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2e07650a02
https://sqlite.org/lang_expr.html#parameters > But because it is easy to miscount the question marks, the use of this parameter format is discouraged. Programmers are encouraged to use one of the symbolic formats below or the ?NNN format above instead.
751 lines
23 KiB
Rust
751 lines
23 KiB
Rust
use crate::{Connection, Result};
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use std::ops::Deref;
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/// Options for transaction behavior. See [BEGIN
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/// TRANSACTION](http://www.sqlite.org/lang_transaction.html) for details.
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#[derive(Copy, Clone)]
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#[non_exhaustive]
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pub enum TransactionBehavior {
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/// DEFERRED means that the transaction does not actually start until the
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/// database is first accessed.
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Deferred,
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/// IMMEDIATE cause the database connection to start a new write
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/// immediately, without waiting for a writes statement.
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Immediate,
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/// EXCLUSIVE prevents other database connections from reading the database
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/// while the transaction is underway.
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Exclusive,
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}
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/// Options for how a Transaction or Savepoint should behave when it is dropped.
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#[derive(Copy, Clone, Debug, PartialEq, Eq)]
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#[non_exhaustive]
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pub enum DropBehavior {
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/// Roll back the changes. This is the default.
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Rollback,
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/// Commit the changes.
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Commit,
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/// Do not commit or roll back changes - this will leave the transaction or
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/// savepoint open, so should be used with care.
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Ignore,
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/// Panic. Used to enforce intentional behavior during development.
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Panic,
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}
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/// Represents a transaction on a database connection.
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///
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/// ## Note
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///
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/// Transactions will roll back by default. Use `commit` method to explicitly
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/// commit the transaction, or use `set_drop_behavior` to change what happens
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/// when the transaction is dropped.
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///
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/// ## Example
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///
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/// ```rust,no_run
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/// # use rusqlite::{Connection, Result};
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/// # fn do_queries_part_1(_conn: &Connection) -> Result<()> { Ok(()) }
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/// # fn do_queries_part_2(_conn: &Connection) -> Result<()> { Ok(()) }
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/// fn perform_queries(conn: &mut Connection) -> Result<()> {
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/// let tx = conn.transaction()?;
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///
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/// do_queries_part_1(&tx)?; // tx causes rollback if this fails
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/// do_queries_part_2(&tx)?; // tx causes rollback if this fails
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///
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/// tx.commit()
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/// }
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/// ```
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#[derive(Debug)]
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pub struct Transaction<'conn> {
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conn: &'conn Connection,
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drop_behavior: DropBehavior,
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}
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/// Represents a savepoint on a database connection.
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///
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/// ## Note
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///
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/// Savepoints will roll back by default. Use `commit` method to explicitly
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/// commit the savepoint, or use `set_drop_behavior` to change what happens
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/// when the savepoint is dropped.
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///
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/// ## Example
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///
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/// ```rust,no_run
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/// # use rusqlite::{Connection, Result};
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/// # fn do_queries_part_1(_conn: &Connection) -> Result<()> { Ok(()) }
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/// # fn do_queries_part_2(_conn: &Connection) -> Result<()> { Ok(()) }
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/// fn perform_queries(conn: &mut Connection) -> Result<()> {
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/// let sp = conn.savepoint()?;
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///
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/// do_queries_part_1(&sp)?; // sp causes rollback if this fails
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/// do_queries_part_2(&sp)?; // sp causes rollback if this fails
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///
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/// sp.commit()
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/// }
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/// ```
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#[derive(Debug)]
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pub struct Savepoint<'conn> {
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conn: &'conn Connection,
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name: String,
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depth: u32,
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drop_behavior: DropBehavior,
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committed: bool,
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}
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impl Transaction<'_> {
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/// Begin a new transaction. Cannot be nested; see `savepoint` for nested
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/// transactions.
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///
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/// Even though we don't mutate the connection, we take a `&mut Connection`
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/// so as to prevent nested transactions on the same connection. For cases
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/// where this is unacceptable, [`Transaction::new_unchecked`] is available.
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#[inline]
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pub fn new(conn: &mut Connection, behavior: TransactionBehavior) -> Result<Transaction<'_>> {
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Self::new_unchecked(conn, behavior)
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}
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/// Begin a new transaction, failing if a transaction is open.
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///
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/// If a transaction is already open, this will return an error. Where
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/// possible, [`Transaction::new`] should be preferred, as it provides a
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/// compile-time guarantee that transactions are not nested.
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#[inline]
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pub fn new_unchecked(
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conn: &Connection,
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behavior: TransactionBehavior,
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) -> Result<Transaction<'_>> {
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let query = match behavior {
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TransactionBehavior::Deferred => "BEGIN DEFERRED",
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TransactionBehavior::Immediate => "BEGIN IMMEDIATE",
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TransactionBehavior::Exclusive => "BEGIN EXCLUSIVE",
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};
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conn.execute_batch(query).map(move |_| Transaction {
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conn,
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drop_behavior: DropBehavior::Rollback,
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})
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}
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/// Starts a new [savepoint](http://www.sqlite.org/lang_savepoint.html), allowing nested
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/// transactions.
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///
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/// ## Note
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///
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/// Just like outer level transactions, savepoint transactions rollback by
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/// default.
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///
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/// ## Example
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///
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/// ```rust,no_run
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/// # use rusqlite::{Connection, Result};
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/// # fn perform_queries_part_1_succeeds(_conn: &Connection) -> bool { true }
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/// fn perform_queries(conn: &mut Connection) -> Result<()> {
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/// let mut tx = conn.transaction()?;
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///
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/// {
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/// let sp = tx.savepoint()?;
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/// if perform_queries_part_1_succeeds(&sp) {
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/// sp.commit()?;
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/// }
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/// // otherwise, sp will rollback
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/// }
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///
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/// tx.commit()
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/// }
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/// ```
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#[inline]
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pub fn savepoint(&mut self) -> Result<Savepoint<'_>> {
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Savepoint::with_depth(self.conn, 1)
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}
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/// Create a new savepoint with a custom savepoint name. See `savepoint()`.
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#[inline]
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pub fn savepoint_with_name<T: Into<String>>(&mut self, name: T) -> Result<Savepoint<'_>> {
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Savepoint::with_depth_and_name(self.conn, 1, name)
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}
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/// Get the current setting for what happens to the transaction when it is
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/// dropped.
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#[inline]
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#[must_use]
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pub fn drop_behavior(&self) -> DropBehavior {
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self.drop_behavior
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}
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/// Configure the transaction to perform the specified action when it is
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/// dropped.
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#[inline]
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pub fn set_drop_behavior(&mut self, drop_behavior: DropBehavior) {
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self.drop_behavior = drop_behavior;
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}
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/// A convenience method which consumes and commits a transaction.
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#[inline]
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pub fn commit(mut self) -> Result<()> {
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self.commit_()
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}
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#[inline]
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fn commit_(&mut self) -> Result<()> {
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self.conn.execute_batch("COMMIT")?;
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Ok(())
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}
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/// A convenience method which consumes and rolls back a transaction.
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#[inline]
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pub fn rollback(mut self) -> Result<()> {
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self.rollback_()
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}
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#[inline]
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fn rollback_(&mut self) -> Result<()> {
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self.conn.execute_batch("ROLLBACK")?;
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Ok(())
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}
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/// Consumes the transaction, committing or rolling back according to the
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/// current setting (see `drop_behavior`).
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///
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/// Functionally equivalent to the `Drop` implementation, but allows
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/// callers to see any errors that occur.
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#[inline]
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pub fn finish(mut self) -> Result<()> {
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self.finish_()
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}
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#[inline]
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fn finish_(&mut self) -> Result<()> {
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if self.conn.is_autocommit() {
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return Ok(());
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}
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match self.drop_behavior() {
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DropBehavior::Commit => self.commit_().or_else(|_| self.rollback_()),
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DropBehavior::Rollback => self.rollback_(),
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DropBehavior::Ignore => Ok(()),
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DropBehavior::Panic => panic!("Transaction dropped unexpectedly."),
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}
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}
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}
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impl Deref for Transaction<'_> {
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type Target = Connection;
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#[inline]
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fn deref(&self) -> &Connection {
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self.conn
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}
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}
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#[allow(unused_must_use)]
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impl Drop for Transaction<'_> {
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#[inline]
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fn drop(&mut self) {
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self.finish_();
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}
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}
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impl Savepoint<'_> {
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#[inline]
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fn with_depth_and_name<T: Into<String>>(
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conn: &Connection,
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depth: u32,
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name: T,
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) -> Result<Savepoint<'_>> {
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let name = name.into();
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conn.execute_batch(&format!("SAVEPOINT {name}"))
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.map(|_| Savepoint {
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conn,
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name,
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depth,
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drop_behavior: DropBehavior::Rollback,
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committed: false,
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})
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}
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#[inline]
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fn with_depth(conn: &Connection, depth: u32) -> Result<Savepoint<'_>> {
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let name = format!("_rusqlite_sp_{depth}");
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Savepoint::with_depth_and_name(conn, depth, name)
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}
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/// Begin a new savepoint. Can be nested.
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#[inline]
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pub fn new(conn: &mut Connection) -> Result<Savepoint<'_>> {
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Savepoint::with_depth(conn, 0)
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}
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/// Begin a new savepoint with a user-provided savepoint name.
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#[inline]
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pub fn with_name<T: Into<String>>(conn: &mut Connection, name: T) -> Result<Savepoint<'_>> {
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Savepoint::with_depth_and_name(conn, 0, name)
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}
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/// Begin a nested savepoint.
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#[inline]
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pub fn savepoint(&mut self) -> Result<Savepoint<'_>> {
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Savepoint::with_depth(self.conn, self.depth + 1)
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}
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/// Begin a nested savepoint with a user-provided savepoint name.
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#[inline]
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pub fn savepoint_with_name<T: Into<String>>(&mut self, name: T) -> Result<Savepoint<'_>> {
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Savepoint::with_depth_and_name(self.conn, self.depth + 1, name)
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}
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/// Get the current setting for what happens to the savepoint when it is
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/// dropped.
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#[inline]
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#[must_use]
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pub fn drop_behavior(&self) -> DropBehavior {
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self.drop_behavior
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}
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/// Configure the savepoint to perform the specified action when it is
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/// dropped.
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#[inline]
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pub fn set_drop_behavior(&mut self, drop_behavior: DropBehavior) {
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self.drop_behavior = drop_behavior;
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}
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/// A convenience method which consumes and commits a savepoint.
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#[inline]
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pub fn commit(mut self) -> Result<()> {
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self.commit_()
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}
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#[inline]
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fn commit_(&mut self) -> Result<()> {
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self.conn.execute_batch(&format!("RELEASE {}", self.name))?;
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self.committed = true;
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Ok(())
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}
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/// A convenience method which rolls back a savepoint.
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///
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/// ## Note
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///
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/// Unlike `Transaction`s, savepoints remain active after they have been
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/// rolled back, and can be rolled back again or committed.
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#[inline]
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pub fn rollback(&mut self) -> Result<()> {
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self.conn
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.execute_batch(&format!("ROLLBACK TO {}", self.name))
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}
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/// Consumes the savepoint, committing or rolling back according to the
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/// current setting (see `drop_behavior`).
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///
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/// Functionally equivalent to the `Drop` implementation, but allows
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/// callers to see any errors that occur.
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#[inline]
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pub fn finish(mut self) -> Result<()> {
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self.finish_()
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}
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#[inline]
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fn finish_(&mut self) -> Result<()> {
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if self.committed {
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return Ok(());
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}
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match self.drop_behavior() {
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DropBehavior::Commit => self.commit_().or_else(|_| self.rollback()),
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DropBehavior::Rollback => self.rollback(),
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DropBehavior::Ignore => Ok(()),
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DropBehavior::Panic => panic!("Savepoint dropped unexpectedly."),
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}
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}
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}
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impl Deref for Savepoint<'_> {
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type Target = Connection;
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#[inline]
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fn deref(&self) -> &Connection {
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self.conn
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}
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}
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#[allow(unused_must_use)]
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impl Drop for Savepoint<'_> {
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#[inline]
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fn drop(&mut self) {
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self.finish_();
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}
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}
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/// Transaction state of a database
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#[derive(Clone, Copy, Debug, PartialEq, Eq)]
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#[non_exhaustive]
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#[cfg(feature = "modern_sqlite")] // 3.37.0
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#[cfg_attr(docsrs, doc(cfg(feature = "modern_sqlite")))]
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pub enum TransactionState {
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/// Equivalent to SQLITE_TXN_NONE
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None,
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/// Equivalent to SQLITE_TXN_READ
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Read,
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/// Equivalent to SQLITE_TXN_WRITE
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Write,
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}
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impl Connection {
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/// Begin a new transaction with the default behavior (DEFERRED).
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///
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/// The transaction defaults to rolling back when it is dropped. If you
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/// want the transaction to commit, you must call
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/// [`commit`](Transaction::commit) or
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/// [`set_drop_behavior(DropBehavior::Commit)`](Transaction::set_drop_behavior).
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///
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/// ## Example
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///
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/// ```rust,no_run
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/// # use rusqlite::{Connection, Result};
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/// # fn do_queries_part_1(_conn: &Connection) -> Result<()> { Ok(()) }
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/// # fn do_queries_part_2(_conn: &Connection) -> Result<()> { Ok(()) }
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/// fn perform_queries(conn: &mut Connection) -> Result<()> {
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/// let tx = conn.transaction()?;
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///
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/// do_queries_part_1(&tx)?; // tx causes rollback if this fails
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/// do_queries_part_2(&tx)?; // tx causes rollback if this fails
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///
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/// tx.commit()
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/// }
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/// ```
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///
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/// # Failure
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///
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/// Will return `Err` if the underlying SQLite call fails.
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#[inline]
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pub fn transaction(&mut self) -> Result<Transaction<'_>> {
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Transaction::new(self, TransactionBehavior::Deferred)
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}
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/// Begin a new transaction with a specified behavior.
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///
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/// See [`transaction`](Connection::transaction).
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///
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/// # Failure
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///
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/// Will return `Err` if the underlying SQLite call fails.
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#[inline]
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pub fn transaction_with_behavior(
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&mut self,
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behavior: TransactionBehavior,
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) -> Result<Transaction<'_>> {
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Transaction::new(self, behavior)
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}
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/// Begin a new transaction with the default behavior (DEFERRED).
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///
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/// Attempt to open a nested transaction will result in a SQLite error.
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/// `Connection::transaction` prevents this at compile time by taking `&mut
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/// self`, but `Connection::unchecked_transaction()` may be used to defer
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/// the checking until runtime.
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///
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/// See [`Connection::transaction`] and [`Transaction::new_unchecked`]
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/// (which can be used if the default transaction behavior is undesirable).
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///
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/// ## Example
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///
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/// ```rust,no_run
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/// # use rusqlite::{Connection, Result};
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/// # use std::rc::Rc;
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/// # fn do_queries_part_1(_conn: &Connection) -> Result<()> { Ok(()) }
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/// # fn do_queries_part_2(_conn: &Connection) -> Result<()> { Ok(()) }
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/// fn perform_queries(conn: Rc<Connection>) -> Result<()> {
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/// let tx = conn.unchecked_transaction()?;
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///
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/// do_queries_part_1(&tx)?; // tx causes rollback if this fails
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/// do_queries_part_2(&tx)?; // tx causes rollback if this fails
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///
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/// tx.commit()
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/// }
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/// ```
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///
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/// # Failure
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///
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/// Will return `Err` if the underlying SQLite call fails. The specific
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/// error returned if transactions are nested is currently unspecified.
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pub fn unchecked_transaction(&self) -> Result<Transaction<'_>> {
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Transaction::new_unchecked(self, TransactionBehavior::Deferred)
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}
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/// Begin a new savepoint with the default behavior (DEFERRED).
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///
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/// The savepoint defaults to rolling back when it is dropped. If you want
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/// the savepoint to commit, you must call [`commit`](Savepoint::commit) or
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/// [`set_drop_behavior(DropBehavior::Commit)`](Savepoint::
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/// set_drop_behavior).
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///
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/// ## Example
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///
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/// ```rust,no_run
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/// # use rusqlite::{Connection, Result};
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/// # fn do_queries_part_1(_conn: &Connection) -> Result<()> { Ok(()) }
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/// # fn do_queries_part_2(_conn: &Connection) -> Result<()> { Ok(()) }
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/// fn perform_queries(conn: &mut Connection) -> Result<()> {
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/// let sp = conn.savepoint()?;
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///
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/// do_queries_part_1(&sp)?; // sp causes rollback if this fails
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/// do_queries_part_2(&sp)?; // sp causes rollback if this fails
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///
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/// sp.commit()
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/// }
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/// ```
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///
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/// # Failure
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///
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/// Will return `Err` if the underlying SQLite call fails.
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#[inline]
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pub fn savepoint(&mut self) -> Result<Savepoint<'_>> {
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Savepoint::new(self)
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}
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|
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/// Begin a new savepoint with a specified name.
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///
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/// See [`savepoint`](Connection::savepoint).
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///
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/// # Failure
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///
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/// Will return `Err` if the underlying SQLite call fails.
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#[inline]
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pub fn savepoint_with_name<T: Into<String>>(&mut self, name: T) -> Result<Savepoint<'_>> {
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Savepoint::with_name(self, name)
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}
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|
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/// Determine the transaction state of a database
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#[cfg(feature = "modern_sqlite")] // 3.37.0
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#[cfg_attr(docsrs, doc(cfg(feature = "modern_sqlite")))]
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pub fn transaction_state(
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&self,
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db_name: Option<crate::DatabaseName<'_>>,
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) -> Result<TransactionState> {
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self.db.borrow().txn_state(db_name)
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}
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}
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#[cfg(test)]
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mod test {
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use super::DropBehavior;
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use crate::{Connection, Error, Result};
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fn checked_memory_handle() -> Result<Connection> {
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let db = Connection::open_in_memory()?;
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db.execute_batch("CREATE TABLE foo (x INTEGER)")?;
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Ok(db)
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}
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#[test]
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fn test_drop() -> Result<()> {
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let mut db = checked_memory_handle()?;
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{
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let tx = db.transaction()?;
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tx.execute_batch("INSERT INTO foo VALUES(1)")?;
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// default: rollback
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}
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{
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let mut tx = db.transaction()?;
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tx.execute_batch("INSERT INTO foo VALUES(2)")?;
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tx.set_drop_behavior(DropBehavior::Commit)
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}
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{
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let tx = db.transaction()?;
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assert_eq!(2i32, tx.one_column::<i32>("SELECT SUM(x) FROM foo")?);
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}
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Ok(())
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}
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fn assert_nested_tx_error(e: Error) {
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if let Error::SqliteFailure(e, Some(m)) = &e {
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assert_eq!(e.extended_code, crate::ffi::SQLITE_ERROR);
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// FIXME: Not ideal...
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assert_eq!(e.code, crate::ErrorCode::Unknown);
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assert!(m.contains("transaction"));
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} else {
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panic!("Unexpected error type: {:?}", e);
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}
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}
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#[test]
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fn test_unchecked_nesting() -> Result<()> {
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let db = checked_memory_handle()?;
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{
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let tx = db.unchecked_transaction()?;
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let e = tx.unchecked_transaction().unwrap_err();
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assert_nested_tx_error(e);
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// default: rollback
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}
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{
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let tx = db.unchecked_transaction()?;
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tx.execute_batch("INSERT INTO foo VALUES(1)")?;
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// Ensure this doesn't interfere with ongoing transaction
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let e = tx.unchecked_transaction().unwrap_err();
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assert_nested_tx_error(e);
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tx.execute_batch("INSERT INTO foo VALUES(1)")?;
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tx.commit()?;
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}
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assert_eq!(2i32, db.one_column::<i32>("SELECT SUM(x) FROM foo")?);
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Ok(())
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}
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#[test]
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fn test_explicit_rollback_commit() -> Result<()> {
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let mut db = checked_memory_handle()?;
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{
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let mut tx = db.transaction()?;
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{
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let mut sp = tx.savepoint()?;
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sp.execute_batch("INSERT INTO foo VALUES(1)")?;
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sp.rollback()?;
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sp.execute_batch("INSERT INTO foo VALUES(2)")?;
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sp.commit()?;
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}
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tx.commit()?;
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}
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{
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let tx = db.transaction()?;
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tx.execute_batch("INSERT INTO foo VALUES(4)")?;
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tx.commit()?;
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}
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{
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let tx = db.transaction()?;
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assert_eq!(6i32, tx.one_column::<i32>("SELECT SUM(x) FROM foo")?);
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}
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Ok(())
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}
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#[test]
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fn test_savepoint() -> Result<()> {
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let mut db = checked_memory_handle()?;
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{
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let mut tx = db.transaction()?;
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tx.execute_batch("INSERT INTO foo VALUES(1)")?;
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assert_current_sum(1, &tx)?;
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tx.set_drop_behavior(DropBehavior::Commit);
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{
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let mut sp1 = tx.savepoint()?;
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sp1.execute_batch("INSERT INTO foo VALUES(2)")?;
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assert_current_sum(3, &sp1)?;
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// will rollback sp1
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{
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let mut sp2 = sp1.savepoint()?;
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sp2.execute_batch("INSERT INTO foo VALUES(4)")?;
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assert_current_sum(7, &sp2)?;
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// will rollback sp2
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{
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let sp3 = sp2.savepoint()?;
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sp3.execute_batch("INSERT INTO foo VALUES(8)")?;
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assert_current_sum(15, &sp3)?;
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sp3.commit()?;
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// committed sp3, but will be erased by sp2 rollback
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}
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assert_current_sum(15, &sp2)?;
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}
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assert_current_sum(3, &sp1)?;
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}
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assert_current_sum(1, &tx)?;
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}
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assert_current_sum(1, &db)?;
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Ok(())
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}
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#[test]
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fn test_ignore_drop_behavior() -> Result<()> {
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let mut db = checked_memory_handle()?;
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let mut tx = db.transaction()?;
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{
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let mut sp1 = tx.savepoint()?;
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insert(1, &sp1)?;
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sp1.rollback()?;
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insert(2, &sp1)?;
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{
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let mut sp2 = sp1.savepoint()?;
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sp2.set_drop_behavior(DropBehavior::Ignore);
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insert(4, &sp2)?;
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}
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assert_current_sum(6, &sp1)?;
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sp1.commit()?;
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}
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assert_current_sum(6, &tx)?;
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Ok(())
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}
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#[test]
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fn test_savepoint_names() -> Result<()> {
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let mut db = checked_memory_handle()?;
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{
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let mut sp1 = db.savepoint_with_name("my_sp")?;
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insert(1, &sp1)?;
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assert_current_sum(1, &sp1)?;
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{
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let mut sp2 = sp1.savepoint_with_name("my_sp")?;
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sp2.set_drop_behavior(DropBehavior::Commit);
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insert(2, &sp2)?;
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assert_current_sum(3, &sp2)?;
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sp2.rollback()?;
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assert_current_sum(1, &sp2)?;
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insert(4, &sp2)?;
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}
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assert_current_sum(5, &sp1)?;
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sp1.rollback()?;
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{
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let mut sp2 = sp1.savepoint_with_name("my_sp")?;
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sp2.set_drop_behavior(DropBehavior::Ignore);
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insert(8, &sp2)?;
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}
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assert_current_sum(8, &sp1)?;
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sp1.commit()?;
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}
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assert_current_sum(8, &db)?;
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Ok(())
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}
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#[test]
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fn test_rc() -> Result<()> {
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use std::rc::Rc;
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let mut conn = Connection::open_in_memory()?;
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let rc_txn = Rc::new(conn.transaction()?);
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// This will compile only if Transaction is Debug
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Rc::try_unwrap(rc_txn).unwrap();
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Ok(())
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}
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fn insert(x: i32, conn: &Connection) -> Result<usize> {
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conn.execute("INSERT INTO foo VALUES(?1)", [x])
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}
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fn assert_current_sum(x: i32, conn: &Connection) -> Result<()> {
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let i = conn.one_column::<i32>("SELECT SUM(x) FROM foo")?;
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assert_eq!(x, i);
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Ok(())
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}
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#[test]
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#[cfg(feature = "modern_sqlite")]
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fn txn_state() -> Result<()> {
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use super::TransactionState;
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use crate::DatabaseName;
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let db = Connection::open_in_memory()?;
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assert_eq!(
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TransactionState::None,
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db.transaction_state(Some(DatabaseName::Main))?
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);
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assert_eq!(TransactionState::None, db.transaction_state(None)?);
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db.execute_batch("BEGIN")?;
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assert_eq!(TransactionState::None, db.transaction_state(None)?);
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let _: i32 = db.pragma_query_value(None, "user_version", |row| row.get(0))?;
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assert_eq!(TransactionState::Read, db.transaction_state(None)?);
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db.pragma_update(None, "user_version", 1)?;
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assert_eq!(TransactionState::Write, db.transaction_state(None)?);
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db.execute_batch("ROLLBACK")?;
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Ok(())
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}
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}
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