php - 从数据库提取到文本区域

Question

我正在将当前数据与更新后的数据进行比较，以检查信息是否有变化，并将变化添加到新表变化中:

if (isset($_POST['submit'])) 
{
    $sql = "SHOW COLUMNS FROM Employees";
    $result = mysqli_query($con,$sql);
     while($row = mysqli_fetch_array($result)){
                $tempname = $row['Field'];
                $sql2 = "UPDATE Employees SET ".$row['Field']."= '$_POST[$tempname]' WHERE AFNumber='".$_GET["af"]."'";
                $result2 = mysqli_query($con,$sql2);
                if ($con->query($sql2) === TRUE) {
                } else {
                    echo "Error: " . $sql2 . "<br>" . $con->error;
                    echo '<script>swal("Error", "Something went wrong '.$con->error.'", "error");</script>';
                }

    $sqlOldData = "SELECT * FROM Employees WHERE AFNumber='".$_GET["af"]."' AND (".$row['Field']." NOT LIKE '".$_POST[$tempname]."')";
    $result3 = $con->query($sqlOldData);
    if ($result3->num_rows > 0) {

    while($row3 = $result3->fetch_assoc()) {
        $sql3 = "INSERT INTO Changes (Table, AFNumber, Attribute,DateChanged,HRUser,OldValue,NewValue)
VALUES ('Employees', '".$_GET["af"]."', '".$row["Field"]."', '".date('dd/m/Y HH:mm:ss')."', '$login_session', '.$row3[0]', '$_POST[$tempname]')";
        if ($con->query($sql3) === TRUE) {
        echo "New record created successfully";
        } else {
            echo "Error: " . $sql3 . "<br>" . $con->error;
        }
    }
    } else {
        echo "0 results";
    }

}

现在我想提取有关更改的信息，例如日期用户......并以这种形式将它们放在 textarea 标签中:

<textarea name="changes" rows="50" cols="59" disabled>
  12/07/2015 - User:"Mike"  Changed:"Actual Location" From: "blabla" to "bla"
</textarea>

但我不知道该怎么做，请帮忙......

Answer 1

在不太了解您的数据(例如 AFNumber 是什么)的情况下，我建议简单地查询 Changes 表中的所有内容，并以所需的形式显示它们:

$changes = $con->query("SELECT * FROM Changes WHERE Table = 'Employees'");
if ($changes->num_rows > 0) {
    echo '<textarea name="changes" rows="50" cols="59" disabled>' . "\n";
    while ($row = $changes->fetch_assoc()) {
        echo sprintf('%s - User:%s  Chnaged:"%s" From: "%s" to "%s"',
            $row['DateChanged'], $row['HRUser'], $row['Attribute'],
            $row['OldValue'], $row['NewValue']) . "\n";
    }
    echo "</textarea>";
}

为了显示数据，我在这里简单地使用了 echo，但是使用一些模板系统应该不会对解决方案的核心概念产生太大影响。