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Make Value::read take an immutable statement

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This commit is contained in:
Ivan Ukhov 2015-06-01 16:30:02 -04:00
parent 2e14e2055d
commit dd85dc01d7
1 changed files with 5 additions and 5 deletions
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10
src/statement.rs
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@ -20,7 +20,7 @@ pub enum Binding<'l> {
/// A value stored in a prepared statement. /// A value stored in a prepared statement.
pub trait Value { pub trait Value {
/// Read the value at a specific column. /// Read the value at a specific column.
fn read(statement: &mut Statement, i: usize) -> Result<Self>; fn read(statement: &Statement, i: usize) -> Result<Self>;
} }
impl<'l> Statement<'l> { impl<'l> Statement<'l> {
@ -51,7 +51,7 @@ impl<'l> Statement<'l> {
/// Return the value of a column. /// Return the value of a column.
#[inline] #[inline]
pub fn column<T: Value>(&mut self, i: usize) -> Result<T> { pub fn column<T: Value>(&self, i: usize) -> Result<T> {
<T as Value>::read(self, i) <T as Value>::read(self, i)
} }
@ -77,19 +77,19 @@ impl<'l> Drop for Statement<'l> {
} }
impl Value for f64 { impl Value for f64 {
fn read(statement: &mut Statement, i: usize) -> Result<f64> { fn read(statement: &Statement, i: usize) -> Result<f64> {
Ok(unsafe { ::raw::sqlite3_column_double(statement.raw, i as c_int) as f64 }) Ok(unsafe { ::raw::sqlite3_column_double(statement.raw, i as c_int) as f64 })
} }
} }
impl Value for i64 { impl Value for i64 {
fn read(statement: &mut Statement, i: usize) -> Result<i64> { fn read(statement: &Statement, i: usize) -> Result<i64> {
Ok(unsafe { ::raw::sqlite3_column_int64(statement.raw, i as c_int) as i64 }) Ok(unsafe { ::raw::sqlite3_column_int64(statement.raw, i as c_int) as i64 })
} }
} }
impl Value for String { impl Value for String {
fn read(statement: &mut Statement, i: usize) -> Result<String> { fn read(statement: &Statement, i: usize) -> Result<String> {
unsafe { unsafe {
let pointer = ::raw::sqlite3_column_text(statement.raw, i as c_int); let pointer = ::raw::sqlite3_column_text(statement.raw, i as c_int);
if pointer.is_null() { if pointer.is_null() {