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

Understanding the "Not all parameters were used in the SQL statement" Error

When working with MySQL databases using Python, you may encounter an error stating "Not all parameters were used in the SQL statement." This error occurs when the number of parameters specified in an SQL query does not match the number of values provided in the data tuple.

In the provided code snippet, the SQL statement prepares an INSERT query to add a user to a table named 'tbluser' in the 'DB' database. However, the issue arises in the following line:

add_user = ("INSERT INTO DB.tbluser "
       "(username, department, startyear, currentpos, link) "
       "VALUES (%s, %s, %d, %d, %s)")

The integer parameters (i.e., %d) are used for the 'startyear' and 'currentpos' values, while the string parameter (%s) is used for the other values. This mismatch between parameter types and data values leads to the error.

To resolve the issue, modify the SQL statement to use %s as the parameter marker for all values:

add_user = ("INSERT INTO DB.tbluser "
       "(username, department, startyear, currentpos, link) "
       "VALUES (%s, %s, %s, %s, %s)")

This ensures that the number of parameters matches the number of values provided in the data tuple.

Remember that different database adapters may use different parameter markers, so always refer to the specific documentation for the adapter you are using.

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