MySQL dialect converts all `byte` properties to `boolean`

[hurahurat]

I found that spring-data-r2dbc can read tinyint field as Byte type but I got 0 or 1 for tinyint fields in mysql/maridb database when inserting data.
It seems like byte field is converted to Boolean because of ByteToBooleanConverter in MySqlDialect class.

[mp911de]

ByteToBooleanConverter converts byte to boolean values when reading data from the database.

If you would like us to spend some time helping you to diagnose the problem, please spend some time describing it and, ideally, providing a minimal sample that reproduces the problem.

[hurahurat]

Thank you for your response. Please look at this minimal sample.
demo.zip

These are scripts to create a sample database and table

CREATE DATABASE IF NOT EXISTS `test-db` /*!40100 DEFAULT CHARACTER SET utf8mb4 */;
USE `test-db`;

CREATE TABLE IF NOT EXISTS `user` (
  `user_id` int(11) NOT NULL AUTO_INCREMENT,
  `state` tinyint(1) NOT NULL DEFAULT 0,
  PRIMARY KEY (`user_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

When hitting "/user/add" I got the response with a state value is 3 but the actual value saved in the database is 1.

[mp911de]

Thanks for the report and the example. The ByteToBooleanConverter in MySQL dialect, which is also used for MariaDB, converts all byte properties to boolean. The converter should actually be used only for reading.