Trait TypeChecking

pub trait TypeChecking: Database {
    const PARAM_CHECKING: ParamChecking;

    // Required methods
    fn param_type_for_id(id: &Self::TypeInfo) -> Option<&'static str>;
    fn return_type_for_id(id: &Self::TypeInfo) -> Option<&'static str>;
    fn get_feature_gate(info: &Self::TypeInfo) -> Option<&'static str>;
    fn fmt_value_debug(value: &<Self as Database>::Value) -> FmtValue<'_, Self>;
}

Type-checking extensions for the Database trait.

Mostly supporting code for the macros, and for Debug impls.

Required Associated Constants

const PARAM_CHECKING: ParamChecking

Describes how the database in question typechecks query parameters.

Required Methods

fn param_type_for_id(id: &Self::TypeInfo) -> Option<&'static str>

Get the full path of the Rust type that corresponds to the given TypeInfo, if applicable.

If the type has a borrowed equivalent suitable for query parameters, this is that borrowed type.

fn return_type_for_id(id: &Self::TypeInfo) -> Option<&'static str>

Get the full path of the Rust type that corresponds to the given TypeInfo, if applicable.

Always returns the owned version of the type, suitable for decoding from Row.

fn get_feature_gate(info: &Self::TypeInfo) -> Option<&'static str>

Get the name of the Cargo feature gate that must be enabled to process the given TypeInfo, if applicable.

fn fmt_value_debug(value: &<Self as Database>::Value) -> FmtValue<'_, Self>

If value is a well-known type, decode and format it using Debug.

If value is not a well-known type or could not be decoded, the reason is printed instead.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors