php - 将表单数据推送到数据库 PHP、MYSQL 时出现“查询为空”错误

Question

我正在使用的代码（如下）由于某种原因不起作用，我检查了 html 表单中的所有匹配项 - 我只是无法弄清楚这一点。

我会因为 HTML 方面的问题而收到错误吗？我正在使用 jQuery 表单验证器（这很好用）这会导致问题吗？ http://jqueryvalidation.org/

<?php

$host="localhost"; // Host name 
$username="USERNAME"; // Mysql username 
$password="PASSWORD"; // Mysql password 
$db_name="DBNAME"; // Database name 
$tbl_name="Persons"; // Table name 

// Connect to server and select database.
mysql_connect("$host", "$username", "$password")or die("cannot connect"); 
mysql_select_db("$db_name")or die("cannot select DB");

// Get values from form 
$fname=$_POST['fname'];
$lname=$_POST['lname'];
$company=$_POST['company'];
$email=$_POST['email'];
$registered=$_POST['registered'];
$percentage=$_POST['percentage'];
$products=$_POST['products'];
$prize=$_POST['prize'];
$terms=$_POST['terms'];
$newsletter=$_POST['newsletter'];


// Insert data into mysql 
$sql="INSERT INTO $tbl_name(FirstName, LastNname, Company, EmailAddress, Registered, PercentOfBusiness, ProductsSold, WhichPrize, Newsletter)VALUES('$fname', '$lname', '$company', '$email', '$registered', '$percentage', '$products', '$prize', '$terms', '$newsletter')";
$result=mysql_query($sql);

// if successfully insert data into database, displays message "Successful". 
if($result){
echo "Successful";
echo "<BR>";
echo "<a href='insert.php'>Back to main page</a>";
}

else {
echo "ERROR";
}
?> 

<?php
$result = mysql_query($query) or die(mysql_error());
?>

<?php 
// close connection 
mysql_close();
?>

Answer 1

你得到错误

 <?php
  $result = mysql_query($query) or die(mysql_error());
 ?>

稍后在您的脚本中执行并且$query未设置。你真正的插入在上面。

$sql="INSERT INTO $tbl_name(FirstName, LastNname, Company, EmailAddress, Registered, PercentOfBusiness, ProductsSold, WhichPrize, Newsletter)VALUES('$fname', '$lname', '$company', '$email', '$registered', '$percentage', '$products', '$prize', '$terms', '$newsletter')";
$result=mysql_query($sql);

您还应该将其更改为$result=mysql_query($sql) or die(mysql_error());

看看实际插入是否有错误。删除辅助查询执行。

Answer 2

$sql="INSERT INTO $tbl_name VALUES(FirstName, LastNname, Company, EmailAddress, Registered, PercentOfBusiness, ProductsSold, WhichPrize, Newsletter)VALUES('$fname', '$lname', '$company', '$email', '$registered', '$percentage', '$products', '$prize', '$terms', '$newsletter')";
$result=mysql_query($sql);