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MySQL Create, Select, Drop Database

You can easily create, select, drop any database using PHP functions made for MySQL



Creating a Database

You can create MySQL Database easily with PHP mysql_query() function.This mysql_query() function is used to query the database whenever we need to do operations in database we use mysql_query() function it returns TRUE on success or FALSE on failure.


You would need special privileges to create or to delete a MySQL database.


Syntax


mysql_query( sql, connection );

Code Explanation

  • sql: is the query used to create or delete the database

  • connection: it is an optional parameter if not specified, then last opened connection by mysql_connect will be used.


Example of Creating a Database


<?php

$host = 'localhost:3036';
$user = 'root';
$pass = '';

$conn = mysql_connect($host, $user, $pass);

if(! $conn )
{
  die('Could not connect: ' . mysql_error());
}

echo 'Connected successfully';

$sql = 'CREATE DATABASE Demodata';
$create = mysql_query( $sql );

if(! $create )
{
  die('Could not create database: ' . mysql_error());
}

echo "Database Demodata created successfully";

mysql_close($conn);

?>

When You run that program it create the database name Demodata in MySQL.



Select a Database

You can select any database easily with PHP mysql_select_db() function it returns TRUE on success or FALSE on failure.


Syntax


mysql_select_db( DatabaseName, connection );

Code Explanation

  • DatabaseName: it is the name of the database you want ot connect
  • connection: it is an optional parameter if not specified, then last opened connection by mysql_connect will be used.


<?php

$host = 'localhost:3036';
$user = 'root';
$pass = '';

$conn = mysql_connect($host, $user, $pass);

if(! $conn )
{
  die('Could not connect: ' . mysql_error());
}

echo 'Connected successfully';

mysql_select_db( 'Demodata' );
mysql_close($conn);

?>


Drop a Database

You can delete the database using PHP mysql_query() function whenever you want.



$sql = 'DROP DATABASE Demodata';

$delete = mysql_query( $sql );

if(! $delete )
{
  die('Could not delete database: ' . mysql_error());
}

echo "Database Demodata deleted successfully";

In this we delete the previously created database named Demodata.


In this example we use DROP because it means delete in SQL language.

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