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        Previously on the blog
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        13. A new year, A new POG release
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        15. POG 2.5 Released
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        21. What's new in 2.1.0
        22. PHP Objects 2.1.0 (preview)
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        25. Searching base64 encoded text
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        27. POG UI Tips
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        29. PHP CRUD
        30. POG 2.0.1: A better code generator
        31. A look at the POG SOAP API
        32. POG 2.0.0 released
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        34. Generated abstraction v/s dynamic abstraction
        35. Zend Framework preview
        36. Coming soon: Generate Objects through SOAP
        37. Easily save images and files to a database
        38. PHP, Paypal & POG
        39. Five advanced Code Generator tips
        40. PHP Pagination using generated objects
        41. PHP Code Generator benchmarks
        42. Representing database objects using an AJAX Tree interface
        43. Using SETUP in a production environment
        44. Description of the generated object package
        45. Introducing PHP Object Generator version 1.6
        46. Using AJAX and PHP Object Generator
        47. When to use Object->SaveNew()
        48. Generating PHP objects in 2006
        49. Happy Holidays
        50. A short video of the POG Setup process
        51. A sneak peek at POG 1.6
        52. POG Tip: Field limits
        53. Previous versions.
        54. Searching the blog and tutorials sections
        55. Generating code with "Other" SQL data types
        56. Five general POG tips
        57. POG source code locations
        58. Microsoft SQL 2005 Express Edition
        59. Impatiently awaiting PHP 5.1 and PDO
        60. Php Object Generator goes open source
        61. POG generates PDO compatible code
        62. Oracle to offer free database
        63. POG Google group
        64. Database Wrappers and POG
        65. Revisions
        66. The generator blog
        67. An explanation of the 'Escape' function.
        68. Mirror, mirror
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        70. A php object-relational database tool
        71. A simple and flexible Object Oriented approach to PHP


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        When to use Object->SaveNew()

        written 4938 days ago

        While designing Php Object Generator, we wanted the Save() function to be ‘smart enough’ to know when to UPDATE a database record and when to do an INSERT. POG uses the objectId attribute to make this decision. The objectId attribute is an auto-increment field, which is automatically generated for all objects. The objectId is also by default, the primary key of the object. For more information, check out the Save CRUD method section of the tutorials. If the objectId is empty, POG will save the object to the database and assign the objectId after the INSERT. Upon subsequent calls to the Save() CRUD method of the same object, POG will UPDATE the corresponding row of the database. Therefore, using Save() does the job in almost all scenarios. Why then do we need the SaveNew() CRUD method?

        There are specific situations where you want to force a database INSERT and this is when SaveNew() comes in handy. There are 2 main situations I can think of: The first one is when you want to clone an object within the database. In other words, you simply want to duplicate a row of your the database. The second is security. SaveNew() guards against unintentionally updating a database record with corrupt data. A rare and specific way this could happen is if, for example, you’ve created a user registration form whose input field names match the attribute names of your object, and in your code, you’re looping through the $_POST array and matching the input fields to attributes of your object as follows:

        $keys = array_keys($_POST);
        foreach ($keys as $key)
        {
        $user->{$key} = (isset($_POST[$key]) ? $_POST[$key] : ‘’);
        }
        $user->Save();

        Someone could potentially create their own web form containing an input field called “userId” and perform a cross-domain POST to your script. The code above would grab the objectId value and assign it to the object. Upon Save(), POG will overwrite an existing record. This specific scenario can be avoided by using SaveNew() as follows:

        $keys = array_keys($_POST);
        foreach ($keys as $key)
        {
        $user->{$key} = (isset($_POST[$key]) ? $_POST[$key] : ‘’);
        }
        $user->SaveNew();

        In the case of a user registration system or whenever the application logic dictates that only an INSERT (no UPDATE) should be performed, SaveNew() is the safer choice.


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        About Php Object Generator
        This is a weblog about the Php Object Generator (POG) project, OO PHP, databases and Php code generators in general.

        Php Object Generator, (POG) is an open source PHP code generator which automatically generates clean & tested Object Oriented code for your PHP4/PHP5 application.

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