PHP · Theory

MySQLi CONNECT

Theory

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MySQLi CONNECT

MySQLi CONNECT is a PHP topic. In plain words you use it for fetch marks by roll in the college DB. Don’t start with a slogan — start with that picture.

Smallest example: prepared statement. Type it, run it, and say what you see. If you can do that from memory, you know MySQLi CONNECT.

From the example next to this theory: MySQLi CONNECT — use prepared statements with PDO/MySQLi — never concatenate raw SQL.

Trap — string-concat SQL. Fix that before you talk about advanced PHP.

Viva — what is MySQLi CONNECT? Then show prepared statement. Then name the trap.

Exam tip

What is MySQLi CONNECT? Show this: prepared statement. Trap: string-concat SQL.

Example

<?php
// PDO sketch (connection details omitted)
// $pdo = new PDO($dsn, $user, $pass);
// $stmt = $pdo->prepare("SELECT id, name FROM users WHERE id = ?");
// $stmt->execute([1]);
// $row = $stmt->fetch();
$demo = ["id" => 1, "name" => "Asha"];
echo $demo["name"];

MySQLi CONNECT — use prepared statements with PDO/MySQLi — never concatenate raw SQL.

Short notes

DefMySQLi CONNECT — fetch marks by roll in the college DB.
Ruleprepared statement
Trapstring-concat SQL
Usethe college DB

<?php // PDO sketch (connection details omitted) // $pdo = new PDO($dsn, $user, $pass); // $stmt = $pdo->prepare("SELECT id, name FROM users WHERE id = ?"); // $stmt->execute([1]); // $row = $stmt->fetch(); $demo = ["id" => 1, "name" => "Asha"]; echo $demo["name"];

MySQLi CONNECT

Example

Short notes

Questions

MySQLi CONNECT

Example

Short notes

Questions