MySQL配置的JDBC URL使用utf8字符编码

  • Z时代
  • 2024-01-10
  • 分类：问答

回答：

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)

回答：

现在，对于网络应用程序，我在Tomcat的 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"

上面的方法不起作用，并为我提供了以下应用程序。

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/ |
+--------------------------+----------------------------+

这里可能出什么问题了？为什么它显示utf8mb4代替utf8？

回答：

您可能需要执行以下操作：

MySQL Connector / J

5.1.13中的更改（2010-06-24）

  • Connector / J不支持服务器5.5.2和更高版本的utf8mb4。

现在，Connector /

J会自动检测配置有服务器的服务器，character_set_server=utf8mb4或者将其characterEncoding=...视为utf8mb4在SET

NAMES=建立连接时使用的调用中所传递的Java编码utf-8 。错误＃54175）

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