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

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,