@Override

    public void onUpgrade(SQLiteDatabase db, int arg1, int arg2) {

        // TODO Auto-generated method stub

        try {

            InputStream in = mContext.getAssets().open("patch.sql");

            BufferedReader bufferedReader = new BufferedReader(

                    new InputStreamReader(in));

            String sqlUpdate = null;

            while ((sqlUpdate = bufferedReader.readLine()) != null) {

                if (!TextUtils.isEmpty(sqlUpdate)) {

                    db.execSQL(sqlUpdate);

                }

            }

            bufferedReader.close();

            in.close();

        } catch (SQLException e) {

            System.out.println(e.toString());

        } catch (IOException e) {

            System.out.println(e.toString());

        }

    }

        dbfile="/data/data/app package name/databases/dbname.db";

    try {

            if (!(new File(dbfile).exists())) {

                //判断数据库文件是否存在，若不存在则执行导入，否则直接打开数据库

                InputStream is = this.context.getResources().openRawResource(

                        R.raw.sy8database); //欲导入的数据库

                FileOutputStream fos = new FileOutputStream(dbfile);

                byte[] buffer = new byte[BUFFER_SIZE];

                int count = 0;

                while ((count = is.read(buffer)) > 0) {

                    fos.write(buffer, 0, count);

                }

                fos.close();

                is.close();

            }

            SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(dbfile, null);