Trait diesel::pg::PgMetadataLookup

source · [−]
pub trait PgMetadataLookup {
    fn lookup_type(
        &mut self,
        type_name: &str,
        schema: Option<&str>
    ) -> PgTypeMetadata;
}
Available on crate feature postgres_backend only.
Expand description

Determines the OID of types at runtime

Custom implementations of Connection<Backend = Pg> should not implement this trait directly. Instead GetPgMetadataCache should be implemented, afterwards the generic implementation will provide the necessary functions to perform the type lookup.

Required Methods

Determine the type metadata for the given type_name

This function should only be used for user defined types, or types which come from an extension. This function may perform a SQL query to look up the type. For built-in types, a static OID should be preferred.

Implementors