Data Assist is not compatible with MySQLi at this time.
We are working on updating the extensions to work with MySQl, but that will take some time.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.