我使用python编写代码并使用SQLite。我需要使用UPDATE和WHERE语句更新表。挑战在于WHERE和UPDATE语句的值都必须是变量。我做了一些研究，发现此链接Sqlite3 Updating Row Defined by a Variable和此https://www.tutorialspoint.com/sqlite/sqlite_update_query.htm
def studentlist():
'''Checks if a student is checked in any class, inserts the status into the
student list table Displays a list of all students and their class status'''
c.execute("SELECT StudentID FROM StudentTable")
all_students = c.fetchall()
c.execute("SELECT StudentID FROM CheckedInTable")
selected_student_id = c.fetchall()
print("The student id in the studentlist is:", selected_student_id,)
for i in all_students:
if i in selected_student_id:
student_attendance = 'Attending a class'
c.execute("UPDATE StudentlistTable set ClassAttend = ?", (student_attendance), "WHERE StudentID = ?", (i))
conn.commit()
else:
student_attendance = "Not in class"
c.execute("UPDATE StudentlistTable set ClassAttend = ?", (student_attendance))
conn.commit()
studentlist()
运行代码后，我收到以下错误
c.execute("UPDATE StudentlistTable set ClassAttend = ?", (student_attendance), "WHERE StudentID = ?", (i))
TypeError: function takes at most 2 arguments (4 given)
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答案 0 :(得分：3)
根据您收到的错误消息，<?php
###############################################################
# cPanel WHM Account Creator 1.1
###############################################################
# Visit http://www.zubrag.com/scripts/ for updates
###############################################################
# Required parameters:
# - domain - new account domain
# - user - new account username
# - password - new account password
# - package - new account hosting package (plan)
# - email - contact email
#
# Sample run: create-whm-account.php?domain=reseller.com&user=hosting&password=manager&package=unix_500
#
# If no parameters passed then input form will be shown to enter data.
#
# This script can also be run from another PHP script. This may
# be helpful if you have some user interface already in place and
# want to automatically create WHM accounts from there.
# In this case you have to setup following variables instead of
# passing them as parameters:
# - $user_domain - new account domain
# - $user_name - new account username
# - $user_pass - new account password
# - $user_plan - new account hosting package (plan)
# - $user_email - contact email
#
###############################################################
/////// YOUR WHM LOGIN DATA
$whm_user = "root"; // reseller username
$whm_pass = "PASS"; // the password you use to login to WHM
#####################################################################################
############## END OF SETTINGS. DO NOT EDIT BELOW #######################
#####################################################################################
$whm_host = $_SERVER['HTTP_HOST'];
function getVar($name, $def = '') {
if (isset($_REQUEST[$name]))
return $_REQUEST[$name];
else
return $def;
}
// Domain name of new hosting account
// To create subdomain just pass full subdomain name
// Example: newuser.zubrag.com
if (!isset($user_domain)) {
$user_domain = getVar('domain');
}
// Username of the new hosting account
if (!isset($user_name)) {
$user_name = getVar('user');
}
// Password for the new hosting account
if (!isset($user_pass)) {
$user_pass = getVar('password');
}
// New hosting account Package
if (!isset($user_plan)) {
$user_plan = getVar('package');
}
// Contact email
if (!isset($user_email)) {
$user_email = getVar('email');
}
// if parameters passed then create account
if (!empty($user_name)) {
// create account on the cPanel server
$script = "http://{$whm_user}:{$whm_pass}@{$whm_host}:2086/scripts/wwwacct";
$params = "?plan={$user_plan}&domain={$user_domain}&username={$user_name}&password={$user_pass}&contactemail={$user_email}";
$result = file_get_contents($script.$params);
// output result
echo "RESULT: " . $result;
}
// otherwise show input form
else {
$frm = <<<EOD
<html>
<head>
<title>cPanel/WHM Account Creator</title>
<META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE">
<META HTTP-EQUIV="PRAGMA" CONTENT="NO-CACHE">
</head>
<body>
<style>
input { border: 1px solid black; }
</style>
<form method="post">
<h3>cPanel/WHM Account Creator</h3>
<table border="0">
<tr><td>Domain:</td><td><input name="domain" size="30"></td><td>Subdomain or domain, without www</td></tr>
<tr><td>Username:</td><td><input name="user" size="30"></td><td>Username to be created</td></tr>
<tr><td>Password:</td><td><input name="password" size="30"></td><td></td></tr>
<tr><td>Package:</td><td><input name="package" size="30"></td><td>Package (hosting plan) name. Make sure you cpecify existing package</td></tr>
<tr><td>Contact Email:</td><td><input name="email" size="30"></td><td></td></tr>
<tr><td colspan="3"><br /><input type="submit" value="Create Account"></td></tr>
</table>
</form>
</body>
</html>
EOD;
echo $frm;
}
?>
函数需要2个参数，第一个参数用于查询，第二个参数包含要在查询中使用的参数。试试这个：
execute()这是一个很好的参考问题，可以更详细地讨论您的问题：