protected static String getColumnType(Class<?> clazz) {
		String type = null;
		
		if(clazz == Integer.TYPE ) {   //int 
			return "integer";
		}else if(clazz == String.class){   //String
			type = "text";
		}else if(clazz == Long.TYPE){   //long
			type = "integer";
		}else if(clazz == Short.TYPE){   //short
			type = "integer";
		}else if(clazz == Boolean.TYPE){   //boolean
			type = "integer";
		}else if(clazz == Float.TYPE){   //float
			type = "real";
		}else if(clazz == Double.TYPE){   //double
			type = "real";
		}else if(clazz == byte[].class){   //byte
			type = "blob";
		}
		
		return type;
	}