How can the issue of potential ID mix-ups be avoided when inserting data into multiple tables with a 1:n relationship in PHP?

When inserting data into multiple tables with a 1:n relationship in PHP, the issue of potential ID mix-ups can be avoided by using transactions. By wrapping the insert queries in a transaction block, we ensure that either all inserts succeed or none do, preventing any inconsistencies in the IDs across tables. 

// Establish a database connection
$pdo = new PDO("mysql:host=localhost;dbname=mydatabase", "username", "password");

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

try {
    // Insert data into the parent table
    $parentQuery = $pdo->prepare("INSERT INTO parent_table (name) VALUES (:name)");
    $parentQuery->execute(array(':name' => 'Parent Name'));
    $parentId = $pdo->lastInsertId();

    // Insert data into the child table with the correct parent ID
    $childQuery = $pdo->prepare("INSERT INTO child_table (parent_id, child_name) VALUES (:parent_id, :child_name)");
    $childQuery->execute(array(':parent_id' => $parentId, ':child_name' => 'Child Name'));

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

Keywords

PHP data insertion multiple tables 1:n relationship ID mix-ups

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