Just changed my data that are hard-code into database to using SQLite Database Browser. Before I changed all my query works fine but errors occurs when I changed. I can't do those query anymore. The database can only read but not write. I was trying to insert an entry when customer order food into table "Bill" but failed. my database file is at assets/Restaurantdb.sql
One more strange discovery is that I uninstall the whole thing and change some food name in my "FOOD"table (like Burger to Burger1), it show Burger instead of Burger1.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ This is my lastest code but it endup got this new error. My database file in assets folder named "Restaurantdb. Error: No such table Food when retrieve name from food. +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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");
}
}
You need to make a writable database if you want to insert values in database need to add these lines in constructor
DBHelper helper = new DBHelper (mCtx);
this.db = helper.getWritableDatabase();
public Restaurant(Context c)
{
myContext = c;
DBHelper helper = new DBHelper (mCtx);
this.db = helper.getWritableDatabase();
}
Kuffs
You cannot write to a database that is stored in your assets folder as that is part of your apk and cannot be changed.
When your app runs you should check for the existence of a database (in the normal databases folder) and if it does not exist, copy the database from your assets folder and use that instead.
See these links for more info.
Letter tran
public void openDataBase() throws SQLException{
//Open the database
String myPath = DB_PATH + DATABASE_NAME;
ourDatabase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}
You must change SQLiteDatabase.OPEN_READONLY to SQLiteDatabase.OPEN_READWRITE, because OPEN_READONLY only allows to read not write.
来源：https://stackoverflow.com/questions/9884969/sqlitereadonlydatabaseexception-attempt-to-write-a-readonly-database