我想首先,获取一个ID来查询数据库并将结果打印在一个表中(这部分工作).我想接受用户提供的id并使用它来使用

PHP更新数据库中的信息.我想使用第二个窗体上的输入作为更新数据库的值.

要更改的表是客户,它包含字段ID,NAME,ADDRESS.我不希望用户能够更改ID.

Form1中：

Please type the ID of the person you wish to add to change their data

ID

窗体2：

New Information for Customer with ID entered above

这是我当前的php请求,但它不起作用,$_POST检查值是否设置返回false.

session_start();

if (isset($_POST["id"])){

$servername = 'localhost';

$user = 'root';

$pass = '';

$db = 'the_sports_store';

$conn = new mysqli($servername,$user, $pass, $db);

// Check connection

if ($conn->connect_error) {

echo '

echo 'alert("DB Connection Failed:")';

echo '';

die("" . $conn->connect_error);

}

$sessionID = $_SESSION["ID"];

$newName = $_SESSION["newName"];

$newAddress = $_SESSION["newAddress"];

var_dump($newName);

$sql = "SELECT * FROM `customers` WHERE ID='$sessionID';";

//display the current record, allow user input to alter it, then display new data

if ($conn->query($sql) == TRUE) {

echo"

";

if(!empty($_POST["newName"]) && !empty($_POST["newAddress"])){

echo '

echo 'alert(',$sessionID,');';

echo '';

$newName = $_POST["newName"];

$newAddress = $_POST["newAddress"];

$sqlChange = "UPDATE `customers`

SET `NAME` = '$newName', `ADDRESS` = '$newAddress'

WHERE `ID` = '$sessionID';";

if ($conn->query($sqlChange) === TRUE) {

echo '

echo 'alert("Update Successful.")';

echo '';

} else {

echo '

echo 'alert("Error. Update Unsucessful.")';

echo '';

}

}else if(!empty($_POST["newName"])){

$newName = $_POST["newName"];

$sqlChange = "UPDATE `customers` SET `NAME` = '$newName' WHERE `ID` = '$sessionID'";

echo '

echo 'alert(',$newName,');';

echo '';

if ($conn->query($sqlChange) === TRUE) {

echo '

echo 'alert("Update Successful.")';

echo '';

} else {

echo '

echo 'alert("Error. Update Unsucessful.")';

echo '';

}

}else if(!empty($_POST["newAddress"])){

$newName = $_POST["newAddress"];

$sqlChange = "UPDATE `customers` SET `ADDRESS` = '$newAddress' WHERE `ID` = '$sessionID'";

echo '

echo 'alert(',$sessionID,');';

echo '';

if ($conn->query($sqlChange) === TRUE) {

echo '

echo 'alert("Update Successful.")';

echo '';

} else {

echo '

echo 'alert("Error. Update Unsucessful.")';

echo '';

}

} else{

echo '

echo 'alert(',$sessionID,');';

echo '';

}

}

$conn->close();

}

?>