Mysql dialect does not support expressions as default values

[jetbrains]

Mysql dialect does not support expressions as default values

[Tapac]

The DEFAULT value clause in a data type specification indicates a default value for a column. With one exception, the default value must be a constant; it cannot be a function or an expression. This means, for example, that you cannot set the default for a date column to be the value of a function such as NOW() or CURRENT_DATE. The exception is that you can specify CURRENT_TIMESTAMP as the default for TIMESTAMP and DATETIME columns.
http://dev.mysql.com/doc/refman/5.7/en/data-type-defaults.html

So I guess Mysql doesn't truly support an expressions as columns default, especially comparing to PostgreSQL (https://www.postgresql.org/docs/9.3/static/ddl-default.html)

[crazyproger]

Ouch, thank you for clarification, @Tapac. I will create custom ColumnType for this purpose in my case.

[Tapac]

You can use clientDefault{} to generate value on client side:

object : Table("") {
   val colWithDefault = integer("intCol").clientDefault { Random.nextInt() }
}

[crazyproger]

Thank you for suggestion, but I think some fields(created, modified in my case) better generate on database, for example with my table works not only kotlin code but also web-app(ruby/php/etc). And to not forget to generate it in all places better to generate it in one-DB.

[Tapac]

Then triggers might suite your need, I guess.