Out-of-the-box jasync supported those types of encoding:

• UTF_8
• US_ASCII
• ISO_8859_1

The default one is UTF_8.

In version 0.9.50 the encoding used for UTF-8 was changed from utf8mb3 to utf8mb4_unicode_ci. Effectively, it allows passing UTF chars of up to 4 bytes, Including emoji's.

In case you would like to use other charsets there are 2 options:

• Configure Charset and CharsetMapping via configuration and connection construction. This methods is a bit tricky but supported. You can see here the usage: https://github.com/jasync-sql/jasync-sql/blob/master/mysql-async/src/main/java/com/github/jasync/sql/db/mysql/util/CharsetMapper.kt
• Add a JVM property: -DjasyncMysqlUTF8Collation=83 (or replace 83 with the one you want to use). This will change the default encoding itself.

For more details you can see the PR: https://github.com/jasync-sql/jasync-sql/pull/115

List of unicode charsets can be seen here: https://dev.mysql.com/doc/refman/8.0/en/charset-mysql.html