PHP MySQL create database

The database holds one or more tables .

You need CREATE Permission to create or delete MySQL database .

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Use MySQLi and PDO establish MySQL database

CREATE DATABASE Statement is used in the MySQL Create database .

In the following example , Created a new one called "myDB" The database of ：

example (MySQLi - object-oriented )

<?php $servername = "localhost"; $username = "username"; $password = "password"; // Create connection $conn = new mysqli($servername, $username, $password); // Detection connection if ($conn->connect_error) { die(" The connection fails : " . $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(); ?>

	Be careful ：  When you create a new database , You have to be mysqli Object specifies three parameters (servername, username and password). Tip:  If you use other ports （ The default is 3306）, Add an empty string to the database parameter , Such as : new mysqli("localhost", "username", "password", "", port)

example (MySQLi Procedural)

<?php $servername = "localhost"; $username = "username"; $password = "password"; // Create connection $conn = mysqli_connect($servername, $username, $password); // Detection connection if (!$conn) { die(" The connection fails : " . 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); ?>

Be careful ：  The following uses PDO Instance create database  myDBPDO :

example

Use PDO：

<?php
$servername = "localhost";
$username = "username";
$password = "password";

try {
    $conn = new PDO("mysql:host=$servername", $username, $password);

    //  Set up  PDO  The error mode is 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;
?>

Tips ：  Use PDO The biggest advantage of is that when there is a problem in the database query process, you can use exception classes to Dealing with problems . If try{ } Exception in code block , The script will stop executing and jump to the first catch(){ } Code block execution code . In the code block captured above, we output SQL Statement and generate an error message .