No cache version.
Caching disabled. Default setting for this page:enabled (code LNG204)If the display is too slow, you can disable the user mode to view the cached version.
SDO _DAS _Relational: : applyChanges
(^)
SDO_DAS_Relational::applyChanges — Applies the changes made to a data graph back to the database
Description
This function is EXPERIMENTAL. The behaviour of this function, its name, and surrounding documentation may change without notice in a future release of PHP. This function should be used at your own risk.
Given a PDO database handle and the special root object of a data graph, examine the change summary in the datagraph and applies the changes to the database. The changes that it can apply can be creations of data objects, deletes of data objects, and modifications to properties of data objects.
Parameters
- PDO_database_handle
-
Constructed using the PDO extension. A typical line to construct a PDO database handle might look like this:
$dbh = new PDO("mysql:dbname=COMPANYDB;host=localhost",DATABASE_USER,DATABASE_PASSWORD); - root_data_object
-
The special root object which is at the top of every SDO data graph.
Return Values
None. Note however that the datagraph that was passed is still intact and usable. Furthermore, if data objects were created and written back to a table with autogenerated primary keys, then those primary keys will now be set in the data objects. If the changes were successfully written, then the change summary associated with the datagraph will have been cleared, so that it is possible to now make further changes to the data graph and apply those changes in turn. In this way it is possible to work with the same data graph and apply changes repeatedly.
Errors/Exceptions
SDO_DAS_Relational::applyChanges() can throw an SDO_DAS_Relational_Exception if it is unable to apply all the changes correctly.
The Relational DAS starts a database transaction before beginning to apply the changes and will commit the transaction only if they are all successful. The Relational DAS generates qualified update and delete statements which contain a where clause that specifies that the row to be updated or deleted must contain the same values that it did when the data was first retrieved. This is how the optimistic concurrency is implemented. If any of the qualified update or delete statements fails to update or delete their target row, it may be because the data has been altered in the database in the meantime. In any event, if any update fails for any reason, the transaction is rolled back and an exception thrown. The exception will contain the generated SQL statement that failed.
The Relational DAS also catches any PDO exceptions and obtains PDO diagnostic information which it includes in an SDO_DAS_Relational_Exception which it then throws.
English translation
You have asked to visit this site in English. For now, only the interface is translated, but not all the content yet.If you want to help me in translations, your contribution is welcome. All you need to do is register on the site, and send me a message asking me to add you to the group of translators, which will give you the opportunity to translate the pages you want. A link at the bottom of each translated page indicates that you are the translator, and has a link to your profile.
Thank you in advance.
Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-sdo-das-relational.applychanges.html
The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.
References
These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.
