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use byteorder::{ReadBytesExt, WriteBytesExt, NetworkEndian};
use std::error::Error;
use std::fmt;
use std::io::Write;
use backend::Debug;
use pg::{Pg, PgTypeMetadata, PgMetadataLookup};
use query_source::Queryable;
use types::*;
impl<T> HasSqlType<Array<T>> for Pg where
Pg: HasSqlType<T>,
{
fn metadata(lookup: &PgMetadataLookup) -> PgTypeMetadata {
PgTypeMetadata {
oid: <Pg as HasSqlType<T>>::metadata(lookup).array_oid,
array_oid: 0,
}
}
}
impl<T> HasSqlType<Array<T>> for Debug where
Debug: HasSqlType<T>,
{
fn metadata(_: &()) {}
}
impl_query_id!(Array<T>);
impl<T> NotNull for Array<T> {
}
impl<T> SingleValue for Array<T> {
}
impl<T, ST> FromSql<Array<ST>, Pg> for Vec<T> where
T: FromSql<ST, Pg>,
Pg: HasSqlType<ST>,
{
fn from_sql(bytes: Option<&[u8]>) -> Result<Self, Box<Error+Send+Sync>> {
let mut bytes = not_none!(bytes);
let num_dimensions = try!(bytes.read_i32::<NetworkEndian>());
let has_null = try!(bytes.read_i32::<NetworkEndian>()) != 0;
let _oid = try!(bytes.read_i32::<NetworkEndian>());
if num_dimensions == 0 {
return Ok(Vec::new())
}
let num_elements = try!(bytes.read_i32::<NetworkEndian>());
let lower_bound = try!(bytes.read_i32::<NetworkEndian>());
assert_eq!(num_dimensions, 1, "multi-dimensional arrays are not supported");
assert_eq!(lower_bound, 1, "lower bound must be 1");
(0..num_elements).map(|_| {
let elem_size = try!(bytes.read_i32::<NetworkEndian>());
if has_null && elem_size == -1 {
T::from_sql(None)
} else {
let (elem_bytes, new_bytes) = bytes.split_at(elem_size as usize);
bytes = new_bytes;
T::from_sql(Some(elem_bytes))
}
}).collect()
}
}
impl<T, ST> FromSqlRow<Array<ST>, Pg> for Vec<T> where
Pg: HasSqlType<ST>,
Vec<T>: FromSql<Array<ST>, Pg>,
{
fn build_from_row<R: ::row::Row<Pg>>(row: &mut R) -> Result<Self, Box<Error+Send+Sync>> {
FromSql::<Array<ST>, Pg>::from_sql(row.take())
}
}
#[cfg(not(feature="unstable"))]
impl<T, ST> FromSqlRow<Nullable<Array<ST>>, Pg> for Option<Vec<T>> where
Pg: HasSqlType<ST>,
Option<Vec<T>>: FromSql<Nullable<Array<ST>>, Pg>,
{
fn build_from_row<R: ::row::Row<Pg>>(row: &mut R) -> Result<Self, Box<Error+Send+Sync>> {
FromSql::<Nullable<Array<ST>>, Pg>::from_sql(row.take())
}
}
impl<T, ST> Queryable<Array<ST>, Pg> for Vec<T> where
T: FromSql<ST, Pg> + Queryable<ST, Pg>,
Pg: HasSqlType<ST>,
{
type Row = Self;
fn build(row: Self) -> Self {
row
}
}
use expression::AsExpression;
use expression::bound::Bound;
macro_rules! array_as_expression {
($ty:ty, $sql_type:ty) => {
impl<'a, 'b, ST, T> AsExpression<$sql_type> for $ty where
Pg: HasSqlType<ST>,
{
type Expression = Bound<$sql_type, Self>;
fn as_expression(self) -> Self::Expression {
Bound::new(self)
}
}
}
}
array_as_expression!(&'a [T], Array<ST>);
array_as_expression!(&'a [T], Nullable<Array<ST>>);
array_as_expression!(&'a &'b [T], Array<ST>);
array_as_expression!(&'a &'b [T], Nullable<Array<ST>>);
array_as_expression!(Vec<T>, Array<ST>);
array_as_expression!(Vec<T>, Nullable<Array<ST>>);
array_as_expression!(&'a Vec<T>, Array<ST>);
array_as_expression!(&'a Vec<T>, Nullable<Array<ST>>);
impl<'a, ST, T> ToSql<Array<ST>, Pg> for &'a [T] where
Pg: HasSqlType<ST>,
T: ToSql<ST, Pg>,
{
fn to_sql<W: Write>(&self, out: &mut ToSqlOutput<W, Pg>) -> Result<IsNull, Box<Error+Send+Sync>> {
let num_dimensions = 1;
try!(out.write_i32::<NetworkEndian>(num_dimensions));
let flags = 0;
try!(out.write_i32::<NetworkEndian>(flags));
let element_oid = Pg::metadata(out.metadata_lookup()).oid;
try!(out.write_u32::<NetworkEndian>(element_oid));
try!(out.write_i32::<NetworkEndian>(self.len() as i32));
let lower_bound = 1;
try!(out.write_i32::<NetworkEndian>(lower_bound));
let mut buffer = out.with_buffer(Vec::new());
for elem in self.iter() {
let is_null = try!(elem.to_sql(&mut buffer));
if let IsNull::No = is_null {
try!(out.write_i32::<NetworkEndian>(buffer.len() as i32));
try!(out.write_all(&buffer));
buffer.clear();
} else {
try!(out.write_i32::<NetworkEndian>(-1));
}
}
Ok(IsNull::No)
}
}
impl<'a, ST, T> ToSql<Nullable<Array<ST>>, Pg> for &'a [T] where
Pg: HasSqlType<ST>,
&'a [T]: ToSql<Array<ST>, Pg>,
{
fn to_sql<W: Write>(&self, out: &mut ToSqlOutput<W, Pg>) -> Result<IsNull, Box<Error+Send+Sync>> {
ToSql::<Array<ST>, Pg>::to_sql(self, out)
}
}
impl<ST, T> ToSql<Array<ST>, Pg> for Vec<T> where
Pg: HasSqlType<ST>,
for<'a> &'a [T]: ToSql<Array<ST>, Pg>,
T: fmt::Debug,
{
fn to_sql<W: Write>(&self, out: &mut ToSqlOutput<W, Pg>) -> Result<IsNull, Box<Error+Send+Sync>> {
(self as &[T]).to_sql(out)
}
}
impl<ST, T> ToSql<Nullable<Array<ST>>, Pg> for Vec<T> where
Pg: HasSqlType<ST>,
Vec<T>: ToSql<Array<ST>, Pg>,
{
fn to_sql<W: Write>(&self, out: &mut ToSqlOutput<W, Pg>) -> Result<IsNull, Box<Error+Send+Sync>> {
ToSql::<Array<ST>, Pg>::to_sql(self, out)
}
}