MYSQLdb / Python-并非在字符串格式化错误期间转换了所有参数？

Question

Trying to select some info from a database, I have a database manager class that looks like this:

class DatabaseManager:
    def __init__(self):
        self.connection = MySQLdb.connect(host="localhost", 
                     user="neal", 
                      passwd="hacker123",
                      db="massive") 

        self.cursor = self.connection.cursor()

When trying to do a SELECT like this:

    db = DatabaseManager()
    db.cursor.execute("SELECT password FROM USERS WHERE apikey = %s", str(request.apikey))

I get a

TypeError: not all arguments converted during string formatting

This is odd as I have similar queries elsewhere that worked fine, like this one:

db.cursor.execute('''INSERT into USERS(email, username, password, apikey) values (%s, %s, %s, %s)''',
    (request.email, request.username, request.password, apikey))

Am I doing this wrong?

EDIT: Column confusion, table looks like this:

CREATE TABLE users (
id int NOT NULL AUTO_INCREMENT, 
email varchar(255) NOT NULL,
username varchar(25) NOT NULL,
password varchar(25) NOT NULL,
apikey varchar(45) NOT NULL,
PRIMARY KEY (id),
UNIQUE(email),
UNIQUE(username),
UNIQUE(apikey)
);

Answer 1

That is because the second argument of execute is an iterable . So you would be better off with a list, set, or tuple.

Try this:

db.cursor.execute("SELECT password FROM USERS WHERE apikey = %s", (str(request.apikey),))

Answer 2

您应该给元组，而不需要解析str;

db.cursor.execute("SELECT password FROM USERS WHERE apikey = %s", (request.apikey,))

Answer 3

you are much better off with something like this:

db.cursor.execute("SELECT password FROM USERS WHERE apikey = {0}".format(str(request.apikey)))

given that request.apikey can be implicitly converted into a string