Selecting MySQL Database


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Once you get connected with the MySQL server, it is required to select a database to work with. This is because there might be more than one database available with the MySQL Server.

Selecting MySQL Database from the Command Prompt

It is very simple to select a database from the mysql> prompt. You can use the SQL command use to select a database.

Example

Here is an example to select a database called TUTORIALS

[root@host]# mysql -u root -p
Enter password:******
mysql> use TUTORIALS;
Database changed
mysql> 

Now, you have selected the TUTORIALS database and all the subsequent operations will be performed on the TUTORIALS database.

NOTE − All the database names, table names, table fields name are case sensitive. So you would have to use the proper names while giving any SQL command.

Selecting a MySQL Database Using PHP Script

PHP provides function mysql_select_db to select a database. It returns TRUE on success or FALSE on failure.

Syntax

bool mysql_select_db( db_name, connection );

S. No. Parameter & Description
db_name Required − MySQL Database name to be selected
connection Optional − if not specified, then the last opened connection by mysql_connect will be used.

Example

Here is an example showing you how to select a database.

<html>
   <head>
      <title>Selecting MySQL Database</title>
   </head>
   <body>
      <?php
         $dbhost = 'localhost:3036';
         $dbuser = 'guest';
         $dbpass = 'guest123';
         $conn = mysql_connect($dbhost, $dbuser, $dbpass);
         if(! $conn ) {
            die('Could not connect: ' . mysql_error());
         }
         echo 'Connected successfully';
         mysql_select_db( 'TUTORIALS' );
         mysql_close($conn);
      ?>
   </body>
</html>


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