Connect Arduino and phpMyadmin

while (oldTemp0==tempC0)
  { 
  Serial.println("ddddddd");
  float tempC0 = sensors.getTempC(insideThermometer);
  Serial.println(tempC0);
  delay(2000);
/*  if (tempC0 != oldTemp0)
  break;*/
  }
  oldTemp0 = tempC0;
  Serial.println(oldTemp0);
}

Why inside the while loop this code float tempC0 = sensors.getTempC(insideThermometer); doesn't work?