Once you manipulate the Access database and insert a single piece of data, it always fails, as follows:
by assignment, a field is cleared, and the final confirmation is that there is a problem at the Userage field.
later, suspect that the database support for numeric fields is not good, the Userage field instead of the string (%s), but the test found that the effect is the same as%d, Assignment "20", the database can be inserted successfully, the assignment of "199" failed to insert. found that 20:199 less than one byte can succeed, so suspect is sprintf formatted string more than 128 bytes, the array length 128 to 512, insert the Access database 199 success, and insert other values also succeeded.
Final conclusion: The array length is too short, that is, the sprintf formatted string exceeds 128 bytes, causing the execution of the SQL statement to fail.
Access database INSERT into failed