diesel/pg/types/
integers.rs

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use byteorder::{NetworkEndian, ReadBytesExt, WriteBytesExt};
use std::io::prelude::*;

use deserialize::{self, FromSql};
use pg::Pg;
use serialize::{self, IsNull, Output, ToSql};
use sql_types;

impl FromSql<sql_types::Oid, Pg> for u32 {
    fn from_sql(bytes: Option<&[u8]>) -> deserialize::Result<Self> {
        let mut bytes = not_none!(bytes);
        bytes.read_u32::<NetworkEndian>().map_err(|e| e.into())
    }
}

impl ToSql<sql_types::Oid, Pg> for u32 {
    fn to_sql<W: Write>(&self, out: &mut Output<W, Pg>) -> serialize::Result {
        out.write_u32::<NetworkEndian>(*self)
            .map(|_| IsNull::No)
            .map_err(|e| e.into())
    }
}

#[test]
fn i16_to_sql() {
    let mut bytes = Output::test();
    ToSql::<sql_types::SmallInt, Pg>::to_sql(&1i16, &mut bytes).unwrap();
    ToSql::<sql_types::SmallInt, Pg>::to_sql(&0i16, &mut bytes).unwrap();
    ToSql::<sql_types::SmallInt, Pg>::to_sql(&-1i16, &mut bytes).unwrap();
    assert_eq!(bytes, vec![0, 1, 0, 0, 255, 255]);
}

#[test]
fn i32_to_sql() {
    let mut bytes = Output::test();
    ToSql::<sql_types::Integer, Pg>::to_sql(&1i32, &mut bytes).unwrap();
    ToSql::<sql_types::Integer, Pg>::to_sql(&0i32, &mut bytes).unwrap();
    ToSql::<sql_types::Integer, Pg>::to_sql(&-1i32, &mut bytes).unwrap();
    assert_eq!(bytes, vec![0, 0, 0, 1, 0, 0, 0, 0, 255, 255, 255, 255]);
}

#[test]
fn i64_to_sql() {
    let mut bytes = Output::test();
    ToSql::<sql_types::BigInt, Pg>::to_sql(&1i64, &mut bytes).unwrap();
    ToSql::<sql_types::BigInt, Pg>::to_sql(&0i64, &mut bytes).unwrap();
    ToSql::<sql_types::BigInt, Pg>::to_sql(&-1i64, &mut bytes).unwrap();
    assert_eq!(
        bytes,
        vec![
            0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 255, 255, 255, 255, 255, 255, 255, 255,
        ]
    );
}