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] Data-based migrations…are often required when you need…to retain previously stored records.…For instance, what if you had the following schema defined…for a user class and it only had the name field?…But then later, it's decided that you need…to add a boolean field to the user class…which contains whether or not the user is active.…Making these types of changes without providing…any instructions leaves SQLite confused.…This is because a schema inversion number…is associated with your data base.…
As a result, when SQLite does not have instructions…for migrating to a new scheme aversion…then it's going to throw an exception and crash your app.…To avoid this, you need to provide some instructions…on how to update your database tables.…Room provides a migration class which allows…you to specify how you want to move…from one scheme aversion to the next.…In the constructor, you specify the start and inversion.…Then inside of the migrate method,…you provide the SQL commands needed to update the schema.…
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
Q: This course was updated on 05/24/2018. What changed?
A: New videos were added that cover working with Room.
Learning Firebase Cloud Messaging for Androidwith Joe Marini52m 49s Intermediate
1. SQLite Basics
2. SQLite Beyond the Basics
3. Working with Room
4. Working with Cupboard
5. Realm Basics
6. Realm Beyond the Basics
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