android database file not loading on real device, Basic Computer Science

Assignment Help:
i have an android app which uses a database file called question db which is stored in the assets file. I have tried a database example called android application development but for some reason it doesnt seem to work on the real device

Here is the database code

package net.learn2develop.Databases;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

public class DBAdapter {
public static final String KEY_ROWID = "_id";
public static final String KEY_NAME = "name";
public static final String KEY_EMAIL = "email";
private static final String TAG = "DBAdapter";

private static final String DATABASE_NAME = "MyDB";
private static final String DATABASE_TABLE = "contacts";
private static final int DATABASE_VERSION = 2;

private static final String DATABASE_CREATE =
"create table contacts (_id integer primary key autoincrement, "
+ "name text not null, email text not null);";

private final Context context;

private DatabaseHelper DBHelper;
private SQLiteDatabase db;

public DBAdapter(Context ctx)
{
this.context = ctx;
DBHelper = new DatabaseHelper(context);
}

private static class DatabaseHelper extends SQLiteOpenHelper
{
DatabaseHelper(Context context)
{
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}

@Override
public void onCreate(SQLiteDatabase db)
{
try {
db.execSQL(DATABASE_CREATE);
} catch (SQLException e) {
e.printStackTrace();
}
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS contacts");
onCreate(db);
}
}

//---opens the database---
public DBAdapter open() throws SQLException
{
db = DBHelper.getWritableDatabase();
return this;
}

//---closes the database---
public void close()
{
DBHelper.close();
}

//---insert a contact into the database---
public long insertContact(String name, String email)
{
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_NAME, name);
initialValues.put(KEY_EMAIL, email);
return db.insert(DATABASE_TABLE, null, initialValues);
}

//---deletes a particular contact---
public boolean deleteContact(long rowId)
{
return db.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0;
}

//---retrieves all the contacts---
public Cursor getAllContacts()
{
return db.query(DATABASE_TABLE, new String[] {KEY_ROWID, KEY_NAME,
KEY_EMAIL}, null, null, null, null, null);
}

//---retrieves a particular contact---
public Cursor getContact(long rowId) throws SQLException
{
Cursor mCursor =
db.query(true, DATABASE_TABLE, new String[] {KEY_ROWID,
KEY_NAME, KEY_EMAIL}, KEY_ROWID + "=" + rowId, null,
null, null, null, null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}

//---updates a contact---
public boolean updateContact(long rowId, String name, String email)
{
ContentValues args = new ContentValues();
args.put(KEY_NAME, name);
args.put(KEY_EMAIL, email);
return db.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) > 0;
}
}

I am wondering if its a problem with my phone


Related Discussions:- android database file not loading on real device

Pseudocode, How Much Insurance? Many financial experts advise that property...

How Much Insurance? Many financial experts advise that property owners should insure their homes or buildings for at least 80 percent of the amount it would cost to replace the st

Dataflow modeling for dsp design, Dataflow Modeling for DSP Design The ...

Dataflow Modeling for DSP Design The necessary components in the research of application-specific computer architectures are: 1) a clearly identified set of problems that can b

How to crack a password, how can i crack the password of vmware virtual mac...

how can i crack the password of vmware virtual machine

Fhtjhnkjfdum, ryby db fgrh herbgh buyh hehg gvo hb bbithbs bgshbshdgbh bu...

ryby db fgrh herbgh buyh hehg gvo hb bbithbs bgshbshdgbh bubfvhb bs v h hjjg jdk jnmnv j

Analyze the complexity of dijkstra''s algorithm, QUESTION (a) Given the...

QUESTION (a) Given the graph as shown in figure, apply Lagrangian technique to complete the table assuming μ=1 and T=14                        Path P

Networking and telecommunications, NETWORKING AND TELECOMMUNICATIONS: ...

NETWORKING AND TELECOMMUNICATIONS: Computers can now communicate with each other and with a range of peripheral devices, over distances with increasing speed and reliability.

CS310, Ask question #Minimashdhdghfdgdfgdsgfdsgdsgdgdfgdgfdgdfgdfgdfsgfdsgd...

Ask question #Minimashdhdghfdgdfgdsgfdsgdsgdgdfgdgfdgdfgdfgdfsgfdsgdfsgum 100 words accepted#

Theory of computation, If L is a regular language show that L U {a} is regu...

If L is a regular language show that L U {a} is regular

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd