Function find_in_db 

fn find_in_db(
    table: &DB,
    column_name: &str,
    value: &str,
) -> Option<(usize, usize)>

Finds the first row with a value in a column of a table.

If the column is localised, it’s not in the table’s data, so the first key column is searched instead.

Returns

The column and row indexes of the row.