On Sep 21, 2009, at 5:18 AM, Threader Slash wrote:
Hi Everybody...
I have a query that works as follows:
Code:
db.query("""SELECT traveler.travelerFirstName,vaccine.vaccineName from
(traveler INNER JOIN takenvaccine ON traveler.travelerID =
takenvaccine.travelerID)
INNER JOIN vaccine ON takenvaccine.vaccineID=vaccine.vaccineID
INNER JOIN requiredvaccine ON
vaccine.vaccineID=requiredvaccine.requiredvaccineID
INNER JOIN city ON requiredvaccine.cityID = city.cityID
WHERE traveler.travelerFirstName = 'John'""")
The output gives me all vaccines taken by a given employee. To allow
the
user to choose different names when running the system, I am trying
to use a
variable, named *person*:
Code:
person = "John"
db.query("""SELECT traveler.travelerFirstName,vaccine.vaccineName from
(traveler INNER JOIN takenvaccine ON traveler.travelerID =
takenvaccine.travelerID)
INNER JOIN vaccine ON takenvaccine.vaccineID=vaccine.vaccineID
INNER JOIN requiredvaccine ON
vaccine.vaccineID=requiredvaccine.requiredvaccineID
INNER JOIN city ON requiredvaccine.cityID = city.cityID
WHERE traveler.travelerFirstName = 'person'""")
Then I run the query inside my python program. The first version
without
variable works fine. But the second, using variable, doesn't give me
any
output. What I am missing here about the python variable sintaxe to
make the
MySQL work with variable ... Any suggestion?
In your second query you've got "person" hardcoded as a string. You're
looking for a traveler with the actual first name of person.
Change this line:
WHERE traveler.travelerFirstName = 'person'""")
to this:
WHERE traveler.travelerFirstName = %s""")
and pass person as a list of params to db.query(). Something like this
should work:
sql = """SELECT blah blah blah WHERE traveler.travelerFirstName = %s"""
db.query(sql, [person])
See the Python DB API documentation for specifics. This might look
like the same thing as string interpolation, but it isn't.
Good luck
Philip
--
http://mail.python.org/mailman/listinfo/python-list
