MySQL FAQs

MySQL FAQs

MySQL is an open-source relational database management system. As the name suggests, it is used to create, update, and store databases. It is based on SQL (Structured Query Language). So, today we will be checking out the 13 most asked questions on MySQL.

MySQL is an open-source relational database management system. As the

name suggests, it is used to create, update, and store databases. It is based on SQL (Structured Query Language). So, today we will be checking out the 13 most asked questions on MySQL.

13 Most Asked Questions On MySQL

1. How to prevent SQL injection in PHP?

Answer:

Use prepared statements and parameterized queries.

These are SQL statements that are sent to and parsed by the database server separately from any parameters. This way it is impossible for an

attacker to inject malicious SQL. You basically have two options to

achieve this:

i. Using PDO (for any supported database driver):

$stmt = $pdo->prepare('SELECT * FROM employees WHERE name = :name');

$stmt->execute([ 'name' => $name ]);

foreach ($stmt as $row) {
    // Do something with $row
}

ii. Using MySQLi (for MySQL):

$stmt = $dbConnection->prepare('SELECT * FROM employees WHERE name = ?');
$stmt->bind_param('s', $name); // 's' specifies the variable type => 'string'

$stmt->execute();

$result = $stmt->get_result();
while ($row = $result->fetch_assoc()) {
    // Do something with $row
}

If you’re connecting to a database other than MySQL, there is a driver-specific second option that you can refer to (for example, 

pg_prepare()andpg_execute()for PostgreSQL). PDO is the universal option.

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