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After connecting to MariaDB, you must select a database to work with because many databases may exist. There are two ways to perform this task: from the command prompt or through a PHP script.
The Command Prompt
In choosing a database at the command prompt, simply utilize the SQL command ‘use’ −
[root@host]# mysql -u root -p Enter password:****** mysql> use PRODUCTS; Database changed mysql> SELECT database(); +-------------------------+ | Database | +-------------------------+ | PRODUCTS | +-------------------------+
Once you select a database, all subsequent commands will operate on the chosen database.
Note − All names (e.g., database, table, fields) are case sensitive. Ensure commands conform to the proper case.
PHP Select Database Script
PHP provides the mysql_select_db function for database selection. The function uses two parameters, one optional, and returns a value of “true” on successful selection, or false on failure.
Syntax
Review the following select database script syntax.
bool mysql_select_db( db_name, connection );
The description of the parameters is given below −
S.No | Parameter & Description |
---|---|
1 |
db_name This required parameter specifies the name of the database to use. |
2 |
connection When not specified, this optional parameter uses the most recent connection used. |
Try the following example code for selecting a database −
<html> <head> <title>Select a MariaDB Database</title> </head> <body> <?php $dbhost = ''localhost:3036''; $dbuser = ''guest1''; $dbpass = ''guest1a''; $conn = mysql_connect($dbhost, $dbuser, $dbpass); if(! $conn ) { die(''Could not connect: '' . mysql_error()); } echo ''Connected successfully''; mysql_select_db( ''PRODUCTS'' ); mysql_close($conn); ?> </body> </html>
On successful selection, you will see the following output −
mysql> Connected successfully
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