Question

我制作了这段代码

<?php
  mysql_connect ("localhost","root","root");
  mysql_select_db ("new");
  $newusername=$_POST ['newusername'];
  $newpassword=$_POST ['newpassword'];
  $submit=$_POST ['submit'];
  if($submit) {
    $newaccount= "INSERT INTO users (name,password) VALUES ("$newusername","$newpassword")";
    $result=mysql_query($newaccount);
    if ($result) {
      print "account has been created"."<meta http-equiv="refresh" content="5;login.php">";
    }
    else {
      echo " The account is already exist";
    }
  }
?>

但它表示第8行的错误是＆＃34;插入＆＃34;线

Answer 1

双引号存在问题。您可以添加连接：

$newaccount = "INSERT INTO users (name,password) VALUES ('" . $newusername . "','" . $newpassword . "')";

P.S。不要使用mysql_ *函数（不推荐使用mysql扩展），而是使用mysqli_ *。

Answer 2

您使用了错误的引用：

$newaccount= "INSERT INTO users (name,password) VALUES ('$newusername','$newpassword')";

Answer 3

对引号进行排序并使用mysql_real_escape_string来清理输入（并防止轻松的SQL注入攻击）： -

<?php
mysql_connect("localhost","root","root");
mysql_select_db ("new");
$newusername = mysql_real_escape_string($_POST['newusername']);
$newpassword = mysql_real_escape_string($_POST['newpassword']);
$submit = $_POST['submit'];
if($submit) 
{
    $newaccount = "INSERT INTO users (name, password) VALUES ('$newusername', '$newpassword')";
    $result = mysql_query($newaccount);
    if ($result) 
    {
        print "account has been created"."<meta http-equiv='refresh' content='5;login.php'>";
    }
    else 
    {
        echo " The account is already exist";
    }
}
?>

Answer 4

$newaccount= "INSERT INTO users (name,password) VALUES ("$newusername","$newpassword")";

以

$newaccount= "INSERT INTO users (name,password) VALUES ('".$newusername."','".$newpassword."')";

OR TO

$newaccount= "INSERT INTO users (name,password) VALUES ('$newusername','$newpassword')";

Answer 5

<?php
    mysql_connect ("localhost","root","root");
    mysql_select_db ("new");
    $newusername=$_POST ['newusername'];
    $newpassword=$_POST ['newpassword'];
    $submit=$_POST ['submit'];
    if($submit) {
    $newaccount= "INSERT INTO users (name,password) VALUES ('".$newusername."', '".$newpassword."')";
    $result=mysql_query($newaccount);
    if ($result) {
    print "account has been created"."<meta http-equiv="refresh" content="5;login.php">";
    }
    else {
    echo " The account is already exist";
    }
    }
    ?>

为什么插入不工作

5 个答案: