Spring Data JDBC - Service 클래스 기능별 코드

목차

1. 이미 존재하는 정보인지 = verifyExistObject // Create 메서드에 활용

2. 이미 등록된 정보인지 = findVerifiedObject // Update, Find, Delete 메서드에 활용

3. 주문된 커피 정보 조회

4. Create 메서드

5. Update 메서드

6. find 메서드 

7. find's 메서드

8. delete 메서드

 

 

1. 이미 존재하는건지 확인 // verifyExistObject // Create 메서드에 활용

VerifyExistCoffee (coffeeCode) 메서드

private void verifyExistCoffee(String coffeeCode) {
        Optional<Coffee> coffee = coffeeRepository.findByCoffeeCode(coffeeCode);
        if(coffee.isPresent())
            throw new BusinessLogicException(ExceptionCode.COFFEE_CODE_EXISTS);
    }

BusinessLogicException 클래스

package com.codestates.exception;

import lombok.Getter;

public class BusinessLogicException extends RuntimeException {
    @Getter
    private ExceptionCode exceptionCode;

    public BusinessLogicException(ExceptionCode exceptionCode) {
        super(exceptionCode.getMessage());
        this.exceptionCode = exceptionCode;
    }
}

ExceptionCode 클래스

package com.codestates.exception;

import lombok.Getter;

// TODO 수정됨
public enum ExceptionCode {
    MEMBER_NOT_FOUND(404, "Member not found"),
    MEMBER_EXISTS(409, "Member exists"),
    COFFEE_NOT_FOUND(404, "Coffee not found"),
    COFFEE_CODE_EXISTS(409, "Coffee Code exists"),
    ORDER_NOT_FOUND(404, "Order not found"),
    CANNOT_CHANGE_ORDER(403, "Order can not change"),
    NOT_IMPLEMENTATION(501, "Not Implementation");

    @Getter
    private int status;

    @Getter
    private String message;

    ExceptionCode(int code, String message) {
        this.status = code;
        this.message = message;
    }
}

2. 이미 등록된 정보인지 확인 // findVerifiedObject // Update, Find, Delete 메서드에 활용

    public Coffee findVerifiedCoffee(long coffeeId) {
        Optional<Coffee> optionalCoffee = coffeeRepository.findById(coffeeId);
        Coffee findCoffee =
                optionalCoffee.orElseThrow(() ->
                        new BusinessLogicException(ExceptionCode.COFFEE_NOT_FOUND));

        return findCoffee;
    }

A. BusinessLogicException 코드

package com.codestates.exception;

import lombok.Getter;

public class BusinessLogicException extends RuntimeException {
    @Getter
    private ExceptionCode exceptionCode;

    public BusinessLogicException(ExceptionCode exceptionCode) {
        super(exceptionCode.getMessage());
        this.exceptionCode = exceptionCode;
    }
}

B. ExceptionCode 클래스

package com.codestates.exception;

import lombok.Getter;

// TODO 수정됨
public enum ExceptionCode {
    MEMBER_NOT_FOUND(404, "Member not found"),
    MEMBER_EXISTS(409, "Member exists"),
    COFFEE_NOT_FOUND(404, "Coffee not found"),
    COFFEE_CODE_EXISTS(409, "Coffee Code exists"),
    ORDER_NOT_FOUND(404, "Order not found"),
    CANNOT_CHANGE_ORDER(403, "Order can not change"),
    NOT_IMPLEMENTATION(501, "Not Implementation");

    @Getter
    private int status;

    @Getter
    private String message;

    ExceptionCode(int code, String message) {
        this.status = code;
        this.message = message;
    }
}

3. 주문된 커피 정보 조회

		// (2) 주문에 해당하는 커피 정보 조회
    public List<Coffee> findOrderedCoffees(Order order) {
        return order.getOrderCoffees()
                .stream()
                .map(coffeeRef -> findCoffee(coffeeRef.getCoffeeId()))
                .collect(Collectors.toList());
    }

4. 데이터 생성 Create // @PostMapping 핸들러메서드

public Coffee createCoffee(Coffee coffee) {
        // (1) 커피 코드를 대문자로 변경
        String coffeeCode = coffee.getCoffeeCode().toUpperCase();

        // 이미 등록된 커피 코드인지 확인
        verifyExistCoffee(coffeeCode);
        coffee.setCoffeeCode(coffeeCode);

        return coffeeRepository.save(coffee);
    }

5. 데이터 수정 Update // @PatchMapping 핸들러메서드

public Coffee updateCoffee(Coffee coffee) {
        // 조회하려는 커피가 검증된 커피인지 확인(존재하는 커피인지 확인 등)
        Coffee findCoffee = findVerifiedCoffee(coffee.getCoffeeId());

        Optional.ofNullable(coffee.getKorName())
                .ifPresent(korName -> findCoffee.setKorName(korName));
        Optional.ofNullable(coffee.getEngName())
                .ifPresent(engName -> findCoffee.setEngName(engName));
        Optional.ofNullable(coffee.getPrice())
                .ifPresent(price -> findCoffee.setPrice(price));

        return coffeeRepository.save(findCoffee);
    }

 6. 특정 데이터 조회 find 메서드 // @GetMapping {"/URI"} 핸들러메서드

    public Coffee findCoffee(long coffeeId) {
        return findVerifiedCoffeeByQuery(coffeeId);
    }

7. 전체 데이터 조회 find's 메서드 // @GetMapping 핸들러메서드

    public List<Coffee> findCoffees() {
        return (List<Coffee>) coffeeRepository.findAll();
    }

8. 데이터 삭제 delete 메서드 // @DeleteMapping 핸들러메서드

    public void deleteCoffee(long coffeeId) {
        Coffee coffee = findVerifiedCoffee(coffeeId);
        coffeeRepository.delete(coffee);
    }