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MySQL - Select Database

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

Selecting MySQL Database from Command Prompt:

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


Here is an example to select database called TUTORIALS:

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

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

Selecting MySQL Database Using PHP Script:

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

bool mysql_select_db( db_name, connection );
Parameter Description
db_nameRequired - MySQL Database name to be selected
connectionOptional - if not specified then last opened connection by mysql_connect will be used.

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

<title>Selecting MySQL Database</title>
$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' );