SQLiteReadOnlyDatabaseException: attempt to write a readonly database

Nur meine Daten geaendert, hart-code in die Datenbank mit SQLite Database Browser. Bevor ich änderte alle meine Abfrage funktioniert einwandfrei, aber Fehler tritt auf, wenn ich mich änderte. Kann ich nicht diese Abfrage nicht mehr. Die Datenbank kann nur Lesen aber nicht schreiben. Ich habe versucht, legen Sie einen Eintrag an, wenn der Kunde, um Lebensmittel in die Tabelle "Rechnung" aber nicht. meine Datenbank-Datei im assets/Restaurantdb.sql

Eine weitere seltsame Entdeckung ist, dass ich deinstallieren, die ganze Sache, und ändern Sie einige Lebensmittel, die Namen in meinem "ESSEN"Tabelle (wie Burger Burger1), es zeigen Burger statt Burger1.

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Dies ist meine aktuelle code, aber es endup bekam dieser neue Fehler. Meine Datenbank-Datei im assets Ordner mit dem Namen "Restaurantdb.
Error: No such table Essen beim abrufen von Namen aus der Nahrung.
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 package com.restaurant.sesame;


  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  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.SQLiteException;
  import android.database.sqlite.SQLiteOpenHelper;
  import android.util.Log;
  import android.widget.Toast;

public class Restaurant {
  public static final String KEY_ROWID = "_id";
  public static final String KEY_NAME = "name";
  public static final String KEY_DETAIL = "detail";
  public static final String KEY_PRICE = "price";


private static String DATABASE_NAME ="Restaurantdb";
private static String DATABASE_TABLE ="Food";
private static final int DATABASE_VERSION = 1;
private static String DB_PATH = "/data/data/com.restaurant.sesame/databases/";

private static SQLiteDatabase ourDatabase;
private static Context myContext;
private DBHelper ourHelper;

private static class DBHelper extends SQLiteOpenHelper{

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


    }

    public void createDataBase() throws IOException{

        boolean dbExist = checkDataBase();

        if(dbExist){
            //do nothing - database already exist
        }else{

            //By calling this method and empty database will be created into the default system path
               //of your application so we are gonna be able to overwrite that database with our database.
            this.getReadableDatabase();

            try {

                copyDataBase();

            } catch (IOException e) {

                throw new Error("Error copying database");

            }
        }

    }

    /**
     * Check if the database already exist to avoid re-copying the file each time you open the application.
     * @return true if it exists, false if it doesn't
     */
    private boolean checkDataBase(){

        SQLiteDatabase checkDB = null;

        try{
            String myPath = DB_PATH + DATABASE_NAME;
            checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);

        }catch(SQLiteException e){

            /* database does't exist yet. */

        }

        if(checkDB != null){

            checkDB.close();

        }

        return checkDB != null ? true : false;
    }

    /**
     * Copies your database from your local assets-folder to the just created empty database in the
     * system folder, from where it can be accessed and handled.
     * This is done by transfering bytestream.
     * */
    private void copyDataBase() throws IOException{

        //Open your local db as the input stream
        InputStream myInput = myContext.getAssets().open(DATABASE_NAME);

        // Path to the just created empty db
        String outFileName = DB_PATH + DATABASE_NAME;

        //Open the empty db as the output stream
        OutputStream myOutput = new FileOutputStream(outFileName);

        //transfer bytes from the inputfile to the outputfile
        byte[] buffer = new byte[1024];
        int length;
        while ((length = myInput.read(buffer))>0){
            myOutput.write(buffer, 0, length);
        }

        //Close the streams
        myOutput.flush();
        myOutput.close();
        myInput.close();

    }

    public void openDataBase() throws SQLException{

        //Open the database
        String myPath = DB_PATH + DATABASE_NAME;
        ourDatabase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);

    }

    @Override
    public synchronized void close() {

            if(ourDatabase != null)
                ourDatabase.close();

            super.close();

    }
    @Override
    public void onCreate(SQLiteDatabase db) {

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }



}

public Restaurant(Context c)
{   
    myContext = c;

    DBHelper helper = new DBHelper (myContext);
    this.ourDatabase = helper.getWritableDatabase();
}

public Restaurant open() throws SQLException
{
    ourHelper = new DBHelper (myContext);

     try {

         ourHelper.createDataBase();

    } catch (IOException ioe) {

        throw new Error("Unable to create database");

    }

    try {

        ourHelper.openDataBase();

    }catch(SQLException sqle){

        throw sqle;

    }
    return this;
}

public void close()
{
    ourHelper.close();
}



public String[] getWantedInfos(String KEY_WANTED){
     String[]columns = new String[]{KEY_WANTED};
     Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null);
     String [] wanted = new String[c.getCount()] ;
     int i = 0, 
         iWanted = c.getColumnIndex(KEY_WANTED);

     for(c.moveToFirst();!c.isAfterLast();c.moveToNext())
        {   
            wanted[i] = c.getString(iWanted);
            ++i;
        }
     return wanted;
}

public String getOneInfo(String id, String info)
{
    Log.w("my app", "IN getOneInfo TOP!!!!");
    String [] columns = new String [] {id,info};    

    Cursor c = ourDatabase.query(DATABASE_TABLE, columns, KEY_ROWID + " = "+ id, null, null, null, null);
    Log.w("getOneInfo", "IN getOneInfo after query!!!!");
    String result ="";
    int iRow = c.getColumnIndex(id);
    int iInfo = c.getColumnIndex(info);

    if(c!=null){
        c.moveToFirst();
        result =c.getString(iInfo);
        return result;
    }
    return null;

}

public String getBillInfo(String name, String info)
{
    Log.w("getBillInfo", "IN getBillInfo TOP!!!!");
    String [] columns = new String [] {KEY_NAME,info};  
    Log.w("getBillInfo ","pass in"+ name);
    Log.w("getBillInfo", "pass in"+info);
    Cursor c = ourDatabase.query("Bill", columns, "name = '"+ name+ "'", null, null, null, null);
    Log.w("getBillInfo", "IN getBillInfo after query!!!!");
    String result ="";

    int iInfo = c.getColumnIndex(info);
    Log.w("getBillInfo", "IN getBillInfo before loop!!!!");

    for(c.moveToFirst();!c.isAfterLast();c.moveToNext())
    {   
        Log.w("getBillInfo", "IN getBillInfo inside loop!!!!");
        c.moveToFirst();
        result =c.getString(iInfo);
        Log.w("getBillInfo", "IN getBillInfo XXXXnull!!!!");
        Log.w("getBillInfo", "quantity in bill is ==>"+result);
        return result;
    }
    Log.w("getBillInfo", "IN getBillInfo null!!!!");
    return "0";

}
public String getBillTotal()
{
    Log.w("Bill Total", "YYYY33333");
    Cursor c = ourDatabase.rawQuery(
            "SELECT SUM(total)as total FROM Bill", null);
    Log.w("Bill Total", "YYYY4444");
    String result ="";
    int iInfo = c.getColumnIndex("total");
    Log.w("Bill Total", "YYYY5555");
    if(c!=null){
        c.moveToFirst();
        result =c.getString(iInfo);
        return result;
    }
    return "0.00";

}

public String getBillData()
{
    Log.w("my app", "IN getData TOP!!!!");
    String [] columns = new String [] {"_id","name","price","quantity","total"};    

    Cursor c = ourDatabase.query("Bill", columns, null, null, "name", null, null);
    String result ="";
    int iRow = c.getColumnIndex("_id");
    int iName = c.getColumnIndex("name");
    int iPrice = c.getColumnIndex("price");
    int iQuantity = c.getColumnIndex("quantity");
    int iTotal = c.getColumnIndex("total");
    Log.w("my app", "IN getData MIDDLE!!!!");
    int i = 1;
    for(c.moveToFirst();!c.isAfterLast();c.moveToNext())
    {
        result = result + Integer.toString(i)+"\t" +
                          c.getString(iName) + "\t" +
                          c.getString(iPrice) +"\t" +
                          c.getString(iQuantity) + "\t" +
                          c.getString(iTotal) + "\n";
        i++;
    }
    Log.w("my app", "IN getData END!!!!");
    return result;

}
 public long createOrderEntry(int id, int quantityItem)
 {
     String [] columns = new String [] {KEY_ROWID,KEY_NAME,KEY_PRICE};
     Cursor c = ourDatabase.query(DATABASE_TABLE, columns, KEY_ROWID + "=" + Integer.toString(id) , null, null, null, null);

     if(c!= null)
     {
         ContentValues cv = new ContentValues();
         c.moveToFirst();
         String nameItem = c.getString(1);
         double priceItem = c.getDouble(2);
         double totalItem = priceItem *quantityItem;
         cv.put("name", nameItem);
         cv.put("price", priceItem);
         cv.put("quantity", quantityItem);
         cv.put("total", totalItem);

         return ourDatabase.insert("Bill", null, cv);

     }
     return 0;
 }

 public boolean deleteOrderEntry(int lRow)
 {
     String [] columns = new String [] {KEY_ROWID,KEY_NAME,KEY_PRICE};
     Log.w("my app", "deleteOrderEntry Top");
     Cursor c = ourDatabase.query(DATABASE_TABLE, columns, KEY_ROWID + "= " + Integer.toString(lRow) , null, null, null, null);
     Log.w("my app", "deleteOrderEntry 2");
     if(c!= null)
     {
         c.moveToFirst();
         String nameItem = c.getString(1);
         ourDatabase.delete("Bill", "name = '"+ nameItem+ "'", null);
         Log.w("my app", "deleteOrderEntry MIDDLE");
         return true;
     }
    return false;

 }
 public void truncateBill(){
     ourDatabase.execSQL("DELETE FROM Bill");  
     ourDatabase.execSQL("VACUUM"); 
 }

}

InformationsquelleAutor shoujo_sm | 2012-03-27