Question

i am try to insert user and pass to login table it shows an error, i am passing username,password as construtor to database class. now i want to insert username and password to login page

             public class Database extends SQLiteOpenHelper{

private static final String DATABASE_NAME = "sample";
private static final int DATABASE_VERSION = 1;
private static final String INSPECTION_CREATE = "CREATE TABLE IF NOT EXISTS login ("
                        + "username TEXT," + "password TEXT);";



public Database(Context context) {
    super(context, DATABASE_NAME, null, DATABASE_VERSION);

    // TODO Auto-generated constructor stub
}

@Override
public void onCreate(SQLiteDatabase db) {
    // TODO Auto-generated method stub

}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    // TODO Auto-generated method stub
    db.execSQL("DROP TABLE IF EXISTS login");

}
 public void insert_datas(String user,String pass,String table_name){
        SQLiteDatabase db=this.getWritableDatabase();//in this line error comes

         ContentValues initialValues = new ContentValues();

            initialValues.put("user",user);
            initialValues.put("pass",pass);
            long n = db.insert(table_name,user,initialValues);

            System.out.println("n"+n);
            db.close();
    }

}

Answer 1

You haven’t created your database… the onCreate method is empty, nor do I see you use your table creation string anywhere else.

@Override
public void onCreate(SQLiteDatabase db) {
    db.execSQL(INSPECTION_CREATE);
}

Your onUpgrade needs a little help too (it’ll delete the table but not re-create it):

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    // TODO Auto-generated method stub
    db.execSQL("DROP TABLE IF EXISTS login");
    onCreate(db);
}

Hope this helps!