[EDIT] 該当テーブルの収支の情報を取得するメソッドを追加しました。

src/main/java/com/example/demo/app/domain/service/TransactionService.java

@@ -10,6 +10,8 @@ import com.example.demo.app.presentation.form.Income;
 
 public interface TransactionService {
 
+	public TransactionModel findByTransactionId(Long transactionId);
+	
 	public Map<LocalDate, List<TransactionModel>> findAllByDate(LocalDate startDate, LocalDate endDate, Long userId);
 	
 	public List<TransactionModel> findByUserIdAndDate(LocalDate todayDate, Long userId);
@@ -18,6 +20,8 @@ public interface TransactionService {
 	
 	public int findTotalExpense(LocalDate startDate, LocalDate endDate, Long userId);
 	
+	public int findMoneyRecord(Long transactionId);
+	
 	public int createTransaction(TransactionModel transactionModel);
 	
 	public int updateTransaction(TransactionModel transactionModel);

src/main/java/com/example/demo/app/domain/service/impl/TransactionServiceImpl.java

@@ -29,6 +29,13 @@ public class TransactionServiceImpl implements TransactionService {
 	private final UserRepository userRepository;
 	private final CategoryRepository categoryRepository;
 
+	
+	public TransactionModel findByTransactionId(Long transactionId) {
+		
+		return TransactionModel.convertFrom(transactionRepository.findById(transactionId).get());
+		
+	}
+	
 	public Map<LocalDate, List<TransactionModel>> findAllByDate(
 			LocalDate startDate,
 			LocalDate endDate,
@@ -93,6 +100,11 @@ public class TransactionServiceImpl implements TransactionService {
 
 	}
 	
+	public int findMoneyRecord(Long transactionId) {
+		return transactionRepository.findMoneyRecord(transactionId);
+	}
+	
+
 	public int createTransaction(TransactionModel transactionModel) {
 
 		Optional<UserEntity> userEntityOptional = userRepository.findById(transactionModel.getUserId());

src/main/java/com/example/demo/app/infra/repository/TransactionRepository.java

@@ -33,5 +33,7 @@ public interface TransactionRepository extends JpaRepository<TransactionEntity,
 	@Query("select new com.example.demo.app.presentation.form.Income(t.transactionDate, coalesce(sum(t.amount), 0)) from TransactionEntity t inner join CategoryEntity c on t.categoryEntity.categoryId = c.categoryId where (t.userEntity.userId = :userId and t.transactionDate between :startDate and :endDate) and c.transactionType = 1 group by t.transactionDate order by t.transactionDate asc")
 	public List<Income> findTotalIncomeList(LocalDate startDate, LocalDate endDate, Long userId);
 	
+	@Query("select coalesce(t.amount, 0) from TransactionEntity t where t.transactionId = :transactionId")
+	public Integer findMoneyRecord(Long transactionId);
 	
 }