Python 3 MySQL sql 格式化字符串中的语法错误

Question

我正在玩 tkinter 和 MySQL，当我尝试 select 数据库中的东西时出现错误。我感觉这个错误与我有限的 sql and/or tkinter 经验有关...

所以，我有一个 tkinter 按钮调用一个名为 "testUserCredentials":

的函数

# Creating the login button, giving it the text "Log In", and
btnLogIn = ttk.Button(self, text="Log In", command=lambda:
                      testUserCredentials(uNameTb.get(),
                      pwdTb.get()))

据我了解，.get() 方法获取用户在文本框中输入的文本。然后调用 testUserCredentials(uName, password)，在这种情况下，uName 应等于 "AbbieH"，password 应为 "pui8Aifi"。该函数执行以下操作：

def testUserCredentials(uName, password):

query = ("SELECT username, password FROM users WHERE username = %s, password = %s")
args = (uName, password)

sqlResult = sendSqlQuery(query, args)

然后运行我必须处理与 MySQL 数据库通信的功能：

# Function for sending SQL queries to the MySQL database, accepts the query to
# be sent as a string
def sendSqlQuery(query, args):
    try:
        # Creating the connection string and parsing the details of which server
        # User to use, their password, the host for the connector to look at,
        # and lastly which database for them
        cnx = mysql.connector.connect(user='hireOut',
                                      password='>5/>£7(OW-1Bo>9e',
                                      host='localhost',
                                      database='hireout')

        # Creating a cursor to be able to iterate through any results that are
        # parsed back from the query
        cursor = cnx.cursor()
        # Telling the cursor to execute the query string
        cursor.execute(query, args)

        sqlResult = cursor.fetchall()

        for (username, password) in cursor:
            print("Username: %s" % username)
            print("Password: %s" % password)

        return sqlResult

        # using .is_connected() to check if the connection was made successfully
        if cnx.is_connected():
            print("Connection Established")

因此，当我按下登录按钮时出现的错误是：

1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ', password = 'pui8Aifi'' at line 1

我对 MySQL 语法的理解是 WHERE 语句的字符串必须用单引号引起来，这就是我认为我的字符串应该格式化为：

SELECT username, password FROM users WHERE username = 'AbbieH', password = 'pui8Aifi';

我心目中的这个字符串应该没问题，不会报错...但确实... 那我错过了什么？

提前感谢您的帮助

Answer 1

我认为您必须将第二个逗号替换为布尔运算符关键字：其中用户名 = 'AbbieH' 和密码 = 'pui8Aifi';

Python 3 MySQL sql 格式化字符串中的语法错误

Python 3 MySQL sql syntax error in formatted string

tkinter

mysql-8.0

python-3.7