What potential issues can arise when updating data across multiple tables in PHP?

One potential issue that can arise when updating data across multiple tables in PHP is maintaining data integrity. To solve this, you can use transactions to ensure that either all updates are successfully completed or none of them are. 

// Start a transaction
$pdo->beginTransaction();

try {
    // Update data in table 1
    $stmt1 = $pdo->prepare("UPDATE table1 SET column1 = :value WHERE id = :id");
    $stmt1->execute(['value' => $value1, 'id' => $id]);

    // Update data in table 2
    $stmt2 = $pdo->prepare("UPDATE table2 SET column2 = :value WHERE id = :id");
    $stmt2->execute(['value' => $value2, 'id' => $id]);

    // Commit the transaction
    $pdo->commit();
} catch (Exception $e) {
    // Rollback the transaction if an error occurs
    $pdo->rollback();
    echo "Error updating data: " . $e->getMessage();
}

Keywords

SQL injection transaction management foreign key constraints data integrity database normalization

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