需要将产品添加到MySql数据库（远程） 由ionicApp提供。有一个产品页面。按下提交后，将从ionicApp＆＃34; Product.ts＆＃34;按功能createEntry（）分页。 如果在名为manage_products.php的PHP文件的帮助下没有约束错误，则已成功创建记录。 在离子应用中if（data.status === 200）为真，然后执行主体。但是如果创建了记录，就没有办法。如果有一些问题，例如一些空约束（Db侧），那么它只是通过chrome网络选项卡，我才知道一些约束错误。有没有办法从离子应用程序中的PHP文件接收错误文本。< / p>
以下是来自ionicApp＆＃34; Product.ts＆＃34;
的createEntry函数createEntry()
{
let id = "0000";
let name = "Some Product";
let description = "Some Product description";
let manufacturer_name = "manufacturer_name";
let weight = "some weight is here";
let weight_unit = "kg";
let halal_status = "HALAL";
let body : string = "key=create&id=" + id + "&name=" + name + "&description=" + description + "&manufacturer_name=" + manufacturer_name + "&weight=" + weight + "&weight_unit=" + weight_unit + "&halal_status=" + halal_status ,
type : string = "application/x-www-form-urlencoded; charset=UTF-8",
headers : any = new Headers({ 'Content-Type': type}),
options : any = new RequestOptions({ headers: headers }),
url : any = this.baseURI + "manage_products.php";
this.http.post(url, body, options)
.subscribe((data) =>
{
// If the request was successful notify the user
if(data.status === 200)
{
// this.hideForm = true;
console.log(`Congratulations the technology: ${name} was successfully added`);
console.log('successfully added the record. .......');
}
// Otherwise let 'em know anyway
else
{
// this.sendNotification('Something went wrong!');
console.log('Couldnt add the record.....xxx');
}
});
}
上面的代码正在调用php文件。这是php文件的代码。
<?php
header('Access-Control-Allow-Origin: *');
// Define database connection parameters
$hn = 'localhost';
$un = 'username';
$pwd = 'password';
$db = 'name-of-database';
$cs = 'utf8';
// Set up the PDO parameters
$dsn = "mysql:host=" . $hn . ";port=3306;dbname=" . $db . ";charset=" . $cs;
$opt = array(
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_OBJ,
PDO::ATTR_EMULATE_PREPARES => false,
);
// Create a PDO instance (connect to the database)
$pdo = new PDO($dsn, $un, $pwd, $opt);
// Retrieve specific parameter from supplied URL
$key = strip_tags($_REQUEST['key']);
$data = array();
// Determine which mode is being requested
switch($key)
{
// Add a new record to the technologies table
case "create":
// Sanitise URL supplied values
$id = filter_var($_REQUEST['id'], FILTER_SANITIZE_STRING, FILTER_FLAG_ENCODE_LOW);
$name = filter_var($_REQUEST['name'], FILTER_SANITIZE_STRING, FILTER_FLAG_ENCODE_LOW);
$manufacturer_name = filter_var($_REQUEST['manufacturer_name'], FILTER_SANITIZE_STRING, FILTER_FLAG_ENCODE_LOW);
$weight = filter_var($_REQUEST['weight'], FILTER_SANITIZE_STRING, FILTER_FLAG_ENCODE_LOW);
$weight_unit = filter_var($_REQUEST['weight_unit'], FILTER_SANITIZE_STRING, FILTER_FLAG_ENCODE_LOW);
$halal_status = filter_var($_REQUEST['halal_status'], FILTER_SANITIZE_STRING, FILTER_FLAG_ENCODE_LOW);
$description = filter_var($_REQUEST['description'], FILTER_SANITIZE_STRING, FILTER_FLAG_ENCODE_LOW);
// Attempt to run PDO prepared statement
try {
$sql = "INSERT INTO Products(id,name,manufacturer_name,weight,weight_unit,halal_status,description) VALUES(:id, :name, :manufacturer_name, :weight, :weight_unit, :halal_status, :description)";
$stmt = $pdo->prepare($sql);
$stmt->bindParam(':id', $id, PDO::PARAM_STR);
$stmt->bindParam(':name', $name, PDO::PARAM_STR);
$stmt->bindParam(':manufacturer_name', $manufacturer_name, PDO::PARAM_STR);
$stmt->bindParam(':weight', $weight, PDO::PARAM_STR);
$stmt->bindParam(':weight_unit', $weight_unit, PDO::PARAM_STR);
$stmt->bindParam(':halal_status', $halal_status, PDO::PARAM_STR);
$stmt->bindParam(':description', $description, PDO::PARAM_STR);
$stmt->execute();
echo json_encode(array('message' => 'Congratulations the record ' . $name . ' was added to the database'));
}
// Catch any errors in running the prepared statement
catch(PDOException $e)
{
echo $e->getMessage();
}
break;
// Update an existing record in the technologies table
case "update":
// Sanitise URL supplied values
/*
$name = filter_var($_REQUEST['name'], FILTER_SANITIZE_STRING, FILTER_FLAG_ENCODE_LOW);
$description = filter_var($_REQUEST['description'], FILTER_SANITIZE_STRING, FILTER_FLAG_ENCODE_LOW);
$recordID = filter_var($_REQUEST['recordID'], FILTER_SANITIZE_NUMBER_INT);
*/
$id = filter_var($_REQUEST['id'], FILTER_SANITIZE_STRING, FILTER_FLAG_ENCODE_LOW);
$name = filter_var($_REQUEST['name'], FILTER_SANITIZE_STRING, FILTER_FLAG_ENCODE_LOW);
$manufacturer_name = filter_var($_REQUEST['manufacturer_name'], FILTER_SANITIZE_STRING, FILTER_FLAG_ENCODE_LOW);
$weight = filter_var($_REQUEST['weight'], FILTER_SANITIZE_STRING, FILTER_FLAG_ENCODE_LOW);
$weight_unit = filter_var($_REQUEST['weight_unit'], FILTER_SANITIZE_STRING, FILTER_FLAG_ENCODE_LOW);
$halal_status = filter_var($_REQUEST['halal_status'], FILTER_SANITIZE_STRING, FILTER_FLAG_ENCODE_LOW);
// Attempt to run PDO prepared statement
try {
$sql = "UPDATE Products SET id = :id, name = :name,manufacturer_name = :manufacturer_name,weight = :weight,weight_unit = :weight_unit,halal_status = : halal_status, description = :description WHERE id = :id";
$stmt = $pdo->prepare($sql);
/*
$stmt->bindParam(':name', $name, PDO::PARAM_STR);
$stmt->bindParam(':description', $description, PDO::PARAM_STR);
$stmt->bindParam(':id', $recordID, PDO::PARAM_INT);
*/
$stmt->bindParam(':id', $name, PDO::PARAM_STR);
$stmt->bindParam(':name', $name, PDO::PARAM_STR);
$stmt->bindParam(':manufacturer_name', $description, PDO::PARAM_STR);
$stmt->bindParam(':weight', $name, PDO::PARAM_STR);
$stmt->bindParam(':weight_unit', $name, PDO::PARAM_STR);
$stmt->bindParam(':halal_status', $description, PDO::PARAM_STR);
$stmt->bindParam(':description', $name, PDO::PARAM_STR);
$stmt->execute();
echo json_encode('Congratulations the record ' . $name . ' was updated');
}
// Catch any errors in running the prepared statement
catch(PDOException $e)
{
echo $e->getMessage();
}
break;
// Remove an existing record in the technologies table
case "delete":
// Sanitise supplied record ID for matching to table record
$recordID = filter_var($_REQUEST['id'], FILTER_SANITIZE_NUMBER_INT);
// Attempt to run PDO prepared statement
try {
$pdo = new PDO($dsn, $un, $pwd);
$sql = "DELETE FROM Products WHERE id = :id";
$stmt = $pdo->prepare($sql);
$stmt->bindParam(':id', $recordID, PDO::PARAM_INT);
$stmt->execute();
echo json_encode('Congratulations the record ' . $name . ' was removed');
}
// Catch any errors in running the prepared statement
catch(PDOException $e)
{
echo $e->getMessage();
}
break;
}
?>
答案 0 :(得分：0)
您可以使用alertcontroller或toastcontroller并在订阅数据后通过添加catch来显示错误消息...像这样
catch((err)=>{
this.AlertMessage("error", err);
});