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Session information (such as the defaultĭate format) might be retained between connection calls, giving performanceīenefits. The connection class tells the database server pool Open a terminal window and execute the following command: php -r 'echo ini_get("nnection_class"), "\n" ' How DRCP can be used by new or existing applications without writing or changingĪny application logic. Scripts can use database servers from a pool of servers and return them when no longer needed.īatch scripts doing long running jobs should generally use non-pooled connections. Scripts not doing any database work still hold onto a connection until the connection is closed and the server is terminated. Every script has its own database server proces. Without DRCP, a non-persistent PHP connection must start and terminate a server process, and a persistent PHP connection keeps hold of database resources even when PHP is idle.īelow left is diagram of nonpooling. It allows multiple Apache processes on multiple machines to share a small pool of database server processes. It allows the number of connections to be scaled as web site usage grows. It is useful for short lived scripts such as typically used by web applications. Using Database Resident Connection Poolingĭatabase Resident Connection Pooling is a new feature of Oracle Database 11g. Subsequent PHP scripts can reuse the already opened connection, making them run faster. By default, persistent connections stay open until the Apache process terminates. You may see more than two if you reloaded the page several times and Apache allocated different processes to handle the PHP script. Sqlplus -l phphol/welcome should be two connected users. Reload the connect.php script in the browser. $conn = oci_pconnect("phphol", "welcome", "//localhost/orcl") The PHP connections from the oci_connect() function has been closed.Įdit $HOME/public_html/connect.php and change oci_connect() to use a persistent connection oci_pconnect(). Sqlplus -l phphol/welcome SQL*Plus script lists the current database sessions. Note that you could also execute the script in SQL Developer. Open a terminal window and enter the following commands to run the SQL script.
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SQL*Plus script shows the current database sessions, and what time they (Oracle's command-line SQL scripting tool). This is a SQL script file that you run in SQL*Plus Select username, to_char(logon_time, 'DD-MON-YY HH:MI:SS') logon_time Review the SQL in $HOME/public_html/usersess.sql column username format a30 Open a Web browser and enter the following URL toĭisplay the output: "Connected to Oracle!" is displayed if the connection succeeds. Any standard connections not explicitlyĬlosed will be automatically released when the script ends. It consists of the hostname and the DB service name.įunction closes the connection. In this case, Oracle's Easy Connect connection string syntax is used.
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Review the code in $HOME/public_html/connect.php įunction contains the username, the password and the connection string. To create a connection to Oracle that can be used for the lifetime of the Using the OCI8 extension directly gives programmers maximum control over application performance.
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This section of the tutorial shows how to use the PHP OCI8 extension directly with Oracle Database. In php.ini set: nnection_class = MYPHPAPPĮxtract these files to your $HOME location.
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Install PHP 5.3.3 with the OCI8 1.4 extension. Install Apache and enable UserDir module for public_html Allow employees to be changed when testing the lab after hours. PYTHONHOL.JHIST_EMP_ID_ST_DATE_PK constraint
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records can only be updated once without violating the Also to simplify the example we remove this trigger otherwise Select emp_id_seq.nextval into :new.employee_id from dual HR schema and make the following changes: create sequence emp_id_seq start with 400 Prerequisitesīefore starting this Oracle By Example, please have the following prerequisites completed:Įxecute dbms_connection_pool.start_pool() Įxecute dbms_connection_pool.restore_defaults() Ĭreate a user named PHPHOL with password of 'welcome'. If you are new to PHP, review the Appendix: PHP Primer to gain an understanding of the PHP language. This tutorial helps you get started with PHP and Oracle Database by showing how to build a web application and by giving techniques for using PHP with Oracle. PHP is a popular web scripting language, and is often used to create database-driven web sites. This tutorial shows you how to use PHP with Oracle Database 11g.