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Merge branch 'master' into remove-rows-iterator-impl

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This commit is contained in:
John Gallagher 2016-05-19 14:06:56 -05:00
commit d608956bd0
10 changed files with 762 additions and 161 deletions
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4
.travis.yml
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@ -1,10 +1,6 @@
language: rust
sudo: false
env:
global:
secure: "FyGzHF0AIYdBcuM/2qIoABotx3MbNAlaHDzxPbbeUlVg64bnuib9G9K/qWve0a1BWCgv+8e/SbXZb7gt3JlUNE27aE4RZG4FEdtEpLYQp87Dc9d9HX0FwpUeFK3binsrtYl4WEBnIjQ3ICnUVey0E6GHEdkM+t5bWyJO5c4dJ30="
script:
- cargo build
- cargo test

1
Cargo.toml
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@ -22,6 +22,7 @@ trace = []
[dependencies]
time = "~0.1.0"
bitflags = "0.7"
lru-cache = "0.0.7"
libc = "~0.2"
clippy = {version = "~0.0.58", optional = true}
chrono = { version = "~0.2", optional = true }

9
Changelog.md
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@ -7,11 +7,20 @@
hazard related to the lack of these lifetime connections. We were already recommending the
use of `query_map` and `query_and_then` over raw `query`; both of theose still return handles
that implement `Iterator`.
* BREAKING CHANGE: `Transaction::savepoint()` now returns a `Savepoint` instead of another
`Transaction`. Unlike `Transaction`, `Savepoint`s can be rolled back while keeping the current
savepoint active.
* BREAKING CHANGE: Creating transactions from a `Connection` or savepoints from a `Transaction`
now take `&mut self` instead of `&self` to correctly represent that transactions within a
connection are inherently nested. While a transaction is alive, the parent connection or
transaction is unusable, so `Transaction` now implements `Deref<Target=Connection>`, giving
access to `Connection`'s methods via the `Transaction` itself.
* BREAKING CHANGE: `Transaction::set_commit` and `Transaction::set_rollback` have been replaced
by `Transaction::set_drop_behavior`.
* Adds `Connection::prepare_cached`. `Connection` now keeps an internal cache of any statements
prepared via this method. The size of this cache defaults to 16 (`prepare_cached` will always
work but may re-prepare statements if more are prepared than the cache holds), and can be
controlled via `Connection::set_prepared_statement_cache_capacity`.
* Adds `query_map_named` and `query_and_then_named` to `Statement`.
* Adds `insert` convenience method to `Statement` which returns the row ID of an inserted row.
* Adds `exists` convenience method returning whether a query finds one or more rows.

23
benches/lib.rs Normal file
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@ -0,0 +1,23 @@
#![feature(test)]
extern crate test;
extern crate rusqlite;
use rusqlite::Connection;
use rusqlite::cache::StatementCache;
use test::Bencher;
#[bench]
fn bench_no_cache(b: &mut Bencher) {
let db = Connection::open_in_memory().unwrap();
let sql = "SELECT 1, 'test', 3.14 UNION SELECT 2, 'exp', 2.71";
b.iter(|| db.prepare(sql).unwrap());
}
#[bench]
fn bench_cache(b: &mut Bencher) {
let db = Connection::open_in_memory().unwrap();
let cache = StatementCache::new(&db, 15);
let sql = "SELECT 1, 'test', 3.14 UNION SELECT 2, 'exp', 2.71";
b.iter(|| cache.get(sql).unwrap());
}

2
publish-ghp-docs.sh
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@ -8,7 +8,7 @@ fi
cd $(git rev-parse --show-toplevel)
rm -rf target/doc/
multirust run nightly cargo doc --no-deps --features "load_extension trace"
multirust run nightly cargo doc --no-deps --features "backup cache functions load_extension trace blob"
echo '<meta http-equiv=refresh content=0;url=rusqlite/index.html>' > target/doc/index.html
ghp-import target/doc
git push origin gh-pages:gh-pages

269
src/cache.rs Normal file
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@ -0,0 +1,269 @@
//! Prepared statements cache for faster execution.
use std::cell::RefCell;
use std::ops::{Deref, DerefMut};
use lru_cache::LruCache;
use {Result, Connection, Statement};
use raw_statement::RawStatement;
impl Connection {
/// Prepare a SQL statement for execution, returning a previously prepared (but
/// not currently in-use) statement if one is available. The returned statement
/// will be cached for reuse by future calls to `prepare_cached` once it is
/// dropped.
///
/// ```rust,no_run
/// # use rusqlite::{Connection, Result};
/// fn insert_new_people(conn: &Connection) -> Result<()> {
/// {
/// let mut stmt = try!(conn.prepare_cached("INSERT INTO People (name) VALUES (?)"));
/// try!(stmt.execute(&[&"Joe Smith"]));
/// }
/// {
/// // This will return the same underlying SQLite statement handle without
/// // having to prepare it again.
/// let mut stmt = try!(conn.prepare_cached("INSERT INTO People (name) VALUES (?)"));
/// try!(stmt.execute(&[&"Bob Jones"]));
/// }
/// Ok(())
/// }
/// ```
///
/// # Failure
///
/// Will return `Err` if `sql` cannot be converted to a C-compatible string or if the
/// underlying SQLite call fails.
pub fn prepare_cached<'a>(&'a self, sql: &str) -> Result<CachedStatement<'a>> {
self.cache.get(&self, sql)
}
/// Set the maximum number of cached prepared statements this connection will hold.
/// By default, a connection will hold a relatively small number of cached statements.
/// If you need more, or know that you will not use cached statements, you can set
/// the capacity manually using this method.
pub fn set_prepared_statement_cache_capacity(&self, capacity: usize) {
self.cache.set_capacity(capacity)
}
}
/// Prepared statements LRU cache.
#[derive(Debug)]
pub struct StatementCache(RefCell<LruCache<String, RawStatement>>);
/// Cacheable statement.
///
/// Statement will return automatically to the cache by default.
/// If you want the statement to be discarded, call `discard()` on it.
pub struct CachedStatement<'conn> {
stmt: Option<Statement<'conn>>,
cache: &'conn StatementCache,
}
impl<'conn> Deref for CachedStatement<'conn> {
type Target = Statement<'conn>;
fn deref(&self) -> &Statement<'conn> {
self.stmt.as_ref().unwrap()
}
}
impl<'conn> DerefMut for CachedStatement<'conn> {
fn deref_mut(&mut self) -> &mut Statement<'conn> {
self.stmt.as_mut().unwrap()
}
}
impl<'conn> Drop for CachedStatement<'conn> {
#[allow(unused_must_use)]
fn drop(&mut self) {
if let Some(stmt) = self.stmt.take() {
self.cache.cache_stmt(stmt.into());
}
}
}
impl<'conn> CachedStatement<'conn> {
fn new(stmt: Statement<'conn>, cache: &'conn StatementCache) -> CachedStatement<'conn> {
CachedStatement {
stmt: Some(stmt),
cache: cache,
}
}
pub fn discard(mut self) {
self.stmt = None;
}
}
impl StatementCache {
/// Create a statement cache.
pub fn with_capacity(capacity: usize) -> StatementCache {
StatementCache(RefCell::new(LruCache::new(capacity)))
}
fn set_capacity(&self, capacity: usize) {
self.0.borrow_mut().set_capacity(capacity)
}
// Search the cache for a prepared-statement object that implements `sql`.
// If no such prepared-statement can be found, allocate and prepare a new one.
//
// # Failure
//
// Will return `Err` if no cached statement can be found and the underlying SQLite prepare
// call fails.
fn get<'conn>(&'conn self,
conn: &'conn Connection,
sql: &str)
-> Result<CachedStatement<'conn>> {
let mut cache = self.0.borrow_mut();
let stmt = match cache.remove(sql) {
Some(raw_stmt) => Ok(Statement::new(conn, raw_stmt)),
None => conn.prepare(sql),
};
stmt.map(|stmt| CachedStatement::new(stmt, self))
}
// Return a statement to the cache.
fn cache_stmt(&self, stmt: RawStatement) {
let mut cache = self.0.borrow_mut();
stmt.clear_bindings();
let sql = String::from_utf8_lossy(stmt.sql().to_bytes()).to_string();
cache.insert(sql, stmt);
}
}
#[cfg(test)]
mod test {
use Connection;
use super::StatementCache;
impl StatementCache {
fn clear(&self) {
self.0.borrow_mut().clear();
}
fn len(&self) -> usize {
self.0.borrow().len()
}
fn capacity(&self) -> usize {
self.0.borrow().capacity()
}
}
#[test]
fn test_cache() {
let db = Connection::open_in_memory().unwrap();
let cache = &db.cache;
let initial_capacity = cache.capacity();
assert_eq!(0, cache.len());
assert!(initial_capacity > 0);
let sql = "PRAGMA schema_version";
{
let mut stmt = db.prepare_cached(sql).unwrap();
assert_eq!(0, cache.len());
assert_eq!(0,
stmt.query(&[]).unwrap().get_expected_row().unwrap().get::<i32, i64>(0));
}
assert_eq!(1, cache.len());
{
let mut stmt = db.prepare_cached(sql).unwrap();
assert_eq!(0, cache.len());
assert_eq!(0,
stmt.query(&[]).unwrap().get_expected_row().unwrap().get::<i32, i64>(0));
}
assert_eq!(1, cache.len());
cache.clear();
assert_eq!(0, cache.len());
assert_eq!(initial_capacity, cache.capacity());
}
#[test]
fn test_set_capacity() {
let db = Connection::open_in_memory().unwrap();
let cache = &db.cache;
let sql = "PRAGMA schema_version";
{
let mut stmt = db.prepare_cached(sql).unwrap();
assert_eq!(0, cache.len());
assert_eq!(0,
stmt.query(&[]).unwrap().get_expected_row().unwrap().get::<i32, i64>(0));
}
assert_eq!(1, cache.len());
db.set_prepared_statement_cache_capacity(0);
assert_eq!(0, cache.len());
{
let mut stmt = db.prepare_cached(sql).unwrap();
assert_eq!(0, cache.len());
assert_eq!(0,
stmt.query(&[]).unwrap().get_expected_row().unwrap().get::<i32, i64>(0));
}
assert_eq!(0, cache.len());
db.set_prepared_statement_cache_capacity(8);
{
let mut stmt = db.prepare_cached(sql).unwrap();
assert_eq!(0, cache.len());
assert_eq!(0,
stmt.query(&[]).unwrap().get_expected_row().unwrap().get::<i32, i64>(0));
}
assert_eq!(1, cache.len());
}
#[test]
fn test_discard() {
let db = Connection::open_in_memory().unwrap();
let cache = &db.cache;
let sql = "PRAGMA schema_version";
{
let mut stmt = db.prepare_cached(sql).unwrap();
assert_eq!(0, cache.len());
assert_eq!(0,
stmt.query(&[]).unwrap().get_expected_row().unwrap().get::<i32, i64>(0));
stmt.discard();
}
assert_eq!(0, cache.len());
}
#[test]
fn test_ddl() {
let db = Connection::open_in_memory().unwrap();
db.execute_batch(r#"
CREATE TABLE foo (x INT);
INSERT INTO foo VALUES (1);
"#)
.unwrap();
let sql = "SELECT * FROM foo";
{
let mut stmt = db.prepare_cached(sql).unwrap();
assert_eq!(1i32,
stmt.query_map(&[], |r| r.get(0)).unwrap().next().unwrap().unwrap());
}
db.execute_batch(r#"
ALTER TABLE foo ADD COLUMN y INT;
UPDATE foo SET y = 2;
"#)
.unwrap();
{
let mut stmt = db.prepare_cached(sql).unwrap();
assert_eq!((1i32, 2i32),
stmt.query_map(&[], |r| (r.get(0), r.get(1)))
.unwrap()
.next()
.unwrap()
.unwrap());
}
}
}

130
src/lib.rs
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@ -55,6 +55,7 @@
extern crate libc;
extern crate libsqlite3_sys as ffi;
extern crate lru_cache;
#[macro_use]
extern crate bitflags;
#[cfg(test)]
@ -76,24 +77,32 @@ use libc::{c_int, c_char};
use types::{ToSql, FromSql};
use error::{error_from_sqlite_code, error_from_handle};
use raw_statement::RawStatement;
use cache::StatementCache;
pub use transaction::{SqliteTransaction, Transaction, TransactionBehavior};
pub use error::{SqliteError, Error};
pub use cache::CachedStatement;
#[cfg(feature = "load_extension")]
pub use load_extension_guard::{SqliteLoadExtensionGuard, LoadExtensionGuard};
pub mod types;
mod transaction;
mod cache;
mod named_params;
mod error;
mod convenient;
mod raw_statement;
#[cfg(feature = "load_extension")]mod load_extension_guard;
#[cfg(feature = "trace")]pub mod trace;
#[cfg(feature = "backup")]pub mod backup;
#[cfg(feature = "functions")]pub mod functions;
#[cfg(feature = "blob")]pub mod blob;
// Number of cached prepared statements we'll hold on to.
const STATEMENT_CACHE_DEFAULT_CAPACITY: usize = 16;
/// Old name for `Result`. `SqliteResult` is deprecated.
pub type SqliteResult<T> = Result<T>;
@ -146,6 +155,7 @@ pub type SqliteConnection = Connection;
/// A connection to a SQLite database.
pub struct Connection {
db: RefCell<InnerConnection>,
cache: StatementCache,
path: Option<PathBuf>,
}
@ -190,6 +200,7 @@ impl Connection {
InnerConnection::open_with_flags(&c_path, flags).map(|db| {
Connection {
db: RefCell::new(db),
cache: StatementCache::with_capacity(STATEMENT_CACHE_DEFAULT_CAPACITY),
path: Some(path.as_ref().to_path_buf()),
}
})
@ -208,50 +219,12 @@ impl Connection {
InnerConnection::open_with_flags(&c_memory, flags).map(|db| {
Connection {
db: RefCell::new(db),
cache: StatementCache::with_capacity(STATEMENT_CACHE_DEFAULT_CAPACITY),
path: None,
}
})
}
/// Begin a new transaction with the default behavior (DEFERRED).
///
/// The transaction defaults to rolling back when it is dropped. If you want the transaction to
/// commit, you must call `commit` or `set_commit`.
///
/// ## Example
///
/// ```rust,no_run
/// # use rusqlite::{Connection, Result};
/// # fn do_queries_part_1(conn: &Connection) -> Result<()> { Ok(()) }
/// # fn do_queries_part_2(conn: &Connection) -> Result<()> { Ok(()) }
/// fn perform_queries(conn: &Connection) -> Result<()> {
/// let tx = try!(conn.transaction());
///
/// try!(do_queries_part_1(conn)); // tx causes rollback if this fails
/// try!(do_queries_part_2(conn)); // tx causes rollback if this fails
///
/// tx.commit()
/// }
/// ```
///
/// # Failure
///
/// Will return `Err` if the underlying SQLite call fails.
pub fn transaction(&mut self) -> Result<Transaction> {
Transaction::new(self, TransactionBehavior::Deferred)
}
/// Begin a new transaction with a specified behavior.
///
/// See `transaction`.
///
/// # Failure
///
/// Will return `Err` if the underlying SQLite call fails.
pub fn transaction_with_behavior(&mut self, behavior: TransactionBehavior) -> Result<Transaction> {
Transaction::new(self, behavior)
}
/// Convenience method to run multiple SQL statements (that cannot take any parameters).
///
/// Uses [sqlite3_exec](http://www.sqlite.org/c3ref/exec.html) under the hood.
@ -686,7 +659,7 @@ impl InnerConnection {
&mut c_stmt,
ptr::null_mut())
};
self.decode_result(r).map(|_| Statement::new(conn, c_stmt))
self.decode_result(r).map(|_| Statement::new(conn, RawStatement::new(c_stmt)))
}
fn changes(&mut self) -> c_int {
@ -707,25 +680,23 @@ pub type SqliteStatement<'conn> = Statement<'conn>;
/// A prepared statement.
pub struct Statement<'conn> {
conn: &'conn Connection,
stmt: *mut ffi::sqlite3_stmt,
column_count: c_int,
stmt: RawStatement,
}
impl<'conn> Statement<'conn> {
fn new(conn: &Connection, stmt: *mut ffi::sqlite3_stmt) -> Statement {
fn new(conn: &Connection, stmt: RawStatement) -> Statement {
Statement {
conn: conn,
stmt: stmt,
column_count: unsafe { ffi::sqlite3_column_count(stmt) },
}
}
/// Get all the column names in the result set of the prepared statement.
pub fn column_names(&self) -> Vec<&str> {
let n = self.column_count;
let n = self.column_count();
let mut cols = Vec::with_capacity(n as usize);
for i in 0..n {
let slice = unsafe { CStr::from_ptr(ffi::sqlite3_column_name(self.stmt, i)) };
let slice = self.stmt.column_name(i);
let s = str::from_utf8(slice.to_bytes()).unwrap();
cols.push(s);
}
@ -734,7 +705,7 @@ impl<'conn> Statement<'conn> {
/// Return the number of columns in the result set returned by the prepared statement.
pub fn column_count(&self) -> i32 {
self.column_count
self.stmt.column_count()
}
/// Returns the column index in the result set for a given column name.
@ -744,10 +715,9 @@ impl<'conn> Statement<'conn> {
/// Will return an `Error::InvalidColumnName` when there is no column with the specified `name`.
pub fn column_index(&self, name: &str) -> Result<i32> {
let bytes = name.as_bytes();
let n = self.column_count;
let n = self.column_count();
for i in 0..n {
let slice = unsafe { CStr::from_ptr(ffi::sqlite3_column_name(self.stmt, i)) };
if bytes == slice.to_bytes() {
if bytes == self.stmt.column_name(i).to_bytes() {
return Ok(i);
}
}
@ -778,18 +748,16 @@ impl<'conn> Statement<'conn> {
/// Will return `Err` if binding parameters fails, the executed statement returns rows (in
/// which case `query` should be used instead), or the underling SQLite call fails.
pub fn execute(&mut self, params: &[&ToSql]) -> Result<c_int> {
unsafe {
try!(self.bind_parameters(params));
self.execute_()
}
try!(self.bind_parameters(params));
self.execute_()
}
unsafe fn execute_(&mut self) -> Result<c_int> {
let r = ffi::sqlite3_step(self.stmt);
ffi::sqlite3_reset(self.stmt);
fn execute_(&mut self) -> Result<c_int> {
let r = self.stmt.step();
self.stmt.reset();
match r {
ffi::SQLITE_DONE => {
if self.column_count == 0 {
if self.column_count() == 0 {
Ok(self.conn.changes())
} else {
Err(Error::ExecuteReturnedResults)
@ -828,10 +796,7 @@ impl<'conn> Statement<'conn> {
///
/// Will return `Err` if binding parameters fails.
pub fn query<'a>(&'a mut self, params: &[&ToSql]) -> Result<Rows<'a>> {
unsafe {
try!(self.bind_parameters(params));
}
try!(self.bind_parameters(params));
Ok(Rows::new(self))
}
@ -903,32 +868,39 @@ impl<'conn> Statement<'conn> {
self.finalize_()
}
unsafe fn bind_parameters(&mut self, params: &[&ToSql]) -> Result<()> {
assert!(params.len() as c_int == ffi::sqlite3_bind_parameter_count(self.stmt),
fn bind_parameters(&mut self, params: &[&ToSql]) -> Result<()> {
assert!(params.len() as c_int == self.stmt.bind_parameter_count(),
"incorrect number of parameters to query(): expected {}, got {}",
ffi::sqlite3_bind_parameter_count(self.stmt),
self.stmt.bind_parameter_count(),
params.len());
for (i, p) in params.iter().enumerate() {
try!(self.conn.decode_result(p.bind_parameter(self.stmt, (i + 1) as c_int)));
try!(unsafe {
self.conn.decode_result(p.bind_parameter(self.stmt.ptr(), (i + 1) as c_int))
});
}
Ok(())
}
fn finalize_(&mut self) -> Result<()> {
let r = unsafe { ffi::sqlite3_finalize(self.stmt) };
self.stmt = ptr::null_mut();
self.conn.decode_result(r)
let mut stmt = RawStatement::new(ptr::null_mut());
mem::swap(&mut stmt, &mut self.stmt);
self.conn.decode_result(stmt.finalize())
}
}
impl<'conn> Into<RawStatement> for Statement<'conn> {
fn into(mut self) -> RawStatement {
let mut stmt = RawStatement::new(ptr::null_mut());
mem::swap(&mut stmt, &mut self.stmt);
stmt
}
}
impl<'conn> fmt::Debug for Statement<'conn> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let sql = unsafe {
let c_slice = CStr::from_ptr(ffi::sqlite3_sql(self.stmt)).to_bytes();
str::from_utf8(c_slice)
};
let sql = str::from_utf8(self.stmt.sql().to_bytes());
f.debug_struct("Statement")
.field("conn", self.conn)
.field("stmt", &self.stmt)
@ -1007,9 +979,7 @@ impl<'stmt> Rows<'stmt> {
fn reset(&mut self) {
if let Some(stmt) = self.stmt.take() {
unsafe {
ffi::sqlite3_reset(stmt.stmt);
}
stmt.stmt.reset();
}
}
@ -1025,7 +995,7 @@ impl<'stmt> Rows<'stmt> {
/// or `query_and_then` instead, which return types that implement `Iterator`.
pub fn next<'a>(&'a mut self) -> Option<Result<Row<'a, 'stmt>>> {
self.stmt.and_then(|stmt| {
match unsafe { ffi::sqlite3_step(stmt.stmt) } {
match stmt.stmt.step() {
ffi::SQLITE_ROW => {
Some(Ok(Row {
stmt: stmt,
@ -1088,8 +1058,8 @@ impl<'a, 'stmt> Row<'a, 'stmt> {
unsafe {
let idx = try!(idx.idx(self.stmt));
if T::column_has_valid_sqlite_type(self.stmt.stmt, idx) {
FromSql::column_result(self.stmt.stmt, idx)
if T::column_has_valid_sqlite_type(self.stmt.stmt.ptr(), idx) {
FromSql::column_result(self.stmt.stmt.ptr(), idx)
} else {
Err(Error::InvalidColumnType)
}
@ -1112,7 +1082,7 @@ pub trait RowIndex {
impl RowIndex for i32 {
#[inline]
fn idx(&self, stmt: &Statement) -> Result<i32> {
if *self < 0 || *self >= stmt.column_count {
if *self < 0 || *self >= stmt.column_count() {
Err(Error::InvalidColumnIndex(*self))
} else {
Ok(*self)

12
src/named_params.rs
View File

@ -2,8 +2,6 @@ use std::convert;
use std::result;
use libc::c_int;
use super::ffi;
use {Result, Error, Connection, Statement, MappedRows, AndThenRows, Rows, Row, str_to_cstring};
use types::ToSql;
@ -58,11 +56,7 @@ impl<'conn> Statement<'conn> {
/// is valid but not a bound parameter of this statement.
pub fn parameter_index(&self, name: &str) -> Result<Option<i32>> {
let c_name = try!(str_to_cstring(name));
let c_index = unsafe { ffi::sqlite3_bind_parameter_index(self.stmt, c_name.as_ptr()) };
Ok(match c_index {
0 => None, // A zero is returned if no matching parameter is found.
n => Some(n),
})
Ok(self.stmt.bind_parameter_index(&c_name))
}
/// Execute the prepared statement with named parameter(s). If any parameters
@ -89,7 +83,7 @@ impl<'conn> Statement<'conn> {
/// which case `query` should be used instead), or the underling SQLite call fails.
pub fn execute_named(&mut self, params: &[(&str, &ToSql)]) -> Result<c_int> {
try!(self.bind_parameters_named(params));
unsafe { self.execute_() }
self.execute_()
}
/// Execute the prepared statement with named parameter(s), returning a handle for the
@ -210,7 +204,7 @@ impl<'conn> Statement<'conn> {
fn bind_parameters_named(&mut self, params: &[(&str, &ToSql)]) -> Result<()> {
for &(name, value) in params {
if let Some(i) = try!(self.parameter_index(name)) {
try!(self.conn.decode_result(unsafe { value.bind_parameter(self.stmt, i) }));
try!(self.conn.decode_result(unsafe { value.bind_parameter(self.stmt.ptr(), i) }));
} else {
return Err(Error::InvalidParameterName(name.into()));
}

70
src/raw_statement.rs Normal file
View File

@ -0,0 +1,70 @@
use std::ffi::CStr;
use std::ptr;
use libc::c_int;
use super::ffi;
// Private newtype for raw sqlite3_stmts that finalize themselves when dropped.
#[derive(Debug)]
pub struct RawStatement(*mut ffi::sqlite3_stmt);
impl RawStatement {
pub fn new(stmt: *mut ffi::sqlite3_stmt) -> RawStatement {
RawStatement(stmt)
}
pub unsafe fn ptr(&self) -> *mut ffi::sqlite3_stmt {
self.0
}
pub fn column_count(&self) -> c_int {
unsafe { ffi::sqlite3_column_count(self.0) }
}
pub fn column_name(&self, idx: c_int) -> &CStr {
unsafe { CStr::from_ptr(ffi::sqlite3_column_name(self.0, idx)) }
}
pub fn step(&self) -> c_int {
unsafe { ffi::sqlite3_step(self.0) }
}
pub fn reset(&self) -> c_int {
unsafe { ffi::sqlite3_reset(self.0) }
}
pub fn bind_parameter_count(&self) -> c_int {
unsafe { ffi::sqlite3_bind_parameter_count(self.0) }
}
pub fn bind_parameter_index(&self, name: &CStr) -> Option<c_int> {
let r = unsafe { ffi::sqlite3_bind_parameter_index(self.0, name.as_ptr()) };
match r {
0 => None,
i => Some(i),
}
}
pub fn clear_bindings(&self) -> c_int {
unsafe { ffi::sqlite3_clear_bindings(self.0) }
}
pub fn sql(&self) -> &CStr {
unsafe { CStr::from_ptr(ffi::sqlite3_sql(self.0)) }
}
pub fn finalize(mut self) -> c_int {
self.finalize_()
}
fn finalize_(&mut self) -> c_int {
let r = unsafe { ffi::sqlite3_finalize(self.0) };
self.0 = ptr::null_mut();
r
}
}
impl Drop for RawStatement {
fn drop(&mut self) {
self.finalize_();
}
}

403
src/transaction.rs
View File

@ -1,4 +1,3 @@
use std::borrow::Cow;
use std::ops::Deref;
use {Result, Connection};
@ -14,16 +13,30 @@ pub enum TransactionBehavior {
Exclusive,
}
/// Options for how a Transaction or Savepoint should behave when it is dropped.
#[derive(Copy,Clone,PartialEq,Eq)]
pub enum DropBehavior {
/// Roll back the changes. This is the default.
Rollback,
/// Commit the changes.
Commit,
/// Do not commit or roll back changes - this will leave the transaction or savepoint
/// open, so should be used with care.
Ignore,
}
/// Old name for `Transaction`. `SqliteTransaction` is deprecated.
pub type SqliteTransaction<'conn> = Transaction<'conn>;
///
/// Represents a transaction on a database connection.
///
/// ## Note
///
/// Transactions will roll back by default. Use the `set_commit` or `commit` methods to commit the
/// transaction.
/// Transactions will roll back by default. Use `commit` method to explicitly commit the
/// transaction, or use `set_drop_behavior` to change what happens when the transaction
/// is dropped.
///
/// ## Example
///
@ -42,9 +55,39 @@ pub type SqliteTransaction<'conn> = Transaction<'conn>;
/// ```
pub struct Transaction<'conn> {
conn: &'conn Connection,
drop_behavior: DropBehavior,
committed: bool,
}
/// Represents a savepoint on a database connection.
///
/// ## Note
///
/// Savepoints will roll back by default. Use `commit` method to explicitly commit the
/// savepoint, or use `set_drop_behavior` to change what happens when the savepoint
/// is dropped.
///
/// ## Example
///
/// ```rust,no_run
/// # use rusqlite::{Connection, Result};
/// # fn do_queries_part_1(conn: &Connection) -> Result<()> { Ok(()) }
/// # fn do_queries_part_2(conn: &Connection) -> Result<()> { Ok(()) }
/// fn perform_queries(conn: &Connection) -> Result<()> {
/// let sp = try!(conn.savepoint());
///
/// try!(do_queries_part_1(conn)); // sp causes rollback if this fails
/// try!(do_queries_part_2(conn)); // sp causes rollback if this fails
///
/// sp.commit()
/// }
/// ```
pub struct Savepoint<'conn> {
conn: &'conn Connection,
name: String,
depth: u32,
commit: bool,
finished: bool,
drop_behavior: DropBehavior,
committed: bool,
}
impl<'conn> Transaction<'conn> {
@ -58,9 +101,8 @@ impl<'conn> Transaction<'conn> {
conn.execute_batch(query).map(move |_| {
Transaction {
conn: conn,
depth: 0,
commit: false,
finished: false,
drop_behavior: DropBehavior::Rollback,
committed: false,
}
})
}
@ -91,36 +133,23 @@ impl<'conn> Transaction<'conn> {
/// tx.commit()
/// }
/// ```
pub fn savepoint(&mut self) -> Result<Transaction> {
let new_depth = self.depth + 1;
self.conn.execute_batch(&format!("SAVEPOINT sp{}", new_depth)).map(|_| {
Transaction {
conn: self.conn,
depth: new_depth,
commit: false,
finished: false,
}
})
pub fn savepoint(&mut self) -> Result<Savepoint> {
Savepoint::with_depth(self.conn, 1)
}
/// Returns whether or not the transaction is currently set to commit.
pub fn will_commit(&self) -> bool {
self.commit
/// Create a new savepoint with a custom savepoint name. See `savepoint()`.
pub fn savepoint_with_name<T: Into<String>>(&mut self, name: T) -> Result<Savepoint> {
Savepoint::with_depth_and_name(self.conn, 1, name)
}
/// Returns whether or not the transaction is currently set to rollback.
pub fn will_rollback(&self) -> bool {
!self.commit
/// Get the current setting for what happens to the transaction when it is dropped.
pub fn drop_behavior(&self) -> DropBehavior {
self.drop_behavior
}
/// Set the transaction to commit at its completion.
pub fn set_commit(&mut self) {
self.commit = true
}
/// Set the transaction to rollback at its completion.
pub fn set_rollback(&mut self) {
self.commit = false
/// Configure the transaction to perform the specified action when it is dropped.
pub fn set_drop_behavior(&mut self, drop_behavior: DropBehavior) {
self.drop_behavior = drop_behavior
}
/// A convenience method which consumes and commits a transaction.
@ -129,13 +158,8 @@ impl<'conn> Transaction<'conn> {
}
fn commit_(&mut self) -> Result<()> {
self.finished = true;
let sql = if self.depth == 0 {
Cow::Borrowed("COMMIT")
} else {
Cow::Owned(format!("RELEASE sp{}", self.depth))
};
self.conn.execute_batch(&sql)
self.committed = true;
self.conn.execute_batch("COMMIT")
}
/// A convenience method which consumes and rolls back a transaction.
@ -144,17 +168,12 @@ impl<'conn> Transaction<'conn> {
}
fn rollback_(&mut self) -> Result<()> {
self.finished = true;
let sql = if self.depth == 0 {
Cow::Borrowed("ROLLBACK")
} else {
Cow::Owned(format!("ROLLBACK TO sp{}", self.depth))
};
self.conn.execute_batch(&sql)
self.committed = true;
self.conn.execute_batch("ROLLBACK")
}
/// Consumes the transaction, committing or rolling back according to the current setting
/// (see `will_commit`, `will_rollback`).
/// (see `drop_behavior`).
///
/// Functionally equivalent to the `Drop` implementation, but allows callers to see any
/// errors that occur.
@ -163,10 +182,13 @@ impl<'conn> Transaction<'conn> {
}
fn finish_(&mut self) -> Result<()> {
match (self.finished, self.commit) {
(true, _) => Ok(()),
(false, true) => self.commit_(),
(false, false) => self.rollback_(),
if self.committed {
return Ok(());
}
match self.drop_behavior() {
DropBehavior::Commit => self.commit_(),
DropBehavior::Rollback => self.rollback_(),
DropBehavior::Ignore => Ok(()),
}
}
}
@ -186,10 +208,196 @@ impl<'conn> Drop for Transaction<'conn> {
}
}
impl<'conn> Savepoint<'conn> {
fn with_depth_and_name<T: Into<String>>(conn: &Connection, depth: u32, name: T) -> Result<Savepoint> {
let name = name.into();
conn.execute_batch(&format!("SAVEPOINT {}", name)).map(|_| {
Savepoint {
conn: conn,
name: name,
depth: depth,
drop_behavior: DropBehavior::Rollback,
committed: false,
}
})
}
fn with_depth(conn: &Connection, depth: u32) -> Result<Savepoint> {
let name = format!("_rusqlite_sp_{}", depth);
Savepoint::with_depth_and_name(conn, depth, name)
}
/// Begin a new savepoint. Can be nested.
pub fn new(conn: &mut Connection) -> Result<Savepoint> {
Savepoint::with_depth(conn, 0)
}
/// Begin a new savepoint with a user-provided savepoint name.
pub fn with_name<T: Into<String>>(conn: &mut Connection, name: T) -> Result<Savepoint> {
Savepoint::with_depth_and_name(conn, 0, name)
}
/// Begin a nested savepoint.
pub fn savepoint(&mut self) -> Result<Savepoint> {
Savepoint::with_depth(self.conn, self.depth + 1)
}
/// Begin a nested savepoint with a user-provided savepoint name.
pub fn savepoint_with_name<T: Into<String>>(&mut self, name: T) -> Result<Savepoint> {
Savepoint::with_depth_and_name(self.conn, self.depth + 1, name)
}
/// Get the current setting for what happens to the savepoint when it is dropped.
pub fn drop_behavior(&self) -> DropBehavior {
self.drop_behavior
}
/// Configure the savepoint to perform the specified action when it is dropped.
pub fn set_drop_behavior(&mut self, drop_behavior: DropBehavior) {
self.drop_behavior = drop_behavior
}
/// A convenience method which consumes and commits a savepoint.
pub fn commit(mut self) -> Result<()> {
self.commit_()
}
fn commit_(&mut self) -> Result<()> {
self.committed = true;
self.conn.execute_batch(&format!("RELEASE {}", self.name))
}
/// A convenience method which rolls back a savepoint.
///
/// ## Note
///
/// Unlike `Transaction`s, savepoints remain active after they have been rolled back,
/// and can be rolled back again or committed.
pub fn rollback(&mut self) -> Result<()> {
self.conn.execute_batch(&format!("ROLLBACK TO {}", self.name))
}
/// Consumes the savepoint, committing or rolling back according to the current setting
/// (see `drop_behavior`).
///
/// Functionally equivalent to the `Drop` implementation, but allows callers to see any
/// errors that occur.
pub fn finish(mut self) -> Result<()> {
self.finish_()
}
fn finish_(&mut self) -> Result<()> {
if self.committed {
return Ok(());
}
match self.drop_behavior() {
DropBehavior::Commit => self.commit_(),
DropBehavior::Rollback => self.rollback(),
DropBehavior::Ignore => Ok(()),
}
}
}
impl<'conn> Deref for Savepoint<'conn> {
type Target = Connection;
fn deref(&self) -> &Connection {
self.conn
}
}
#[allow(unused_must_use)]
impl<'conn> Drop for Savepoint<'conn> {
fn drop(&mut self) {
self.finish_();
}
}
impl Connection {
/// Begin a new transaction with the default behavior (DEFERRED).
///
/// The transaction defaults to rolling back when it is dropped. If you want the transaction to
/// commit, you must call `commit` or `set_drop_behavior(DropBehavior::Commit)`.
///
/// ## Example
///
/// ```rust,no_run
/// # use rusqlite::{Connection, Result};
/// # fn do_queries_part_1(conn: &Connection) -> Result<()> { Ok(()) }
/// # fn do_queries_part_2(conn: &Connection) -> Result<()> { Ok(()) }
/// fn perform_queries(conn: &Connection) -> Result<()> {
/// let tx = try!(conn.transaction());
///
/// try!(do_queries_part_1(conn)); // tx causes rollback if this fails
/// try!(do_queries_part_2(conn)); // tx causes rollback if this fails
///
/// tx.commit()
/// }
/// ```
///
/// # Failure
///
/// Will return `Err` if the underlying SQLite call fails.
pub fn transaction(&mut self) -> Result<Transaction> {
Transaction::new(self, TransactionBehavior::Deferred)
}
/// Begin a new transaction with a specified behavior.
///
/// See `transaction`.
///
/// # Failure
///
/// Will return `Err` if the underlying SQLite call fails.
pub fn transaction_with_behavior(&mut self, behavior: TransactionBehavior) -> Result<Transaction> {
Transaction::new(self, behavior)
}
/// Begin a new savepoint with the default behavior (DEFERRED).
///
/// The savepoint defaults to rolling back when it is dropped. If you want the savepoint to
/// commit, you must call `commit` or `set_drop_behavior(DropBehavior::Commit)`.
///
/// ## Example
///
/// ```rust,no_run
/// # use rusqlite::{Connection, Result};
/// # fn do_queries_part_1(conn: &Connection) -> Result<()> { Ok(()) }
/// # fn do_queries_part_2(conn: &Connection) -> Result<()> { Ok(()) }
/// fn perform_queries(conn: &Connection) -> Result<()> {
/// let sp = try!(conn.savepoint());
///
/// try!(do_queries_part_1(conn)); // sp causes rollback if this fails
/// try!(do_queries_part_2(conn)); // sp causes rollback if this fails
///
/// sp.commit()
/// }
/// ```
///
/// # Failure
///
/// Will return `Err` if the underlying SQLite call fails.
pub fn savepoint(&mut self) -> Result<Savepoint> {
Savepoint::new(self)
}
/// Begin a new savepoint with a specified name.
///
/// See `savepoint`.
///
/// # Failure
///
/// Will return `Err` if the underlying SQLite call fails.
pub fn savepoint_with_name<T: Into<String>>(&mut self, name: T) -> Result<Savepoint> {
Savepoint::with_name(self, name)
}
}
#[cfg(test)]
#[cfg_attr(feature="clippy", allow(similar_names))]
mod test {
use Connection;
use super::DropBehavior;
fn checked_memory_handle() -> Connection {
let db = Connection::open_in_memory().unwrap();
@ -208,7 +416,7 @@ mod test {
{
let mut tx = db.transaction().unwrap();
tx.execute_batch("INSERT INTO foo VALUES(2)").unwrap();
tx.set_commit()
tx.set_drop_behavior(DropBehavior::Commit)
}
{
let tx = db.transaction().unwrap();
@ -221,35 +429,36 @@ mod test {
fn test_explicit_rollback_commit() {
let mut db = checked_memory_handle();
{
let tx = db.transaction().unwrap();
tx.execute_batch("INSERT INTO foo VALUES(1)").unwrap();
tx.rollback().unwrap();
}
{
let tx = db.transaction().unwrap();
tx.execute_batch("INSERT INTO foo VALUES(2)").unwrap();
let mut tx = db.transaction().unwrap();
{
let mut sp = tx.savepoint().unwrap();
sp.execute_batch("INSERT INTO foo VALUES(1)").unwrap();
sp.rollback().unwrap();
sp.execute_batch("INSERT INTO foo VALUES(2)").unwrap();
sp.commit().unwrap();
}
tx.commit().unwrap();
}
{
let tx = db.transaction().unwrap();
assert_eq!(2i32,
tx.execute_batch("INSERT INTO foo VALUES(4)").unwrap();
tx.commit().unwrap();
}
{
let tx = db.transaction().unwrap();
assert_eq!(6i32,
tx.query_row("SELECT SUM(x) FROM foo", &[], |r| r.get(0)).unwrap());
}
}
#[test]
fn test_savepoint() {
fn assert_current_sum(x: i32, conn: &Connection) {
let i = conn.query_row("SELECT SUM(x) FROM foo", &[], |r| r.get(0)).unwrap();
assert_eq!(x, i);
}
let mut db = checked_memory_handle();
{
let mut tx = db.transaction().unwrap();
tx.execute_batch("INSERT INTO foo VALUES(1)").unwrap();
assert_current_sum(1, &tx);
tx.set_commit();
tx.set_drop_behavior(DropBehavior::Commit);
{
let mut sp1 = tx.savepoint().unwrap();
sp1.execute_batch("INSERT INTO foo VALUES(2)").unwrap();
@ -275,4 +484,64 @@ mod test {
}
assert_current_sum(1, &db);
}
#[test]
fn test_ignore_drop_behavior() {
let mut db = checked_memory_handle();
let mut tx = db.transaction().unwrap();
{
let mut sp1 = tx.savepoint().unwrap();
insert(1, &sp1);
sp1.rollback().unwrap();
insert(2, &sp1);
{
let mut sp2 = sp1.savepoint().unwrap();
sp2.set_drop_behavior(DropBehavior::Ignore);
insert(4, &sp2);
}
assert_current_sum(6, &sp1);
sp1.commit().unwrap();
}
assert_current_sum(6, &tx);
}
#[test]
fn test_savepoint_names() {
let mut db = checked_memory_handle();
{
let mut sp1 = db.savepoint_with_name("my_sp").unwrap();
insert(1, &sp1);
assert_current_sum(1, &sp1);
{
let mut sp2 = sp1.savepoint_with_name("my_sp").unwrap();
sp2.set_drop_behavior(DropBehavior::Commit);
insert(2, &sp2);
assert_current_sum(3, &sp2);
sp2.rollback().unwrap();
assert_current_sum(1, &sp2);
insert(4, &sp2);
}
assert_current_sum(5, &sp1);
sp1.rollback().unwrap();
{
let mut sp2 = sp1.savepoint_with_name("my_sp").unwrap();
sp2.set_drop_behavior(DropBehavior::Ignore);
insert(8, &sp2);
}
assert_current_sum(8, &sp1);
sp1.commit().unwrap();
}
assert_current_sum(8, &db);
}
fn insert(x: i32, conn: &Connection) {
conn.execute("INSERT INTO foo VALUES(?)", &[&x]).unwrap();
}
fn assert_current_sum(x: i32, conn: &Connection) {
let i = conn.query_row("SELECT SUM(x) FROM foo", &[], |r| r.get(0)).unwrap();
assert_eq!(x, i);
}
}