one more thing, how can I connect to local database (postgresql/sqlite/mysql/mariadb) with kotlin native? I know, that I can do it with requery, but then i need to use JVM version. Do I have to use C-lang libraries?

Yes, see for example sqlite access in Kotlinconf Spinner app: https://github.com/JetBrains/kotlinconf-spinner/blob/master/kotlin-native/samples/fullstack/sql/src/main/kotlin/ksqlite/KSqlite.kt