Friday, July 12, 2013

SQLIteDatabase in Android


In this tutorial I will describe about using/creating database in Android.

See the post    Using,Creating,Updating DataBase In Android   for Running Example of Using SQLiteDatabase in Android. The example describes how to create table, Insert rows in Table, delete rows from table, Updating Table etc with Example.

•  is an Open Source Database which is embedded into Android.
•  supports standard relational database features like SQL syntax.
•  requires only little memory at runtime .
•   supports all data types like int, string, long etc

Using SQLite database

•  does not require any database setup or administration.
•  need define the SQL statements for creating and updating the database. Afterwards the database is automatically managed for you by the Android platform.
• database is by default saved in the directory DATA/data/APP_NAME

Creating DataBase

• Use SQLiteOpenHelper
• need to override the onCreate() and onUpgrade() methods.
• onCreate() is called by the Android framework, to create the database if the database does not exists.
• onUpgrade() is called, if the database version is increased in your application code.
• provides the methods getReadableDatabase() and getWriteableDatabase()

Sample Code
public class DataBaseHelper extends SQLiteOpenHelper
          String DATABASE_CREATE = "create table "+"LOGIN"+  "( " +"ID"+" integer primary key              autoincrement,"+ "USERNAME text,PASSWORD text); ";
         public void        onCreate(SQLiteDatabase db)  
        public void onUpgrade(SQLiteDatabase db, int _oldVersion, int _newVersion)
                   db.execSQL("DROP TABLE IF EXISTS " + "TEMPLATE"); 
                   onCreate( db); 

Accessing DataBase/Table

•By rawQueay() method call
       Ex:  Cursor cursor = getReadableDatabase(). rawQuery("select * from tablename where _id = ?", new String[] { id });
•By query() mrthod call 
       Ex:  return database.query(DATABASE_TABLE, new String[] { “Column1”,”Column2”}, null, null, null, null, null);

Parameters of query() method

  1. String TableName: The name of Table
  2. String[] columnNames: A list of which table columns to return. Passing "null" will return all columns.
  3. String whereClause: Where-clause, i.e. filter for the selection of data, null will select all data.
  4. String[] selectionArgs: You may include ?s in the "whereClause"". These placeholders will get replaced by the values from the selectionArgs array.
  5. String[] groupBy: how to group rows, null will cause the rows to not be grouped.
  6. String[] having: Filter for the groups, null means no filter.
  7. String[] orderBy: Table columns which will be used to order the data, null means no ordering. Cursor


•  A query returns a Cursor object.
•  A Cursor represents the result of a query and basically points to one row of the query result.
getCount() : returns  Number of rows
•  moveToFirst() : moves the cursor  to first row of returned result
•  moveToNext() : moves the cursor  to next row of returned result
•  moveToPosition(int position) : moves the cursor  to particular row of returned result

See the post    Using,Creating,Updating DataBase In Android   for Running Example of Using SQLiteDatabase in Android. The example describes how to create table, Insert rows in Table, delete rows from table, Updating Table etc with Example.

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