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Chapter 3 revealed that the oci_execute()function performs an automatic commit. The PEAR DB module is a superstructure, on top of database modules which are already a part of PHP.

The PEAR DB module that works with Oracle is built by using the oci_execute() function to execute SQL statements. PEAR DB, therefore, performs an automatic commit when connected to Oracle RDBMS. In contrast to the OCI8 module, which is procedural; PEAR DB is object oriented, and whatever is done with arguments to functions in OCI8 is performed by methods in PEAR DB.

The automatic commit is turned on or off by using the autocommit()method in the DB connection class. This is shown in the following example:


As in the OCI8 module, it is advisable to turn the automatic commit off when performing updates so that the transaction can be rolled back in case of an error.


The above book excerpt is from  "Easy Oracle PHP: Creating Dynamic Web Pages with Oracle Data". 

You can buy it direct from the publisher for 50%-off and get instant access to the code depot of Oracle tuning scripts:



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