We’re wrapping up week 9 of #JustCode with a web app that demonstrates a web service, JSON and SQLite. The web app functions as both an app with a UI and a web service. It lets you enter your own quotes which are saved in a SQLite database. The web service randomly fetches a quote and returns it as JSON.
Noted recently at the SQLizer blog, the SQL language was first created 43 years ago. And what is remarkable about that is that SQL is still used today. According to the Stack Overflow 2017 developer survey it is the #2 programming language. Not many languages remain in use for such a long period of time. Although we’re happy to also note that Xojo celebrated our 20th anniversary in 2016!
Using databases with web apps is not much different than using them with desktop apps, but there are a few things to keep in mind. The most important thing to note is that a web app allows multiple users. This means you’ll want your database connection to be unique for each user that connects to the web app, rather than global to the app itself (as is common in desktop apps). The simplest way to ensure this is to create the connection to your database in the WebSession.Open event handler, saving a reference to the connection as a property that you add to WebSession.
I recently had someone ask me how to reorder the columns in a SQLite table. As you may be aware, the SQLite ALTER table does not have a lot of functionality compared to other databases and it certainly doesn’t have a way to do this.
Everyone loves SQLite. It is everywhere, it is fast and it is easy to use. Want to know how to make it even faster?
SQLite has the ability to do full text searching and this feature is available with Xojo. Read on to learn how to best use it!