I'm using WebSql in my current project, so yes it can be done. ST provides no built-in support for WebSql, so we're pretty much on our own. Perhaps they are waiting for IndexedDB, but I'm not. No native support for joins, complex where clauses, aggregate functions? No thanks!
I ended up writing some custom objects to make working with the db and creating SQL statements a bit easier. I find the concept of proxies that only do CRUD to be a bit too simplistic when I have queries with all kinds of joins, where clauses, and aggregate functions, as well as business objects with methods that do more than one operation on more than one table in a transaction. I guess proxies work well with LocalStorage for fairly trivial things, but I ended up bypassing proxies, and instead opted to have methods on my models and stores with custom ad-hoc SQL.
Maybe others have had different approaches? I'll see if I can post some example code soon.
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