Why Does My MySQL Python Query Return 'Not all Parameters Were Used'?

Resolving "Not all Parameters Used" Error in MySQL (Python)

When executing an SQL query using Python and MySQL, the error "Not all parameters were used in the SQL statement" can arise due to a mismatch in parameter markers.

The Python code in question attempts to insert data into a MySQL table using the execute() method with named parameters. However, the parameter markers used in the SQL query are incorrect.

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

In this query, the parameter markers for startyear and currentpos are %d (integer), while the data to be inserted for these parameters is of type integer (2001). However, the correct parameter marker for integers in MySQL is %s.

The revised code using the correct parameter markers is:

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

This modification ensures that all parameters specified in the SQL query are used and match the data types of the values to be inserted, resolving the "Not all parameters were used" error.

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