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use super::data_type::DataType;
use std::char::{decode_utf16, DecodeUtf16Error};
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum Nullability {
Unknown,
Nullable,
NoNulls,
}
impl Default for Nullability {
fn default() -> Self {
Nullability::Unknown
}
}
impl Nullability {
pub fn new(nullability: odbc_sys::Nullability) -> Self {
match nullability {
odbc_sys::Nullability::UNKNOWN => Nullability::Unknown,
odbc_sys::Nullability::NO_NULLS => Nullability::NoNulls,
odbc_sys::Nullability::NULLABLE => Nullability::Nullable,
other => panic!("ODBC returned invalid value for Nullable: {:?}", other),
}
}
}
#[derive(Clone, Debug, Eq, PartialEq, Default)]
pub struct ColumnDescription {
pub name: Vec<u16>,
pub data_type: DataType,
pub nullability: Nullability,
}
impl ColumnDescription {
pub fn name_to_string(&self) -> Result<String, DecodeUtf16Error> {
decode_utf16(self.name.iter().copied()).collect()
}
pub fn could_be_nullable(&self) -> bool {
match self.nullability {
Nullability::Nullable | Nullability::Unknown => true,
Nullability::NoNulls => false,
}
}
}