example.kt

@SpringBootApplication
class MedAvailableApplication

fun main(args: Array<String>) {
	val application = runApplication<MedAvailableApplication>(*args).getBean(GuiaContabilRepository::class.java)

	val result = application.save(ImportacaoContrato())
}

///////////////////////////////////////////////////

package com.augustovictor.medavailable

import javax.persistence.*

@Entity
@Table(name = "guia_contabil")
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = "tipo_guia")
abstract class GuiaContabil{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    val id: Long = 0
}

@Entity
@DiscriminatorValue("importacao_contrato")
class ImportacaoContrato : GuiaContabil()

///////////////////////////////////////////////////


package com.augustovictor.medavailable

import org.springframework.data.repository.Repository

interface GuiaContabilRepository : Repository<GuiaContabil, Long> {
    fun save(guiaContabil: GuiaContabil): GuiaContabil
}

///////////////////////////////////////////////////
// V1__.sql
// CREATE TABLE public.guia_contabil(
//     id BIGSERIAL PRIMARY KEY,
//     tipo_guia character(255) NOT NULL
// );

///////////////////////////////////////////////////

//medavailabledb=# select * from guia_contabil;
 //id | tipo_guia
//----+-----------------------
//  1 | ImportacaoContrato
//
//  2 | ImportacaoContrato
//
//  3 | ImportacaoContrato
//
//  4 | ImportacaoContrato
//
//  5 | ImportacaoContratoAlterada
//
//  6 | importacao_contrato
//
//  7 | importacao_contrato