The ORDA features keep coming with 4D v17 R5! In a previous blog post, we showed you how to create generic queries with named placeholders for values. This post will focus on how to use placeholders for attribute paths (field names in tables).
By now you’ve surely noticed that ORDA queries are not only light and readable, they also make it easy to navigate through the entire data model using object-oriented concepts! In this blog post, we showed you how to write powerful and easy-to-maintain queries. One of the methods recommended was providing the query and values separately via placeholders. 4D v17 R5 takes placeholders a step further by allowing you to write generic ORDA queries: say hello to named placeholders for values!
Today’s episode is focused on the user interface to help you create nice looking lists and grids!
In the first and second episodes of this trilogy, we demonstrated the basics of ORDA using list boxes, entities, and entity selections. We also showed the way to use similar list boxes with distinct data sources and how to use Meta info expression to improve the list boxes’ graphics.
Today we’re going to have even more fun, with less code!
In the first episode of this trilogy, we demonstrated the basics of ORDA using list boxes, entities, and entity selections. Today, we’re going a bit deeper by running some queries that will take advantage of recursive relationships. We’ll also have a quick look at how to display list boxes nicely using the “meta info expression” property.
We can all agree that ORDA is a great 4D V17 feature. A kind of revolution in the way of thinking and programming. 4D databases will never be seen the same way as before.
ORDA allows you to conceive advanced applications in less time, with more readable and clean code. To show you the power of ORDA we’ve prepared a series of tips for you, divided into three episodes. In this first episode, we’ll demonstrate how links should now be considered more as entities and entity collections, and we’ll show you how listboxes can now be based on entity selections, rather than selections or arrays.
Watch the video of the ORDA announcement during the 4D Summit 2018 Keynote. It features Thomas Maul, VP of Product Strategy, introducing this progressive technology and explaining how using your database as an object can open a whole new world of possibilities for your 4D-based applications.
ORDA was one of the major announcements of 4D Summit 2018, opening a world of new possibilities in 4D. To learn more about ORDA and its benefits, check out this post to see how ORDA will change the way you work.
4D v17 introduces a new concept: ORDA. If you’re not familiar with ORDA yet, we’ve created a series of blog posts to explain how to use and take advantage of ORDA. When working with ORDA, you’re going to use entity selections, which are basically objects containing references to entities belonging to the same dataclass (i.e. table). One of the main benefits of ORDA, is the very simple and powerful ability of binding with forms.
In this blog post, you’ll learn how to display an entity selection in a list box. In fact, it’s very simple.
ORDA provides a great feature to channel data through filters and get aggregated values, by including a set of easily-understood aggregation operations that examine and perform calculations on the data sets. For example, the sum, average, count, min, and max methods are used to perform the operations which their names describe!
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