我是 python 的新手。编写了一个小代码来连接到数据库并从数据库中获取数据。我正在使用 python 3.4 和 mysql.connector 来连接数据库
HTML 表单用于获取用户名和密码，代码如下
<html>
<head>
<title>test</title>
<link rel="stylesheet" type="text/css" href="wel.css">
</head>
<body>
<form action="/cgi-bin/python1.py" method="post">
<label>First Name: <input type="text" name="first_name"></label><br />
<label>Password:<input type=password name="pass" /></label><br />
<input type="submit" value="Submit" />
</form>
</body>
</html>
python代码是从html中获取值，然后赋值给name和password。 sql语句用于通过WHERE子句从数据库中获取密码
python代码
#!"C:\python34\python.exe"
import cgitb ,cgi
import sys
import mysql.connector
cgitb.enable()
form = cgi.FieldStorage()
print("Content-Type: text/html;charset=utf-8")
print()
# Get data from fields
first_name = form.getvalue('first_name')
password = form.getvalue('pass')
print (password)
conn = mysql.connector.connect(host='localhost',port='8051',
database='example',
user='root',
password='test')
cursor = conn.cursor()
if conn.is_connected():
print('Connected to MySQL database')
cursor.execute("""SELECT pass FROM tablename1 where name = %s""",(first_name))
for row in cursor.fetchall():
print (row)
但是 where 子句的赋值错误。我没有得到什么语法错误。请给出建议 错误为:
ProgrammingError: 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 '%s' at line 1
args = (1064, "1064 (42000): You have an error in your SQL synt...n for the right syntax to use near '%s' at line 1", '42000')
errno = 1064
msg = "You have an error in your SQL syntax; check the ...n for the right syntax to use near '%s' at line 1"
sqlstate = '42000'
with_traceback = <built-in method with_traceback of ProgrammingError object>
最佳答案
您错过了单引号，正如@Matthias 所说，第二个参数是一个元组。
cursor.execute("""SELECT pass FROM tablename1 where name='%s'""", (first_name, ))
关于python - python mysql where子句中的错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30702619/