Understanding EWDjs: Working with Global-based Databases

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

This lecture sets out the concept of projecting Globals as Persistent JavaScript Objects, and explains the GlobalNode Object and the basic, primitive properties and methods it exposes

This lecture introduces the $() method for GlobalNode Objects, which is the key to projecting physical Global Nodes on disc as persistent JavaScript Objects

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