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        Previously on the blog
        RSS feed
        1. Using POG with Flex
        2. Optimizing your web application
        3. Regenerating large objects
        4. PHP4 or PHP5
        5. New and Improved
        6. Evolution of a cube
        7. POG Museum
        8. POG 3.0 alpha
        9. Initial Performance results Part 2
        10. Initial performance results
        11. Proposal: POG 3.0 object model
        12. Suggest a feature
        13. A new year, A new POG release
        14. Many-Many relations
        15. POG 2.5 Released
        16. POG 2.5 beta
        17. Automatic table alignment
        18. New version: 2.1.2 released
        19. RSS should work well now
        20. RSS feed glitches
        21. What's new in 2.1.0
        22. PHP Objects 2.1.0 (preview)
        23. PHP Object relations FAQ
        24. PHP Object Relations
        25. Searching base64 encoded text
        26. How to debug POG-generated objects
        27. POG UI Tips
        28. Featuring Of Interest links
        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
        33. Coming soon: Generate parent-child objects
        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
        69. Using POG to solve real world problems
        70. A php object-relational database tool
        71. A simple and flexible Object Oriented approach to PHP


        Want more Php Object Generator?
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        Searching base64 encoded text

        written 4786 days ago

        One rare aspect of POG that may require some ‘adaptation’ is that, by default, POG encodes all strings to base64 before inserting them in the database. This is done so that all dynamic SQL queries created by POG are SQL-safe and takes the hassle of having to escape unsafe strings away from the PHP developer. Another reason for base64 is that it is a database-independent format, and makes any pog-related code more portable, since POG supports multiple databases (mysql, postgresql, sqlite and so on).

        Read more about base64 and POG

        The one drawback that had to be worked around is that it is difficult to perform partial string matching search on a base64 encoded text. This is simply because of the way base64 encodes text. For example, the string

        The quick fox jumped over the lazy dog

        has a base64 encoded value of

        VGhlIHF1aWNrIGZveCBqdW1wZWQgb3ZlciB0aGUgbGF6eSBkb2cg

        So, if I were searching a database for this exact string, it wouldn’t be hard at all since I could create a query that looks like this:

        select record where base64_encoded_text = “VGhlIHF1aWNrIGZveCBqdW1wZWQgb3ZlciB0aGUgbGF6eSBkb2cg”;

        However, if I’m searching for all records that contain the word “dog” (“ZG9n” in base64), I can’t create the following query:

        *select record where base64_encoded_text like ’% ZG9n %’*

        since the string ZG9n is not present in VGhlIHF1aWNrIGZveCBqdW1wZWQgb3ZlciB0aGUgbGF6eSBkb2cg even though they both contain the word dog when decoded.

        2 solutions:
        There are 2 workarounds for this particular issue that I’ve identified up to now, and you can find them below. Since this is one of the most frequently asked question regarding POG, I hope these will be useful to you:

        Solution 1: Get all records, then filter
        In this scenario, the developer programs ‘around’ POG’s limitation and gets all records, or a subset of the records from the database using POG’s GetList() CRUD method. Then, the developer loops through all the returned records (which are POG objects), and then filters by the attribute being searched.

        Example:

        function Search($needle)
        {
        $filteredList = array();
        $bookList = $book -> GetList (array(array(“bookId”, ”>”, 0)));
        foreach ($bookList as $aBook)
        {
        if (strpos($aBook->text, $needle)
        {
        $filteredList[] = $aBook;
        }
        }

        return $filteredList();
        }

        The drawback in this solution is that the developer first needs to get all potential records and essentially do the work of the database. The key word here is potential. It is strongly suggested to find another condition that will reduce the number of potential records that need to be filtered.

        Solution 2: Implement base64 decode in the database
        This is a solution that can be extremely useful in big projects. I’ve personally used it in a large project I needed to tackle while using POG. The rational behind this method is as follows:

        If we teach the database to decode base64 strings, then we don’t have to return all potential records and filter them. Instead, we can let all the processing to the database, making it faster and simpler to code on the front-end. If the database has a function base64_decode, we can simply issue the following query:

        *select base64_decode(record) where plain_text like ’% dog %’;*

        Thus, instead of encoding the partial string we’re looking for, we simply decode the entire string on the database, and match the result with our partial string. This ensures that we’ll get all records that contain the word dog.

        Howto:
        MySQL doesn’t yet support base64 decode, so you’ll need to create a custom function to do that. As a starting point, feel free to take a look at this custom function base64.sql provided by Ian Gulliver (http://www.firestuff.org)

        Once your database is able to decode base64 strings, simply implement a Search() Method in your POG object(s) which queries the database using base64_decode.

        Previous discussions on partial string matching:
        Google group discussion #1
        Google group discussion #2

        Final Note: In POG 2.0+, developers are able to disable automatic encoding/decoding from within the POG’s configuration file, thus side-stepping the task of finding an elegant solution for partial string matching in base64-encoded strings.


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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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