Enum lunatic_diesel::connection::statement_cache::StatementCacheKey

pub enum StatementCacheKey<DB>where
    DB: Backend,{
    Type(TypeId),
    Sql {
        sql: String,
        bind_types: Vec<<DB as TypeMetadata>::TypeMetadata, Global>,
    },
}

The lookup key used by StatementCache internally

This can contain either a at compile time known type id (representing a statically known query) or a at runtime calculated query string + parameter types (for queries that may change depending on their parameters)

Variants

Type(TypeId)

Represents a at compile time known query

Calculated via QueryId::QueryId

Sql

Fields

sql: String

contains the sql query string

bind_types: Vec<<DB as TypeMetadata>::TypeMetadata, Global>

contains the types of any bind parameter passed to the query

Represents a dynamically constructed query

This variant is used if QueryId::HAS_STATIC_QUERY_ID is false and AstPass::unsafe_to_cache_prepared is not called for a given query.

Implementations

impl<DB> StatementCacheKey<DB>where
    DB: Backend,
    <DB as Backend>::QueryBuilder: Default,
    <DB as TypeMetadata>::TypeMetadata: Clone,

pub fn for_source<T>(
    source: &T,
    bind_types: &[<DB as TypeMetadata>::TypeMetadata],
    backend: &DB
) -> Result<StatementCacheKey<DB>, Error>where
    T: QueryFragment<DB, NotSpecialized> + QueryId,

Create a new statement cache key for the given query source

pub fn sql<T>(&self, source: &T, backend: &DB) -> Result<Cow<'_, str>, Error>where
    T: QueryFragment<DB, NotSpecialized>,

Get the sql for a given query source based

This is an optimization that may skip constructing the query string twice if it’s already part of the current cache key

Trait Implementations

impl<DB> Hash for StatementCacheKey<DB>where
    DB: Hash + Backend,
    <DB as TypeMetadata>::TypeMetadata: Hash,

fn hash<__H>(&self, state: &mut __H)where
    __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where
    H: Hasher,
    Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<DB> PartialEq<StatementCacheKey<DB>> for StatementCacheKey<DB>where
    DB: PartialEq<DB> + Backend,
    <DB as TypeMetadata>::TypeMetadata: PartialEq<<DB as TypeMetadata>::TypeMetadata>,

fn eq(&self, other: &StatementCacheKey<DB>) -> bool

This method tests for self and other values to be equal, and is used by ==.

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

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

impl<DB> Eq for StatementCacheKey<DB>where
    DB: Eq + Backend,
    <DB as TypeMetadata>::TypeMetadata: Eq,

impl<DB> StructuralEq for StatementCacheKey<DB>where
    DB: Backend,

impl<DB> StructuralPartialEq for StatementCacheKey<DB>where
    DB: Backend,