sqlx-core 0.3.5

Core of SQLx, the rust SQL toolkit. Not intended to be used directly.
Documentation 
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use std::error::Error as StdError;
use std::fmt::{self, Display};

use crate::error::DatabaseError;
use crate::mysql::protocol::ErrPacket;

#[derive(Debug)]
pub struct MySqlError(pub(super) ErrPacket);

impl Display for MySqlError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.pad(self.message())
    }
}

impl DatabaseError for MySqlError {
    fn message(&self) -> &str {
        &*self.0.error_message
    }

    fn code(&self) -> Option<&str> {
        self.0.sql_state.as_deref()
    }

    fn as_ref_err(&self) -> &(dyn StdError + Send + Sync + 'static) {
        self
    }

    fn as_mut_err(&mut self) -> &mut (dyn StdError + Send + Sync + 'static) {
        self
    }

    fn into_box_err(self: Box<Self>) -> Box<dyn StdError + Send + Sync + 'static> {
        self
    }
}

impl StdError for MySqlError {}

impl From<MySqlError> for crate::Error {
    fn from(err: MySqlError) -> Self {
        crate::Error::Database(Box::new(err))
    }
}

#[test]
fn test_error_downcasting() {
    let error = MySqlError(ErrPacket {
        error_code: 0xABCD,
        sql_state: None,
        error_message: "".into(),
    });

    let error = crate::Error::from(error);

    let db_err = match error {
        crate::Error::Database(db_err) => db_err,
        e => panic!("expected crate::Error::Database, got {:?}", e),
    };

    assert_eq!(db_err.downcast_ref::<MySqlError>().0.error_code, 0xABCD);
    assert_eq!(db_err.downcast::<MySqlError>().0.error_code, 0xABCD);
}