Method decode

src/sql-server-util/src/desc.rs:717–977

Decode the column with `name` out of the provided `data`.

(
        &self,
        data: &'a tiberius::Row,
        name: &'a str,
        column: &'a SqlColumnType,
        arena: &'a RowArena,
    )

impl SqlServerColumnDecodeType {
    /// Decode the column with `name` out of the provided `data`.
    pub fn decode<'a>(
        &self,
        data: &'a tiberius::Row,
        name: &'a str,
        column: &'a SqlColumnType,
        arena: &'a RowArena,
    ) -> Result<Datum<'a>, SqlServerDecodeError> {
        let maybe_datum = match (&column.scalar_type, self) {
            (SqlScalarType::Bool, SqlServerColumnDecodeType::Bool) => data
                .try_get(name)
                .map_err(|_| SqlServerDecodeError::invalid_column(name, "bool"))?
                .map(|val: bool| if val { Datum::True } else { Datum::False }),
            (SqlScalarType::Int16, SqlServerColumnDecodeType::U8) => data
                .try_get(name)
                .map_err(|_| SqlServerDecodeError::invalid_column(name, "u8"))?
                .map(|val: u8| Datum::Int16(i16::cast_from(val))),
            (SqlScalarType::Int16, SqlServerColumnDecodeType::I16) => data
                .try_get(name)
                .map_err(|_| SqlServerDecodeError::invalid_column(name, "i16"))?
                .map(Datum::Int16),
            (SqlScalarType::Int32, SqlServerColumnDecodeType::I32) => data
                .try_get(name)
                .map_err(|_| SqlServerDecodeError::invalid_column(name, "i32"))?
                .map(Datum::Int32),
            (SqlScalarType::Int64, SqlServerColumnDecodeType::I64) => data
                .try_get(name)
                .map_err(|_| SqlServerDecodeError::invalid_column(name, "i64"))?
                .map(Datum::Int64),
            (SqlScalarType::Float32, SqlServerColumnDecodeType::F32) => data
                .try_get(name)
                .map_err(|_| SqlServerDecodeError::invalid_column(name, "f32"))?
                .map(|val: f32| Datum::Float32(ordered_float::OrderedFloat(val))),
            (SqlScalarType::Float64, SqlServerColumnDecodeType::F64) => data
                .try_get(name)
                .map_err(|_| SqlServerDecodeError::invalid_column(name, "f64"))?
                .map(|val: f64| Datum::Float64(ordered_float::OrderedFloat(val))),
            (SqlScalarType::String, SqlServerColumnDecodeType::String) => data
                .try_get(name)
                .map_err(|_| SqlServerDecodeError::invalid_column(name, "string"))?
                .map(Datum::String),
            (SqlScalarType::Char { length }, SqlServerColumnDecodeType::String) => data
                .try_get(name)
                .map_err(|_| SqlServerDecodeError::invalid_column(name, "char"))?
                .map(|val: &str| match length {
                    Some(expected) => {
                        let found_chars = val.chars().count();
                        let expct_chars = usize::cast_from(expected.into_u32());
                        if found_chars != expct_chars {
                            Err(SqlServerDecodeError::invalid_char(
                                name,
                                expct_chars,
                                found_chars,
                            ))
                        } else {
                            Ok(Datum::String(val))
                        }
                    }
                    None => Ok(Datum::String(val)),