mysql> use  demodb;
Reading table information for completion of table and column names
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Database changed
mysql>

mysql> show variables like 'character\_set\_%';
+--------------------------+--------+
| Variable_name            | Value  |
+--------------------------+--------+
| character_set_client     | latin1 |
| character_set_connection | latin1 |
| character_set_database   | latin1 |
| character_set_filesystem | binary |
| character_set_results    | latin1 |
| character_set_server     | latin1 |
| character_set_system     | utf8   |
+--------------------------+--------+
7 rows in set (0.00 sec)

mysql> set character_set_client=utf8;
Query OK, 0 rows affected (0.01 sec)

mysql> show variables like 'character\_set\_%';
+--------------------------+--------+
| Variable_name            | Value  |
+--------------------------+--------+
| character_set_client     | utf8   |
| character_set_connection | latin1 |
| character_set_database   | latin1 |
| character_set_filesystem | binary |
| character_set_results    | latin1 |
| character_set_server     | latin1 |
| character_set_system     | utf8   |
+--------------------------+--------+
7 rows in set (0.00 sec)

mysql> select * from project;
+-------+------------+------+--------------+-------------+-----------+----------+--------------+--------+
| ID    | pname      | URL  | LEAD         | DESCRIPTION | pkey      | pcounter | ASSIGNEETYPE | AVATAR |
+-------+------------+------+--------------+-------------+-----------+----------+--------------+--------+
| 10200 | demo       | NULL | aaa      | NULL        | DEMO      |      159 |            2 |  10011 |
| 10300 | demo2      | NULL | bbb | NULL        | DEMOTWO   |        1 |            2 |  10011 |
| 10302 | ??????     |      | ccc      |             | FFF        |        0 |            2 |  10011 |
| 10500 | ????       | NULL | aaa      | NULL        | QQQ       |       11 |            2 |  10011 |
| 10501 | SCRUM-???? | NULL | ddd      | NULL        | SFFF       |       24 |            2 |  10011 |
| 10502 | ??????     | NULL | eee      | NULL        | SSS       |        6 |            2 |  10011 |
| 10504 | ????       | NULL | fff      | NULL        | FINANCING |        2 |            2 |  10011 |
+-------+------------+------+--------------+-------------+-----------+----------+--------------+--------+
7 rows in set (0.00 sec)

mysql>



mysql> set character_set_connection=utf8;
Query OK, 0 rows affected (0.00 sec)

mysql> set character_set_database=utf8;
Query OK, 0 rows affected (0.00 sec)

mysql> set character_set_results=utf8;
Query OK, 0 rows affected (0.00 sec)

mysql> set character_set_server=utf8;
Query OK, 0 rows affected (0.00 sec)

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   |
+--------------------------+--------+
7 rows in set (0.00 sec)

mysql> select * from project;
+-------+--------------------+------+--------------+-------------+-----------+----------+--------------+--------+
| ID    | pname              | URL  | LEAD         | DESCRIPTION | pkey      | pcounter | ASSIGNEETYPE | AVATAR |
+-------+--------------------+------+--------------+-------------+-----------+----------+--------------+--------+
| 10200 | demo               | NULL | aaa      | NULL        | DEMO      |      159 |            2 |  10011 |
| 10300 | demo2              | NULL | bbb | NULL        | DEMOTWO   |        1 |            2 |  10011 |
| 10302 | 實例項目需求 |      | ccc      |             | FFF        |        0 |            2 |  10011 |
| 10500 | 演示項目       | NULL | ddd      | NULL        | QQQ       |       11 |            2 |  10011 |
| 10501 | SCRUM-實例項目 | NULL | eee      | NULL        | SFFF       |       24 |            2 |  10011 |
| 10502 | 正式A需求 | NULL | fff      | NULL        | SSS       |        6 |            2 |  10011 |
| 10504 | 正式T       | NULL | ddd      | NULL        | FINANCING |        2 |            2 |  10011 |
+-------+--------------------+------+--------------+-------------+-----------+----------+--------------+--------+
7 rows in set (0.00 sec)


通過以上過程說明.僅僅通過set character_set_client=utf8;是不能解決亂碼問題的.解決亂碼問題需要把mysql的服務器編碼設置成utf8,同時,創建數據庫的時候需要把數據庫的編碼設置成utf8編碼,才能解決mysql數據庫查詢亂碼問題.

如果數據庫服務器的編碼是utf8,而數據庫的編碼也是utf8,在客戶端查詢出現亂碼,基本上可以推斷是客戶端的設置不是utf8編碼.

數據庫服務編碼設置請參見mysql服務端編碼設置.