PHP删除按钮...不起作用（模式）

有人可以告诉我我在做什么错吗？我创建了一个表格，每行都有一个删除按钮，单击后会弹出一个模态对话框，询问我是否要删除该行。但是，当我单击按钮时，什么也没有发生。为什么会发生这种情况？（我怀疑可能是由于INNER JOIN）有什么解决方案？

list_book.php（INNER JOIN）：

 <table class="table table-bordered table-hover" id="datatable">
    <thead>
        <tr> 
            <th>Número</th>
            <th>Estante</th>
            <th>Obra</th>
            <th>Autor</th>
            <th>Categoria</th>
            <th>Ano Escolaridade</th> 
            <th>Observação</th>
            <th class="text-center">Opções</th>
        </tr>
    </thead>
    <tbody> 
        <?php
        $query = "SELECT B.number, B.shelf, B.title, B.author, B.obs, C.category_name, S.scholarity_name FROM book AS B 
        INNER JOIN category AS C ON C.id_category=B.category_id INNER JOIN scholarity AS S ON S.id_scholarity=B.scholarity_id";
        $res = mysql_query($query);
        mysql_set_charset('utf-8');
        if (!$res) {
            echo "Erro ao executar a query";
        } else {
            while ($dados = mysql_fetch_array($res)) {
                ?>
                <tr>
                    <td><?php echo $dados['number']; ?></td>
                    <td><?php echo $dados['shelf']; ?></td>
                    <td><?php echo $dados['title']; ?></td>
                    <td><?php echo $dados['author']; ?></td>
                    <td><?php echo $dados['category_name']; ?></td>
                    <td><?php echo $dados['scholarity_name']; ?></td>
                    <td><?php echo $dados['obs']; ?></td>
                    <td class="text-center">
                        <a href="#" class="btn btn-warning btn-xs"><span class="fa fa-edit"></span>&nbsp;Editar</a>
                        <a class="btn btn-danger btn-xs" data-toggle="modal" data-target="#<?php echo $dados['id']; ?>" data-whatever="@mdo"><span class="fa fa-trash"></span>&nbsp;Apagar</a>
                        <?php include('modal_delete.php'); ?>
                    </td>
                </tr>
                <?php
            }
        }
        ?>
    </tbody>
</table>

模态（自举）

<div class="modal"  id="<?php echo $dados['id_book']; ?>" tabindex="-1" role="dialog" aria-labelledby="mySmallModalLabel" aria-hidden="true">
  <div class="modal-dialog">
     <div class="modal-content">
        <div class="modal-header">
            <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
            <h4 class="modal-title text-left">Apagar</h4>
        </div>
        <div class="modal-body text-left">
            <p>Deseja apagar este  registro?</p>
        </div>
        <div class="modal-footer">
            <a href="../delete/delete_book.php?id=<?php echo $dados['id_book']; ?>" type="button" class="btn btn-primary">Apagar</a>
            <button type="button" class="btn btn-default" data-dismiss="modal">Cancelar</button>
        </div>
    </div>
</div>

delete_book.php

<?php
session_start();
require("../../conexao/conexao.php");

$id = $_GET["id"];
$query= "DELETE FROM book WHERE id_book = $id";
$delete= mysql_query($query);
    if(!$delete){
        echo "Erro!! Não foi possivel apagar dado.";    
    }
    else{
        echo"Dado removido com sucesso!";
            header("Location: ../list/list_book.php");
    }?>

我对此并不陌生，所以如果出现问题...请帮助我。