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Einfügen in die Datenbank (mysql) mit Ajax und PHP

Wie auch immer, dieser spezielle Code funktioniert, um das Einfügen in die Datenbank zu ermöglichen, obwohl es irgendwo noch ein Problem gibt, das ich nicht herausfinden kann.

index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <title>Bootstrap Example with Ajax</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
    <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
    <script>
      $(function () {
        $('button').click(function () {
          var name2 = $('#name').val();
          var email2 = $('#email').val();
          var password2 = $('#password').val();
          var gender2 = $('#gender').val();
          console.log('starting ajax');
          $.ajax({
            url: "./insert.php",
            type: "post",
            data: { name: name2, email: email2, password: password2, gender: gender2 },
            success: function (data) {
              var dataParsed = JSON.parse(data);
              console.log(dataParsed);
            }
          });

        });
      });

    </script>

    <style>
      .custom{
         margin-left:200px;
      }
    </style>
  </head>
  <body>

    <div class="container">
      <h2 class="text-center">Insert Data Using Ajax</h2>

      <form class="form-horizontal" >
        <div class="form-group">
          <label class="col-sm-2 control-label">Name</label>
          <div class="col-sm-10">
            <input class="form-control" name="name" id="name" type="text" placeholder="Enter you name">
          </div>
        </div>
        <div class="form-group">
          <label for="email" class="col-sm-2 control-label">Email</label>
          <div class="col-sm-10">
            <input class="form-control" name="email" id="email" type="text" placeholder="Your Email...">
          </div>
        </div>
          <div class="form-group">
            <label for="password" class="col-sm-2 control-label">Password</label>
            <div class="col-sm-10">
              <input class="form-control" name="password" id="password" type="text" placeholder="Your Password...">
            </div>
          </div>
          <div class="form-group">
            <label for="gender" class="col-sm-2 control-label">Gender</label>
            <div class="col-sm-10">
              <select id="gender" class="form-control">
                <option value="Male">Male</option>
                <option value="Female">Female</option>
              </select>
            </div>
          </div>
          <div class="form-group">
            <div class="col-sm-offset-2 col-sm-10">
              <button type="submit" class="btn btn-default">Submit</button>
            </div>
          </div>
      </form>
    </div>
  </body>
</html>

insert.php

<?php

    //Create connection
  $connection = mysqli_connect('localhost', 'root', '', 'dbase');
    if($_POST['name']){
      $name = $_POST['name'];
      $email = $_POST['email'];
      $password= $_POST['password'];
      $gender = $_POST['gender'];

      $q = "INSERT INTO user (name, email, password, gender) VALUES ('$name', '$email', '$password', '$gender')";

      $query = mysqli_query($connection, $q);

      if($query){
          echo json_encode("Data Inserted Successfully");
          }
      else {
          echo json_encode('problem');
          }
      }

?>