How can I know the number of affected rows when a mysql-phppdo object performs preprocessing?

In normal mode, $ pdo-& amp; gt; exec ($ SQL); can be used to return the number of affected rows. How can I know the number of affected rows if data is inserted to the pre-processed object? $ Stmt $ pdo-& amp; gt; prepare ($ SQL); $ stmt-& amp; gt; execute (); in normal mode, use $ pdo-> exec ($ SQL); the number of affected rows can be returned;

How can I know the number of affected rows if I insert and delete data in the pre-processing object?
$ Stmt = $ pdo-> prepare ($ SQL );
$ Stmt-> execute ();

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In normal mode, $ pdo-> exec ($ SQL); can be used to return the number of affected rows;

How can I know the number of affected rows if I insert and delete data in the pre-processing object?
$ Stmt = $ pdo-> prepare ($ SQL );
$ Stmt-> execute ();

$ Stmt = $ pdo-> prepare ($ SQL); $ stmt-> execute (); $ count = $ stmt-> rowCount (); // Delete the number of rows

PDOStatement: rowCount () returns the number of rows affected by the previous DELETE, INSERT, or UPDATE statement executed by the corresponding PDOStatement object.
If the previous SQL statement executed by the related PDOStatement is a SELECT statement, some data may return the number of rows returned by this statement. However, this method cannot ensure that it is effective for all data and should not be relied on by portable applications.