Question

我有一个简单的数据库，我想通过该数据库更新许多记录。每页有一个记录，用户可以单击以移至第一，下一个，上一个和最后一个记录。分页和更新一样有效。什么不起作用（这使我烦恼）是这样的事实：单击按钮时，它不会返回同一记录，也不会显示最近输入的值。导航然后再次返回表明更新已成功。我确定问题的部分原因在于：

<form name="form1" method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>" >

我非常感谢您的帮助。这可能很简单，但却使我望而却步。我在下面粘贴完整的代码。谢谢。

<?php
$id = "";
$fname = "";
$lname = "";
$email = "";
$selected="";
if ( isset( $_POST[ 'id' ] ) ) {
    $id = $_POST[ 'id' ];
}
if ( isset( $_POST[ 'fname' ] ) ) {
    $fname = $_POST[ 'fname' ];
}
if ( isset( $_POST[ 'lname' ] ) ) {
    $lname = $_POST[ 'lname' ];
}
if ( isset( $_POST[ 'email' ] ) ) {
    $email = $_POST[ 'email' ];
}
if ( isset( $_POST[ 'submit' ] ) ) {
    $selected = implode(', ', (array)$_POST['warning']);
}
?>
<?php
$connect = mysqli_connect( "localhost", "", "", "ps10" );
$record_per_page = 1;
$page = '';

if ( isset( $_GET[ 'page' ] ) ) {
    $page = $_GET[ 'page' ];
} else {
    $page = 1;
}
$start_from = ( $page - 1 ) * $record_per_page;
$query = "SELECT * FROM studentdata LIMIT $start_from, $record_per_page";
$result = mysqli_query( $connect, $query );
?>
<!DOCTYPE html>
<html>
<head>
    <title>Pagination</title>
</head>

<body>
    <form name="form1" method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>" >

        <table width='50%' border='1'>
            <?php
            while ( $row = mysqli_fetch_array( $result ) ) {
                ?>
            <tr>
                <td>ID</td>
                <td><input name="id" id="id" value="<?php echo $row['id']; ?>" size="40">
                </td>
            </tr>
            <tr>
                <td>First Name</td>
                <td><input name="fname" type="text" id="fname" value="<?php echo $row['fname']; ?>" size="40">
                </td>
            </tr>
            <tr>
                <td>Last Name</td>
                <td><input name="lname" type="text" id="lname" value="<?php echo $row['lname']; ?>" size="40">
                </td>
            </tr>
            <tr>
                <td>Email</td>
                <td><input name="email" type="text" id="email" value="<?php echo $row['email']; ?>" size="40">
                </td>
            </tr>
            <tr>
                <td>Warnings</td>
                <td><input name="selected" type="text" id="selected" value="<?php echo $row['selected']; ?>" size="120">
                </td>
            </tr>
            <?php
            }
            ?>
        </table>
            <input type="checkbox" name="warning[]" value="more than 10% is quoted material">More than 10% is quoted material
            <br><br>
            <input type="checkbox" name="warning[]" value="question not answered">Question not answered
            <br><br>
            <input type="checkbox" name="warning[]" value="significant plagiarism">Significant plagiarism
            <br><br>
            <input type="checkbox" name="warning[]" value="more than 10% underlength">More than 10% underlength
            <br><br>
            <input type="checkbox" name="warning[]" value="possibly not own work">Possibly not own work
            <br><br>
            <br>
            <input name="submit" type="submit" class="button1" value="Update Record">
                    </td>
        </form>
        <?php
        $sql = "UPDATE studentdata SET fname='$fname', lname='$lname', email='$email', selected='$selected' WHERE id='$id'";
        $result = mysqli_query( $connect, $sql );
        ?>
        <p>
            <?php
            echo "<table width = '50%' border = '0'>";
            ?>
            <?php
            $page_query = "SELECT * FROM studentdata ORDER BY id ASC";
            $page_result = mysqli_query( $connect, $page_query );
            $total_records = mysqli_num_rows( $page_result );
            $total_pages = ceil( $total_records / $record_per_page );
            $start_loop = $page;
            $difference = $total_pages - $page;
            if ( $difference <= 2 ) {
                $start_loop = $total_pages - 2;
            }
            $end_loop = $start_loop + 1;
            if ( $page > 1 ) {
                echo "<tr><td align ='center' width ='25%' ><a href='student_record_pagination_update.php?page=1'>First</a></td>";
                echo "<td align ='center' width ='25%'><a href='student_record_pagination_update.php?page=" . ( $page - 1 ) . "'>Previous</a></td>";
            }
            for ( $i = $start_loop; $i <= $end_loop; $i++ ) {
                echo "<a href='student_record_pagination_update.php?page=" . $i . "'></a>";
            }
            if ( $page <= $end_loop ) {
                echo "<td align ='center' width ='25%' ><a href='student_record_pagination_update.php?page=" . ( $page + 1 ) . "'>Next</a></td>";
                echo "<td align ='center' width ='25%' ><a href='student_record_pagination_update.php?page=" . $total_pages . "'>Last</a></td>";
            }
            ?>
            <?php
            echo "</table>";
            ?>
</body>
</html>

将记录更新到同一页面

0 个答案: