将SQLite数据库转换为CSV，然后转换为Excel，而不使用`dbhelper`类

我曾经使用这个代码进行转换。 当我创buildgetReadableDatabase函数时，我无法返回SQLiteDatabaseobject.getReadableDatabase() ：

 private void exportDBtoCSV() { File dbFile=getDatabasePath("/Database/"+SAMPLE_TABLE_NAME); //DBHelper dbhelper = new DBHelper(getApplicationContext()); File exportDir = new File(Environment.getExternalStorageDirectory(), ""); if (!exportDir.exists()) { exportDir.mkdirs(); } File file = new File(exportDir, "csvname.csv"); try { file.createNewFile(); CSVWriter csvWrite = new CSVWriter(new FileWriter(file)); sqldb = this.getReadableDatabase(); Cursor curCSV = sqldb.rawQuery("SELECT * FROM contacts",null); csvWrite.writeNext(curCSV.getColumnNames()); while(curCSV.moveToNext()) { //Which column you want to exprort String arrStr[] ={curCSV.getString(0),curCSV.getString(1), curCSV.getString(2)}; csvWrite.writeNext(arrStr); } csvWrite.close(); curCSV.close(); } catch(Exception sqlEx) { Log.e("MainActivity", sqlEx.getMessage(), sqlEx); } } public SQLiteDatabase getReadableDatabase() { // TODO Auto-generated method stub return sqldb.getReadableDatabase(); }}