尝试将文本字段中的数据插入数据库时​​出现MySQL错误

Question

尝试将数据从我的网站插入数据库时​​出现此错误：

Error: INSERT INTO newtask (new_category, new_department, new_required, 
new_name, new_address, new_contact, new_email,  new_logged, new_description) 
VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
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 '?, ?, ?, ?, ?, ?, ?, 
?, 
?)' at line 1

这是我的代码：

<?php
$servername = 'localhost';
$username = 'root';
$password = '';
$dbname = 'tasks_db';


$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
} 

$sql = "INSERT INTO newtask (new_category, new_department, new_required, 
new_name, new_address, new_contact, new_email,  new_logged, new_description) 
VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)";

if ($conn->query($sql) === TRUE) {
echo "New record created successfully";
} else {
echo "Error: " . $sql . "<br>" . $conn->error;
}

$conn->close();
?> 

不确定在这里我在做什么错吗？

Answer 1

这是一条准备好的语句，因此您需要准备它，绑定值并然后执行它：

$stmt = $conn->prepare("INSERT INTO newtask (new_category, new_department, new_required, 
new_name, new_address, new_contact, new_email,  new_logged, new_description) 
VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)");

// One "s" per placeholder value, plus one value per "s" after
$stmt->bind_param("sssssssss", $new_category, $new_department, ...);

if ($stmt->execute()) {
  echo "New record created successfully";
} else {
  echo "Error: " . $sql . "<br>" . $conn->error;
}

$new_category的值就是该列中要输入的值，依此类推。 the documentation涵盖了所有内容。

错误是您试图运行带有占位符值且无数据的SQL查询。 ?在MySQL中不是有效值。在驱动程序级别，用bind_param生成的语句的prepare操作已将其替换。 query函数按原样执行代码。