Trait diesel::sql_types::TypeMetadata

pub trait TypeMetadata {
    type TypeMetadata;
    type MetadataLookup: ?Sized;
}

Expand description

Information about how a backend stores metadata about given SQL types

Required Associated Types

The actual type used to represent metadata.

On PostgreSQL, this is the type’s OID. On MySQL and SQLite, this is an enum representing all storage classes they support.

The type used for runtime lookup of metadata.

For most backends, which don’t support user defined types, this will be ().