Struct PrepareContext 

pub struct PrepareContext { /* private fields */ }

Captures connection settings at statement preparation time for cache invalidation.

This struct is used to detect when a cached prepared statement needs to be recompiled because relevant connection settings have changed. When matches_connection() returns false, the statement will be automatically reprepared before execution.

Adding New Fields

If you add a new setting to Connection that affects statement compilation or execution, When adding a new connection setting that affects query compilation, you MUST call bump_prepare_context_generation() in its setter so that prepared statements know they need to be reprepared.

Implementations

impl PrepareContext

pub fn from_connection(connection: &Connection) -> Self

pub fn matches_connection(&self, connection: &Connection) -> bool

Trait Implementations

impl Clone for PrepareContext

fn clone(&self) -> PrepareContext

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PrepareContext

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

Formats the value using the given formatter.

impl PartialEq for PrepareContext

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for PrepareContext

impl StructuralPartialEq for PrepareContext