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並前往https://docs.oracle.com/cd/E17952_01/connector-python-en/connector-python-api-cext-num-rows.html

11.32 _mysql_connector.MySQL.num_rows() Method

Syntax: count = ccnx.num_rows(). Returns the number of rows in the active result set. Raises a MySQLError exception if there is no result set.

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