用于MySQL配置的JDBC url使用utf8字符编码

Question

MySQL 5.6配置

我已/etc/mysql/my.cnf手动配置使用utf8.见下文:

[mysqld]
character-set-server=utf8
character-sets-dir=/usr/share/mysql/charsets

[mysql]
character-sets-dir=/usr/share/mysql/charsets default-character-set=utf8

[mysqladmin]
character-sets-dir=/usr/share/mysql/charsets default-character-set=utf8

[mysqlcheck]
character-sets-dir=/usr/share/mysql/charsets default-character-set=utf8

[mysqldump]
character-sets-dir=/usr/share/mysql/charsets default-character-set=utf8

[mysqlimport]
character-sets-dir=/usr/share/mysql/charsets default-character-set=utf8

[mysqlshow]
character-sets-dir=/usr/share/mysql/charsets default-character-set=utf8

[client]
character-sets-dir=/usr/share/mysql/charsets default-character-set=utf8

从控制台:

mysql> show variables like 'char%';
+--------------------------+----------------------------+
| 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/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.01 sec)

应用配置

现在对于web-app我在Tomcat中使用了这个连接url context.xml

url="jdbc:mysql://localhost:3306/test?autoReconnect=true&useUnicode=true&characterEncoding=UTF-8"

url="jdbc:mysql://localhost:3306/test?autoReconnect=true&useUnicode=true&characterEncoding=UTF-8&characterSetResults=utf8&connectionCollation=utf8_general_ci"

以上不起作用,并让我跟随申请.

show variables like 'char%';
+--------------------------+----------------------------+
| Variable_name            | Value                      |
+--------------------------+----------------------------+
| character_set_client     | utf8mb4                    |
| character_set_connection | utf8                       |
| character_set_database   | utf8                       |
| character_set_filesystem | binary                     |
| character_set_results    | utf8mb4                    |
| character_set_server     | utf8                       |
| character_set_system     | utf8                       |
| character_sets_dir       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+

---

这可能有什么问题？为什么它显示utf8mb4代替utf8？

Answer 1

您可能需要执行以下操作:

MySQL Connector/J的变化5.1.13(2010-06-24)

• Connector/J不支持服务器5.5.2及更高版本的utf8mb4.

  Connector/J现在自动检测使用character_set_server = utf8mb4配置的服务器,或者在SET NAMES =在建立连接时进行的调用中使用characterEncoding = ...作为utf8mb4处理传递的Java编码utf-8.(缺陷#54175)