4 #[derive(Copy, Clone, Debug, PartialEq)]
5 pub enum ValueRef<'a> {
13 impl<'a> ValueRef<'a> {
14 pub fn as_str(&self) -> FromSqlResult<&'a str, &'a &'a str> {
16 ValueRef::Text(t) => {
17 std::str::from_utf8(t).map_err(|_| FromSqlError::InvalidType).map(|x| (x, &x))
19 _ => Err(FromSqlError::InvalidType),
26 pub enum FromSqlError {
30 impl fmt::Display for FromSqlError {
31 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
32 write!(f, "InvalidType")
36 impl Error for FromSqlError {}
38 pub type FromSqlResult<T, K> = Result<(T, K), FromSqlError>;
40 pub trait FromSql: Sized {
41 fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self, &Self>;
44 impl FromSql for &str {
45 fn column_result(value: ValueRef<'_>) -> FromSqlResult<&str, &&str> {
46 //~^ ERROR `impl` item signature doesn't match `trait` item signature
52 println!("{}", "Hello World");