1. Android Databases

2. Android Databases
Comparación | Alternativas

3. SQLite

4. SQLite
Sencillo
Ligero
Embebido

6. API Nativa

7. API Nativa
SQLiteOpenHelper
SQLiteDatabase
Cursor

8. Extender SQLiteOpenHelper
public static final String DATABASE_NAME = "contacts.db";
public static final int DATABASE_VERSION = 1;
public static final String TABLE_CONTACTS = "contact";
public static final String FIELD_ID = "_id";
public static final String FIELD_NAME = "name";
public static final String FIELD_NUMBER = "number";
public SampleSQLiteHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + TABLE_CONTACTS + "( "
+ FIELD_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ FIELD_NAME + " TEXT, "
+ FIELD_NUMBER + " NUMBER);");
}
1

9. Extender SQLiteOpenHelper
public static final String DATABASE_NAME = "contacts.db";
public static final int DATABASE_VERSION = 1;
public static final String TABLE_CONTACTS = "contact";
public static final String FIELD_ID = "_id";
public static final String FIELD_NAME = "name";
public static final String FIELD_NUMBER = "number";
public SampleSQLiteHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + TABLE_CONTACTS + "( "
+ FIELD_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ FIELD_NAME + " TEXT, "
+ FIELD_NUMBER + " NUMBER);");
}
1

10. Extender SQLiteOpenHelper
public static final String DATABASE_NAME = "contacts.db";
public static final int DATABASE_VERSION = 1;
public static final String TABLE_CONTACTS = "contact";
public static final String FIELD_ID = "_id";
public static final String FIELD_NAME = "name";
public static final String FIELD_NUMBER = "number";
public SampleSQLiteHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + TABLE_CONTACTS + "( "
+ FIELD_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ FIELD_NAME + " TEXT, "
+ FIELD_NUMBER + " NUMBER);");
}
1

11. Extender SQLiteOpenHelper
public static final String DATABASE_NAME = "contacts.db";
public static final int DATABASE_VERSION = 1;
public static final String TABLE_CONTACTS = "contact";
public static final String FIELD_ID = "_id";
public static final String FIELD_NAME = "name";
public static final String FIELD_NUMBER = "number";
public SampleSQLiteHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + TABLE_CONTACTS + "( "
+ FIELD_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ FIELD_NAME + " TEXT, "
+ FIELD_NUMBER + " NUMBER);");
}
1

12. Extender SQLiteOpenHelper
public static final String DATABASE_NAME = "contacts.db";
public static final int DATABASE_VERSION = 1;
public static final String TABLE_CONTACTS = "contact";
public static final String FIELD_ID = "_id";
public static final String FIELD_NAME = "name";
public static final String FIELD_NUMBER = "number";
public SampleSQLiteHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + TABLE_CONTACTS + "( "
+ FIELD_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ FIELD_NAME + " TEXT, "
+ FIELD_NUMBER + " NUMBER);");
}
1

13. Usar SQLiteDatabase (leer)
mDbHelper = new SampleSQLiteHelper(this);
!
SQLiteDatabase db = mDbHelper.getReadableDatabase();
String[] projection = {FIELD_ID, FIELD_NAME, FIELD_NUMBER};
String sortOrder = FIELD_NAME;
Cursor cursor = db.query(TABLE_CONTACTS, projection, null, null,
null, null, sortOrder);
SimpleCursorAdapter adapter = new SimpleCursorAdapter(
this,
android.R.layout.simple_list_item_2,
cursor,
new String[]{FIELD_NAME, FIELD_NUMBER},
new int[]{android.R.id.text1, android.R.id.text2}
);
setListAdapter(adapter);
db.close();
2

14. Usar SQLiteDatabase (leer)
mDbHelper = new SampleSQLiteHelper(this);
!
SQLiteDatabase db = mDbHelper.getReadableDatabase();
String[] projection = {FIELD_ID, FIELD_NAME, FIELD_NUMBER};
String sortOrder = FIELD_NAME;
Cursor cursor = db.query(TABLE_CONTACTS, projection, null, null,
null, null, sortOrder);
SimpleCursorAdapter adapter = new SimpleCursorAdapter(
this,
android.R.layout.simple_list_item_2,
cursor,
new String[]{FIELD_NAME, FIELD_NUMBER},
new int[]{android.R.id.text1, android.R.id.text2}
);
setListAdapter(adapter);
db.close();
2

15. Usar SQLiteDatabase (leer)
mDbHelper = new SampleSQLiteHelper(this);
!
SQLiteDatabase db = mDbHelper.getReadableDatabase();
String[] projection = {FIELD_ID, FIELD_NAME, FIELD_NUMBER};
String sortOrder = FIELD_NAME;
Cursor cursor = db.query(TABLE_CONTACTS, projection, null, null,
null, null, sortOrder);
SimpleCursorAdapter adapter = new SimpleCursorAdapter(
this,
android.R.layout.simple_list_item_2,
cursor,
new String[]{FIELD_NAME, FIELD_NUMBER},
new int[]{android.R.id.text1, android.R.id.text2}
);
setListAdapter(adapter);
db.close();
2

16. Usar SQLiteDatabase (leer)
mDbHelper = new SampleSQLiteHelper(this);
!
SQLiteDatabase db = mDbHelper.getReadableDatabase();
String[] projection = {FIELD_ID, FIELD_NAME, FIELD_NUMBER};
String sortOrder = FIELD_NAME;
Cursor cursor = db.query(TABLE_CONTACTS, projection, null, null,
null, null, sortOrder);
SimpleCursorAdapter adapter = new SimpleCursorAdapter(
this,
android.R.layout.simple_list_item_2,
cursor,
new String[]{FIELD_NAME, FIELD_NUMBER},
new int[]{android.R.id.text1, android.R.id.text2}
);
setListAdapter(adapter);
db.close();
2

17. Usar SQLiteDatabase (leer)
mDbHelper = new SampleSQLiteHelper(this);
!
SQLiteDatabase db = mDbHelper.getReadableDatabase();
String[] projection = {FIELD_ID, FIELD_NAME, FIELD_NUMBER};
String sortOrder = FIELD_NAME;
Cursor cursor = db.query(TABLE_CONTACTS, projection, null, null,
null, null, sortOrder);
SimpleCursorAdapter adapter = new SimpleCursorAdapter(
this,
android.R.layout.simple_list_item_2,
cursor,
new String[]{FIELD_NAME, FIELD_NUMBER},
new int[]{android.R.id.text1, android.R.id.text2}
);
setListAdapter(adapter);
db.close();
2

18. Usar SQLiteDatabase (escribir)
SQLiteDatabase db = mDbHelper.getWritableDatabase();
ContentValues values = new ContentValues(2);
values.put(FIELD_NAME, contactName);
values.put(FIELD_NUMBER, contactNumber);
db.insert(TABLE_CONTACTS, null, values);
db.close();
3

19. Usar SQLiteDatabase (escribir)
SQLiteDatabase db = mDbHelper.getWritableDatabase();
ContentValues values = new ContentValues(2);
values.put(FIELD_NAME, contactName);
values.put(FIELD_NUMBER, contactNumber);
db.insert(TABLE_CONTACTS, null, values);
db.close();
3

20. Usar SQLiteDatabase (escribir)
SQLiteDatabase db = mDbHelper.getWritableDatabase();
ContentValues values = new ContentValues(2);
values.put(FIELD_NAME, contactName);
values.put(FIELD_NUMBER, contactNumber);
db.insert(TABLE_CONTACTS, null, values);
db.close();
3

21. Usar SQLiteDatabase (escribir)
SQLiteDatabase db = mDbHelper.getWritableDatabase();
ContentValues values = new ContentValues(2);
values.put(FIELD_NAME, contactName);
values.put(FIELD_NUMBER, contactNumber);
db.insert(TABLE_CONTACTS, null, values);
db.close();
3

22. API Nativa

23. API Nativa
Simple (no sencilla)
Documentación
Control y rendimiento
Más código, más sucio
Tendencia a errores
Difícil de mantener

25. ORM Lite

26. ORM Lite
Modelo Java
OrmLiteSqliteOpenHelper
DAO

27. Definir modelo (Contacto)
@DatabaseTable
public class Contact {
@DatabaseField(generatedId = true)
private int id;
@DatabaseField
private String name;
@DatabaseField(foreign = true, foreignAutoRefresh =
true, foreignAutoCreate = true)
private PhoneNumber phoneNumber;
}
1

28. Definir modelo (Teléfono)
@DatabaseTable
public class PhoneNumber {
@DatabaseField(generatedId = true)
private int id;
@DatabaseField
private int number;
}
1

29. Extender OrmLiteSqliteOpenHelper
private static final int DB_VERSION = 1;
private static final String DB_NAME = "contacts.db";
public DbHelper(Context context) {
super(context, DB_NAME, null, DB_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db, ConnectionSource cs) {
try {
TableUtils.createTable(cs, Contact.class);
TableUtils.createTable(cs, PhoneNumber.class);
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
2

30. Extender OrmLiteSqliteOpenHelper
private static final int DB_VERSION = 1;
private static final String DB_NAME = "contacts.db";
public DbHelper(Context context) {
super(context, DB_NAME, null, DB_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db, ConnectionSource cs) {
try {
TableUtils.createTable(cs, Contact.class);
TableUtils.createTable(cs, PhoneNumber.class);
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
2

31. private RuntimeExceptionDao<Contact, Integer> contactDao;
private RuntimeExceptionDao<PhoneNumber, Integer> phoneDao;
!
!
!
public RuntimeExceptionDao<Contact, Integer> getDaoContact() {
if (contactDao == null) {
contactDao = getRuntimeExceptionDao(Contact.class);
}
return contactDao;
}
public RuntimeExceptionDao<PhoneNumber, Integer> getDaoPhone() {
if (phoneDao == null) {
phoneDao = getRuntimeExceptionDao(PhoneNumber.class);
}
return phoneDao;
}
2 Extender OrmLiteSqliteOpenHelper (DAO)

32. private RuntimeExceptionDao<Contact, Integer> contactDao;
private RuntimeExceptionDao<PhoneNumber, Integer> phoneDao;
!
!
!
public RuntimeExceptionDao<Contact, Integer> getDaoContact() {
if (contactDao == null) {
contactDao = getRuntimeExceptionDao(Contact.class);
}
return contactDao;
}
public RuntimeExceptionDao<PhoneNumber, Integer> getDaoPhone() {
if (phoneDao == null) {
phoneDao = getRuntimeExceptionDao(PhoneNumber.class);
}
return phoneDao;
}
2 Extender OrmLiteSqliteOpenHelper (DAO)

33. private RuntimeExceptionDao<Contact, Integer> contactDao;
private RuntimeExceptionDao<PhoneNumber, Integer> phoneDao;
!
!
!
public RuntimeExceptionDao<Contact, Integer> getDaoContact() {
if (contactDao == null) {
contactDao = getRuntimeExceptionDao(Contact.class);
}
return contactDao;
}
public RuntimeExceptionDao<PhoneNumber, Integer> getDaoPhone() {
if (phoneDao == null) {
phoneDao = getRuntimeExceptionDao(PhoneNumber.class);
}
return phoneDao;
}
2 Extender OrmLiteSqliteOpenHelper (DAO)

34. mDbHelper = new SampleSQLiteHelper(this);
!
List<Contact> contacts = mDbHelper.getDaoContact().queryForAll();
setListAdapter(new ContactAdapter(this, contacts));
3 Usar DAOs (leer)

35. mDbHelper = new SampleSQLiteHelper(this);
!
List<Contact> contacts = mDbHelper.getDaoContact().queryForAll();
setListAdapter(new ContactAdapter(this, contacts));
3 Usar DAOs (leer)

36. mDbHelper = new SampleSQLiteHelper(this);
!
List<Contact> contacts = mDbHelper.getDaoContact().queryForAll();
setListAdapter(new ContactAdapter(this, contacts));
3 Usar DAOs (leer)
*

37. public class ContactAdapter extends BaseAdapter {
// ...
@Override
public View getView(int position, View v, ViewGroup p) {
v = inflater.inflate(android.R.layout.simple_list_item_2, p, false);
Contact contact = getItem(position);
TextView text1 = (TextView) v.findViewById(android.R.id.text1);
TextView text2 = (TextView) v.findViewById(android.R.id.text2);
text1.setText(contact.getName());
text2.setText(contact.getPhoneNumber().getNumber().toString());
return v;
}
}
* Extra: BaseAdapter

38. Contact contact = new Contact();
contact.setName(name);
PhoneNumber phoneNumber = new PhoneNumber();
phoneNumber.setNumber(number);
contact.setPhoneNumber(phoneNumber);
mDbHelper.getDaoContact().create(contact);
3 Usar DAOs (escribir)

39. Contact contact = new Contact();
contact.setName(name);
PhoneNumber phoneNumber = new PhoneNumber();
phoneNumber.setNumber(number);
contact.setPhoneNumber(phoneNumber);
mDbHelper.getDaoContact().create(contact);
3 Usar DAOs (escribir)

40. Contact contact = new Contact();
contact.setName(name);
PhoneNumber phoneNumber = new PhoneNumber();
phoneNumber.setNumber(number);
contact.setPhoneNumber(phoneNumber);
mDbHelper.getDaoContact().create(contact);
3 Usar DAOs (escribir)

41. Contact contact = new Contact();
contact.setName(name);
PhoneNumber phoneNumber = new PhoneNumber();
phoneNumber.setNumber(number);
contact.setPhoneNumber(phoneNumber);
mDbHelper.getDaoContact().create(contact);
3 Usar DAOs (escribir)

42. Contact contact = new Contact();
contact.setName(name);
PhoneNumber phoneNumber = new PhoneNumber();
phoneNumber.setNumber(number);
contact.setPhoneNumber(phoneNumber);
mDbHelper.getDaoContact().create(contact);
3 Usar DAOs (escribir)
foreignAutoCreate = true

43. ORM Lite

44. ORM Lite
Fácil de usar
Generación automática
Transformación tabla-objeto
Modelos Java
Más allá de Android
No centrado en Android
No reaprovecha componentes

46. Content Provider

47. Content Provider
Tablas y columnas
Almacenamiento independiente
Entre aplicaciones

48. Ejemplo: Contacts Provider

49. Ejemplo: Contacts Provider

51. Ejemplo: Contacts Provider

52. Content Provider

53. Datos entre aplicaciones
Permisos
Integrado en Android
Complejo
Conocimientos avanzados
Sólo una capa
Content Provider

55. ¿Cuál elijo?

56. API Nativa
Modelo impuesto
Control total
Rendimiento
ORM Lite
Objetos Java
Separar capas
Urgente
Content Provider
Información compartida
Extensible
Integrar

57. Otras opciones
ADA Framework
adaframework.com
Android Dataframework
github.com/javipacheco/Android-DataFramework
greenDAO
greendao-orm.com/
Sugar ORM
satyan.github.io/sugar/
Retrofit (REST)
github.com/square/retrofit

58. +Rafa Vázquez
! sloydev.com
" @sloydev