Function insert 

pub async fn insert<'e, E, DB, D, Ex>(
    dialect: &D,
    executor: Ex,
    entity: &E,
) -> Result<E, FletchError>
where
    E: Entity + for<'r> FromRow<'r, <DB as Database>::Row> + Send + Unpin,
    D: Dialect,
    DB: Database + DatabaseBindable,
    Ex: Executor<'e, Database = DB> + Send,

Insert a new entity and return it.

The id column is excluded from the INSERT statement so that the database can assign an autoincrement primary key. On engines without RETURNING, the inserted row is re-selected via LAST_INSERT_ID().