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Merge pull request #163 from jgallagher/safe-tosql

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Redesign ToSql
This commit is contained in:
John Gallagher 2016-12-30 23:37:37 -05:00 committed by GitHub
commit 5b9f915cef
12 changed files with 340 additions and 269 deletions
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2
Changelog.md
View File

@ -3,6 +3,8 @@
* BREAKING CHANGE: The `FromSql` trait has been redesigned. It now requires a single, safe
method instead of the previous definition which required implementing one or two unsafe
methods.
* BREAKING CHANGE: The `ToSql` trait has been redesigned. It can now be implemented without
`unsafe`, and implementors can choose to return either borrowed or owned results.
* Added `#[deprecated(since = "...", note = "...")]` flags (new in Rust 1.9 for libraries) to
all deprecated APIs.

7
src/blob.rs
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@ -52,10 +52,9 @@ use std::io;
use std::cmp::min;
use std::mem;
use std::ptr;
use libc::c_int;
use super::ffi;
use super::types::ToSql;
use super::types::{ToSql, ToSqlOutput};
use {Result, Connection, DatabaseName};
/// Handle to an open BLOB.
@ -244,9 +243,9 @@ impl<'conn> Drop for Blob<'conn> {
pub struct ZeroBlob(pub i32);
impl ToSql for ZeroBlob {
unsafe fn bind_parameter(&self, stmt: *mut ffi::sqlite3_stmt, col: c_int) -> c_int {
fn to_sql(&self) -> Result<ToSqlOutput> {
let ZeroBlob(length) = *self;
ffi::sqlite3_bind_zeroblob(stmt, col, length)
Ok(ToSqlOutput::ZeroBlob(length))
}
}

213
src/functions.rs
View File

@ -54,105 +54,79 @@ use std::ffi::CStr;
use std::mem;
use std::ptr;
use std::slice;
use libc::{c_int, c_double, c_char, c_void};
use libc::{c_int, c_char, c_void};
use ffi;
pub use ffi::sqlite3_context;
pub use ffi::sqlite3_value;
pub use ffi::sqlite3_value_type;
pub use ffi::sqlite3_value_numeric_type;
use ffi::sqlite3_context;
use ffi::sqlite3_value;
use types::{Null, FromSql, ValueRef};
use types::{ToSql, ToSqlOutput, FromSql, ValueRef};
use {Result, Error, Connection, str_to_cstring, InnerConnection};
/// A trait for types that can be converted into the result of an SQL function.
pub trait ToResult {
unsafe fn set_result(&self, ctx: *mut sqlite3_context);
}
fn set_result<'a>(ctx: *mut sqlite3_context, result: &ToSqlOutput<'a>) {
let value = match *result {
ToSqlOutput::Borrowed(v) => v,
ToSqlOutput::Owned(ref v) => ValueRef::from(v),
macro_rules! raw_to_impl(
($t:ty, $f:ident) => (
impl ToResult for $t {
unsafe fn set_result(&self, ctx: *mut sqlite3_context) {
ffi::$f(ctx, *self)
#[cfg(feature = "blob")]
ToSqlOutput::ZeroBlob(len) => {
return unsafe { ffi::sqlite3_result_zeroblob(ctx, len) };
}
}
)
);
};
raw_to_impl!(c_int, sqlite3_result_int);
raw_to_impl!(i64, sqlite3_result_int64);
raw_to_impl!(c_double, sqlite3_result_double);
impl<'a> ToResult for bool {
unsafe fn set_result(&self, ctx: *mut sqlite3_context) {
if *self {
ffi::sqlite3_result_int(ctx, 1)
} else {
ffi::sqlite3_result_int(ctx, 0)
}
}
}
impl<'a> ToResult for &'a str {
unsafe fn set_result(&self, ctx: *mut sqlite3_context) {
let length = self.len();
match value {
ValueRef::Null => unsafe { ffi::sqlite3_result_null(ctx) },
ValueRef::Integer(i) => unsafe { ffi::sqlite3_result_int64(ctx, i) },
ValueRef::Real(r) => unsafe { ffi::sqlite3_result_double(ctx, r) },
ValueRef::Text(ref s) => unsafe {
let length = s.len();
if length > ::std::i32::MAX as usize {
ffi::sqlite3_result_error_toobig(ctx);
return;
}
match str_to_cstring(self) {
Ok(c_str) => {
ffi::sqlite3_result_text(ctx,
c_str.as_ptr(),
length as c_int,
ffi::SQLITE_TRANSIENT())
}
} else {
let c_str = match str_to_cstring(s) {
Ok(c_str) => c_str,
// TODO sqlite3_result_error
Err(_) => ffi::sqlite3_result_error_code(ctx, ffi::SQLITE_MISUSE),
Err(_) => return ffi::sqlite3_result_error_code(ctx, ffi::SQLITE_MISUSE),
};
let destructor = if length > 0 {
ffi::SQLITE_TRANSIENT()
} else {
ffi::SQLITE_STATIC()
};
ffi::sqlite3_result_text(ctx, c_str.as_ptr(), length as c_int, destructor);
}
}
}
impl ToResult for String {
unsafe fn set_result(&self, ctx: *mut sqlite3_context) {
(&self[..]).set_result(ctx)
}
}
impl<'a> ToResult for &'a [u8] {
unsafe fn set_result(&self, ctx: *mut sqlite3_context) {
if self.len() > ::std::i32::MAX as usize {
},
ValueRef::Blob(ref b) => unsafe {
let length = b.len();
if length > ::std::i32::MAX as usize {
ffi::sqlite3_result_error_toobig(ctx);
return;
}
} else if length == 0 {
ffi::sqlite3_result_zeroblob(ctx, 0)
} else {
ffi::sqlite3_result_blob(ctx,
mem::transmute(self.as_ptr()),
self.len() as c_int,
ffi::SQLITE_TRANSIENT())
b.as_ptr() as *const c_void,
length as c_int,
ffi::SQLITE_TRANSIENT());
}
},
}
}
impl ToResult for Vec<u8> {
unsafe fn set_result(&self, ctx: *mut sqlite3_context) {
(&self[..]).set_result(ctx)
}
}
impl<T: ToResult> ToResult for Option<T> {
unsafe fn set_result(&self, ctx: *mut sqlite3_context) {
match *self {
None => ffi::sqlite3_result_null(ctx),
Some(ref t) => t.set_result(ctx),
unsafe fn report_error(ctx: *mut sqlite3_context, err: &Error) {
match err {
&Error::SqliteFailure(ref err, ref s) => {
ffi::sqlite3_result_error_code(ctx, err.extended_code);
if let Some(Ok(cstr)) = s.as_ref().map(|s| str_to_cstring(s)) {
ffi::sqlite3_result_error(ctx, cstr.as_ptr(), -1);
}
}
_ => {
ffi::sqlite3_result_error_code(ctx, ffi::SQLITE_CONSTRAINT_FUNCTION);
if let Ok(cstr) = str_to_cstring(err.description()) {
ffi::sqlite3_result_error(ctx, cstr.as_ptr(), -1);
}
}
}
impl ToResult for Null {
unsafe fn set_result(&self, ctx: *mut sqlite3_context) {
ffi::sqlite3_result_null(ctx)
}
}
@ -166,7 +140,8 @@ impl<'a> ValueRef<'a> {
ffi::SQLITE_FLOAT => ValueRef::Real(ffi::sqlite3_value_double(value)),
ffi::SQLITE_TEXT => {
let text = ffi::sqlite3_value_text(value);
assert!(!text.is_null(), "unexpected SQLITE_TEXT value type with NULL data");
assert!(!text.is_null(),
"unexpected SQLITE_TEXT value type with NULL data");
let s = CStr::from_ptr(text as *const c_char);
// sqlite3_value_text returns UTF8 data, so our unwrap here should be fine.
@ -175,14 +150,16 @@ impl<'a> ValueRef<'a> {
}
ffi::SQLITE_BLOB => {
let blob = ffi::sqlite3_value_blob(value);
assert!(!blob.is_null(), "unexpected SQLITE_BLOB value type with NULL data");
assert!(!blob.is_null(),
"unexpected SQLITE_BLOB value type with NULL data");
let len = ffi::sqlite3_value_bytes(value);
assert!(len >= 0, "unexpected negative return from sqlite3_value_bytes");
assert!(len >= 0,
"unexpected negative return from sqlite3_value_bytes");
ValueRef::Blob(from_raw_parts(blob as *const u8, len as usize))
}
_ => unreachable!("sqlite3_value_type returned invalid value")
_ => unreachable!("sqlite3_value_type returned invalid value"),
}
}
}
@ -219,7 +196,7 @@ impl<'a> Context<'a> {
let value = unsafe { ValueRef::from_value(arg) };
FromSql::column_result(value).map_err(|err| match err {
Error::InvalidColumnType => Error::InvalidFunctionParameterType,
_ => err
_ => err,
})
}
@ -259,7 +236,7 @@ impl<'a> Context<'a> {
/// `A` is the type of the aggregation context and `T` is the type of the final result.
/// Implementations should be stateless.
pub trait Aggregate<A, T>
where T: ToResult
where T: ToSql
{
/// Initializes the aggregation context. Will be called prior to the first call
/// to `step()` to set up the context for an invocation of the function. (Note:
@ -316,7 +293,7 @@ impl Connection {
x_func: F)
-> Result<()>
where F: FnMut(&Context) -> Result<T>,
T: ToResult
T: ToSql
{
self.db.borrow_mut().create_scalar_function(fn_name, n_arg, deterministic, x_func)
}
@ -333,7 +310,7 @@ impl Connection {
aggr: D)
-> Result<()>
where D: Aggregate<A, T>,
T: ToResult
T: ToSql
{
self.db
.borrow_mut()
@ -361,13 +338,13 @@ impl InnerConnection {
x_func: F)
-> Result<()>
where F: FnMut(&Context) -> Result<T>,
T: ToResult
T: ToSql
{
unsafe extern "C" fn call_boxed_closure<F, T>(ctx: *mut sqlite3_context,
argc: c_int,
argv: *mut *mut sqlite3_value)
where F: FnMut(&Context) -> Result<T>,
T: ToResult
T: ToSql
{
let ctx = Context {
ctx: ctx,
@ -375,20 +352,14 @@ impl InnerConnection {
};
let boxed_f: *mut F = mem::transmute(ffi::sqlite3_user_data(ctx.ctx));
assert!(!boxed_f.is_null(), "Internal error - null function pointer");
match (*boxed_f)(&ctx) {
Ok(r) => r.set_result(ctx.ctx),
Err(Error::SqliteFailure(err, s)) => {
ffi::sqlite3_result_error_code(ctx.ctx, err.extended_code);
if let Some(Ok(cstr)) = s.map(|s| str_to_cstring(&s)) {
ffi::sqlite3_result_error(ctx.ctx, cstr.as_ptr(), -1);
}
}
Err(err) => {
ffi::sqlite3_result_error_code(ctx.ctx, ffi::SQLITE_CONSTRAINT_FUNCTION);
if let Ok(cstr) = str_to_cstring(err.description()) {
ffi::sqlite3_result_error(ctx.ctx, cstr.as_ptr(), -1);
}
}
let t = (*boxed_f)(&ctx);
let t = t.as_ref().map(|t| ToSql::to_sql(t));
match t {
Ok(Ok(ref value)) => set_result(ctx.ctx, value),
Ok(Err(err)) => report_error(ctx.ctx, &err),
Err(err) => report_error(ctx.ctx, err),
}
}
@ -419,7 +390,7 @@ impl InnerConnection {
aggr: D)
-> Result<()>
where D: Aggregate<A, T>,
T: ToResult
T: ToSql
{
unsafe fn aggregate_context<A>(ctx: *mut sqlite3_context,
bytes: usize)
@ -431,28 +402,11 @@ impl InnerConnection {
Some(pac)
}
unsafe fn report_aggregate_error(ctx: *mut sqlite3_context, err: Error) {
match err {
Error::SqliteFailure(err, s) => {
ffi::sqlite3_result_error_code(ctx, err.extended_code);
if let Some(Ok(cstr)) = s.map(|s| str_to_cstring(&s)) {
ffi::sqlite3_result_error(ctx, cstr.as_ptr(), -1);
}
}
_ => {
ffi::sqlite3_result_error_code(ctx, ffi::SQLITE_CONSTRAINT_FUNCTION);
if let Ok(cstr) = str_to_cstring(err.description()) {
ffi::sqlite3_result_error(ctx, cstr.as_ptr(), -1);
}
}
}
}
unsafe extern "C" fn call_boxed_step<A, D, T>(ctx: *mut sqlite3_context,
argc: c_int,
argv: *mut *mut sqlite3_value)
where D: Aggregate<A, T>,
T: ToResult
T: ToSql
{
let boxed_aggr: *mut D = mem::transmute(ffi::sqlite3_user_data(ctx));
assert!(!boxed_aggr.is_null(),
@ -477,13 +431,13 @@ impl InnerConnection {
match (*boxed_aggr).step(&mut ctx, &mut **pac) {
Ok(_) => {}
Err(err) => report_aggregate_error(ctx.ctx, err),
Err(err) => report_error(ctx.ctx, &err),
};
}
unsafe extern "C" fn call_boxed_final<A, D, T>(ctx: *mut sqlite3_context)
where D: Aggregate<A, T>,
T: ToResult
T: ToSql
{
let boxed_aggr: *mut D = mem::transmute(ffi::sqlite3_user_data(ctx));
assert!(!boxed_aggr.is_null(),
@ -503,10 +457,13 @@ impl InnerConnection {
None => None,
};
match (*boxed_aggr).finalize(a) {
Ok(r) => r.set_result(ctx),
Err(err) => report_aggregate_error(ctx, err),
};
let t = (*boxed_aggr).finalize(a);
let t = t.as_ref().map(|t| ToSql::to_sql(t));
match t {
Ok(Ok(ref value)) => set_result(ctx, value),
Ok(Err(err)) => report_error(ctx, &err),
Err(err) => report_error(ctx, err),
}
}
let boxed_aggr: *mut D = Box::into_raw(Box::new(aggr));

64
src/lib.rs
View File

@ -71,9 +71,9 @@ use std::cell::RefCell;
use std::ffi::{CStr, CString};
use std::result;
use std::str;
use libc::{c_int, c_char};
use libc::{c_int, c_char, c_void};
use types::{ToSql, FromSql, ValueRef};
use types::{ToSql, ToSqlOutput, FromSql, ValueRef};
use error::{error_from_sqlite_code, error_from_handle};
use raw_statement::RawStatement;
use cache::StatementCache;
@ -877,6 +877,55 @@ impl<'conn> Statement<'conn> {
self.finalize_()
}
fn bind_parameter(&self, param: &ToSql, col: c_int) -> Result<()> {
let value = try!(param.to_sql());
let ptr = unsafe { self.stmt.ptr() };
let value = match value {
ToSqlOutput::Borrowed(v) => v,
ToSqlOutput::Owned(ref v) => ValueRef::from(v),
#[cfg(feature = "blob")]
ToSqlOutput::ZeroBlob(len) => {
return self.conn
.decode_result(unsafe { ffi::sqlite3_bind_zeroblob(ptr, col, len) });
}
};
self.conn.decode_result(match value {
ValueRef::Null => unsafe { ffi::sqlite3_bind_null(ptr, col) },
ValueRef::Integer(i) => unsafe { ffi::sqlite3_bind_int64(ptr, col, i) },
ValueRef::Real(r) => unsafe { ffi::sqlite3_bind_double(ptr, col, r) },
ValueRef::Text(ref s) => unsafe {
let length = s.len();
if length > ::std::i32::MAX as usize {
ffi::SQLITE_TOOBIG
} else {
let c_str = try!(str_to_cstring(s));
let destructor = if length > 0 {
ffi::SQLITE_TRANSIENT()
} else {
ffi::SQLITE_STATIC()
};
ffi::sqlite3_bind_text(ptr, col, c_str.as_ptr(), length as c_int, destructor)
}
},
ValueRef::Blob(ref b) => unsafe {
let length = b.len();
if length > ::std::i32::MAX as usize {
ffi::SQLITE_TOOBIG
} else if length == 0 {
ffi::sqlite3_bind_zeroblob(ptr, col, 0)
} else {
ffi::sqlite3_bind_blob(ptr,
col,
b.as_ptr() as *const c_void,
length as c_int,
ffi::SQLITE_TRANSIENT())
}
},
})
}
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 {}",
@ -884,11 +933,7 @@ impl<'conn> Statement<'conn> {
params.len());
for (i, p) in params.iter().enumerate() {
try!(unsafe {
self.conn.decode_result(
p.bind_parameter(self.stmt.ptr(), (i + 1) as c_int)
)
});
try!(self.bind_parameter(*p, (i + 1) as c_int));
}
Ok(())
@ -1114,7 +1159,8 @@ impl<'a> ValueRef<'a> {
ffi::SQLITE_FLOAT => ValueRef::Real(ffi::sqlite3_column_double(raw, col)),
ffi::SQLITE_TEXT => {
let text = ffi::sqlite3_column_text(raw, col);
assert!(!text.is_null(), "unexpected SQLITE_TEXT column type with NULL data");
assert!(!text.is_null(),
"unexpected SQLITE_TEXT column type with NULL data");
let s = CStr::from_ptr(text as *const c_char);
// sqlite3_column_text returns UTF8 data, so our unwrap here should be fine.
@ -1135,7 +1181,7 @@ impl<'a> ValueRef<'a> {
}
}
_ => unreachable!("sqlite3_column_type returned invalid value")
_ => unreachable!("sqlite3_column_type returned invalid value"),
}
}
}

4
src/named_params.rs
View File

@ -204,9 +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.ptr(), i)
}));
try!(self.bind_parameter(value, i));
} else {
return Err(Error::InvalidParameterName(name.into()));
}

22
src/types/chrono.rs
View File

@ -4,18 +4,15 @@ extern crate chrono;
use std::borrow::Cow;
use self::chrono::{NaiveDate, NaiveTime, NaiveDateTime, DateTime, TimeZone, UTC, Local};
use libc::c_int;
use {Error, Result};
use types::{FromSql, ToSql, ValueRef};
use ffi::sqlite3_stmt;
use types::{FromSql, ToSql, ToSqlOutput, ValueRef};
/// ISO 8601 calendar date without timezone => "YYYY-MM-DD"
impl ToSql for NaiveDate {
unsafe fn bind_parameter(&self, stmt: *mut sqlite3_stmt, col: c_int) -> c_int {
fn to_sql(&self) -> Result<ToSqlOutput> {
let date_str = self.format("%Y-%m-%d").to_string();
date_str.bind_parameter(stmt, col)
Ok(ToSqlOutput::from(date_str))
}
}
@ -31,9 +28,9 @@ impl FromSql for NaiveDate {
/// ISO 8601 time without timezone => "HH:MM:SS.SSS"
impl ToSql for NaiveTime {
unsafe fn bind_parameter(&self, stmt: *mut sqlite3_stmt, col: c_int) -> c_int {
fn to_sql(&self) -> Result<ToSqlOutput> {
let date_str = self.format("%H:%M:%S%.f").to_string();
date_str.bind_parameter(stmt, col)
Ok(ToSqlOutput::from(date_str))
}
}
@ -56,9 +53,9 @@ impl FromSql for NaiveTime {
/// ISO 8601 combined date and time without timezone => "YYYY-MM-DD HH:MM:SS.SSS"
impl ToSql for NaiveDateTime {
unsafe fn bind_parameter(&self, stmt: *mut sqlite3_stmt, col: c_int) -> c_int {
fn to_sql(&self) -> Result<ToSqlOutput> {
let date_str = self.format("%Y-%m-%dT%H:%M:%S%.f").to_string();
date_str.bind_parameter(stmt, col)
Ok(ToSqlOutput::from(date_str))
}
}
@ -83,9 +80,8 @@ impl FromSql for NaiveDateTime {
/// Date and time with time zone => UTC RFC3339 timestamp ("YYYY-MM-DDTHH:MM:SS.SSS+00:00").
impl<Tz: TimeZone> ToSql for DateTime<Tz> {
unsafe fn bind_parameter(&self, stmt: *mut sqlite3_stmt, col: c_int) -> c_int {
let utc_dt = self.with_timezone(&UTC);
utc_dt.to_rfc3339().bind_parameter(stmt, col)
fn to_sql(&self) -> Result<ToSqlOutput> {
Ok(ToSqlOutput::from(self.with_timezone(&UTC).to_rfc3339()))
}
}

46
src/types/mod.rs
View File

@ -50,12 +50,12 @@
//! `FromSql` for the cases where you want to know if a value was NULL (which gets translated to
//! `None`).
pub use ffi::sqlite3_stmt;
pub use self::from_sql::FromSql;
pub use self::to_sql::ToSql;
pub use self::to_sql::{ToSql, ToSqlOutput};
pub use self::value::Value;
pub use self::value_ref::ValueRef;
mod value;
mod value_ref;
mod from_sql;
mod to_sql;
@ -84,24 +84,6 @@ mod serde_json;
#[derive(Copy,Clone)]
pub struct Null;
/// Owning [dynamic type value](http://sqlite.org/datatype3.html). Value's type is typically
/// dictated by SQLite (not by the caller).
///
/// See [`ValueRef`](enum.ValueRef.html) for a non-owning dynamic type value.
#[derive(Clone,Debug,PartialEq)]
pub enum Value {
/// The value is a `NULL` value.
Null,
/// The value is a signed integer.
Integer(i64),
/// The value is a floating point number.
Real(f64),
/// The value is a text string.
Text(String),
/// The value is a blob of data
Blob(Vec<u8>),
}
#[cfg(test)]
#[cfg_attr(feature="clippy", allow(similar_names))]
mod test {
@ -111,6 +93,7 @@ mod test {
use Error;
use libc::{c_int, c_double};
use std::f64::EPSILON;
use super::Value;
fn checked_memory_handle() -> Connection {
let db = Connection::open_in_memory().unwrap();
@ -144,6 +127,17 @@ mod test {
fn test_str() {
let db = checked_memory_handle();
let s = "hello, world!";
db.execute("INSERT INTO foo(t) VALUES (?)", &[&s]).unwrap();
let from: String = db.query_row("SELECT t FROM foo", &[], |r| r.get(0)).unwrap();
assert_eq!(from, s);
}
#[test]
fn test_string() {
let db = checked_memory_handle();
let s = "hello, world!";
db.execute("INSERT INTO foo(t) VALUES (?)", &[&s.to_owned()]).unwrap();
@ -151,6 +145,16 @@ mod test {
assert_eq!(from, s);
}
#[test]
fn test_value() {
let db = checked_memory_handle();
db.execute("INSERT INTO foo(i) VALUES (?)", &[&Value::Integer(10)]).unwrap();
assert_eq!(10i64,
db.query_row("SELECT i FROM foo", &[], |r| r.get(0)).unwrap());
}
#[test]
fn test_option() {
let db = checked_memory_handle();

13
src/types/serde_json.rs
View File

@ -1,19 +1,15 @@
//! `ToSql` and `FromSql` implementation for JSON `Value`.
extern crate serde_json;
use libc::c_int;
use self::serde_json::Value;
use {Error, Result};
use types::{FromSql, ToSql, ValueRef};
use ffi::sqlite3_stmt;
use types::{FromSql, ToSql, ToSqlOutput, ValueRef};
/// Serialize JSON `Value` to text.
impl ToSql for Value {
unsafe fn bind_parameter(&self, stmt: *mut sqlite3_stmt, col: c_int) -> c_int {
let s = serde_json::to_string(self).unwrap();
s.bind_parameter(stmt, col)
fn to_sql(&self) -> Result<ToSqlOutput> {
Ok(ToSqlOutput::from(serde_json::to_string(self).unwrap()))
}
}
@ -24,7 +20,8 @@ impl FromSql for Value {
ValueRef::Text(ref s) => serde_json::from_str(s),
ValueRef::Blob(ref b) => serde_json::from_slice(b),
_ => return Err(Error::InvalidColumnType),
}.map_err(|err| Error::FromSqlConversionFailure(Box::new(err)))
}
.map_err(|err| Error::FromSqlConversionFailure(Box::new(err)))
}
}

11
src/types/time.rs
View File

@ -1,17 +1,14 @@
extern crate time;
use libc::c_int;
use {Error, Result};
use types::{FromSql, ToSql, ValueRef};
use ffi::sqlite3_stmt;
use types::{FromSql, ToSql, ToSqlOutput, ValueRef};
const SQLITE_DATETIME_FMT: &'static str = "%Y-%m-%d %H:%M:%S";
impl ToSql for time::Timespec {
unsafe fn bind_parameter(&self, stmt: *mut sqlite3_stmt, col: c_int) -> c_int {
let time_str = time::at_utc(*self).strftime(SQLITE_DATETIME_FMT).unwrap().to_string();
time_str.bind_parameter(stmt, col)
fn to_sql(&self) -> Result<ToSqlOutput> {
let time_string = time::at_utc(*self).strftime(SQLITE_DATETIME_FMT).unwrap().to_string();
Ok(ToSqlOutput::from(time_string))
}
}

132
src/types/to_sql.rs
View File

@ -1,95 +1,97 @@
use std::mem;
use super::{Null, Value, ValueRef};
use ::Result;
use libc::{c_double, c_int};
/// `ToSqlOutput` represents the possible output types for implementors of the `ToSql` trait.
pub enum ToSqlOutput<'a> {
/// A borrowed SQLite-representable value.
Borrowed(ValueRef<'a>),
use super::Null;
use ::{ffi, str_to_cstring};
use ffi::sqlite3_stmt;
/// An owned SQLite-representable value.
Owned(Value),
/// A BLOB of the given length that is filled with zeroes.
#[cfg(feature = "blob")]
ZeroBlob(i32),
}
impl<'a, T: ?Sized> From<&'a T> for ToSqlOutput<'a>
where &'a T: Into<ValueRef<'a>>
{
fn from(t: &'a T) -> Self {
ToSqlOutput::Borrowed(t.into())
}
}
impl<'a, T: Into<Value>> From<T> for ToSqlOutput<'a> {
fn from(t: T) -> Self {
ToSqlOutput::Owned(t.into())
}
}
/// A trait for types that can be converted into SQLite values.
pub trait ToSql {
unsafe fn bind_parameter(&self, stmt: *mut sqlite3_stmt, col: c_int) -> c_int;
fn to_sql(&self) -> Result<ToSqlOutput>;
}
macro_rules! raw_to_impl(
($t:ty, $f:ident) => (
// We should be able to use a generic impl like this:
//
// impl<T: Copy> ToSql for T where T: Into<Value> {
// fn to_sql(&self) -> Result<ToSqlOutput> {
// Ok(ToSqlOutput::from((*self).into()))
// }
// }
//
// instead of the following macro, but this runs afoul of
// https://github.com/rust-lang/rust/issues/30191 and reports conflicting
// implementations even when there aren't any.
macro_rules! to_sql_self(
($t:ty) => (
impl ToSql for $t {
unsafe fn bind_parameter(&self, stmt: *mut sqlite3_stmt, col: c_int) -> c_int {
ffi::$f(stmt, col, *self)
fn to_sql(&self) -> Result<ToSqlOutput> {
Ok(ToSqlOutput::from(*self))
}
}
)
);
raw_to_impl!(c_int, sqlite3_bind_int); // i32
raw_to_impl!(i64, sqlite3_bind_int64);
raw_to_impl!(c_double, sqlite3_bind_double);
to_sql_self!(Null);
to_sql_self!(bool);
to_sql_self!(i32);
to_sql_self!(i64);
to_sql_self!(f64);
impl ToSql for bool {
unsafe fn bind_parameter(&self, stmt: *mut sqlite3_stmt, col: c_int) -> c_int {
if *self {
ffi::sqlite3_bind_int(stmt, col, 1)
} else {
ffi::sqlite3_bind_int(stmt, col, 0)
}
}
}
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(),
length as c_int,
ffi::SQLITE_TRANSIENT())
}
Err(_) => ffi::SQLITE_MISUSE,
}
impl<'a, T: ?Sized> ToSql for &'a T
where &'a T: Into<ToSqlOutput<'a>>
{
fn to_sql(&self) -> Result<ToSqlOutput> {
Ok(ToSqlOutput::from((*self).into()))
}
}
impl ToSql for String {
unsafe fn bind_parameter(&self, stmt: *mut sqlite3_stmt, col: c_int) -> c_int {
(&self[..]).bind_parameter(stmt, col)
}
}
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())
fn to_sql(&self) -> Result<ToSqlOutput> {
Ok(ToSqlOutput::from(self.as_str()))
}
}
impl ToSql for Vec<u8> {
unsafe fn bind_parameter(&self, stmt: *mut sqlite3_stmt, col: c_int) -> c_int {
(&self[..]).bind_parameter(stmt, col)
fn to_sql(&self) -> Result<ToSqlOutput> {
Ok(ToSqlOutput::from(self.as_slice()))
}
}
impl ToSql for Value {
fn to_sql(&self) -> Result<ToSqlOutput> {
Ok(ToSqlOutput::from(self))
}
}
impl<T: ToSql> ToSql for Option<T> {
unsafe fn bind_parameter(&self, stmt: *mut sqlite3_stmt, col: c_int) -> c_int {
fn to_sql(&self) -> Result<ToSqlOutput> {
match *self {
None => ffi::sqlite3_bind_null(stmt, col),
Some(ref t) => t.bind_parameter(stmt, col),
None => Ok(ToSqlOutput::from(Null)),
Some(ref t) => t.to_sql(),
}
}
}
impl ToSql for Null {
unsafe fn bind_parameter(&self, stmt: *mut sqlite3_stmt, col: c_int) -> c_int {
ffi::sqlite3_bind_null(stmt, col)
}
}

61
src/types/value.rs Normal file
View File

@ -0,0 +1,61 @@
use super::Null;
/// Owning [dynamic type value](http://sqlite.org/datatype3.html). Value's type is typically
/// dictated by SQLite (not by the caller).
///
/// See [`ValueRef`](enum.ValueRef.html) for a non-owning dynamic type value.
#[derive(Clone,Debug,PartialEq)]
pub enum Value {
/// The value is a `NULL` value.
Null,
/// The value is a signed integer.
Integer(i64),
/// The value is a floating point number.
Real(f64),
/// The value is a text string.
Text(String),
/// The value is a blob of data
Blob(Vec<u8>),
}
impl From<Null> for Value {
fn from(_: Null) -> Value {
Value::Null
}
}
impl From<bool> for Value {
fn from(i: bool) -> Value {
Value::Integer(i as i64)
}
}
impl From<i32> for Value {
fn from(i: i32) -> Value {
Value::Integer(i as i64)
}
}
impl From<i64> for Value {
fn from(i: i64) -> Value {
Value::Integer(i)
}
}
impl From<f64> for Value {
fn from(f: f64) -> Value {
Value::Real(f)
}
}
impl From<String> for Value {
fn from(s: String) -> Value {
Value::Text(s)
}
}
impl From<Vec<u8>> for Value {
fn from(v: Vec<u8>) -> Value {
Value::Blob(v)
}
}

12
src/types/value_ref.rs
View File

@ -70,6 +70,18 @@ impl<'a> From<ValueRef<'a>> for Value {
}
}
impl<'a> From<&'a str> for ValueRef<'a> {
fn from(s: &str) -> ValueRef {
ValueRef::Text(s)
}
}
impl<'a> From<&'a [u8]> for ValueRef<'a> {
fn from(s: &[u8]) -> ValueRef {
ValueRef::Blob(s)
}
}
impl<'a> From<&'a Value> for ValueRef<'a> {
fn from(value: &'a Value) -> ValueRef<'a> {
match *value {