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Merge remote-tracking branch 'jgallagher/master' into named-param

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This commit is contained in:
Gwenael Treguier 2015-11-11 14:39:15 +01:00
commit db7345624f
6 changed files with 376 additions and 46 deletions
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1
.travis.yml
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@ -1,4 +1,5 @@
language: rust
sudo: false
env:
global:

3
CONTRIBUTORS.md
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@ -5,3 +5,6 @@ rusqlite contributors (sorted alphabetically)
* [Marcus Klaas de Vries](https://github.com/marcusklaas)
* [gwenn](https://github.com/gwenn)
* [Jimmy Lu](https://github.com/Yuhta)
* [Huon Wilson](https://github.com/huonw)
* [Patrick Fernie](https://github.com/pfernie)
* [Steve Klabnik](https://github.com/steveklabnik)

2
Cargo.toml
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@ -1,6 +1,6 @@
[package]
name = "rusqlite"
version = "0.2.0"
version = "0.4.0"
authors = ["John Gallagher <jgallagher@bignerdranch.com>"]
description = "Ergonomic wrapper for SQLite"
repository = "https://github.com/jgallagher/rusqlite"

20
Changelog.md
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@ -1,3 +1,23 @@
# Version 0.4.0 (2015-11-03)
* Adds `Sized` bound to `FromSql` trait as required by RFC 1214.
# Version 0.3.1 (2015-09-22)
* Reset underlying SQLite statements as soon as possible after executing, as recommended by
http://www.sqlite.org/cvstrac/wiki?p=ScrollingCursor.
# Version 0.3.0 (2015-09-21)
* Removes `get_opt`. Use `get_checked` instead.
* Add `query_row_and_then` and `query_and_then` convenience functions. These are analogous to
`query_row` and `query_map` but allow functions that can fail by returning `Result`s.
* Relax uses of `P: AsRef<...>` from `&P` to `P`.
* Add additional error check for calling `execute` when `query` was intended.
* Improve debug formatting of `SqliteStatement` and `SqliteConnection`.
* Changes documentation of `get_checked` to correctly indicate that it returns errors (not panics)
when given invalid types or column indices.
# Version 0.2.0 (2015-07-26)
* Add `column_names()` to `SqliteStatement`.

385
src/lib.rs
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@ -55,10 +55,11 @@ extern crate libsqlite3_sys as ffi;
#[macro_use] extern crate bitflags;
use std::default::Default;
use std::convert;
use std::mem;
use std::ptr;
use std::fmt;
use std::path::{Path};
use std::path::{Path,PathBuf};
use std::error;
use std::rc::{Rc};
use std::cell::{RefCell, Cell};
@ -91,7 +92,7 @@ unsafe fn errmsg_to_string(errmsg: *const c_char) -> String {
}
/// Encompasses an error result from a call to the SQLite C API.
#[derive(Debug)]
#[derive(Debug, PartialEq)]
pub struct SqliteError {
/// The error code returned by a SQLite C API call. See [SQLite Result
/// Codes](http://www.sqlite.org/rescode.html) for details.
@ -152,6 +153,7 @@ fn path_to_cstring(p: &Path) -> SqliteResult<CString> {
/// prepare multiple statements at the same time).
pub struct SqliteConnection {
db: RefCell<InnerSqliteConnection>,
path: Option<PathBuf>,
}
unsafe impl Send for SqliteConnection {}
@ -161,7 +163,7 @@ impl SqliteConnection {
///
/// `SqliteConnection::open(path)` is equivalent to `SqliteConnection::open_with_flags(path,
/// SQLITE_OPEN_READ_WRITE | SQLITE_OPEN_CREATE)`.
pub fn open<P: AsRef<Path>>(path: &P) -> SqliteResult<SqliteConnection> {
pub fn open<P: AsRef<Path>>(path: P) -> SqliteResult<SqliteConnection> {
let flags = Default::default();
SqliteConnection::open_with_flags(path, flags)
}
@ -176,11 +178,11 @@ impl SqliteConnection {
///
/// Database Connection](http://www.sqlite.org/c3ref/open.html) for a description of valid
/// flag combinations.
pub fn open_with_flags<P: AsRef<Path>>(path: &P, flags: SqliteOpenFlags)
pub fn open_with_flags<P: AsRef<Path>>(path: P, flags: SqliteOpenFlags)
-> SqliteResult<SqliteConnection> {
let c_path = try!(path_to_cstring(path.as_ref()));
InnerSqliteConnection::open_with_flags(&c_path, flags).map(|db| {
SqliteConnection{ db: RefCell::new(db) }
SqliteConnection{ db: RefCell::new(db), path: Some(path.as_ref().to_path_buf()) }
})
}
@ -191,7 +193,7 @@ impl SqliteConnection {
pub fn open_in_memory_with_flags(flags: SqliteOpenFlags) -> SqliteResult<SqliteConnection> {
let c_memory = try!(str_to_cstring(":memory:"));
InnerSqliteConnection::open_with_flags(&c_memory, flags).map(|db| {
SqliteConnection{ db: RefCell::new(db) }
SqliteConnection{ db: RefCell::new(db), path: None }
})
}
@ -302,6 +304,37 @@ impl SqliteConnection {
}
}
/// Convenience method to execute a query that is expected to return a single row,
/// and execute a mapping via `f` on that returned row with the possibility of failure.
/// The `Result` type of `f` must implement `std::convert::From<SqliteError>`.
///
/// ## Example
///
/// ```rust,no_run
/// # use rusqlite::{SqliteResult,SqliteConnection};
/// fn preferred_locale(conn: &SqliteConnection) -> SqliteResult<String> {
/// conn.query_row_and_then("SELECT value FROM preferences WHERE name='locale'", &[], |row| {
/// row.get_checked(0)
/// })
/// }
/// ```
///
/// If the query returns more than one row, all rows except the first are ignored.
pub fn query_row_and_then<T, E, F>(&self, sql: &str, params: &[&ToSql], f: F) -> Result<T, E>
where F: FnOnce(SqliteRow) -> Result<T, E>,
E: convert::From<SqliteError> {
let mut stmt = try!(self.prepare(sql));
let mut rows = try!(stmt.query(params));
match rows.next() {
Some(row) => row.map_err(E::from).and_then(f),
None => Err(E::from(SqliteError{
code: ffi::SQLITE_NOTICE,
message: "Query did not return a row".to_string(),
}))
}
}
/// Convenience method to execute a query that is expected to return a single row.
///
/// ## Example
@ -394,10 +427,10 @@ impl SqliteConnection {
/// fn load_my_extension(conn: &SqliteConnection) -> SqliteResult<()> {
/// let _guard = try!(SqliteLoadExtensionGuard::new(conn));
///
/// conn.load_extension(Path::new("my_sqlite_extension"), None)
/// conn.load_extension("my_sqlite_extension", None)
/// }
#[cfg(feature = "load_extension")]
pub fn load_extension<P: AsRef<Path>>(&self, dylib_path: &P, entry_point: Option<&str>) -> SqliteResult<()> {
pub fn load_extension<P: AsRef<Path>>(&self, dylib_path: P, entry_point: Option<&str>) -> SqliteResult<()> {
self.db.borrow_mut().load_extension(dylib_path, entry_point)
}
@ -412,7 +445,7 @@ impl SqliteConnection {
impl fmt::Debug for SqliteConnection {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "SqliteConnection()")
write!(f, "SqliteConnection( path: {:?} )", &self.path)
}
}
@ -543,6 +576,12 @@ impl InnerSqliteConnection {
fn prepare<'a>(&mut self,
conn: &'a SqliteConnection,
sql: &str) -> SqliteResult<SqliteStatement<'a>> {
if sql.len() >= ::std::i32::MAX as usize {
return Err(SqliteError {
code: ffi::SQLITE_TOOBIG,
message: "statement too long".to_string()
});
}
let mut c_stmt: *mut ffi::sqlite3_stmt = unsafe { mem::uninitialized() };
let c_sql = try!(str_to_cstring(sql));
let r = unsafe {
@ -572,16 +611,18 @@ pub struct SqliteStatement<'conn> {
conn: &'conn SqliteConnection,
stmt: *mut ffi::sqlite3_stmt,
needs_reset: bool,
column_count: c_int,
}
impl<'conn> SqliteStatement<'conn> {
fn new(conn: &SqliteConnection, stmt: *mut ffi::sqlite3_stmt) -> SqliteStatement {
SqliteStatement{ conn: conn, stmt: stmt, needs_reset: false }
SqliteStatement{ conn: conn, stmt: stmt, needs_reset: false,
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 = unsafe { ffi::sqlite3_column_count(self.stmt) };
let n = self.column_count;
let mut cols = Vec::with_capacity(n as usize);
for i in 0..n {
let slice = unsafe {
@ -612,8 +653,6 @@ impl<'conn> SqliteStatement<'conn> {
/// }
/// ```
pub fn execute(&mut self, params: &[&ToSql]) -> SqliteResult<c_int> {
self.reset_if_needed();
unsafe {
try!(self.bind_parameters(params));
self.execute_()
@ -624,7 +663,14 @@ impl<'conn> SqliteStatement<'conn> {
let r = ffi::sqlite3_step(self.stmt);
ffi::sqlite3_reset(self.stmt);
match r {
ffi::SQLITE_DONE => Ok(self.conn.changes()),
ffi::SQLITE_DONE => {
if self.column_count != 0 {
Err(SqliteError{ code: ffi::SQLITE_MISUSE,
message: "Unexpected column count - did you mean to call query?".to_string() })
} else {
Ok(self.conn.changes())
}
},
ffi::SQLITE_ROW => Err(SqliteError{ code: r,
message: "Unexpected row result - did you mean to call query?".to_string() }),
_ => Err(self.conn.decode_result(r).unwrap_err()),
@ -678,6 +724,25 @@ impl<'conn> SqliteStatement<'conn> {
})
}
/// Executes the prepared statement and maps a function over the resulting
/// rows, where the function returns a `Result` with `Error` type implementing
/// `std::convert::From<SqliteError>` (so errors can be unified).
///
/// Unlike the iterator produced by `query`, the returned iterator does not expose the possibility
/// for accessing stale rows.
pub fn query_and_then<'a, T, E, F>(&'a mut self, params: &[&ToSql], f: F)
-> SqliteResult<AndThenRows<'a, F>>
where T: 'static,
E: convert::From<SqliteError>,
F: FnMut(SqliteRow) -> Result<T, E> {
let row_iter = try!(self.query(params));
Ok(AndThenRows{
rows: row_iter,
map: f,
})
}
/// Consumes the statement.
///
/// Functionally equivalent to the `Drop` implementation, but allows callers to see any errors
@ -715,7 +780,11 @@ impl<'conn> SqliteStatement<'conn> {
impl<'conn> fmt::Debug for SqliteStatement<'conn> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "Statement( conn: {:?}, stmt: {:?} )", self.conn, self.stmt)
let sql = unsafe {
let c_slice = CStr::from_ptr(ffi::sqlite3_sql(self.stmt)).to_bytes();
str::from_utf8(c_slice)
};
write!(f, "SqliteStatement( conn: {:?}, stmt: {:?}, sql: {:?} )", self.conn, self.stmt, sql)
}
}
@ -742,6 +811,26 @@ impl<'stmt, T, F> Iterator for MappedRows<'stmt, F>
}
}
/// An iterator over the mapped resulting rows of a query, with an Error type
/// unifying with SqliteError.
pub struct AndThenRows<'stmt, F> {
rows: SqliteRows<'stmt>,
map: F,
}
impl<'stmt, T, E, F> Iterator for AndThenRows<'stmt, F>
where T: 'static,
E: convert::From<SqliteError>,
F: FnMut(SqliteRow) -> Result<T, E> {
type Item = Result<T, E>;
fn next(&mut self) -> Option<Self::Item> {
self.rows.next().map(|row_result| row_result
.map_err(E::from)
.and_then(|row| (self.map)(row)))
}
}
/// An iterator over the resulting rows of a query.
///
/// ## Warning
@ -852,7 +941,7 @@ impl<'stmt> SqliteRow<'stmt> {
/// Panics if `idx` is outside the range of columns in the returned query or if this row
/// is stale.
pub fn get<T: FromSql>(&self, idx: c_int) -> T {
self.get_opt(idx).unwrap()
self.get_checked(idx).unwrap()
}
/// Get the value of a particular column of the result row.
@ -862,40 +951,27 @@ impl<'stmt> SqliteRow<'stmt> {
/// Returns a `SQLITE_MISMATCH`-coded `SqliteError` if the underlying SQLite column
/// type is not a valid type as a source for `T`.
///
/// Panics if `idx` is outside the range of columns in the returned query or if this row
/// is stale.
pub fn get_checked<T: FromSql>(&self, idx: c_int) -> SqliteResult<T> {
let valid_column_type = unsafe {
T::column_has_valid_sqlite_type(self.stmt.stmt, idx)
};
if valid_column_type {
Ok(self.get(idx))
} else {
Err(SqliteError{
code: ffi::SQLITE_MISMATCH,
message: "Invalid column type".to_string(),
})
}
}
/// Attempt to get the value of a particular column of the result row.
///
/// ## Failure
///
/// Returns a `SQLITE_MISUSE`-coded `SqliteError` if `idx` is outside the valid column range
/// for this row or if this row is stale.
pub fn get_opt<T: FromSql>(&self, idx: c_int) -> SqliteResult<T> {
pub fn get_checked<T: FromSql>(&self, idx: c_int) -> SqliteResult<T> {
if self.row_idx != self.current_row.get() {
return Err(SqliteError{ code: ffi::SQLITE_MISUSE,
message: "Cannot get values from a row after advancing to next row".to_string() });
}
unsafe {
if idx < 0 || idx >= ffi::sqlite3_column_count(self.stmt.stmt) {
if idx < 0 || idx >= self.stmt.column_count {
return Err(SqliteError{ code: ffi::SQLITE_MISUSE,
message: "Invalid column index".to_string() });
}
FromSql::column_result(self.stmt.stmt, idx)
if T::column_has_valid_sqlite_type(self.stmt.stmt, idx) {
FromSql::column_result(self.stmt.stmt, idx)
} else {
Err(SqliteError{
code: ffi::SQLITE_MISMATCH,
message: "Invalid column type".to_string(),
})
}
}
}
}
@ -904,8 +980,10 @@ impl<'stmt> SqliteRow<'stmt> {
mod test {
extern crate libsqlite3_sys as ffi;
extern crate tempdir;
use super::*;
pub use super::*;
use self::tempdir::TempDir;
pub use std::error::Error as StdError;
pub use std::fmt;
// this function is never called, but is still type checked; in
// particular, calls with specific instantiations will require
@ -915,7 +993,7 @@ mod test {
ensure_send::<SqliteConnection>();
}
fn checked_memory_handle() -> SqliteConnection {
pub fn checked_memory_handle() -> SqliteConnection {
SqliteConnection::open_in_memory().unwrap()
}
@ -989,6 +1067,14 @@ mod test {
assert_eq!(3i32, db.query_row("SELECT SUM(x) FROM foo", &[], |r| r.get(0)).unwrap());
}
#[test]
fn test_execute_select() {
let db = checked_memory_handle();
let err = db.execute("SELECT 1 WHERE 1 < ?", &[&1i32]).unwrap_err();
assert!(err.code == ffi::SQLITE_MISUSE);
assert!(err.message == "Unexpected column count - did you mean to call query?");
}
#[test]
fn test_prepare_column_names() {
let db = checked_memory_handle();
@ -1117,7 +1203,7 @@ mod test {
assert_eq!(2i32, second.get(0));
let result = first.get_opt::<i32>(0);
let result = first.get_checked::<i32>(0);
assert!(result.unwrap_err().message.contains("advancing to next row"));
}
@ -1135,4 +1221,217 @@ mod test {
}
assert_eq!(db.last_insert_rowid(), 10);
}
#[test]
fn test_statement_debugging() {
let db = checked_memory_handle();
let query = "SELECT 12345";
let stmt = db.prepare(query).unwrap();
assert!(format!("{:?}", stmt).contains(query));
}
mod query_and_then_tests {
extern crate libsqlite3_sys as ffi;
use super::*;
#[derive(Debug, PartialEq)]
enum CustomError {
SomeError,
Sqlite(SqliteError),
}
impl fmt::Display for CustomError {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
match *self {
CustomError::SomeError => write!(f, "{}", self.description()),
CustomError::Sqlite(ref se) => write!(f, "{}: {}", self.description(), se),
}
}
}
impl StdError for CustomError {
fn description(&self) -> &str { "my custom error" }
fn cause(&self) -> Option<&StdError> {
match *self {
CustomError::SomeError => None,
CustomError::Sqlite(ref se) => Some(se),
}
}
}
impl From<SqliteError> for CustomError {
fn from(se: SqliteError) -> CustomError {
CustomError::Sqlite(se)
}
}
type CustomResult<T> = Result<T, CustomError>;
#[test]
fn test_query_and_then() {
let db = checked_memory_handle();
let sql = "BEGIN;
CREATE TABLE foo(x INTEGER, y TEXT);
INSERT INTO foo VALUES(4, \"hello\");
INSERT INTO foo VALUES(3, \", \");
INSERT INTO foo VALUES(2, \"world\");
INSERT INTO foo VALUES(1, \"!\");
END;";
db.execute_batch(sql).unwrap();
let mut query = db.prepare("SELECT x, y FROM foo ORDER BY x DESC").unwrap();
let results: SqliteResult<Vec<String>> = query
.query_and_then(&[], |row| row.get_checked(1))
.unwrap()
.collect();
assert_eq!(results.unwrap().concat(), "hello, world!");
}
#[test]
fn test_query_and_then_fails() {
let db = checked_memory_handle();
let sql = "BEGIN;
CREATE TABLE foo(x INTEGER, y TEXT);
INSERT INTO foo VALUES(4, \"hello\");
INSERT INTO foo VALUES(3, \", \");
INSERT INTO foo VALUES(2, \"world\");
INSERT INTO foo VALUES(1, \"!\");
END;";
db.execute_batch(sql).unwrap();
let mut query = db.prepare("SELECT x, y FROM foo ORDER BY x DESC").unwrap();
let bad_type: SqliteResult<Vec<f64>> = query
.query_and_then(&[], |row| row.get_checked(1))
.unwrap()
.collect();
assert_eq!(bad_type, Err(SqliteError{
code: ffi::SQLITE_MISMATCH,
message: "Invalid column type".to_owned(),
}));
let bad_idx: SqliteResult<Vec<String>> = query
.query_and_then(&[], |row| row.get_checked(3))
.unwrap()
.collect();
assert_eq!(bad_idx, Err(SqliteError{
code: ffi::SQLITE_MISUSE,
message: "Invalid column index".to_owned(),
}));
}
#[test]
fn test_query_and_then_custom_error() {
let db = checked_memory_handle();
let sql = "BEGIN;
CREATE TABLE foo(x INTEGER, y TEXT);
INSERT INTO foo VALUES(4, \"hello\");
INSERT INTO foo VALUES(3, \", \");
INSERT INTO foo VALUES(2, \"world\");
INSERT INTO foo VALUES(1, \"!\");
END;";
db.execute_batch(sql).unwrap();
let mut query = db.prepare("SELECT x, y FROM foo ORDER BY x DESC").unwrap();
let results: CustomResult<Vec<String>> = query
.query_and_then(&[], |row| row.get_checked(1).map_err(CustomError::Sqlite))
.unwrap()
.collect();
assert_eq!(results.unwrap().concat(), "hello, world!");
}
#[test]
fn test_query_and_then_custom_error_fails() {
let db = checked_memory_handle();
let sql = "BEGIN;
CREATE TABLE foo(x INTEGER, y TEXT);
INSERT INTO foo VALUES(4, \"hello\");
INSERT INTO foo VALUES(3, \", \");
INSERT INTO foo VALUES(2, \"world\");
INSERT INTO foo VALUES(1, \"!\");
END;";
db.execute_batch(sql).unwrap();
let mut query = db.prepare("SELECT x, y FROM foo ORDER BY x DESC").unwrap();
let bad_type: CustomResult<Vec<f64>> = query
.query_and_then(&[], |row| row.get_checked(1).map_err(CustomError::Sqlite))
.unwrap()
.collect();
assert_eq!(bad_type, Err(CustomError::Sqlite(SqliteError{
code: ffi::SQLITE_MISMATCH,
message: "Invalid column type".to_owned(),
})));
let bad_idx: CustomResult<Vec<String>> = query
.query_and_then(&[], |row| row.get_checked(3).map_err(CustomError::Sqlite))
.unwrap()
.collect();
assert_eq!(bad_idx, Err(CustomError::Sqlite(SqliteError{
code: ffi::SQLITE_MISUSE,
message: "Invalid column index".to_owned(),
})));
let non_sqlite_err: CustomResult<Vec<String>> = query
.query_and_then(&[], |_| Err(CustomError::SomeError))
.unwrap()
.collect();
assert_eq!(non_sqlite_err, Err(CustomError::SomeError));
}
#[test]
fn test_query_row_and_then_custom_error() {
let db = checked_memory_handle();
let sql = "BEGIN;
CREATE TABLE foo(x INTEGER, y TEXT);
INSERT INTO foo VALUES(4, \"hello\");
END;";
db.execute_batch(sql).unwrap();
let query = "SELECT x, y FROM foo ORDER BY x DESC";
let results: CustomResult<String> = db
.query_row_and_then(query, &[], |row| row.get_checked(1).map_err(CustomError::Sqlite));
assert_eq!(results.unwrap(), "hello");
}
#[test]
fn test_query_row_and_then_custom_error_fails() {
let db = checked_memory_handle();
let sql = "BEGIN;
CREATE TABLE foo(x INTEGER, y TEXT);
INSERT INTO foo VALUES(4, \"hello\");
END;";
db.execute_batch(sql).unwrap();
let query = "SELECT x, y FROM foo ORDER BY x DESC";
let bad_type: CustomResult<f64> = db
.query_row_and_then(query, &[], |row| row.get_checked(1).map_err(CustomError::Sqlite));
assert_eq!(bad_type, Err(CustomError::Sqlite(SqliteError{
code: ffi::SQLITE_MISMATCH,
message: "Invalid column type".to_owned(),
})));
let bad_idx: CustomResult<String> = db
.query_row_and_then(query, &[], |row| row.get_checked(3).map_err(CustomError::Sqlite));
assert_eq!(bad_idx, Err(CustomError::Sqlite(SqliteError{
code: ffi::SQLITE_MISUSE,
message: "Invalid column index".to_owned(),
})));
let non_sqlite_err: CustomResult<String> = db
.query_row_and_then(query, &[], |_| Err(CustomError::SomeError));
assert_eq!(non_sqlite_err, Err(CustomError::SomeError));
}
}
}

11
src/types.rs
View File

@ -74,7 +74,7 @@ pub trait ToSql {
}
/// A trait for types that can be created from a SQLite value.
pub trait FromSql {
pub trait FromSql: Sized {
unsafe fn column_result(stmt: *mut sqlite3_stmt, col: c_int) -> SqliteResult<Self>;
/// FromSql types can implement this method and use sqlite3_column_type to check that
@ -102,8 +102,12 @@ raw_to_impl!(c_double, sqlite3_bind_double);
impl<'a> ToSql for &'a str {
unsafe fn bind_parameter(&self, stmt: *mut sqlite3_stmt, col: c_int) -> c_int {
let length = self.len();
if length > ::std::i32::MAX as usize {
return ffi::SQLITE_TOOBIG;
}
match str_to_cstring(self) {
Ok(c_str) => ffi::sqlite3_bind_text(stmt, col, c_str.as_ptr(), -1,
Ok(c_str) => ffi::sqlite3_bind_text(stmt, col, c_str.as_ptr(), length as c_int,
ffi::SQLITE_TRANSIENT()),
Err(_) => ffi::SQLITE_MISUSE,
}
@ -118,6 +122,9 @@ impl ToSql for String {
impl<'a> ToSql for &'a [u8] {
unsafe fn bind_parameter(&self, stmt: *mut sqlite3_stmt, col: c_int) -> c_int {
if self.len() > ::std::i32::MAX as usize {
return ffi::SQLITE_TOOBIG;
}
ffi::sqlite3_bind_blob(
stmt, col, mem::transmute(self.as_ptr()), self.len() as c_int, ffi::SQLITE_TRANSIENT())
}