Global-based databases are a little-known and relatively poorly-understood technology, and yet they are incredibly powerful multi-model NoSQL databases. EWDjs is primarily designed to integrate with and exploit the power of these databases, so anyone wishing to use EWDjs in the most effective way should take this course.
This course explains in detail how Global Storage works and how Global-based databases are accessed from Nodejs and EWDjs.
Students should already have an understanding of databases and should be familiar with both using and the concepts that underpin Nodejs and EWDjs.
The course mainly consists of video screencasts, but source code is included for the examples used during the course.
The course should take 2 - 3 hours to complete.
In this lecture we'll focus on loading and initialising the interface modules, and show how you open and close connections to Cache, GlobalsDB and GT.M
This lecture focuses on the main Global primitive APIs that allow you to set, get and delete Global Nodes
In this lecture you'll learn how to navigate around the subscripts of a set of nodes within a Global
In this lecture we introduce the GlobalNode Object's forEach() method, which greatly simplifies and clarifies the means by which you can traverse a Global's subscripts and contents
In this lecture we'll look at how and why forEach loops can be nested, and how to navigate to specific subscripts without an exhaustive traversal. We'll also see how to reverse the direction of a forEach loop.
In this lecture we'll look at how you can limit traversal of a Global's subscripts to those starting with a specified prefix, how you can traverse ranges of subscript values, and finally how you can traverse between a Global's leaf nodes.
In this lecture we introduce the _getDocument() and _setDocument() methods, which allow Global Storage to be treated as a Document Database
In this lecture we'll see how _getDocument() and _setDocument() map arrays between Global Storage and JSON, and how you can control this behaviour. We'll also see how you can adjust their behaviour to improve performance.
In this lecture, we look in detail at a simple EWDjs application that demonstrates the use of GlobalNode Objects to manipulate Global Storage
In this lecture, we examine in detail the EWDjs Session, which is made available to you as a GlobalNode Object
In this lecture we'll examine how GlobalNode Objects can be used to convey complex data to and from Cache or Mumps extrinsic functions, and in doing so provide a way to integrate legacy Mumps code into your EWDjs applications
My name is Rob Tweed. I'm a Director and co-founder of M/Gateway Developments Ltd, a UK company that, since 1996, has specialised in web and internet technologies, in particular in conjunction with the Caché and GT.M databases.
I'm the author of EWDjs, a Node.js-based framework for browser-based client/server applications. EWDjs is specifically designed for use with the Caché and GT.M technologies, but supports other NoSQL databases including MongoDB and can be used as a framework with any other database technology.
My IT career started at the Royal Marsden Hospital, the UK's premier cancer hospital based in London and Surrey, where I headed up the application development team within their Computer Department.
I spent 4 years working in the Healthcare IT team at Touche Ross Management Consultants in London, during which time (and for several years after) I was a key member of the NHS-Wide Networking Project team, one of Europe's largest-ever networking projects, managed by the NHS Management Executive.
After becoming an independent consultant in the mid-1990s, I have focused exclusively on web technologies, with a particular focus on their role in healthcare. I was the inspiration behindWebLink, a web gateway product that I and my fellow co-director Chris Munt created and sold toInterSystems, the vendor of Caché. I also developed InterSystems' WebLink Developer framework, the pre-cursor to EWDjs, and have consulted with and supported many of InterSystems' major customers around the world to help them build their web application projects. The largest of these customers is Quest Diagnostics in the USA who use both WebLink Developer and EWD (the immediate predecessor to EWDjs) to support their Care360 application: the world's largest Caché-based, internet-facing web application. I provide support to Quest Diagnostics for both EWD and WebLink Developer.
My technical expertise includes over 30 years' experience in the Mumps, Caché and GT.M technologies in not only healthcare but also a wide range of market sectors including financial services, online publishing and retail. Other experience includes:
I have presented at a wide range of conferences in the USA, UK and elsewhere, including Ajax World, Cloud Computing, EHI Live, London Node.js Users Group and InterSystems' Developers Conference.