This package evaluates basic operators from relational algebra and SQL. It serves as a backend for visualisations and other frontend tools. The generation of single tuples as well as of whole relations can be observed via the classic visitor pattern.
jsSQL is built in vanilla javascript on purpose, to have a small set of dependencies and high compatibility with many browsers and versions. It can therefore be used from within a browser as is shown in the index.html where all required files are just included as scripts.
But this repository features an NPM package that wraps around the vanilla functionality.
- The most basic form of logic is an instance of
Predicate, which in turn holds a lambdaTuple -> bool. While this makes sense functionally, it isn't very clean when it comes to parsing queries from an input string, as it would require the usage ofevalsooner or later. Maybe expressions should be built dynamically as ASTs instead?