How to manage a database from the playbook? some references found in the documentation? examples of use?
on webworks SDK (config.xml,index.html)
This is what you're looking for:
And search this forum for examples. People have either posted examples ont here or linked their Github projects.
An example application using HTML5 database
This is by far the best example on the forum. Have tried all the suggested ones but the DDLUK one explains the basic concept and serves as a great start project to modify.