Trait diesel::sql_types::TypeMetadata

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pub trait TypeMetadata {
    type TypeMetadata;
    type MetadataLookup;
}

[−] Expand description

Information about how a backend stores metadata about given SQL types

Associated Types

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.

type MetadataLookup[−]

The type used for runtime lookup of metadata.

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

Implementors

• impl TypeMetadata for Mysql type TypeMetadata = MysqlType; type MetadataLookup = ();

• impl TypeMetadata for Pg type TypeMetadata = PgTypeMetadata; type MetadataLookup = PgMetadataLookup;

• impl TypeMetadata for Sqlite type TypeMetadata = SqliteType; type MetadataLookup = ();