输出是像 [{a:b, d:c,....},{a:f, b:q,...},{a:v, b:k,....}, 的元组。 ..]

Question

Using mySQL I am running this: (Getting data and looping it through a table)

users is the table. The console is outputting a tuple.

db = MySQLdb.connect("username.mysql.pythonanywhere-services.com", "username", "password", "username$database")
cursor = db.cursor()    
cursor.execute('SELECT uid, firstname, lastname, username, city, state, streetaddress, email, special_needs, phonenumber, zipcode FROM users')
results = cursor.fetchall()
print(results)

I am getting this back:

[{'special_needs': 'N/A', 'phonenumber': '5555555555', 'city': 'Oakland', 'zipcode': '44444', 'streetaddress': '32323 Apple St.', 'state': 'CA', 'email': 'bernie@taylor.com', 'uid': 1, 'firstname': 'Bernie', 'lastname': 'Sanders', 'username': 'bernieswift'}, {'special_needs': 'N/A', 'phonenumber': '6666666666', 'city': 'Greenappple', 'zipcode': '77777', 'streetaddress': '24936 Calaroga Ave.', 'state': 'CA', 'email': 'green@grass.com', 'uid': 2, 'firstname': 'john', 'lastname': 'lost', 'username': 'tony'}]

What I was doing before: ( this works locally )

print_str = "<table>"
for result in results:
print_str += "<tr><td> %s <br></td><td> %s <br></td><td> %s <br></td><td> %s <br></td><td> %s <br></td><td> %s <br></td><td> %s <br></td><td> %s <br></td><td> %s <br></td><td> %s <br></td><td> %s <br></td><td> %s <br></td><tr>" % (result['uid'], result['firstname'], result['lastname'], result['username'], result['city'], result['state'], result['streetaddress'], result['email'], result['special_needs'], result['phonenumber'], result['zipcode'])
    print_str += "</table>"

How do I get specific values for uid, firstname, etc? (assuming I want to iterate through the whole database) How do I get the individual values from the database? I'm really confused by tuple.

Answer 1

I think you can do something like this. for example, you want firstname where uid is equal to 1

uname = [counter['firsname'] for counter in result if counter['uid'] == 1] which returns ['Bernie']

This works with more complicated statements for example:

data = [(counter['firstname'],counter['lastname']) for counter in result if counter['city'] in ['Oakland', 'Greenappple']]

returns [('Bernie', 'Sanders'), ('john', 'lost')]

Although this is not the perfect solution it gets the job done.

Answer 2

You need to initialise your database removing DictCursor.

You will have something like the following:

`MySQLdb.connect(user='joe', passwd='password', db='dbname',
                      cursorclass=MySQLdb.cursors.DictCursor)`