Transcript
Android Persistance Datausing SQLite Database
How I am
Name : Arif Akbarul HudaJob : Lecture | Programmer | Book Writer | ResearcherOffice : qiscus , AMIKOM, homeSocmed : @omayib , http://id.linkedin.com/in/akbarul
My contribution...
Qiscus [kis-kas] (noun). Perusahaan teknologi yang menyediakan layanan pesan instan dan komunikasi untuk tempat kerja. Perusahaan ini didirikan di Singapura pada tahun 2013 dan memiliki pusat riset dan pengembangan teknologi di Yogyakarta, Indonesia.[1]
(https://id.wikipedia.org/wiki/Qiscus)
Lets begin
How they manage the data?
Saving dataShared
Preference
FileStorage
SQLite
Cloud
what kind of storage we need?It is depend on your data type and structure
SQLite Database[se-kyu-lait]
TodoList Application
Source :https://github.com/omayib/TodoList/tree/feature/sqlite
What is SQLite?
● Opensource db● For limited memory devices● Support SQL syntax dan transaction.
SQLite database file location
DATA/data/package/databases/fileDatabase.db
SQLite Data Type
● NULL● Integer● Real● Text● Bloob
SQLite Component
SQLiteOpenHelper
-onCreate()-onUpdgrade()
SqliteDatabase
- insert()- update()- delete()- execSQL()
Cursor
- getCount()- getInt()- getString()
A helper class to manage database creation and version management
has methods to create, delete, execute SQL commands,
and perform other common database management tasks
the result set returned by a database query
Simple and clean architecture
Design your code like a puzzle
Todolist Application Architechture
UI
Model domain repository
SQlite Cloud..
Todolist Application Architechture
LocalDatabaseConfiguration configDb = new LocalDatabaseConfiguration(this, “databaseName.db”, null, 1);
#1. Make a configuration for our SQLite database
#2. Initiate the repository
TodoRepository repo = new TodoRepository(configDb);
Database Creation
#4. insert an item
Todo newTodo = new Todo(”randomId”,”beli makan!”);repo.insert(newTodo);
#5. update an item
Todo itemTobUpdated = new Todo(”randomId”,”beli makan!”);repo.update(itemTobUpdated);
#6. update an item
Todo itemTobeDeleted = new Todo(”randomId”,”beli makan!”);repo.delete(itemTobeDeleted);
#3. get all todo items
List<Todo> todos = repo.findAll()
Database Querying
Show me the code!
Performance
E/Database(234): Leak foundE/Database(234): Caused by: java.lang.IllegalStateException: SQL iteDatabase created and never closed
Open the database but forgot to close it
Possible Solution :- make SQLiteDataBaseOpenHelper as Single Instance- initiate inside Application
public class DatabaseHelper extends SQLiteOpenHelper {
private static DatabaseHelper sInstance;
private static final String DATABASE_NAME = "database_name"; private static final String DATABASE_TABLE = "table_name"; private static final int DATABASE_VERSION = 1;
public static synchronized DatabaseHelper getInstance(Context context) {
if (sInstance == null) { sInstance = new DatabaseHelper(context.getApplicationContext()); } return sInstance; }
private DatabaseHelper(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); }}
public class TodoApplication extends Application {
private TodoRepository repository;
@Override public void onCreate() { super.onCreate();
LocalDatabaseConfiguration localDatabaseConfiguration =new LocalDatabaseConfiguration(this, LocalDatabaseConfiguration.DATABASE_NAME, null, LocalDatabaseConfiguration.DATABSE_VERSION); repository =new TodoRepository(localDatabaseConfiguration); }
public TodoRepository getRepository() { return repository; }}
ACID (atomic, consistent, isolated, durable)
Handling multiple transaction and large data
db.beginTransaction();
try {
for (int i= 0; i< values.lenght; i++){
// TODO prepare ContentValues object values
db.insert(your_table, null, values);
// In case you do larger updates
}
db.setTransactionSuccessful();
} finally {
db.endTransaction();
}
//
end
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