使用单选按钮和连接表获取 MySQL 数据

Fetch MySQL data using radio buttons and joining tables

我的tables:

Table1个姓名:拍摄者 字段:id(主键,AI),title,director,year,catid

Table2 姓名:猫 字段:catid(主键,AI),category

将电影添加到数据库可以通过提交表单正常工作,但我希望能够添加一个类别以及单选按钮这里是问题所在,我不知道我需要做什么,我尝试加入 tables 与 catid 之间的关系,但它不会工作,我只得到

没有可显示的结果!

添加电影后,我可以在数据库中看到电影,但在浏览器中看不到,它们在第一个 table 中都获得 catid 0,在第二个 table 中我有catid 值为 1-6 的 6 个类别。

我是这方面的新手,所以非常感谢任何帮助!

这是我的 HTML 表单和单选按钮

  <form action="movies.php" method="post">
    <input type="radio" name="id" value="1" checked />Action<br>
    <br> <input type="radio" name="id" value="2" />Comedy<br>
    <br> <input type="radio" name="id" value="3" />Drama<br>
    <br> <input type="radio" name="id" value="4" />Horror<br>
    <br> <input type="radio" name="id" value="5" />Romantic<br>
    <br> <input type="radio" name="id" value="6" />Animated<br><br>

    <pre>
    Title<input type="text" name="titel">
    Director<input type="text" name="director">
    Year <input type="text" name="year">
    <input type="submit" name="submit" value="Submit" />
    </pre>
  </form>

这是我的 PHP 文件,用于将电影添加到数据库中。

//Post data
if (isset($_POST['submit'])){

    $title = htmlentities($_POST['titel'], ENT_QUOTES);
    $director = htmlentities($_POST['director'], ENT_QUOTES);
    $year = htmlentities($_POST['year'], ENT_QUOTES);


    // empty form = error
    if ($title == '' || $director == '' || $year == ''){

        $error = 'ERROR: Please fill in all required fields!';
        echo $error;

      } else {

    //inserts movie to database
    if ($stmt = $mysqlic->prepare("INSERT INTO filmer 
       (titel, director, year) VALUES (?, ?, ?)")){

            $stmt->bind_param("ssi", $title, $director, $year);
            $stmt->execute();
            $stmt->close();


        // show an error if the query has an error
        } else {

          echo "ERROR: Could not prepare SQL statement.";
        }

        // redirec the user
        header("Location: view.php");
    }

}

这里是 PHP 显示数据库中电影的文件

// get movies from the database
 if ($result = $mysqlic->query("SELECT cat.catid FROM cat 
     INNER JOIN filmer ON cat.catid=filmer.catid")){

        // display records if there are records to display
        if ($result->num_rows > 0){


        // display records in a table
        echo "<table border='1' cellpadding='10'>";

        // set table headers
       echo "<tr><th>Title</th>
             <th>Director</th>
             <th>Year</th>
             <th>Category</th>";

        while ($row = $result->fetch_object()){


        // set up a row for each record
                echo "<tr>";
                echo "<td>" . $row->titel . "</td>";
                echo "<td>" . $row->director . "</td>";
                echo "<td>" . $row->year . "</td>";
                echo "<td>" . $row->Category . "</td>";
                echo "</tr>";
               }

                echo "</table>";

        // if there are no records in the database, display an alert message
                } else {

            echo "No results to display!";
            }

        // show an error if there is an issue with the database query
                } else {

            echo "Error: " . $mysqlic->error;
            }

// close database connection
    $mysqlic->close();

将新电影添加到 table 时,您没有指定它的 类别 。 谁会猜出您需要什么类别? 所以你需要使用这个查询来澄清这一点:

INSERT INTO filmer (titel, director, year, catid) VALUES (?, ?, ?, ?)

我添加了字段名称 catid,如您的问题中所述以及额外的 ? 接下来,您必须获取类别 ID。这可以通过以下方式完成:

$cat_id = intval($_POST['id']);

绑定参数后:

 $stmt->bind_param("ssii", $title, $director, $year, $cat_id);

如果我没理解错的话,您想要 post 猫 ID 以及其他字段。我已经添加了猫 ID 的名称,因此它被捕获在 $_POST 中。然后放入插入查询。

//Post data
if (isset($_POST['submit'])){

$title = htmlentities($_POST['titel'], ENT_QUOTES);
$director = htmlentities($_POST['director'], ENT_QUOTES);
$year = htmlentities($_POST['year'], ENT_QUOTES);
$catid= htmlentities($_POST['id'], ENT_QUOTES); //gets the catid


// empty form = error
if ($title == '' || $director == '' || $year == ''){

    $error = 'ERROR: Please fill in all required fields!';
    echo $error;

  } else {

//inserts movie to database
if ($stmt = $mysqlic->prepare("INSERT INTO filmer 
   (titel, director, year. catid) VALUES (?, ?, ?, ?)")){

        $stmt->bind_param("ssi", $title, $director, $year, $catid);
        $stmt->execute();
        $stmt->close();


    // show an error if the query has an error
    } else {

      echo "ERROR: Could not prepare SQL statement.";
    }

    // redirec the user
    header("Location: view.php");
}

}