How to Validate User Properties With Regular Expressions
When working with data, particularly user-submitted data, you often need to validate it. For example, if we are creating a database in which there is a “site” field and corresponding IP address field, it would be very useful to ensure that the data written to these fields is in the appropriate format.
How We Store Emojis in Your Database, or Why We Got Rid of the Extended String Data Type
As you may have noticed in our release history, the EXTENDED STRING data type was removed from Backendless Database almost a year ago. To be precise, it was more a merge of the STRING and EXTENDED STRING data than the removal of the latter. This means now you can safely use STRING data type for…
Backendless Spotlight – Live Love Cite
This week, Backendless Spotlight takes a closer look at Live Love Cite, a mobile app built for the residents of the Cité Internationale Universitaire de Paris. The app acts as a social tool where users can post events, jobs, and items they are looking to sell on the marketplace. Live Love Cite is available on iOS and Android….
How to Use Backendless with ReactJS
ReactJS is one of the best and most popular frontend frameworks available for app builders. The barriers to entry in terms of understanding how to develop an app with ReactJS are very low, which is why many JavaScript developers choose the ReactJS library for web or mobile applications. It also works very well with a large number of…
Backendless Spotlight – Lifebook
In this week’s Backendless Spotlight, we are going to introduce you to a startup company out of Beirut, Lebanon, called Lifebook. Lifebook is a mobile app and physical product company that allows users to design their own custom photo album through the app, then have it printed and delivered to them as a hand-crafted, leatherbound…
Backendless Spotlight – Educators International
In this week’s Backendless Spotlight, we would like to introduce you to a nonprofit company that is using Backendless to support educational apps that are bringing literacy to some of the poorest countries in the world. Educators International is a U.K.-based charity that produces apps designed to help teachers in poor countries learn new instructional…
Building a Xamarin ToDo List with Backendless
We like to think of Backendless as being frontend agnostic. In other words, you can use Backendless for your backend almost regardless of how you build your application’s frontend. As such, it is very easy to use Backendless with Xamarin, an increasingly popular open-source native app builder by Microsoft. You can try out Xamarin for…
How to Save Published Messages in Your Database
In this article, we’ll talk about Backendless publish-subscribe messaging. One of the more common questions we receive is, “How can I get messages long after they are published?” The default mechanism in Backendless keeps messages in the published channel for a short period of time only (around a minute). This becomes a problem if a…
Introducing Aggregate Functions – Average, Count, Sum, Max and Min
Performing a calculation on a group of database objects may be a complex task. For example, to calculate the sum of all orders for a customer would require retrieving all that customer’s orders then iterating over them to calculate the mathematical sum of all amounts. This was yesterday! As of Backendless 4.4.0, you can use aggregate functions…