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use byteorder::{ByteOrder, LittleEndian};
use crate::decode::Decode;
use crate::encode::{Encode, IsNull};
use crate::error::BoxDynError;
use crate::mysql::protocol::text::ColumnType;
use crate::mysql::{MySql, MySqlTypeInfo, MySqlValueFormat, MySqlValueRef};
use crate::types::Type;
fn real_compatible(ty: &MySqlTypeInfo) -> bool {
matches!(ty.r#type, ColumnType::Float | ColumnType::Double)
}
impl Type<MySql> for f32 {
fn type_info() -> MySqlTypeInfo {
MySqlTypeInfo::binary(ColumnType::Float)
}
fn compatible(ty: &MySqlTypeInfo) -> bool {
real_compatible(ty)
}
}
impl Type<MySql> for f64 {
fn type_info() -> MySqlTypeInfo {
MySqlTypeInfo::binary(ColumnType::Double)
}
fn compatible(ty: &MySqlTypeInfo) -> bool {
real_compatible(ty)
}
}
impl Encode<'_, MySql> for f32 {
fn encode_by_ref(&self, buf: &mut Vec<u8>) -> IsNull {
buf.extend(&self.to_le_bytes());
IsNull::No
}
}
impl Encode<'_, MySql> for f64 {
fn encode_by_ref(&self, buf: &mut Vec<u8>) -> IsNull {
buf.extend(&self.to_le_bytes());
IsNull::No
}
}
impl Decode<'_, MySql> for f32 {
fn decode(value: MySqlValueRef<'_>) -> Result<Self, BoxDynError> {
Ok(match value.format() {
MySqlValueFormat::Binary => {
let buf = value.as_bytes()?;
if buf.len() == 8 {
LittleEndian::read_f64(buf) as f32
} else {
LittleEndian::read_f32(buf)
}
}
MySqlValueFormat::Text => value.as_str()?.parse()?,
})
}
}
impl Decode<'_, MySql> for f64 {
fn decode(value: MySqlValueRef<'_>) -> Result<Self, BoxDynError> {
Ok(match value.format() {
MySqlValueFormat::Binary => LittleEndian::read_f64(value.as_bytes()?),
MySqlValueFormat::Text => value.as_str()?.parse()?,
})
}
}