Łączenie dwóch tabel w repozytorium JPA

Więc pytasz natywne zapytania, więc musisz przekazać nativeQuery =true do zapytania argument. Ponadto musisz dodać @Repository adnotacja do TransictionRepository interfejs. To nic innego jak twoja warstwa Dao.

package com.overflow.overflow.service;

import java.util.List;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.stereotype.Repository;

import com.overflow.overflow.models.Transictions;

@Repository
public interface TransictionRepository extends JpaRepository<Transictions, Long> {
    @Query(nativeQuery = true,
            value = "SELECT transiction.user_id, transiction.quantity,transiction.instrument_name, transiction.Price,instrument.LTP"
            + "FROM instrument"
            + "INNER JOIN transiction"
            + "ON instrument.instrument=transiction.instrument_name")
    public List<Object[]> getTransictionsAndInstruments();
}