ID在编辑按钮代码上无效

Question

我有一个代码，显示存储在数据库中的数据。我想创建一个允许我编辑数据的编辑按钮或链接（我有一个表格，用于显示列和行中的数据）。

我的编辑代码片段

// once saved, redirect back to the view page
 header("Location: insertchart.php"); 
 }
 }
 else
 {
 // if the 'id' isn't valid, display an error
 echo 'Error!123';
 }
 }
 else
 // if the form hasn't been submitted, get the data from the db and display the form
 {

 // get the 'id' value from the URL (if it exists), making sure that it is valid (checing that it is numeric/larger than 0)
 if (isset($_GET['newId']) && is_numeric($_GET['newId']) && $_GET['newId'] > 0)
 {
 // query db
 $newId = $_GET['newId'];
 $result = mysql_query("SELECT * FROM charts WHERE newId=$newId")
 or die(mysql_error()); 
 $row = mysql_fetch_array($result);

 // check that the 'id' matches up with a row in the databse
 if($row)
 {

 // get data from db
 $charts_date = $row['charts_date'];
 $charts_retrace = $row['charts_retrace'];
$charts_start_of_swing_trade = $row['charts_start_of_swing_trade'];
$charts_end_of_swing_trade = $row['charts_end_of_swing_trade'];
$charts_bullflag = $row['charts_bullflag'];
$charts_bearflag = $row['charts_bearflag'];
$charts_ema_crossover = $row['charts_ema_crossover'];
$charts_trading_instrument = $row['charts_trading_instrument'];

 // show form
 renderForm($newId, $charts_date, $charts_retrace, $charts_start_of_swing_trade, $charts_end_of_swing_trade, $charts_bullflag, $charts_bearflag, $charts_ema_crossover, $charts_trading_instrument, '');
 }
 else
 // if no match, display result
 {
 echo "No results!";
 }
 }
 else
 // if the 'id' in the URL isn't valid, or if there is no 'id' value, display an error
 {
 echo 'Error!345';
 }
 }
?>

当我点击我的编辑按钮时，我得到错误！345我知道它正在查询数据库，但我不知道为什么它告诉我我的ID有错误。

根据要求，这是我的表格代码，显示编辑链接：

$result = $conn->query($sql);
if($result && $result->num_rows > 0) {
    // output data of each row
echo "<h2>What is currently inside the database?</h2><br><br>
   <table style='border: solid #000000 1px;border-collapse:collapse;'>
     <tr>
       <td style='border: solid #000000 1px;padding:15px;'><strong><u>Chart</u></strong></td>
       <td style='border: solid #000000 1px;padding:15px;'><strong><u>Date</u></strong></td>
       <td style='border: solid #000000 1px;padding:15px;'><strong><u>Retrace</u></strong></td>
       <td style='border: solid #000000 1px;padding:15px;'><strong><u>Start of Swing Trade</u></strong></td>
       <td style='border: solid #000000 1px;padding:15px;'><strong><u>End of Swing Trade</u></strong></td>
       <td style='border: solid #000000 1px;padding:15px;'><strong><u>Bull flag</u></strong></td>
       <td style='border: solid #000000 1px;padding:15px;'><strong><u>Bear flag</u></strong></td>
       <td style='border: solid #000000 1px;padding:15px;'><strong><u>EMA Crossover</u></strong></td>
       <td style='border: solid #000000 1px;padding:15px;'><strong><u>Trading Instrument</u></strong></td>
     </tr>";
    while ($row=mysqli_fetch_array($result)) {
        echo  "<tr><td style='border: solid #000000 1px;'><a href=" . $row["charts_URL"]. "><img src=". $row["charts_URL"]. " width='200px'></a></td>";
        echo  "<td style='border: solid #000000 1px;'>" . $row["charts_date"]. "<br>"; echo "<a href='edit.php?id=" . $row['newId'] . "'>Edit</a></td>";
        echo  "<td style='border: solid #000000 1px;'>" . $row["charts_retrace"]. "</td>";
        echo  "<td style='border: solid #000000 1px;'>" . $row["charts_start_of_swing_trade"]. "</td>";
        echo  "<td style='border: solid #000000 1px;'>" . $row["charts_end_of_swing_trade"]. "</td>";
        echo  "<td style='border: solid #000000 1px;'>" . $row["charts_bullflag"]. "</td>";
        echo  "<td style='border: solid #000000 1px;'>" . $row["charts_bearflag"]. "</td>";
        echo  "<td style='border: solid #000000 1px;'>" . $row["charts_ema_crossover"]. "</td>";
        echo  "<td style='border: solid #000000 1px;'>" . $row["charts_trading_instrument"]. "</td></tr>";
    }
     echo "</table>";
} else {
    echo "0 results";
}

编辑代码位于charts_date单元格下面。