Register custom decoder? about crystal-mysql HOT 2 CLOSED

No there is not.

The best I can say today is to check https://github.com/crystal-lang/crystal-mysql/blob/master/src/mysql/types.cr . The decl_type macro declares a struct that write/read (binary protocol)/parse (text protocol) values from the connection.

MySql::Type are grabbed by the column type id and those are stored in a class variable hash. That is filled by the decl_type directly. Later included types should override previous ones since code should be run in order.

from crystal-mysql.

Here is an example to transparently encode/decode the UUID type to MySQL:
https://github.com/ysbaddaden/rome/blob/master/src/mysql_ext.cr

from crystal-mysql.