PHP & MySQL - Select Database Example

Quiz

PHP uses mysqli_select_db function to select the database on which queries are to be performed. This function takes two parameters and returns TRUE on success or FALSE on failure.

Syntax

mysqli_select_db ( mysqli $link , string $dbname ) : bool

Sr.No.	Parameter & Description
1	$link Required - A link identifier returned by mysqli_connect() or mysqli_init().
2	$dbname Required - Name of the database to be connected.

Sr.No.

Parameter & Description

$link

Required - A link identifier returned by mysqli_connect() or mysqli_init().

$dbname

Required - Name of the database to be connected.

Example

Try the following example to select a database −

Copy and paste the following example as mysql_example.php −

<html>
   <head>
      <title>Selecting MySQL Database</title>
   </head>
   <body>
      <?php
         $dbhost = 'localhost';
         $dbuser = 'root';
         $dbpass = 'root@123';
         $conn = mysqli_connect($dbhost, $dbuser, $dbpass);

         if(! $conn ) {
            die('Could not connect: ' . mysqli_error($conn));
         }
         echo 'Connected successfully<br />';
         $retval = mysqli_select_db( $conn, 'TUTORIALS' );

         if(! $retval ) {
            die('Could not select database: ' . mysqli_error($conn));
         }
         echo "Database TUTORIALS selected successfully\n";
         mysqli_close($conn);
      ?>
   </body>
</html>

Output

Access the mysql_example.php deployed on apache web server and verify the output.

Database TUTORIALS selected successfully

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