Mysql插入我母语中的chracters问题

Question

我正在尝试将我母语（Sinhala）中的数据插入到我的mysql表中。但MySQL将我的字符显示为问号。

这是我测试它的方式：

CREATE DATABASE sinhala_test;
USE kindheart;

ALTER DATABASE sinhala_test
CHARACTER SET  utf8  
COLLATE utf8_general_ci

CREATE TABLE IF NOT EXISTS `category` (
  `category_id` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,
  `name_si` VARCHAR(100) COLLATE utf8_unicode_ci NOT NULL,
  `description_si` TEXT COLLATE utf8_unicode_ci NOT NULL,
  `last_update` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`category_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

INSERT INTO `category` VALUES (1,'පොත් පත් සහ පාසල් උපකරණ','නවතම පොත් පත් අවශ්‍යතා ඇතුළු සියළුම පාසැල් හා අධ්‍යාපන මෙවලම්.',NOW());

这是我可以从MySQL命令行获得的：

mysql> select * from category\G
*************************** 1. row ***************************
   category_id: 1
       name_si: ???? ??? ?? ????? ?????
description_si: ???? ??????? ????/ ?????? ?? ?? ???? O/L, A/L ??????? ?????, ???????, ??????? ????? ?????? ???? ??? ????????. ????/???????/???????????/??????/?????? ????/ ????/????/?????? ????? ?????? ?????? ?? ???????? ??????.
   last_update: 2018-05-20 11:11:20

有谁能告诉我如何解决这个问题？

NOTE:从phpMyAdmin插入正确的工作时。