数据操作 PHP - MySQL

Question

I'm new to PHP. I have a list of books with a reserve button next to each. Once a user clicks reserve it decreases the number of copies by one and removes the list item if there are no more copies.

That's how I did it (not sure if it is right?):

<?php
  $query = "SELECT * from book";
  $stmt;
  $stmt = $db->prepare($query);
  $stmt->bind_result($ISBN, $Title, $NoPages, $NoEdition, $NoCopies, $PubYear, $Publisher, $AuthorID);
  $stmt->execute();

  echo "<ul>";

  while ($stmt->fetch()){
    if ($NoCopies > 0){echo "<li> <b> $Title </b><i>published $PubYear with $NoPages pages </i>- Only $NoCopies copies left! <form action='reserve.php' method='POST'><input type='submit' name='sub' value='Reserve'></form> </li>";
    echo "<br>";
    echo "<li>$AuthorID</li>";
    echo "<br>";
    }
    if ($NoCopies == 1){
      echo "<li> <b> $Title </b><i>published $PubYear with $NoPages pages </i>- Only $NoCopies copies left! <form action='reserve.php' method='POST'></form> </li>";
      echo "<br>";
      echo "<li>$AuthorID</li>";
      echo "<br>";
    }
  }

  echo "</ul>";

  $stmt->close();

?>

What I have no idea about is: how do I make each button target a specific book?? So that when reserve is clicked only number of Copies for the book next to it is changed.

I would appreciate any help! Thank you!

Answer 1

I'm new to PHP. I have a list of books with a reserve button next to each. Once a user clicks reserve it decreases the number of copies by one and removes the list item if there are no more copies.

That's how I did it (not sure if it is right?):

<?php
  $query = "SELECT * from book";
  $stmt;
  $stmt = $db->prepare($query);
  $stmt->bind_result($ISBN, $Title, $NoPages, $NoEdition, $NoCopies, $PubYear, $Publisher, $AuthorID);
  $stmt->execute();

  echo "<ul>";

  while ($stmt->fetch()){
    if ($NoCopies > 0){echo "<li> <b> $Title </b><i>published $PubYear with $NoPages pages </i>- Only $NoCopies copies left! <form action='reserve.php' method='POST'><input type='submit' name='sub' value='Reserve'></form> </li>";
    echo "<br>";
    echo "<li>$AuthorID</li>";
    echo "<br>";
    }
    if ($NoCopies == 1){
      echo "<li> <b> $Title </b><i>published $PubYear with $NoPages pages </i>- Only $NoCopies copies left! <form action='reserve.php' method='POST'></form> </li>";
      echo "<br>";
      echo "<li>$AuthorID</li>";
      echo "<br>";
    }
  }

  echo "</ul>";

  $stmt->close();

?>

What I have no idea about is: how do I make each button target a specific book?? So that when reserve is clicked only number of Copies for the book next to it is changed.

I would appreciate any help! Thank you!