sqlx-exasol-impl 0.9.2

Driver implementation for sqlx-exasol. Not meant to be used directly.
Documentation 
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use serde::{Deserialize, Serialize};
use sqlx_core::{
    decode::Decode,
    encode::{Encode, IsNull},
    error::BoxDynError,
    types::{Json, Type},
};

use crate::{
    arguments::ExaBuffer,
    type_info::{Charset, ExaDataType},
    types::ExaHasArrayType,
    ExaTypeInfo, ExaValueRef, Exasol,
};

impl<T> Type<Exasol> for Json<T> {
    fn type_info() -> ExaTypeInfo {
        ExaDataType::Varchar {
            size: ExaDataType::VARCHAR_MAX_LEN,
            character_set: Charset::Utf8,
        }
        .into()
    }
}

impl<T> ExaHasArrayType for Json<T> {}

impl<T> Encode<'_, Exasol> for Json<T>
where
    T: Serialize,
{
    fn encode_by_ref(&self, buf: &mut ExaBuffer) -> Result<IsNull, BoxDynError> {
        buf.append_json(&self.0)?;
        Ok(IsNull::No)
    }
}

impl<'r, T> Decode<'r, Exasol> for Json<T>
where
    T: 'r + Deserialize<'r>,
{
    fn decode(value: ExaValueRef<'r>) -> Result<Self, BoxDynError> {
        <&str>::deserialize(value.value)
            .and_then(serde_json::from_str)
            .map(Json)
            .map_err(From::from)
    }
}