Trait diesel::sql_types::TypeMetadata

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

Information about how a backend stores metadata about given SQL types

Required Associated Types§

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type TypeMetadata

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.

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type MetadataLookup: ?Sized

The type used for runtime lookup of metadata.

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

Implementors§