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Android Training (Storing data using SQLite)

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Android Training (Storing data using SQLite)

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Android Training (Storing data using SQLite)

  1. 1. Android Storing (SQLite) Android Training By Khaled Anaqwa
  2. 2. What is SQLite?  SQLite is an Open Source database. SQLite supports standard relational database features like (SQL syntax, transactions and prepared statements)  The database requires limited memory at runtime (approx. 250 KByte) which makes it a good candidate from being embedded into other runtimes.
  3. 3.  SQLite supports the data types TEXT (similar to String in Java), INTEGER (similar to long in Java) and REAL (similar to double in Java).  SQLite itself does not validate if the types written to the columns are actually of the defined type.
  4. 4. SQLite in Android  SQLite is embedded into every Android device.  Using an SQLite database in Android does not require a setup procedure or administration of the database.  You only have to define the SQL statements for creating and updating the database. Afterwards the database is automatically managed for you by the Android platform.
  5. 5. Creating and updating Database  To create and upgrade a database in your Android application you create a subclass of the SQLiteOpenHelper class.  In this class you need to override the following methods to create and update your database.  onCreate() - is called by the framework, if the database is accessed but not yet created.  onUpgrade() - called, if the database version is increased in your application code.
  6. 6. Reading or writing mode  The SQLiteOpenHelper class provides the getReadableDatabase() and getWriteableDatabase() methods to get access to an SQLiteDatabase object.  getReadableDatabase():Create and/or open a database (read-only database object will be returned)  getWriteableDatabase():Create and/or open a database that will be used for reading and writing(read-only database object will be returned)
  7. 7. How to create db public static final String TABLE_USERS = "users"; public static final String USER_ID = "_id"; public static final String USER_AGE = "age"; public static final String USER_EMAIL = "email"; public static final String USER_SEX = "sex"; public static final String USER_NAME = "name"; public static final String USER_PASSWORD = "password";
  8. 8. Create Table private static final String CREATE_USERS_TABLE = "create table ”+ TABLE_USERS + "(" + USER_ID + " integer primary key autoincrement, " + USER_NAME+ " text not null, " + USER_EMAIL + " text not null, ”+ USER_PASSWORD + " text not null," + USER_AGE + " text not null,”+ USER_SEX + " text not null);";
  9. 9. Fill Override methods public void onCreate(SQLiteDatabase database) { database.execSQL(CREATE_USERS_TA BLE); } public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { db.execSQL("DROP TABLE IF EXISTS " + TABLE_USERS); onCreate(db);
  10. 10. Model  Create Model
  11. 11. DAO  Create General interface  Implement DAO interface
  12. 12. interface DAO public interface DAO { public List<?> getAllItems(); public Object getItem(int id); public void updateItem(Object obj); public void deleteItem(Object obj); public int insertItem(Object obj); public SQLiteDatabase openDB(); public void closeDB(); }
  13. 13. Implement DAO  public class UsersDAOImp implements DAO  Override
  14. 14. Task  Create Animal Table (Phone_name,Image_ID,Price)  Create DAO Imp  Create ListView

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