MySQL Database Connection
Opening Database Connection
PHP provides mysql_connect function to open a database connection. This function takes five parameters and returns a MySQL link identifier on success, or FALSE on failure.
يوفر فتح اتصال قاعدة البيانات PHP وظيفة mysql_connect لفتح اتصال قاعدة البيانات. تأخذ هذه الوظيفة خمس معلمات وتعيد معرف ارتباط MySQL عند النجاح ، أو FALSE عند الفشل.
Syntax
connection mysql_connect(server,user,passwd,new_link,client_flag);
Sr.No | Parameter & Description |
---|---|
1 | server Optional − The host name running database server. If not specified then default value is localhost:3306. |
2 | user Optional − The username accessing the database. If not specified then default is the name of the user that owns the server process. |
3 | passwd Optional − The password of the user accessing the database. If not specified then default is an empty password. |
4 | new_link Optional − If a second call is made to mysql_connect() with the same arguments, no new connection will be established; instead, the identifier of the already opened connection will be returned. |
5 | client_flags Optional − A combination of the following constants −
|
NOTE − You can specify server, user, passwd in php.ini file instead of using them again and again in your every PHP scripts. Check php.ini file configuration.
Closing Database Connection
Its simplest function mysql_close PHP provides to close a database connection. This function takes connection resource returned by mysql_connect function. It returns TRUE on success or FALSE on failure.
إغلاق اتصال قاعدة البيانات هو أبسط وظيفة يوفرها mysql_close PHP لإغلاق اتصال قاعدة البيانات. تأخذ هذه الوظيفة مورد الاتصال الذي تم إرجاعه بواسطة دالة mysql_connect. تقوم بإرجاع TRUE عند النجاح أو FALSE عند الفشل.
Syntax
bool mysql_close ( resource $link_identifier );
If a resource is not specified then last opend database is closed.
Example
Try out following example to open and close a database connection −
<?php $dbhost = 'localhost:3036'; $dbuser = 'guest'; $dbpass = 'guest123'; $conn = mysql_connect($dbhost, $dbuser, $dbpass); if(! $conn ) { die('Could not connect: ' . mysql_error()); } echo 'Connected successfully'; mysql_close($conn); ?>
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