use crate::row::sealed::{AsName, Sealed};
use crate::simple_query::SimpleColumn;
use crate::statement::Column;
use crate::types::{FromSql, Type, WrongType};
use crate::{Error, Statement};
use fallible_iterator::FallibleIterator;
use postgres_protocol::message::backend::DataRowBody;
use std::fmt;
use std::ops::Range;
use std::str;
use std::sync::Arc;
mod sealed {
pub trait Sealed {}
pub trait AsName {
fn as_name(&self) -> &str;
}
}
impl AsName for Column {
fn as_name(&self) -> &str {
self.name()
}
}
impl AsName for String {
fn as_name(&self) -> &str {
self
}
}
pub trait RowIndex: Sealed {
#[doc(hidden)]
fn __idx<T>(&self, columns: &[T]) -> Option<usize>
where
T: AsName;
}
impl Sealed for usize {}
impl RowIndex for usize {
#[inline]
fn __idx<T>(&self, columns: &[T]) -> Option<usize>
where
T: AsName,
{
if *self >= columns.len() {
None
} else {
Some(*self)
}
}
}
impl Sealed for str {}
impl RowIndex for str {
#[inline]
fn __idx<T>(&self, columns: &[T]) -> Option<usize>
where
T: AsName,
{
if let Some(idx) = columns.iter().position(|d| d.as_name() == self) {
return Some(idx);
};
columns
.iter()
.position(|d| d.as_name().eq_ignore_ascii_case(self))
}
}
impl<'a, T> Sealed for &'a T where T: ?Sized + Sealed {}
impl<'a, T> RowIndex for &'a T
where
T: ?Sized + RowIndex,
{
#[inline]
fn __idx<U>(&self, columns: &[U]) -> Option<usize>
where
U: AsName,
{
T::__idx(*self, columns)
}
}
#[derive(Clone)]
pub struct Row {
statement: Statement,
body: DataRowBody,
ranges: Vec<Option<Range<usize>>>,
}
impl fmt::Debug for Row {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("Row")
.field("columns", &self.columns())
.finish()
}
}
impl Row {
pub(crate) fn new(statement: Statement, body: DataRowBody) -> Result<Row, Error> {
let ranges = body.ranges().collect().map_err(Error::parse)?;
Ok(Row {
statement,
body,
ranges,
})
}
pub fn columns(&self) -> &[Column] {
self.statement.columns()
}
pub fn is_empty(&self) -> bool {
self.len() == 0
}
pub fn len(&self) -> usize {
self.columns().len()
}
#[track_caller]
pub fn get<'a, I, T>(&'a self, idx: I) -> T
where
I: RowIndex + fmt::Display,
T: FromSql<'a>,
{
match self.get_inner(&idx) {
Ok(ok) => ok,
Err(err) => panic!("error retrieving column {}: {}", idx, err),
}
}
pub fn try_get<'a, I, T>(&'a self, idx: I) -> Result<T, Error>
where
I: RowIndex + fmt::Display,
T: FromSql<'a>,
{
self.get_inner(&idx)
}
fn get_inner<'a, I, T>(&'a self, idx: &I) -> Result<T, Error>
where
I: RowIndex + fmt::Display,
T: FromSql<'a>,
{
let idx = match idx.__idx(self.columns()) {
Some(idx) => idx,
None => return Err(Error::column(idx.to_string())),
};
let ty = self.columns()[idx].type_();
if !T::accepts(ty) {
return Err(Error::from_sql(
Box::new(WrongType::new::<T>(ty.clone())),
idx,
));
}
FromSql::from_sql_nullable(ty, self.col_buffer(idx)).map_err(|e| Error::from_sql(e, idx))
}
fn col_buffer(&self, idx: usize) -> Option<&[u8]> {
let range = self.ranges[idx].to_owned()?;
Some(&self.body.buffer()[range])
}
}
impl AsName for SimpleColumn {
fn as_name(&self) -> &str {
self.name()
}
}
#[derive(Debug)]
pub struct SimpleQueryRow {
columns: Arc<[SimpleColumn]>,
body: DataRowBody,
ranges: Vec<Option<Range<usize>>>,
}
impl SimpleQueryRow {
#[allow(clippy::new_ret_no_self)]
pub(crate) fn new(
columns: Arc<[SimpleColumn]>,
body: DataRowBody,
) -> Result<SimpleQueryRow, Error> {
let ranges = body.ranges().collect().map_err(Error::parse)?;
Ok(SimpleQueryRow {
columns,
body,
ranges,
})
}
pub fn columns(&self) -> &[SimpleColumn] {
&self.columns
}
pub fn is_empty(&self) -> bool {
self.len() == 0
}
pub fn len(&self) -> usize {
self.columns.len()
}
#[track_caller]
pub fn get<I>(&self, idx: I) -> Option<&str>
where
I: RowIndex + fmt::Display,
{
match self.get_inner(&idx) {
Ok(ok) => ok,
Err(err) => panic!("error retrieving column {}: {}", idx, err),
}
}
pub fn try_get<I>(&self, idx: I) -> Result<Option<&str>, Error>
where
I: RowIndex + fmt::Display,
{
self.get_inner(&idx)
}
fn get_inner<I>(&self, idx: &I) -> Result<Option<&str>, Error>
where
I: RowIndex + fmt::Display,
{
let idx = match idx.__idx(&self.columns) {
Some(idx) => idx,
None => return Err(Error::column(idx.to_string())),
};
let buf = self.ranges[idx].clone().map(|r| &self.body.buffer()[r]);
FromSql::from_sql_nullable(&Type::TEXT, buf).map_err(|e| Error::from_sql(e, idx))
}
}