user2338089 user2338089 - 1 year ago 232
Python Question

Failed processing format-parameters with mysql.connector in Python

I can't figure out what I'm doing wrong with this insert statement. The error I'm getting is:

"Failed processing format-parameters; %s" % err)
mysql.connector.errors.ProgrammingError: Failed processing format-parameters; 'MySQLConverter' object has no attribute '_navigablestring_to_mysql'

The specific lines of code are:

update = '''INSERT INTO myDB.newtable (ID,Record,Latitude,Longitude,code) VALUES (%s,%s,%s,%s,%s)'''

I have also tried this format:

update = ("INSERT INTO myDB.newtable (ID,Record,Latitude,Longitude,code) VALUES (%s, %s, %s, %s, %s)")%(ID,Record,Latitude,Longitude,code)

and get this error:
mysql.connector.errors.ProgrammingError: 1054 (42S22): Unknown column '45676kb' in 'field list'

is only a portion of the entire value. The complete string is

I think the syntax of the second attempt is more correct, because I'm at least getting an sql error but I can't figure out how to properly format my insert statement with mysql.connector.

Answer Source

The first option is the correct way to put query parameters into the query - it is called a parameterized query. In this case, you are letting the database driver to escape the query parameters, safely insert them into the query and handle the Python-to-MySQL type conversions.

The error you are getting means that it could not convert one of the ID, Record, Latitude, Longitude or code parameter values to a valid MySQL database type. To be specific, see the variable types you have posted:

ID        <type 'unicode'> 
Record    <type 'unicode'>
Latitude  <class 'bs4.element.NavigableString'>
Longitude <class 'bs4.element.NavigableString'>
code      <type 'unicode'>

The problem is with Latitude and Longitude - they are BeautifulSoup's NavigableString class instances - the MySQL converter having difficulties in understanding how to convert a NavigableString object into a valid MySQL type. Convert them to strings explicitly beforehand:

update = """
cursor2.execute(update, (ID, Record, str(Latitude), str(Longitude), code))
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