Deleting records in Realm is analogous to modifying them. The deletion must take place inside of a transaction, and then you can simply call the deleteFromRealm method. Annyce shows you a few examples in this video.
- [Instructor] Deleting records in realm…is analogous to modifying them.…The deletion must take place inside of a transaction,…and then you can simply call the delete from realm method.…In this example, we execute a query…to return the first user record,…and then we call the delete from realm method on the result.…One thing to realize about realm…is that at the time of this recording,…there is no cascading delete mechanism.…This means that if you have nested realm lists…or realm objects, in any given realm object,…then you have to delete those first,…and then finally, delete the container object.…
So let's say we use our user object with a nested email.…We get the email address, and then delete that first.…Then finally, we would delete the user object.…We can see this in action inside of our sample application.…Let's move over to Android Studio now.…We're back here in the data source class,…so let's create a new method, delete recipe.…We're going to add it…right underneath our modify description method.…
I'm just going to type public void deleteRecipe,…
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 59m 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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