In this video learn how queries are executed against Realm. Annyce reviews the various options available in the RealmQuery class.
- [Voiceover] Realm queries use the builder pattern.…This means that you can chain multiple clauses together…in order to filter your desired results.…Further, the data is never copied.…You have access to the actual objects instead…of just copy stored in memory.…This allows your Realm results to be auto-updated.…Such that once you run a query,…if anything changes to the underlying data store,…the results will automatically be updated.…
This is one of the reasons why we can say…that Realm behaves in a reactive manner.…Here's an example of the syntax needed…to execute a Realm query.…You start off by getting access…to the default Realm instance.…Then, you will call the where method on that instance,…specifying which room model you want to query…by its class name.…Then you can call any of the available conditions…that you desire to use in order to filter…the return results.…
Finally, you execute the query by means of one…of the many find methods.…Realm queries support a host of different conditions.…Here's a sampling of some of the available conditions.…
To begin, Annyce Davis reviews using the de facto data persistence solution available on Android: SQLite. She takes you through basic SQLite concepts—such as how to create a database wrapper and insert data into a table—as well as a few more advanced topics. Next, she covers working with Cupboard, an open-source project dedicated to simplifying your SQLite interactions. To wrap up, she dives into working with Realm, an object database solution designed with mobile devices in mind. Throughout the course, Annyce discusses establishing relationships between database tables, creating and running queries, as well as performing data migrations.
- Overview of SQLite
- Defining a database table's schema
- Exploring SQLite create table syntax
- Executing create table statements
- Inserting data with a foreign key relation
- Inspecting the database using a terminal
- Updating and deleting records
- Working with Cupboard
- Working with Realm
Skill Level Intermediate
Android App Development: Unit Testingwith James P White2h 58m Intermediate
1. SQLite Basics
2. SQLite Beyond the Basics
3. Working with Cupboard
4. Realm Basics
5. Realm Beyond the Basics
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