Why Doesn\'t My PDO Prepared Statement INSERT INTO MySQL?

MySQL INSERT INTO Queries with PDO Prepared Statements

In the realm of PHP development, using PDO to execute MySQL queries offers numerous advantages. However, beginners often encounter obstacles while attempting to utilize prepared statements for INSERT INTO operations.

Let's consider this enigmatic code snippet:

$statement = $link->prepare("INSERT INTO testtable(name, lastname, age)
VALUES('Bob','Desaunois','18')");
$statement->execute();

Despite the diligent efforts of the coder, the database remains distressingly empty. What elusive error lurks within the code?

The Hidden Key to Success

The key to unraveling this enigma lies in understanding the power of parameter binding. PDO prepared statements allow developers to securely bind values to placeholders in their SQL queries without resorting to concatenation. To accomplish this, the following steps should be meticulously followed:

1. Utilize parameter placeholders (:foo or ?) in the SQL statement.
2. Construct an associative array or indexed array containing the values to bind.
3. Use the execute() function to pass the array as an argument, binding the values to the placeholders.

Sample Code with Bind Parameters

$statement = $link->prepare('INSERT INTO testtable (name, lastname, age)
    VALUES (:fname, :sname, :age)');

$statement->execute([
    'fname' => 'Bob',
    'sname' => 'Desaunois',
    'age' => '18',
]);

Sample Code with Index Parameters

$statement = $link->prepare('INSERT INTO testtable (name, lastname, age)
    VALUES (?, ?, ?)');

$statement->execute(['Bob', 'Desaunois', '18']);

Advantages and Preferences

Both parameter binding methods offer their own advantages and disadvantages. Binding by parameter names provides increased readability, while binding by index allows for a reduction in code. The choice ultimately depends on the developer's preference.

Embracing these principles will empower developers to effortlessly execute INSERT INTO operations using PDO prepared statements, ensuring that their data finds its rightful place in the database.

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