Using PHP with Oracle Database 1. Do not delete this text because it is a placeholder for the generated list of main topics when run in a browser This tutorial shows you how to use PHP with Oracle Database 1. Approximately 2 hours. PHP is a popular web scripting language, and is often used to create database driven web sites. 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. If you are new to PHP, review the Appendix PHP Primer to gain an understanding of the PHP language. Before starting this Oracle By Example, please have the following prerequisites completed. Install Oracle Database 1. Start DRCP connection pooling. Create a user named PHPHOL with password of welcome. Install Oracles sample. HR schema and make the following changes create sequence empidseq start with 4. Also to simplify the example we remove this trigger otherwise. PYTHONHOL. JHISTEMPIDSTDATEPK constraint. Allow employees to be changed when testing the lab after hours. Install Apache and enable User. PL-SQL/110215_1121_TriggersinP9.png' alt='Pl Sql Trigger Insert Update Delete In Php' title='Pl Sql Trigger Insert Update Delete In Php' />Dir module for publichtml. Install PHP 5. 3. OCI8 1. 4 extension. Pl Sql Trigger Insert Update Delete In Php' title='Pl Sql Trigger Insert Update Delete In Php' />Whenever you need to connect to a database, you create a Connection object using the ADONewConnectiondriver function. NewADOConnectiondriver is an alternative. When using an array to create a list of keys and values for a select box generator which will consist of states I found using NULL as an index and empty value. In php. ini set oci. MYPHPAPP. Extract these files to your HOME location. This section of the tutorial shows how to use the PHP OCI8 extension directly with Oracle Database. Using the OCI8 extension directly gives programmers maximum control over application performance. To create a connection to Oracle that can be used for the lifetime of the. Pl Sql Trigger Insert Update Delete In Php' title='Pl Sql Trigger Insert Update Delete In Php' />Interview questions and Answers for Oracle Basics of PL SQL, Trigger, Procedure, Cursor, Package, Library. Firebird. Firebird supports multiple rowlevel, BEFORE or AFTER, INSERT, UPDATE, DELETE or any combination of thereof triggers per table, where they are always in. For INSERT, UPDATE and DELETE SQL statements executed directly against the database, most database providers return the count of rows affected. For stored procedures. What is the advantage to use trigger in your PL SQL. PHP script, perform the following steps. Review the code in HOMEpublichtmlconnect. Create connection to Oracle. Connected to Oracle. Close the Oracle connection. The ociconnect. In this case, Oracles Easy Connect connection string syntax is used. Introduction to PLSQL By Example. This is a simple introduction to Oracles PLSQL language. Basic knowledge of SQL is assumed. It is aimed especially at. PLSQL Procedural LanguageStructured Query Language is Oracle Corporations procedural extension for SQL and the Oracle relational database. PLSQL is available in. It consists of the hostname and the DB service name. The ociclose. function closes the connection. Any standard connections not explicitly. Open a Web browser and enter the following URL to. Connected to Oracle is displayed if the connection succeeds. Review the SQL in HOMEpublichtmlusersess. DD MON YY HH MI SS logontime. This is a SQL script file that you run in SQLPlus. Oracles command line SQL scripting tool. This. SQLlus script shows the current database sessions, and what time they. Open a terminal window and enter the following commands to run the SQL script. Note that you could also execute the script in SQL Developer. HOMEpublichtml. The SQLlus script lists the current database sessions. The only session shown is for SQLlus. The PHP connections from the ociconnect function has been closed. Edit HOMEpublichtmlconnect. Reload the connect. Now rerurn usersess. SQLlus. cd HOMEpublichtml. There should be two connected users. You may see more than two if you reloaded the page several times and Apache allocated different processes to handle the PHP script. By default, persistent connections stay open until the Apache process terminates. Subsequent PHP scripts can reuse the already opened connection, making them run faster. Database Resident Connection Pooling is a new feature of Oracle Database 1. It is useful for short lived scripts such as typically used by web applications. It allows the number of connections to be scaled as web site usage grows. It allows multiple Apache processes on multiple machines to share a small pool of database server processes. 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. Below left is diagram of nonpooling. Every script has its own database server proces. Scripts not doing any database work still hold onto a connection until the connection is closed and the server is terminated. Below right is a diagram with DRCP. Scripts can use database servers from a pool of servers and return them when no longer needed. Batch scripts doing long running jobs should generally use non pooled connections. This section of the tutorial shows. DRCP can be used by new or existing applications without writing or changing. Perform the following steps. Check that php has oci. Open a terminal window and execute the following command php r echo inigetoci. The connection class tells the database server pool. Session information such as the default. Session information will be discarded if a pooled server is. Review the code in HOMEpublichtmlquerypooled. Compare this code to the code in HOMEpublichtmlquerynonpooled. The only difference is the pooled. Easy Connect connection string in querypooled. To run the scripts, the Apache Benchmark tool is used. This command repeatedly loads a web page, measuring its performance. From a terminal window, execute the following ab c 1. The above command sends Apache 1. Now look at the number of database connections open. Open another terminal window, execute the following sqlplus phpholwelcome. PHPHOL The default DRCP pool MAXSIZE is 4. You see up to 4. 0 connections with PHPHOL username, depending on how many. Apache processes handled the ab requests. You may also need to execute the query while. Oracle manages the DRCP pool, shrinking it after a. Now, you will run the same command except run the. From a terminal window. Now look at the number of database connections open. Open another terminal window, execute the following sqlplus phpholwelcome. PHPHOL Many more rows than previously are returned. Data Communications And Networking 5Th Edition Pdf Download. The rows. with httpdlocalhost. TNS V1 V3correspond to a running Apache process holding a database. For PHP, Apache runs in a multi process mode, spawning. PHP script. Depending how. Apache allocated these processes to handle the ab requests. VSESSION. Compare the number of requests completed in each run. You might want to run each script a few times to warm up the caches. Performance of the scripts is roughly similar. For the small works loads used in these two files, the tiny overhead. But the non pooled script causes every. Apache process to open a separate connection to the database. For larger sites, or where memory is limited, the overall benefits of. DRCP are significant. A common task when developing Web applications is to query. Web browser. There are a number of. Oracle database, but the basics of querying. Parse. the statement for execution. Bind. data values optional. Execute. the statement. Fetch. the results from the database. To create a simple query, and display the results in an. HTML table, perform the following steps. Review the code in HOMEpublichtmlquery. Create connection to Oracle. Fetch each row in an associative array. OCIRETURNNULLSOCIASSOC. ENTQUOTES nbsp. lt td. The ociparse. function parses the statement. The ociexecute. The ocifetcharray. The htmlentities. HTML tags so it displays correctly. From your Web browser, enter the following URL to. The results of the query are displayed in the Web. The OCIASSOC parameter fetches the row as an associative arrary of column names and column data. Alternatively, the OCINUM parameter can be passed to ocifetcharray to fetch the row as a numeric array. Bind variables enable you to re execute. Bind variables improve code reusability, and can reduce the risk of SQL Injection. To use bind variables in this example, perform the following. Review the code in HOMEpublichtmlbind. Fetch the results in an associative array. OCIRETURNNULLSOCIASSOC. Create connection to Oracle. Use bind variable to improve resuability. SQL Injection attacks. EIDBV, myeid. ociexecutes.