implementation, but allows
335 /// callers to see any errors that occur.
336 #[inline]
337 pub fn finish(mut self) -> Result<()> {
338 self.finish_()
339 }
340
341 #[inline]
342 fn finish_(&mut self) -> Result<()> {
343 if self.committed {
344 return Ok(());
345 }
346 match self.drop_behavior() {
347 DropBehavior::Commit => self
348 .commit_()
349 .or_else(|_| self.rollback().and_then(|()| self.commit_())),
350 DropBehavior::Rollback => self.rollback().and_then(|()| self.commit_()),
351 DropBehavior::Ignore => Ok(()),
352 DropBehavior::Panic => panic!("Savepoint dropped unexpectedly."),
353 }
354 }
355}
356
357impl Deref for Savepoint<'_> {
358 type Target = Connection;
359
360 #[inline]
361 fn deref(&self) -> &Connection {
362 self.conn
363 }
364}
365
366#[expect(unused_must_use)]
367impl Drop for Savepoint<'_> {
368 #[inline]
369 fn drop(&mut self) {
370 self.finish_();
371 }
372}
373
374/// Transaction state of a database
375#[derive(Clone, Copy, Debug, PartialEq, Eq)]
376#[non_exhaustive]
377#[cfg(feature = "modern_sqlite")] // 3.37.0
378#[cfg_attr(docsrs, doc(cfg(feature = "modern_sqlite")))]
379pub enum TransactionState {
380 /// Equivalent to `SQLITE_TXN_NONE`
381 None,
382 /// Equivalent to `SQLITE_TXN_READ`
383 Read,
384 /// Equivalent to `SQLITE_TXN_WRITE`
385 Write,
386}
387
388impl Connection {
389 /// Begin a new transaction with the default behavior (DEFERRED).
390 ///
391 /// The transaction defaults to rolling back when it is dropped. If you
392 /// want the transaction to commit, you must call
393 /// [`commit`](Transaction::commit) or
394 /// [`set_drop_behavior(DropBehavior::Commit)`](Transaction::set_drop_behavior).
395 ///
396 /// ## Example
397 ///
398 /// ```rust,no_run
399 /// # use rusqlite::{Connection, Result};
400 /// # fn do_queries_part_1(_conn: &Connection) -> Result<()> { Ok(()) }
401 /// # fn do_queries_part_2(_conn: &Connection) -> Result<()> { Ok(()) }
402 /// fn perform_queries(conn: &mut Connection) -> Result<()> {
403 /// let tx = conn.transaction()?;
404 ///
405 /// do_queries_part_1(&tx)?; // tx causes rollback if this fails
406 /// do_queries_part_2(&tx)?; // tx causes rollback if this fails
407 ///
408 /// tx.commit()
409 /// }
410 /// ```
411 ///
412 /// # Failure
413 ///
414 /// Will return `Err` if the underlying SQLite call fails.
415 #[inline]
416 pub fn transaction(&mut self) -> Result<Transaction<'_>> {
417 Transaction::new(self, self.transaction_behavior)
418 }
419
420 /// Begin a new transaction with a specified behavior.
421 ///
422 /// See [`transaction`](Connection::transaction).
423 ///
424 /// # Failure
425 ///
426 /// Will return `Err` if the underlying SQLite call fails.
427 #[inline]
428 pub fn transaction_with_behavior(
429 &mut self,
430 behavior: TransactionBehavior,
431 ) -> Result<Transaction<'_>> {
432 Transaction::new(self, behavior)
433 }
434
435 /// Begin a new transaction with the default behavior (DEFERRED).
436 ///
437 /// Attempt to open a nested transaction will result in a SQLite error.
438 /// `Connection::transaction` prevents this at compile time by taking `&mut
439 /// self`, but `Connection::unchecked_transaction()` may be used to defer
440 /// the checking until runtime.
441 ///
442 /// See [`Connection::transaction`] and [`Transaction::new_unchecked`]
443 /// (which can be used if the default transaction behavior is undesirable).
444 ///
445 /// ## Example
446 ///
447 /// ```rust,no_run
448 /// # use rusqlite::{Connection, Result};
449 /// # use std::rc::Rc;
450 /// # fn do_queries_part_1(_conn: &Connection) -> Result<()> { Ok(()) }
451 /// # fn do_queries_part_2(_conn: &Connection) -> Result<()> { Ok(()) }
452 /// fn perform_queries(conn: Rc<Connection>) -> Result<()> {
453 /// let tx = conn.unchecked_transaction()?;
454 ///
455 /// do_queries_part_1(&tx)?; // tx causes rollback if this fails
456 /// do_queries_part_2(&tx)?; // tx causes rollback if this fails
457 ///
458 /// tx.commit()
459 /// }
460 /// ```
461 ///
462 /// # Failure
463 ///
464 /// Will return `Err` if the underlying SQLite call fails. The specific
465 /// error returned if transactions are nested is currently unspecified.
466 pub fn unchecked_transaction(&self) -> Result<Transaction<'_>> {
467 Transaction::new_unchecked(self, self.transaction_behavior)
468 }
469
470 /// Begin a new savepoint with the default behavior (DEFERRED).
471 ///
472 /// The savepoint defaults to rolling back when it is dropped. If you want
473 /// the savepoint to commit, you must call [`commit`](Savepoint::commit) or
474 /// [`set_drop_behavior(DropBehavior::Commit)`](Savepoint::set_drop_behavior).
475 ///
476 /// ## Example
477 ///
478 /// ```rust,no_run
479 /// # use rusqlite::{Connection, Result};
480 /// # fn do_queries_part_1(_conn: &Connection) -> Result<()> { Ok(()) }
481 /// # fn do_queries_part_2(_conn: &Connection) -> Result<()> { Ok(()) }
482 /// fn perform_queries(conn: &mut Connection) -> Result<()> {
483 /// let sp = conn.savepoint()?;
484 ///
485 /// do_queries_part_1(&sp)?; // sp causes rollback if this fails
486 /// do_queries_part_2(&sp)?; // sp causes rollback if this fails
487 ///
488 /// sp.commit()
489 /// }
490 /// ```
491 ///
492 /// # Failure
493 ///
494 /// Will return `Err` if the underlying SQLite call fails.
495 #[inline]
496 pub fn savepoint(&mut self) -> Result<Savepoint<'_>> {
497 Savepoint::new(self)
498 }
499
500 /// Begin a new savepoint with a specified name.
501 ///
502 /// See [`savepoint`](Connection::savepoint).
503 ///
504 /// # Failure
505 ///
506 /// Will return `Err` if the underlying SQLite call fails.
507 #[inline]
508 pub fn savepoint_with_name<T: Into<String>>(&mut self, name: T) -> Result<Savepoint<'_>> {
509 Savepoint::with_name(self, name)
510 }
511
512 /// Determine the transaction state of a database
513 #[cfg(feature = "modern_sqlite")] // 3.37.0
514 #[cfg_attr(docsrs, doc(cfg(feature = "modern_sqlite")))]
515 pub fn transaction_state(
516 &self,
517 db_name: Option<crate::DatabaseName<'_>>,
518 ) -> Result<TransactionState> {
519 self.db.borrow().txn_state(db_name)
520 }
521
522 /// Set the default transaction behavior for the connection.
523 ///
524 /// ## Note
525 ///
526 /// This will only apply to transactions initiated by [`transaction`](Connection::transaction)
527 /// or [`unchecked_transaction`](Connection::unchecked_transaction).
528 ///
529 /// ## Example
530 ///
531 /// ```rust,no_run
532 /// # use rusqlite::{Connection, Result, TransactionBehavior};
533 /// # fn do_queries_part_1(_conn: &Connection) -> Result<()> { Ok(()) }
534 /// # fn do_queries_part_2(_conn: &Connection) -> Result<()> { Ok(()) }
535 /// fn perform_queries(conn: &mut Connection) -> Result<()> {
536 /// conn.set_transaction_behavior(TransactionBehavior::Immediate);
537 ///
538 /// let tx = conn.transaction()?;
539 ///
540 /// do_queries_part_1(&tx)?; // tx causes rollback if this fails
541 /// do_queries_part_2(&tx)?; // tx causes rollback if this fails
542 ///
543 /// tx.commit()
544 /// }
545 /// ```
546 pub fn set_transaction_behavior(&mut self, behavior: TransactionBehavior) {
547 self.transaction_behavior = behavior;
548 }
549}
550
551#[cfg(test)]
552mod test {
553 use super::DropBehavior;
554 use crate::{Connection, Error, Result};
555
556 fn checked_memory_handle() -> Result<Connection> {
557 let db = Connection::open_in_memory()?;
558 db.execute_batch("CREATE TABLE foo (x INTEGER)")?;
559 Ok(db)
560 }
561
562 #[test]
563 fn test_drop() -> Result<()> {
564 let mut db = checked_memory_handle()?;
565 {
566 let tx = db.transaction()?;
567 tx.execute_batch("INSERT INTO foo VALUES(1)")?;
568 // default: rollback
569 }
570 {
571 let mut tx = db.transaction()?;
572 tx.execute_batch("INSERT INTO foo VALUES(2)")?;
573 tx.set_drop_behavior(DropBehavior::Commit)
574 }
575 {
576 let tx = db.transaction()?;
577 assert_eq!(2i32, tx.one_column::<i32>("SELECT SUM(x) FROM foo")?);
578 }
579 Ok(())
580 }
581 fn assert_nested_tx_error(e: Error) {
582 if let Error::SqliteFailure(e, Some(m)) = &e {
583 assert_eq!(e.extended_code, crate::ffi::SQLITE_ERROR);
584 // FIXME: Not ideal...
585 assert_eq!(e.code, crate::ErrorCode::Unknown);
586 assert!(m.contains("transaction"));
587 } else {
588 panic!("Unexpected error type: {e:?}");
589 }
590 }
591
592 #[test]
593 fn test_unchecked_nesting() -> Result<()> {
594 let db = checked_memory_handle()?;
595
596 {
597 let tx = db.unchecked_transaction()?;
598 let e = tx.unchecked_transaction().unwrap_err();
599 assert_nested_tx_error(e);
600 // default: rollback
601 }
602 {
603 let tx = db.unchecked_transaction()?;
604 tx.execute_batch("INSERT INTO foo VALUES(1)")?;
605 // Ensure this doesn't interfere with ongoing transaction
606 let e = tx.unchecked_transaction().unwrap_err();
607 assert_nested_tx_error(e);
608
609 tx.execute_batch("INSERT INTO foo VALUES(1)")?;
610 tx.commit()?;
611 }
612
613 assert_eq!(2i32, db.one_column::<i32>("SELECT SUM(x) FROM foo")?);
614 Ok(())
615 }
616
617 #[test]
618 fn test_explicit_rollback_commit() -> Result<()> {
619 let mut db = checked_memory_handle()?;
620 {
621 let mut tx = db.transaction()?;
622 {
623 let mut sp = tx.savepoint()?;
624 sp.execute_batch("INSERT INTO foo VALUES(1)")?;
625 sp.rollback()?;
626 sp.execute_batch("INSERT INTO foo VALUES(2)")?;
627 sp.commit()?;
628 }
629 tx.commit()?;
630 }
631 {
632 let tx = db.transaction()?;
633 tx.execute_batch("INSERT INTO foo VALUES(4)")?;
634 tx.commit()?;
635 }
636 {
637 let tx = db.transaction()?;
638 assert_eq!(6i32, tx.one_column::<i32>("SELECT SUM(x) FROM foo")?);
639 }
640 Ok(())
641 }
642
643 #[test]
644 fn test_savepoint() -> Result<()> {
645 let mut db = checked_memory_handle()?;
646 {
647 let mut tx = db.transaction()?;
648 tx.execute_batch("INSERT INTO foo VALUES(1)")?;
649 assert_current_sum(1, &tx)?;
650 tx.set_drop_behavior(DropBehavior::Commit);
651 {
652 let mut sp1 = tx.savepoint()?;
653 sp1.execute_batch("INSERT INTO foo VALUES(2)")?;
654 assert_current_sum(3, &sp1)?;
655 // will roll back sp1
656 {
657 let mut sp2 = sp1.savepoint()?;
658 sp2.execute_batch("INSERT INTO foo VALUES(4)")?;
659 assert_current_sum(7, &sp2)?;
660 // will roll back sp2
661 {
662 let sp3 = sp2.savepoint()?;
663 sp3.execute_batch("INSERT INTO foo VALUES(8)")?;
664 assert_current_sum(15, &sp3)?;
665 sp3.commit()?;
666 // committed sp3, but will be erased by sp2 rollback
667 }
668 assert_current_sum(15, &sp2)?;
669 }
670 assert_current_sum(3, &sp1)?;
671 }
672 assert_current_sum(1, &tx)?;
673 }
674 assert_current_sum(1, &db)?;
675 Ok(())
676 }
677
678 #[test]
679 fn test_ignore_drop_behavior() -> Result<()> {
680 let mut db = checked_memory_handle()?;
681
682 let mut tx = db.transaction()?;
683 {
684 let mut sp1 = tx.savepoint()?;
685 insert(1, &sp1)?;
686 sp1.rollback()?;
687 insert(2, &sp1)?;
688 {
689 let mut sp2 = sp1.savepoint()?;
690 sp2.set_drop_behavior(DropBehavior::Ignore);
691 insert(4, &sp2)?;
692 }
693 assert_current_sum(6, &sp1)?;
694 sp1.commit()?;
695 }
696 assert_current_sum(6, &tx)?;
697 Ok(())
698 }
699
700 #[test]
701 fn test_savepoint_drop_behavior_releases() -> Result<()> {
702 let mut db = checked_memory_handle()?;
703
704 {
705 let mut sp = db.savepoint()?;
706 sp.set_drop_behavior(DropBehavior::Commit);
707 }
708 assert!(db.is_autocommit());
709 {
710 let mut sp = db.savepoint()?;
711 sp.set_drop_behavior(DropBehavior::Rollback);
712 }
713 assert!(db.is_autocommit());
714
715 Ok(())
716 }
717
718 #[test]
719 fn test_savepoint_release_error() -> Result<()> {
720 let mut db = checked_memory_handle()?;
721
722 db.pragma_update(None, "foreign_keys", true)?;
723 db.execute_batch("CREATE TABLE r(n INTEGER PRIMARY KEY NOT NULL); CREATE TABLE f(n REFERENCES r(n) DEFERRABLE INITIALLY DEFERRED);")?;
724 {
725 let mut sp = db.savepoint()?;
726 sp.execute("INSERT INTO f VALUES (0)", [])?;
727 sp.set_drop_behavior(DropBehavior::Commit);
728 }
729 assert!(db.is_autocommit());
730
731 Ok(())
732 }
733
734 #[test]
735 fn test_savepoint_names() -> Result<()> {
736 let mut db = checked_memory_handle()?;
737
738 {
739 let mut sp1 = db.savepoint_with_name("my_sp")?;
740 insert(1, &sp1)?;
741 assert_current_sum(1, &sp1)?;
742 {
743 let mut sp2 = sp1.savepoint_with_name("my_sp")?;
744 sp2.set_drop_behavior(DropBehavior::Commit);
745 insert(2, &sp2)?;
746 assert_current_sum(3, &sp2)?;
747 sp2.rollback()?;
748 assert_current_sum(1, &sp2)?;
749 insert(4, &sp2)?;
750 }
751 assert_current_sum(5, &sp1)?;
752 sp1.rollback()?;
753 {
754 let mut sp2 = sp1.savepoint_with_name("my_sp")?;
755 sp2.set_drop_behavior(DropBehavior::Ignore);
756 insert(8, &sp2)?;
757 }
758 assert_current_sum(8, &sp1)?;
759 sp1.commit()?;
760 }
761 assert_current_sum(8, &db)?;
762 Ok(())
763 }
764
765 #[test]
766 fn test_rc() -> Result<()> {
767 use std::rc::Rc;
768 let mut conn = Connection::open_in_memory()?;
769 let rc_txn = Rc::new(conn.transaction()?);
770
771 // This will compile only if Transaction is Debug
772 Rc::try_unwrap(rc_txn).unwrap();
773 Ok(())
774 }
775
776 fn insert(x: i32, conn: &Connection) -> Result<usize> {
777 conn.execute("INSERT INTO foo VALUES(?1)", [x])
778 }
779
780 fn assert_current_sum(x: i32, conn: &Connection) -> Result<()> {
781 let i = conn.one_column::<i32>("SELECT SUM(x) FROM foo")?;
782 assert_eq!(x, i);
783 Ok(())
784 }
785
786 #[test]
787 #[cfg(feature = "modern_sqlite")]
788 fn txn_state() -> Result<()> {
789 use super::TransactionState;
790 use crate::DatabaseName;
791 let db = Connection::open_in_memory()?;
792 assert_eq!(
793 TransactionState::None,
794 db.transaction_state(Some(DatabaseName::Main))?
795 );
796 assert_eq!(TransactionState::None, db.transaction_state(None)?);
797 db.execute_batch("BEGIN")?;
798 assert_eq!(TransactionState::None, db.transaction_state(None)?);
799 let _: i32 = db.pragma_query_value(None, "user_version", |row| row.get(0))?;
800 assert_eq!(TransactionState::Read, db.transaction_state(None)?);
801 db.pragma_update(None, "user_version", 1)?;
802 assert_eq!(TransactionState::Write, db.transaction_state(None)?);
803 db.execute_batch("ROLLBACK")?;
804 Ok(())
805 }
806
807 #[test]
808 #[cfg(feature = "modern_sqlite")]
809 fn auto_commit() -> Result<()> {
810 use super::TransactionState;
811 let db = Connection::open_in_memory()?;
812 db.execute_batch("CREATE TABLE t(i UNIQUE);")?;
813 assert!(db.is_autocommit());
814 let mut stmt = db.prepare("SELECT name FROM sqlite_master")?;
815 assert_eq!(TransactionState::None, db.transaction_state(None)?);
816 {
817 let mut rows = stmt.query([])?;
818 assert!(rows.next()?.is_some()); // start reading
819 assert_eq!(TransactionState::Read, db.transaction_state(None)?);
820 db.execute("INSERT INTO t VALUES (1)", [])?; // auto-commit
821 assert_eq!(TransactionState::Read, db.transaction_state(None)?);
822 assert!(rows.next()?.is_some()); // still reading
823 assert_eq!(TransactionState::Read, db.transaction_state(None)?);
824 assert!(rows.next()?.is_none()); // end
825 assert_eq!(TransactionState::None, db.transaction_state(None)?);
826 }
827 Ok(())
828 }
829}