Method from_sql_nullable

tank-postgres/src/value_wrap.rs:40–45

(
        ty: &Type,
        raw: Option<&'a [u8]>,
    )

    fn from_sql_null(ty: &Type) -> Result<Self, Box<dyn Error + Sync + Send>> {
        Self::from_sql_nullable(ty, None)
    }
    fn from_sql_nullable(
        ty: &Type,
        raw: Option<&'a [u8]>,
    ) -> Result<Self, Box<dyn Error + Sync + Send>> {
        extract_value(ty, raw).map(Into::into)
    }

    fn accepts(_ty: &Type) -> bool {