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use Queriable;
use db_result::DbResult;
use types::{NativeSqlType, FromSqlRow};
use std::marker::PhantomData;
pub struct Cursor<ST, T> {
current_row: usize,
db_result: DbResult,
_marker: PhantomData<(ST, T)>,
}
impl<ST, T> Cursor<ST, T> {
#[doc(hidden)]
pub fn new(db_result: DbResult) -> Self {
Cursor {
current_row: 0,
db_result: db_result,
_marker: PhantomData,
}
}
}
impl<ST, T> Iterator for Cursor<ST, T> where
ST: NativeSqlType,
T: Queriable<ST>,
{
type Item = T;
fn next(&mut self) -> Option<T> {
if self.current_row >= self.db_result.num_rows() {
None
} else {
let mut row = self.db_result.get_row(self.current_row);
self.current_row += 1;
let values = match T::Row::build_from_row(&mut row) {
Ok(value) => value,
Err(reason) => panic!("Error reading values {}", reason.description()),
};
let result = T::build(values);
Some(result)
}
}
}