Why Does My Python MySQL Query Show 'Not all parameters were used in the SQL statement'?

Addressing "Not all parameters were used in the SQL statement" Error in Python (MySQL)

When attempting to execute an SQL statement using mysql.connector, you may encounter the error "Not all parameters were used in the SQL statement." This error indicates a mismatch between the number of parameters specified in the SQL query and the number of values provided in the data tuple.

To resolve this issue, carefully review the SQL query and confirm that all parameters are being correctly used. In the provided code, the issue arises because the placeholder characters for integers (%d) are incorrect.

add_user = ("INSERT INTO DB.tbluser "
       "(username, department, startyear, currentpos, link) "
       "VALUES (%s, %s, %d, %d, %s)")  # Incorrect use of %d for integers

To rectify this error, use the correct placeholder character for integers (%s) instead:

add_user = ("INSERT INTO DB.tbluser "
       "(username, department, startyear, currentpos, link) "
       "VALUES (%s, %s, %s, %s, %s)")  # Correct use of %s for all parameters

Remember that placeholder characters vary depending on the database adapter you are using. For mysql.connector, %s is used for both strings and integers. By using the appropriate placeholder characters, you can ensure that the number of parameters matches the values provided, thereby eliminating the "Not all parameters were used" error.

The above is the detailed content of Why Does My Python MySQL Query Show 'Not all parameters were used in the SQL statement'?. For more information, please follow other related articles on the PHP Chinese website!