The method num_rows() is only useful for determining the number of rows retrieved by a SELECT query. But to retrieve the number of rows affected by INSERT, UPDATE, or DELETE query, use affected_rows().
When the query() method is looped repeatedly it comes at a cost of both overhead, because of the need to repeatedly parsing of the almost identical query for validity, and coding convenience, because of the need to repeatedly reconfigure the query using the new values for each iteration. To help resolve the issues incurred by repeatedly executed queries, MySQL introduced prepared statements.
Once the statement has been prepared, it needs to be executed. Exactly when it’s executed depends upon whether you want to work with bound parameters or bound results. In the case of bound parameters, you’d execute the statement after the parameters have been bound with the bind_param() method.
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