Trait StatementCacheStrategy 

pub trait StatementCacheStrategy<DB, Statement>: Send + 'static
where
    DB: Backend,
    StatementCacheKey<DB>: Hash + Eq,
{
    // Required methods
    fn cache_size(&self) -> CacheSize;
    fn lookup_statement(
        &mut self,
        key: StatementCacheKey<DB>,
    ) -> LookupStatementResult<'_, DB, Statement>;
}

Available on crate feature i-implement-a-third-party-backend-and-opt-into-breaking-changes only.

Implement this trait, in order to control statement caching.

Required Methods

fn cache_size(&self) -> CacheSize

Returns which prepared statement cache size is implemented by this trait

fn lookup_statement( &mut self, key: StatementCacheKey<DB>, ) -> LookupStatementResult<'_, DB, Statement>

Returns whether or not the corresponding cache key is already cached

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl<DB, Statement> StatementCacheStrategy<DB, Statement> for WithCacheStrategy<DB, Statement>

where DB: Backend + 'static, StatementCacheKey<DB>: Hash + Eq, DB::TypeMetadata: Send + Clone, DB::QueryBuilder: Default, Statement: Send + 'static,

impl<DB, Statement> StatementCacheStrategy<DB, Statement> for WithoutCacheStrategy

where DB: Backend, StatementCacheKey<DB>: Hash + Eq, DB::TypeMetadata: Clone, DB::QueryBuilder: Default, Statement: 'static,