Php 从“删除数据库列”；选择"；使用mySQL的语句

我有下面的代码，它显示了我的books表中的所有书籍

<select id="booksToDelete">
    <?php
        foreach($bookTitles as $bookTitle) {
        echo '<option>';
        echo $bookTitle['Title'];
        echo '</option>';
        }
    ?>
    </select>

<input type="submit" name="deleteBook" id="deleteBook" value="Delete Book" />
    <?php

---

请帮忙

正如chris85在评论部分所指出的，您应该使用

ID

s来确定要在表中删除的内容。使用

标题

会导致多次删除，如果存在具有相同确切标题的书籍

让我们修复您的

选项

标记。我们将使用

value

属性将

ID

作为值，而不是

标题

。让我们也为您的

select

字段使用

name

属性

这在

表单中

标签中，对吗

<form method="POST" action=""> <!-- PUT THE PAGE WHERE YOU WILL PROCESS THE REQUEST TO THE ACTION ATTRIBUTE -->
    <select name="booksToDelete" id="booksToDelete">
<?php
    foreach($bookTitles as $bookTitle) {
        echo '<option value="'.$bookTitle['id'].'">'; /** REPLACE CORRESPONDING INDEX WITH THE UNIQUE ID COLUMN OF THE book TABLE **/
        echo $bookTitle['Title'];
        echo '</option>';
    }
?>
    </select>
    <input type="submit" name="deleteBook" id="deleteBook" value="Delete Book" />
</form>

---

标题在引号中，但“标题”不是唯一的，您应该使用ID。在输入title/ID时，还应该参数化查询。如果问题是如何在选项中输入值，则需要添加属性

值

。

<form method="POST" action=""> <!-- PUT THE PAGE WHERE YOU WILL PROCESS THE REQUEST TO THE ACTION ATTRIBUTE -->
    <select name="booksToDelete" id="booksToDelete">
<?php
    foreach($bookTitles as $bookTitle) {
        echo '<option value="'.$bookTitle['id'].'">'; /** REPLACE CORRESPONDING INDEX WITH THE UNIQUE ID COLUMN OF THE book TABLE **/
        echo $bookTitle['Title'];
        echo '</option>';
    }
?>
    </select>
    <input type="submit" name="deleteBook" id="deleteBook" value="Delete Book" />
</form>

/** ESTABLISH YOUR CONNECTION **/
$con = new mysqli("host", "user", "password", "database"); /** REPLACE NECESSARY DATA **/

/* CHECK CONNECTION */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

if(isset($_POST['deleteBook'])){

    $deleteQuery = "DELETE FROM book WHERE id = ?"; /** REPLACE NECESSARY UNIQUE ID COLUMN **/
    /*                                      ^       */

    $stmt = $con->prepare($deleteQuery);
    $stmt->bind_param("i", $_POST["booksToDelete"]);
    $stmt->execute();
    $stmt->close();

}