Schema updates are very common when developing database-backed applications, using migrations is a powerful way to avoid losing data needlessly. Learn how in this video.
- [Instructor] Database migrations are often required…when you need to retain perviously-stored records.…For instance, what if you had the following schema…to find for a user class with just a name field,…then later, it's decided that you need to add…a Boolean field to the user class,…which contains whether the user is active or not.…Making these types of changes without providing…any instructions leaves SQL Lite confused.…This is because a schema and version number…are associated with your database.…
As a result, when SQL Lite does not have instructions…for migrating to a new schema version,…then it will throw an exception and crash your application.…To avoid this, you will need to provide some instructions…on how to update your database tables.…The most basic way is to update your SQL Lite helper class.…You will override the onUpgrade method…and using Cupboard, you can make a call to upgrade tables.…
Well, what does this do?…Cupboard will loop over all of your registered classes…and it will first check to see if it's an existing table.…
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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