无法插入 PHP 到 MYSQL 数据库

Question

我可以从数据库中读取，但是当我向数据库中插入数据时，它说"Successfully Registered!"，然后我检查我的数据库，它没有插入任何数据。

Register.php

    <!DOCTYPE HTML>
    <html>
<head>
<title>Register page</title>
<br>
<font size="5" color="black"><b>&nbsp;Register Page<br><br></b></font>
</head>

<body background=" images/background.jpg">
<form action="index.php">
    <input type="submit" value="Home">
</form>
<br>
<form action="Register.php" method="POST">
 <fieldset>
  <legend>Enter your information</legend>
  <table>
      <tr>
          <td>Username:</td>
          <td><input type="text" name="username" required="required"/><br></td>
      </tr>
      <tr>
          <td>Password:</td>
          <td><input type="text" name="password" required="required"/><br></td>
      </tr>
      <tr>
          <td>Email:</td>
          <td><input type="text" name="email" required="required"/><br></td>
      </tr>
      <tr>
          <td>First Name:</td>
          <td><input type="text" name="firstname" required="required"/><br></td>
      </tr>
      <tr>
          <td>Last Name:</td>
          <td><input type="text" name="lastname" required="required"/><br></td>
      </tr>
      <tr>
          <td>Date of Birth:</td>
          <td><input type="date" name="dateofbirth" required="required" ><br></td>
      </tr>
      <tr>
          <td><input type="submit" value="Register"/></td>
    </tr>

  </table>
 </fieldset>
</form>


</body>
</html>
<?php
if($_SERVER["REQUEST_METHOD"] == "POST")
    {
        $username   = mysql_real_escape_string($_POST['username']);
        $password   = mysql_real_escape_string($_POST['password']);
        $firstname  = $_POST['firstname'];
        $lastname   = $_POST['lastname'];
        $email      = mysql_real_escape_string($_POST['email']);
        $dateofbirth= $_POST['dateofbirth'];
        echo "user is :".$username;
        $bool = true;
        mysql_connect("localhost", "root", "") or die(mysql_error());
        mysql_select_db("userdata") or die(mysql_error("Cannot Connect to Database"));
        $query = mysql_query("SELECT * FROM users");
        while($row = mysql_fetch_array($query))
                {
                    $table_users = $row['username'];
                    if($username == $table_users)
                        {
                            $bool = false;
                            Print '<script>alert("username is used!");</script>';
                            Print '<script>window.location.assign("Register.php");</script>';

                        }
                }
        if($bool)
         {
        mysql_query("INSERT INTO users ('username','password','email','firstname','lastname','dateofbirth') VALUES ('$username','$password','$email','$firstname','$lastname','$dateofbirth')");
        Print '<script>alert("Successfully Registered!");</script>';
        Print '<script>window.location.assign("Register.php");</script>';
         }


}
 ?>

已解决： 我使用 PDO 而不是 mysql_ 和 mysqli_ 。

Answer 1

更新你的底码

if($bool)
    {
        mysql_query("INSERT INTO users ('username','password','email','firstname','lastname','dateofbirth') VALUES ('$username','$password','$email','$firstname','$lastname','$dateofbirth')");
        Print '<script>alert("Successfully Registered!");</script>';
        Print '<script>window.location.assign("Register.php");</script>';
    }

Answer 2

您在 mysql 查询中的用户名前缺少开头 '。不确定这是否是问题所在，但它会导致问题。

Answer 3

更正 SQL:

mysql_query("INSERT INTO users (username','password','email','firstname','lastname','dateofbirth') VALUES ('$username','$password','$email','$firstname','$lastname','$dateofbirth')");

到

mysql_query("INSERT INTO users (username,password,email,firstname,lastname,dateofbirth) VALUES ('$username','$password','$email','$firstname','$lastname','$dateofbirth')");

解释：

在MySQL中，字段名称没有用单引号引起来。相当它们可以用反引号 (`) 括起来以避免与保留关键字。

注意：不要使用mysql_*函数。它们已被弃用，您 mysqli_* 或 PDO 代替。

Answer 4

这与 INSERT 问题本身无关，而是与检查用户名是否存在于数据库中的例程有关：

...
$bool = true;
$query = mysql_query("SELECT * FROM users");
while($row = mysql_fetch_array($query))
{
    $table_users = $row['username'];
    if($username == $table_users)
    {
        $bool = false;
        Print '<script>alert("username is used!");</script>';
   }
}
if($bool)
{
...

无需在代码中遍历用户 table 的所有记录，您可以使用 SQL 为您完成这项工作：

...
$username_esc = mysql_real_escape_string($username);
$query = mysql_query("SELECT * FROM users where username = '$username_esc'");
...

然后只检查查询 returns 是否有任何行。

希望对您有所帮助。

Answer 5

我测试了您的代码，发现连接不正确，其次您在字段名称中使用的引号语法不正确，因此查询未执行。我的意见是使用 mysqli_connect 而不是 mysql_connect 它已经过时且已弃用。我已经更新了您的代码，希望对您有所帮助：

    <?php 
//your values from post I just assign test for all
$username   = 'test';//mysql_real_escape_string($_POST['username']);
$password   = 'test';//mysql_real_escape_string($_POST['password']);
$firstname  = 'test';//mysql_real_escape_string($_POST['firstname']);
$lastname   = 'test';//mysql_real_escape_string($_POST['lastname']);
$email      = 'test';//mysql_real_escape_string($_POST['email']);
$dateofbirth= 'test';//mysql_real_escape_string($_POST['dateofbirth']);
$bool = true;

//database connection
$servername = "localhost";
$username1 = "root";
$password1 = "";
$db  = 'test_001';

// Create connection
$conn = new mysqli($servername, $username1, $password1, $db);

$result = $conn->query("SELECT * FROM users");

while($row = $result->fetch_assoc())
{
    $table_users = $row['username'];
    if($username == $table_users)
    {
        $bool = false;
        Print '<script>alert("username is used!");</script>';
        //Print '<script>window.location.assign("Register.php");</script>';

    }
}

if($bool)
{
    //mysql_query("INSERT INTO users ('username','password','email','firstname','lastname','dateofbirth') VALUES ('$username','$password','$email','$firstname','$lastname','$dateofbirth')");

    $query = "INSERT INTO users (username,password,email,firstname,lastname,dateofbirth) VALUES ('$username','$password','$email','$firstname','$lastname','$dateofbirth')";
    $x = $conn->query($query);
    if ($x)
        Print '<script>alert("Successfully Registered!");</script>';
    Print '<script>window.location.assign("Register.php");</script>';
}

Answer 6

您需要删除字段名称周围的引号，因此您的任务应该是

插入用户（用户名、密码、电子邮件、名字、姓氏、出生日期） VALUES ('$username','$password','$email','$firstname','$lastname','$dateofbirth')

我还建议使用数据库包装器自动转义变量。

http://www.chris-shaw.com/b/How-to-connect-to-a-database-using-a-class

Answer 7

PDO解决这个问题 MYSQL 出了很多问题，但当我使用 PDO 时，它解决了问题

Answer 8

$sql = "INSERT INTO users (name,username,password,status,picture) VALUES ('$name','$uname','$pass',0,'$picture')";

无法插入 PHP 到 MYSQL 数据库

Cannot Insert Into PHP to MYSQL database

php

mysql

database

insert-into