MySQL database saves Emoji expressions and special symbols

What is utf8mb4：

1. MySQL added this utf8mb4 encoding after version 5.5.3, mb4 is most bytes 4 means, specifically designed to be compatible with four-byte unicode. In fact, utf8mb4 is a superset of utf8

Solution:

1. View the encoded character set:
   • SHOW VARIABLES WHERE Variable_name LIKE 'character \_set\_%' OR Variable_name LIKE 'collation%';
   • If the result is as shown in the figure below, then "the reason why the special symbols cannot be saved may be different from this article, and this article may solve it" I can’t answer your question』;
     
   • If the value field in the result is different from the picture above, please continue reading this article;
2. Modify database encoding:
   • ALTER DATABASE database CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci;;
3. Modify data table encoding:
   • ALTER TABLE table CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;;
4. Modify the table field encoding to:
   • ALTER TABLE table CHANGE column column VARCHAR(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;;
5. Edit the my.ini file and add or modify the following content:

   [client]
   default-character-set = utf8mb4
   [mysql]
   default-character-set = utf8mb4
   [mysqld]
   character-set-client-handshake = FALSE
   character-set-server = utf8mb4
   collation-server = utf8mb4_unicode_ci
   init_connect='SET NAMES utf8mb4'

   Copy after login
6. RestartMysql：
   • service mysqld restart；

7. View the encoded characters again Set, if the results are consistent with the above picture, you are done~

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