feat: implement pembatasan jumlah buku yang dipinjam

src/loan/Loan.py

@@ -44,6 +44,12 @@ class LoanController:
 
     def addLoan(self, peminjaman):
         cursor = self.connection.cursor()
+        cursor.execute('''
+            SELECT * FROM Loan Where MemberID=?''', (peminjaman.getMemberID(),))
+        loan = cursor.fetchall()
+        if (len(loan) >=3):
+            print("Member tidak bisa meminjam lebih dari tiga buku")
+            return
         cursor.execute('''
             INSERT INTO Loan (ID, BookISBN, MemberID, BorrowDate, ReturnDate)
             VALUES (?, ?, ?, ?, ?)
@@ -56,6 +62,12 @@ class LoanController:
 
     def addLoanByFields(self, book, member, borrowDate, returnDate):
         cursor = self.connection.cursor()
+        cursor.execute('''
+            SELECT * FROM Loan Where MemberID=?''', (member,))
+        loan = cursor.fetchall()
+        if (len(loan) >=3):
+            print("Member tidak bisa meminjam lebih dari tiga buku")
+            return
         cursor.execute('''
             INSERT INTO Loan (BookISBN, MemberID, BorrowDate, ReturnDate)
             VALUES (?, ?, ?, ?)