Mysql安装后，我创建一个表并添加一些这样的记录
create table score (
student_id int,
subject varchar(10),
subject_score int
);
insert into score values (001,'数学',50),(002,'数学',60),(003,'数学',70);
结果是
mysql> select * from score;
+------------+---------+---------------+
| student_id | subject | subject_score |
+------------+---------+---------------+
| 1 | ?? | 50 |
| 2 | ?? | 60 |
| 3 | ?? | 70 |
+------------+---------+---------------+
3 rows in set (0.00 sec)
然后我改变了“字符集”
mysql> alter table score character set utf8;
mysql> alter table score modify subject varchar(10) character set utf8;
mysql> set character_set_server=utf8;
mysql> SHOW VARIABLES LIKE 'character_set%';
+--------------------------+---------------------------------------------------------+
| Variable_name | Value |
+--------------------------+---------------------------------------------------------+
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | utf8 |
| character_set_filesystem | binary |
| character_set_results | utf8 |
| character_set_server | utf8 |
| character_set_system | utf8 |
| character_sets_dir | /usr/local/mysql-5.5.47-linux2.6-x86_64/share/charsets/ |
+--------------------------+---------------------------------------------------------+
8 rows in set (0.00 sec)
我的桌子结构是
mysql> show create table score\G;
*************************** 1. row ***************************
Table: score
Create Table: CREATE TABLE `score` (
`student_id` int(11) DEFAULT NULL,
`subject` varchar(10) DEFAULT NULL,
`subject_score` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8
1 row in set (0.00 sec)
我认为一切都很好，但是当我查询我的表格时，汉字仍然无法正确显示
mysql> select * from score;
+------------+---------+---------------+
| student_id | subject | subject_score |
+------------+---------+---------------+
| 1 | ?? | 50 |
| 2 | ?? | 60 |
| 3 | ?? | 70 |
+------------+---------+---------------+
3 rows in set (0.00 sec)
但是当我再次插入相同的记录时，新记录就可以了！
mysql> insert into score values (001,'数学',50),(002,'数学',60),(003,'数学',70);
Query OK, 3 rows affected (0.00 sec)
Records: 3 Duplicates: 0 Warnings: 0
mysql> select * from score;
+------------+---------+---------------+
| student_id | subject | subject_score |
+------------+---------+---------------+
| 1 | ?? | 50 |
| 2 | ?? | 60 |
| 3 | ?? | 70 |
| 1 | 数学 | 50 |
| 2 | 数学 | 60 |
| 3 | 数学 | 70 |
+------------+---------+-------
如何保存我的旧记录？我需要有人帮助，非常感谢