Function google_cloud_spanner::mutation::insert_or_update

pub fn insert_or_update<T, C>(
    table: T, 
    columns: Vec<C>, 
    values: Vec<Kind>
) -> Mutation where
    T: Into<String>,
    C: Into<String>, 

insert_or_update returns a Mutation to insert a row into a table. If the row already exists, it updates it instead. Any column values not explicitly written are preserved.

For a similar example, See update.