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This article is about how to deal with defects in the utf8 character set in Mysql. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Mysql utf8 character set defect handling (emoji symbol problem, Wechat, Alipay, QQ nickname) 1. Datasheet change

Because the non-standard utf8 character set (utf8mb3) is used in Mysql, you need to modify the character set type manually, as follows

ALTER TABLE `user`CHANGE COLUMN `username``username` VARCHAR (50) CHARSET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT 'user name' AFTER `password`; 2. JDBC connection settings

Referring to connector-j-reference-charset, you can see that if a program wants to insert utf8mb4 characters, the following conditions need to be met:

Connector/J version 5.1.47 and above: 1. Specify the characterEncoding parameter as UTF8/UTF-8, and the new version is directly mapped to utf8mb4 encoding; 2. If the collation specified by connectionCollation is not utf8mb4-related, the characterEncoding parameter will be rewritten to the encoding corresponding to the collation; Connector/J version 5. 1. 47 and below: 1. Set the MySQL parameter variable character_set_server=utf8mb4; 2. Specify the characterEncoding parameter as UTF8/UTF-8, and the jdbc program will probe whether to use utf8mb4.

You can solve the problem by upgrading the program to Connector/J 5.1.47.

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