Struct MysqlWarning 

pub struct MysqlWarning {
    pub level: &'static str,
    pub code: u16,
    pub message: String,
}

CoW-1 (v7.34) — frozen view of the persisted committed engine state. Carries every field the snapshot() envelope serializes; v7.39 (round 279) — the per-CONNECTION state, parked while another connection holds the engine.

The server runs ONE shared Engine behind a RwLock (ServerState.engine, built once at startup), so everything the engine called “session state” was in fact process-wide and leaked between clients: two connections saw each other’s prepared statements, and one client’s SET sql_mode re-dialected another’s string literals. PG scopes all of this per session.

Rather than thread a session handle through every call site, the engine keeps the ACTIVE session’s state in its own fields — so the ~40 existing self.session_params / self.backslash_escapes uses are untouched — and swaps the whole bag when the caller announces a different session. Embedded hosts never announce one and stay on session 0 forever, exactly as before. v7.38.18 (C12) — one row of MySQL’s diagnostics area.

The three columns SHOW WARNINGS returns, and the numbers are MySQL’s own: 1265 for a truncated value, 1366 for an integer column given something that is not one. Measured on 9.7.2 rather than looked up, because an errno a client switches on has to be the errno it would have seen.

Fields

level: &'static str

Warning, Error or Note — the Level column.

code: u16

MySQL’s error code.

message: String

The message, worded as MySQL words it.

Trait Implementations

impl Clone for MysqlWarning

fn clone(&self) -> MysqlWarning

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for MysqlWarning

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for MysqlWarning

impl PartialEq for MysqlWarning

fn eq(&self, other: &MysqlWarning) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for MysqlWarning