php mysql pdo connection
<?php
$servername = "localhost";
$username = "username";
$password = "password";
try {
$conn = new PDO("mysql:host=$servername;dbname=myDB", $username, $password);
// set the PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
echo "Connected successfully";
}
catch(PDOException $e)
{
echo "Connection failed: " . $e->getMessage();
}
?>php pdo transaction
$pdo = new PDO(
$dsn,
$username,
$password,
array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION)
);
try {
$statement = $pdo->prepare("UPDATE user SET name = :name");
$pdo->beginTransaction();
$statement->execute(["name"=>'Bob']);
$statement->execute(["name"=>'Joe']);
$pdo->commit();
}
catch (\Exception $e) {
if ($pdo->inTransaction()) {
$pdo->rollback();
// If we got here our two data updates are not in the database
}
throw $e;
}php pdo transaction
// In this example we are using MySQL but this applies to any database that has support for transactions
$db = new PDO('mysql:host=' . $host . ';dbname=' . $dbname . ';charset=utf8', $username, $password);
// Make sure that PDO will throw an exception in case of error to make error handling easier
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
try {
// From this point and until the transaction is being committed every change to the database can be reverted
$db->beginTransaction();
// Insert the metadata of the order into the database
$preparedStatement = $db->prepare(
'INSERT INTO `orders` (`order_id`, `name`, `address`, `created_at`)
VALUES (:name, :address, :telephone, :created_at)'
);
$preparedStatement->execute([
'name' => $name,
'address' => $address,
'telephone' => $telephone,
'created_at' => time(),
]);
// Get the generated `order_id`
$orderId = $db->lastInsertId();
// Construct the query for inserting the products of the order
$insertProductsQuery = 'INSERT INTO `orders_products` (`order_id`, `product_id`, `quantity`) VALUES';
$count = 0;
foreach ( $products as $productId => $quantity ) {
$insertProductsQuery .= ' (:order_id' . $count . ', :product_id' . $count . ', :quantity' . $count . ')';
$insertProductsParams['order_id' . $count] = $orderId;
$insertProductsParams['product_id' . $count] = $productId;
$insertProductsParams['quantity' . $count] = $quantity;
++$count;
}
// Insert the products included in the order into the database
$preparedStatement = $db->prepare($insertProductsQuery);
$preparedStatement->execute($insertProductsParams);
// Make the changes to the database permanent
$db->commit();
}
catch ( PDOException $e ) {
// Failed to insert the order into the database so we rollback any changes
$db->rollback();
throw $e;
}Copyright © 2021 Codeinu
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