Php pdo prepared statements select insert update queries

Hi guys in last tutorial we was discuss on PDO query statements such as SELECT Query, INSERT Query, UPDATE Query and DELETE Query like that in this tutorial we will discuss on how to execute all PDO queries with prepared statements.
Note : For PDO connection file click here.

What is prepared Statements

A prepared statement is a similar SQL statements, it’s feature used to execute the SQL statements.

1. Prepared SQL statement template is created and sent to the database. left side values is unspecified and we can specify according to our requirement, called parameters.
2. The database parses, compiles, and performs query optimization on the SQL statement template, and stores the result without executing it.
3. The application binds the values to the parameters, and the database executes the statement.

SELECT QUERY USING PREPARED STATEMENT

Here write the code of fetch data from users table using prepared statement PHP PDO.

$statement = $DBH->prepare("SELECT * FROM `users` WHERE id = ?");
$statement->execute(array($uid"));
$row = $statement->fetch();

INSERT QUERY USING PREPARED STATEMENT

Here write the code of insert data into users table using prepared statement PHP PDO.

$query = $DBH->prepare("INSERT INTO `users` (name, username, email) values (?, ?, ?)");
$query->execute(array($name, $username, $email));

UPDATE QUERY USING PREPARED STATEMENT

Here write the code of update data into users table using prepared statement PHP PDO.

$query = $DBH->prepare("UPDATE `users` SET `name` = ?, `email` = ? WHERE `id` = ?");
$query->execute(array($name, $email, $uid));