Lecture 10: Android SQLite database.pptx

Mobile Application
Development
Lecture 10
Database
Android SQLite Database
T. Yousef Alamir

SQLite is an open-source SQL database that stores data in a text file on a
device. Android comes in with built-in SQLite database implementation.
SQLite supports all the relational database features. In order to access
this database, you don’t need to establish any kind of connections for it
like JDBC, ODBC …etc.
Android - SQLite Database

Database – Package:
The main package is android.database.sqlite which contains the
classes to manage your own databases
Database – Creation:
In order to create a database you just need to call this method
openOrCreateDatabase with your database name and mode as a
parameter. It returns an instance of SQLite database which you
have to receive in your own object.Its syntax is given below
SQLite Database creation
SQLiteDatabase db = openOrCreateDatabase("database
name“ ,MODE_PRIVATE, null);

SQLiteDatabase Methods
Method name Description
1 openDatabase(String path,
SQLiteDatabase.CursorFactory
factory, int flags,
DatabaseErrorHandler
errorHandler)
This method only opens the existing database
with the appropriate flag mode. The common
flags mode could be OPEN_READWRITE
OPEN_READONLY
2 openDatabase(String path,
factory, int flags)
It is similar to the above method as it also
opens the existing database but it does not
define any handler to handle the errors of
databases.
3 openOrCreateDatabase(String
path,
factory)
It not only opens but creates the database if it
does not exist. This method is equivalent to the
openDatabase method.
4 openOrCreateDatabase(File file,
This method is similar to the above method but
it takes the File object as a path rather than a

we can create a table or insert data into a table using execSQL method defined in
SQLiteDatabase class. Its syntax is given below:
Create users table:
db.execSQL(“
CREATE TABLE IF NOT EXISTS users(
Username VARCHAR,
Password VARCHAR
);“
);
Insert into users table:
db.execSQL("INSERT INTO users VALUES('admin','admin');");
This will insert some values into our table in our database. Another method that
also does the same job but take some additional parameter is given below
execSQL(String sql, Object[] bindArgs)
This method not only inserts data but is also used to update or modify already
existing data in the database using bind arguments
Database - Insertion

We can retrieve anything from the database using an object of the Cursor class. We will call a
method of this class called rawQuery and it will return a resultset with the cursor pointing to the
table. We can move the cursor forward and retrieve the data.
Retrieve data from users table:
Cursor resultSet = db.rawQuery("Select * from users",null);
resultSet.moveToFirst();
String username = resultSet.getString(0);
String password = resultSet.getString(1);
There are other functions available in the Cursor class that allows us to effectively retrieve the data.
That includes:
The the
Database - Fetching
Metod Description
1 getColumnCount() return the total number of columns of the table.
2 getColumnIndex(String
columnName)
returns the index number of a column by specifying the
name of the column
3 getColumnName(int
columnIndex)
returns the name of the column by specifying the index of
the column
4 getColumnNames() returns the array of all the column names of the table
5 getCount() returns the total number of rows in the cursor
6 getPosition() returns the current position of the cursor in the table

For managing all the operations related to the database, a helper
class has been given and is called SQLiteOpenHelper. It
automatically manages the creation and update of the database.
Its syntax is given below:
public class DBHelper extends SQLiteOpenHelper {
public DBHelper(){
super(context,DATABASE_NAME,null,1);
}
public void onCreate(SQLiteDatabase db) {}
public void onUpgrade(SQLiteDatabase database, int
oldVersion, int newVersion) {}
}
Database - Helper class

Thank You
T. Yousef Alamir 2023
http://Yousef.omairtech.com

Lecture 10: Android SQLite database.pptx

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