The present invention extends to methods, systems, and computer program products for locally storing Web-based database data in a local relational database at a computer system and for managing and modifying the web-based database data from a web server. Embodiments of the present invention permit Web-based database data to be locally stored at a computer system to increase the efficiency of rendering the Web-based database data within a Web browser at the computer system. Web-based database data can be sandboxed per domain to mitigate (and possibly eliminate) the exposure of the Web-based database data to malicious computer systems. The local relational database may be managed and modified by a statement processor according to database statements generated by a statement generator on a web server.