Save data locally
- 1. ©W3Engineers2018 Store Data locally 12th September
- 2. ©W3Engineers2018 Anjan Debnath Sr. Software Engineer
- 3. Store data locally Anjan Debnath Ways to store data in Android
- 4. Store data locally Anjan Debnath Shared Preference
- 5. Store data locally Anjan Debnath SQLite
- 6. Store data locally Anjan Debnath File Storage
- 7. Store data locally Anjan Debnath Content Provider
- 8. Store data locally Anjan Debnath Cloud Storage
- 9. Store data locally Anjan Debnath SQLite in detail ● Define a schema and contract ● Create a database using an SQL helper ● Put information into a database ● Read information from a database ● Delete information from a database ● Update a database ● Persisting database connection ● Debug your database
- 10. Store data locally Anjan Debnath Define a schema and contract ● One of the main principles of SQL databases is the schema: a formal declaration of how the database is organized. ● The schema is reflected in the SQL statements that you use to create your database. ● You may find it helpful to create a companion class, known as a contract class, which explicitly specifies the layout of your schema in a systematic and self-documenting way.
- 11. Store data locally Anjan Debnath Example
- 12. Store data locally Anjan Debnath Create a database using an SQL helper ● Once you have defined how your database looks, you should implement methods that create and maintain the database and tables.
- 13. Store data locally Anjan Debnath Put information into a database ● To access your database, instantiate your subclass of SQLiteOpenHelper ● Insert data into the database by passing a ContentValues object to the insert() method
- 14. Store data locally Anjan Debnath Read information from a database ● To read from a database, use the query() method, passing it your selection criteria and desired columns. ● The method combines elements of insert() and update(), except the column list defines the data you want to fetch (the "projection"), rather than the data to insert. ● The results of the query are returned to you in a Cursor object.
- 15. Store data locally Anjan Debnath Example
- 16. Store data locally Anjan Debnath Delete information from a database ● To delete rows from a table, you need to provide selection criteria that identify the rows to the delete() method. ● The mechanism works the same as the selection arguments to the query() method.
- 17. Store data locally Anjan Debnath Example
- 18. Store data locally Anjan Debnath Update a database ● When you need to modify a subset of your database values, use the update() method.
- 19. Store data locally Anjan Debnath Persisting database connection ● You should leave your database connection open for as long as you possibly need to access it. Typically, it is optimal to close the database in the onDestroy() of the calling Activity.
- 20. Store data locally Anjan Debnath Room Persistency Library ● The Room persistence library provides an abstraction layer over SQLite to allow for more robust database access while harnessing the full power of SQLite. ● Why Room? ● You have to write long repetitive code, which will be time-consuming as well as prone to mistakes. ● It is very difficult to manage SQL queries for a complex relational database.
- 21. Store data locally Anjan Debnath Room Annotation
- 22. Store data locally Anjan Debnath Room in detail ● Add the gradle dependencies in the build.gradle file. ● Create a data model class for the database table and annotate its table name and primary key. ● Create an interface class for Database access. Create abstract methods for CRUD operations. Add custom SQL query as a method. ● Create a Database class for database implementation. ● Declare and initialize an object for the Database class in your Activity or Fragment class.
- 23. Store data locally Anjan Debnath Add the gradle dependencies in the build.gradle file.
- 24. Store data locally Anjan Debnath Create a data model class
- 25. Store data locally Anjan Debnath Create an interface class for Database access
- 26. Store data locally Anjan Debnath Create a Database class for database implementation
- 27. Store data locally Anjan Debnath Declare and initialize an object for the Database class
- 28. Store data locally Anjan Debnath Sample Insert code
- 29. Store data locally Anjan Debnath Referrence ● https://developer.android.com/training/data-storage/sqlite ● http://demispb.blogspot.com/p/android-development.html ● https://developer.android.com/training/data-storage/room/ ● https://medium.freecodecamp.org/room-sqlite-beginner-tutorial-2e725e47bfab
- 30. Store data locally Anjan Debnath Assignment 1 (Database) ● Create a Movie database. ● Create 2 table name movies and directors. ● The movies table must have movie name and movie id as primary key. ● The directors table must have director name and director id as primary key. ● Create relation between 2 tables with foreign key. ● Using both SQLite and Room library you have to design your Database schema and tables.
- 31. Store data locally Anjan Debnath Assignment 2 (Android App) ● Create an Android app that must have 2 below Activity. ● Activity 1 should have 2 Edit text and a submit button. ● It should be the Sign up page and you should enter user name and password. ● This user name and password should be saved into Shared Preference. ● Use the user name and pass to Sign in. ● Activity 2 should have 2 Edit text and a submit button. ● You have to input Movie name and Director name and clicking on submit button it should be insert into Database. ● Use a Recycler View to display the Records from database.
- 32. Store data locally Anjan Debnath Diagram
- 33. Store data locally Anjan Debnath Mark Distribution ● Shared preference - 2 ● SQLite - 3 ● Room Library - 3 ● Complete assignment - 2 ● Total 10
- 34. Store data locally Anjan Debnath Q/A
- 35. Store data locally Anjan Debnath