Taking it all offline with SQL Anywhere


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"This talk will examine how SQL Anywhere can help take your current PHP application offline by locally hosting, managing, serving, and synchronizing your PHP application and data with your current database.

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Taking it all offline with SQL Anywhere

  1. 1. Taking it all Offline with SQL Anywhere Eric Farrar, Product Manager Sybase iAnywhere September 17, 2008
  2. 2. Simple MySQL and PHP Blog
  3. 3. The Offline Problem
  4. 4. The Offline Problem Why not user Gears? App must be written in JavaScript No PHP code reuse Lack of encryption, security, strict referential integrity, etc How do you sync? What do we need to host an offline version of the application? Web Server Database PHP installation Synchronization
  5. 5. Enter SQL Anywhere SQL Anywhere is an enterprise caliber, full-featured, SQL relational database Sybase SQL Anywhere ≠ Sybase ASE Over 15 years old, over 10 million deployed seats Roots in the embedded and mobile space Supports triggers, stored procedures (SQL, PHP, Perl, Java, .NET), materialized views, full text search, full referential integrity, FIPS approved encryption, … 10 megabyte footprint 1 user 1000s of users 1 Megabytes 100s of Gigabytes
  6. 6. SQL Anywhere and PHP Newly re-written module for PHP API based off of the mysql API sasql_<FUNCTION NAME>() Supports: Prepared statements Stored procedures with INOUT parameters Multiple-result sets
  7. 7. What We Need Built-in HTTP server HTTP SOAP It is a database External Environments: PHP Perl .NET Java C (external libraries)
  8. 8. What We Need Cont. Built-in synchronization MySQL Oracle MS SQL Server IBM DB2 SQL Anywhere Sybase ASE
  9. 9. Stand-Alone Application Apache MySQL + PHP PHP Files
  10. 10. MobiLink and Synchronization MobiLink acts as a ‘sync server’ Makes a regular database connection to consolidated database Handles all synchronization traffic Set up in farms to scale out (> 100,000 syncing remotes) Write sync scripts to handle business logic of sync SQL (native dialect of consolidated database) .NET Java Conflicts detected at column or row level
  11. 11. Adding MobiLink MobiLink Server
  12. 12. Client Sync (dbmlsync) Uploads all changes to database since last sync All synchronization happens in a SINGLE transaction Any failures will cause a full rollback Sends both current value, and original synced value of rows Can be run on demanded, or scheduled
  13. 13. Sync!! Client Sync Server MobiLink Server
  14. 14. Syncing Files Offline PHP Files Client Sync Server MobiLink Server
  15. 15. Storing Files in the Database Offline PHP Files Client Sync Server MobiLink Server
  16. 16. Conflicts What if two people change the same blog post? Posts are stored a single row in the database Need to ‘merge’ the rows Solution: Use diff3 utility as our custom business logic diff3 requires: Original My changed copy Their changed copy
  17. 17. SQL Anywhere as a Server While this example has used SQL Anywhere as the remote, SQL Anywhere can also be used as the server
  18. 18. Where to get more information SQL Anywhere Web Forum http://groups.google.com/group/sql-anywhere-web-development/ My Blog – “Peering Behind the Browser” http://iablog.sybase.com/efarrar SQL Anywhere PHP Module page http://www.sybase.com/detail?id=1019698
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