mariadb

Khóa học miễn phí MariaDB – Drop Database nhận dự án làm có lương

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MariaDB – Drop Database

Creation or deletion of databases in MariaDB requires privileges, typically, only given to root users or admins. Under these accounts, you have two options for deleting a database: the mysqladmin binary and a PHP script.

Note that deleted databases are irrecoverable, so exercise care in performing this operation. Furthermore, PHP scripts used for deletion do not prompt you with a confirmation before the deletion.

mysqladmin binary

The following example demonstrates how to use the mysqladmin binary to delete an existing database −

[root@host]# mysqladmin -u root -p drop PRODUCTS
Enter password:******
mysql> DROP PRODUCTS
ERROR 1008 (HY000): Can''t drop database ''PRODUCTS database doesn''t exist

PHP Drop Database Script

PHP employs the mysql_query function in deleting MariaDB databases. The function uses two parameters, one optional, and returns either a value of “true” when successful, or “false” when not.

Syntax

Review the following drop database script syntax −

bool mysql_query( sql, connection );

The description of the parameters is given below −

Sr.No Parameter & Description
1

sql

This required parameter consists of the SQL query needed to perform the operation.
2

connection

When not specified, this optional parameter uses the most recent connection used.

Try the following example code for deleting a database −

<html>
   <head>
      <title>Delete a MariaDB Database</title>
   </head>

   <body>
      <?php
         $dbhost = ''localhost:3036
         $dbuser = ''root
         $dbpass = ''rootpassword
         $conn = mysql_connect($dbhost, $dbuser, $dbpass);
      
         if(! $conn ) {
            die(''Could not connect: '' . mysql_error());
         }
         echo ''Connected successfully<br />
         
         $sql = ''DROP DATABASE PRODUCTS
         $retval = mysql_query( $sql, $conn );
         
         if(! $retval ){
            die(''Could not delete database: '' . mysql_error());
         }

         echo "Database PRODUCTS deleted successfullyn";
         mysql_close($conn);
      ?>
   </body>
</html>

On successful deletion, you will see the following output −

mysql> Database PRODUCTS deleted successfully

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