Not all parameters were used in the SQL statement (Python, MySQL)

Ok here is my solution:

the %d's need to be %s's

the ''' works for multiple lines so does a +" at the start of a line and a "\ at the end but that is not this issue here

I find sometimes the cursor.execute(query, values) or in your case the cursor.execute(add_user, data_user) buggy sometimes.. so I attach the values directly to the query.

You do this by first moving your data_user above the add_user. Then you add %values at the end of the query string (in your case %data_user). This will allow you to preform a nice little print(add_user) before the cursor.exec(add_user) command to look for other bugs.

        import mysql.connector

        cnx = mysql.connector.connect(
              user='root', 
              password='',
              host='127.0.0.1',
              database='DB')

        cursor = cnx.cursor()

        Name = "James"
        Department = "Finance"
        StartYear = 2001
        CurrentPos = 2001
        Link = ""

        data_user = (Name, Department, StartYear, CurrentPos, Link)

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


        cursor.execute(add_user)
        cnx.commit()
        cursor.close()
        cnx.close()

The parameter marker is %s not %d.

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

Note that the parameter markers used by mysql.connector may look the same as the %s used in Python string formatting but the relationship is only coincidental. Some database adapters like oursql and sqlite3 use ? as the parameter marker instead of %s.