从 html 到 mysql 数据库的基本输入

Question

我试图使用基本的 php 将数据从 html 表单插入到 mysql 表中。我最初使用基本的纯文本输入是成功的。但是，当我尝试输入电子邮件 ID 时，我不断收到此错误：

Could not enter data: 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 '@gmail.com,moohawks )' at line 3

我的php代码如下：

$firstname = $_REQUEST['firstname'];
    $lastname = $_REQUEST['lastname'];
    $emailid = $_REQUEST['emailid'];
    $team_name = $_REQUEST['team_name'];
$dbhost = 'localhost';
$dbuser = 'root';
$dbpass = 'incredible';
$conn = mysql_connect($dbhost, $dbuser, $dbpass);
if(! $conn )
{
  die('Could not connect: ' . mysql_error());
}
$sql = "INSERT INTO users 
       (firstname,lastname,emailid,teamname)
       VALUES ( $firstname,$lastname,$emailid,$team_name )";

mysql_select_db('adb project');
$retval = mysql_query( $sql, $conn );
if(! $retval )
{
  die('Could not enter data: ' . mysql_error());
}
$message2 =  "Entered data successfully\n";
mysql_close($conn);
?>

我的插入语句有什么问题。据我所知，它看起来正确且相当简单。有什么帮助吗？

Answer 1

更正您的 SQL 语句如下，并为每个变量加上单引号

$sql = "INSERT INTO users 
       (firstname,lastname,emailid,teamname)
       VALUES ( '$firstname','$lastname','$emailid','$team_name' )";