Curriculum

PHP Basic

PHP Intro

0/1

PHP Install

0/1

PHP Syntax

0/1

PHP Comments

0/2

PHP Variables

0/4

PHP echo / print

0/3

PHP Data Types

0/7

PHP Strings

0/5

PHP Numbers

0/2

PHP Casting

0/1

PHP Math

0/1

PHP Constants

0/1

PHP Magic Constants

0/1

PHP Operators

0/1

PHP if...Else...Elseif

0/5

PHP switch

0/1

PHP Loops

0/7

PHP Functions

0/6

PHP Arrays

0/11

PHP Superglobals

0/7

PHP RegEx

0/1

PHP Form

0/9

PHP Advanced

0/15

PHP OOP

0/14

MySQL Database

0/14

PHP XML

0/5

PHP Reference

0/276

Text lesson

MySQL Create DB

PHP Create a MySQL Database

A database comprises one or more tables.

To create or delete a MySQL database, you must have special CREATE privileges.

Create a MySQL Database Using MySQLi and PDO

The CREATE DATABASE statement is used to create a database in MySQL.

The following examples show how to create a database named “myDB”:

Example (MySQLi Object-oriented)

<?php
$servername = “localhost”;
$username = “username”;
$password = “password”;

// Create connection
$conn = new mysqli($servername, $username, $password);
// Check connection
if ($conn->connect_error) {
  die(“Connection failed: “ . $conn->connect_error);
}

// Create database
$sql = “CREATE DATABASE myDB”;
if ($conn->query($sql) === TRUE) {
  echo “Database created successfully”;
} else {
  echo “Error creating database: “ . $conn->error;
}

$conn->close();
?>

Note: When creating a new database, you only need to specify the first three arguments for the mysqli object (servername, username, and password).

Tip: If you need to use a specific port, provide an empty string for the database-name argument, like this: new mysqli("localhost", "username", "password", "", port).

Example (MySQLi Procedural)

<?php
$servername = “localhost”;
$username = “username”;
$password = “password”;

// Create connection
$conn = mysqli_connect($servername, $username, $password);
// Check connection
if (!$conn) {
  die(“Connection failed: “ . mysqli_connect_error());
}

// Create database
$sql = “CREATE DATABASE myDB”;
if (mysqli_query($conn, $sql)) {
  echo “Database created successfully”;
} else {
  echo “Error creating database: “ . mysqli_error($conn);
}

mysqli_close($conn);
?>

Note: The following PDO example creates a database named “myDBPDO”:

Example (PDO)

<?php
$servername = “localhost”;
$username = “username”;
$password = “password”;

try {
  $conn = new PDO(“mysql:host=$servername”, $username, $password);
  // set the PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$sql = “CREATE DATABASE myDBPDO”;
  // use exec() because no results are returned
$conn->exec($sql);
  echo “Database created successfully<br>”;
} catch(PDOException $e) {
  echo $sql . “<br>” . $e->getMessage();
}

$conn = null;
?>

Tip: A key advantage of PDO is its exception class, which manages issues that may arise during database queries. If an exception is thrown within the try { } block, the script halts and directly transfers control to the first catch { } block. In the catch block, we echo both the SQL statement and the generated error message.