Using Cursor Loader in Android

package tpg.database;

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

public class DatabaseHandler extends SQLiteOpenHelper implements Runnable
{
	
	protected SQLiteDatabase mbDataBase;
	protected final Context mbContext;
    protected String db_name;
    protected SQLiteStatement insertStmt;
    protected static String DB_PATH = "/data/data/linkwithweb/databases/";
    protected static final String table_name="SampleCursorLoaderData";
    private static String TAG="DatabaseHandler";
    
    public static class UserTable {  
		   public static String id="_id";
		   public static String name="name";
	} 
	protected DatabaseHandler(Context context, String name, CursorFactory factory,int version){
		super(context, name, factory, version);
		this.mbContext = context;
		this.db_name = name;
		
		Thread t=new Thread(this);
		t.start();
		
		try{
			if(t.isAlive()){
				t.join();
			}
		}catch(Exception e){
			e.printStackTrace();
		}
	}
	
	public void onCreate(SQLiteDatabase db){
		Log.v(TAG,"OnCreate method SQliteHelper");
		String str="create table "+table_name+" ( "+UserTable.id+" TEXT, "+ UserTable.name+" TEXT);";
		db.execSQL(str);
	}
	
	public void run(){
		mbDataBase = getWritableDatabase();
		Log.v(TAG,"Database object is created ="+mbDataBase);
	}

	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){
		mbDataBase.execSQL("DROP TABLE IF EXISTS " + table_name);
		onCreate(mbDataBase);
	}
//	public synchronized void close() 
//	{
//		if (mbDataBase != null)
//		{
//			mbDataBase.close();
//		}
//		super.close();
//	}
	
	protected SQLiteDatabase getDb() 
	{
		return mbDataBase;
	}

	protected void insert() 
	{
		Log.v(TAG,"Inserting data in db");
		ContentValues cv=new ContentValues();
		cv.put(UserTable.id, 1);
		cv.put(UserTable.name, "Inserting Row 1");
		mbDataBase.insert(table_name,null, cv);
		
		cv=null;
		cv=new ContentValues();
		cv.put(UserTable.id, 2);
		cv.put(UserTable.name, "Inserting Row 2");
		mbDataBase.insert(table_name,null, cv);
		
		cv=new ContentValues();
		cv.put(UserTable.id, 3);
		cv.put(UserTable.name, "Inserting Row 3");
		mbDataBase.insert(table_name,null, cv);
		
		cv=new ContentValues();
		cv.put(UserTable.id, 4);
		cv.put(UserTable.name, "Inserting Row 4");
		mbDataBase.insert(table_name,null, cv);
	}
	public Cursor queryData(){
		
	    Cursor cursor = this.mbDataBase.query(table_name, null,null, null, null, null, null);
	    /*if (cursor != null && !cursor.isClosed()) {
	         cursor.close();
	    }*/
	    return cursor;
	}
}