书店管理。
我正在创建一个管理书店的程序。 我想在其中添加一个删除选项。 我可以在我的程序中创建多个书店，并在书店中添加多本书。 我想要删除选项，以便能够使用程序纠正最终的人为错误。 让我向您展示我的代码
#文件名：liv.py（liv 是海地克里奥尔语的书）
class Liv: # That class create a book
def __init__(self, tit, otè, id = None):
#self.id = id
self.tit = tit
self.otè = otè
self.disponib = True # Liv lan disponib pa defo
self.id = id
#文件名：数据库.py
import sqlite3
from liv import Liv
# bibliyotek means bookstore in Haitian
class Database:
def __init__(self, db_name="bibliyotek.db"):
self.conn = sqlite3.connect(db_name)
self.cursor = self.conn.cursor()
self.create_tables()
def create_tables(self):
# Kreye tab pou bibliyotèk ak liv yo
self.cursor.execute("""
CREATE TABLE IF NOT EXISTS bibliyotek (
id INTEGER PRIMARY KEY,
nom TEXT NOT NULL
)
""")
self.cursor.execute("""
CREATE TABLE IF NOT EXISTS liv (
id INTEGER PRIMARY KEY,
tit TEXT,
otè TEXT,
bibliyotek_id INTEGER,
FOREIGN KEY (bibliyotek_id) REFERENCES bibliyotek(id)
)
""")
self.conn.commit()
def ajoute_bibliyotek(self, nom):
bibliyotek_id = self.get_bibliyotek_id(nom)
if bibliyotek_id is None:
self.cursor.execute("INSERT INTO bibliyotek (nom) VALUES (?)", (nom,))
self.conn.commit()
return self.cursor.lastrowid
return bibliyotek_id
def get_bibliyotek_id(self, nom):
self.cursor.execute("SELECT id FROM bibliyotek WHERE nom = ?", (nom,))
result = self.cursor.fetchone()
return result[0] if result else None
def ajoute_liv(self, liv, bibliyotek_id):
self.cursor.execute(
"INSERT INTO liv (tit, otè, bibliyotek_id) VALUES (?, ?, ?)",
(liv.tit, liv.otè, bibliyotek_id)
)
self.conn.commit()
liv_id = self.cursor.lastrowid # Rekipere id a otomatikman
return liv_id # Retounen id nouvo liv la
def get_bibliyotek_yo(self):
self.cursor.execute("SELECT id, nom FROM bibliyotek")
rows = self.cursor.fetchall()
return rows
def get_liv_pa_bibliyotek(self, bibliyotek_id):
self.cursor.execute("SELECT id, tit, otè FROM liv WHERE bibliyotek_id = ?", (bibliyotek_id,))
rows = self.cursor.fetchall()
return [Liv(tit, otè, id=liv_id) for tit, otè, liv_id in rows]
# return Liv(id=liv_id, tit, otè)
def close(self):
self.conn.close()
def efase_bibliyotek(self, bibliyotek_id): # Delete bookstore function, it works well
self.cursor.execute("SELECT COUNT(*) FROM liv WHERE bibliyotek_id = ?", (bibliyotek_id,))
liv_count = self.cursor.fetchone()[0]
if liv_count > 0:
return False # gen liv nan bibliytèk la li poko ka efase
else:
# self.cursor.execute("DELETE FROM liv WHERE bibliyotek_id = ?", (bibliyotek_id))
self.cursor.execute("DELETE FROM bibliyotek WHERE id = ?", (bibliyotek_id,))
self.conn.commit()
return True # Retounen True si efase bibliyotèk reyisi
def efase_liv(self, liv_id): #delete book function it doesn't work.
self.cursor.execute("DELETE FROM liv WHERE id = ?", (liv_id,))
#changes = self.conn.total_changes
self.conn.commit()
#return changes > 0
#文件名：bibliyotek.py
from liv import Liv
from database import Database
class Bibliyotek:
def __init__(self, non, db):
self.non = non
self.db = db
self.id = db.ajoute_bibliyotek(non)
def ajoute_liv(self, liv):
# self.db.ajoute_liv(liv, self.id)
liv_id = self.db.ajoute_liv(liv, self.id)
liv.id = liv_id # Mete id a nan objè liv la
def montre_liv_disponib(self):
liv_disponib = self.db.get_liv_pa_bibliyotek(self.id)
if liv_disponib:
for liv in liv_disponib:
print(f"Id: {liv.tit}. Tit: {liv.id}, Otè: {liv.otè}")
else:
print("Pa gen liv disponib nan bibliyotèk sa a.")
def efase_liv(self, liv_id):
self.db.efase_liv(liv_id)
和main.py
from database import Database
from bibliyotek import Bibliyotek
from liv import Liv
def meni_efasman(db, bibliyotek_yo):
chwa = input("Tape '1' pou w efase yon liv oswa '2' pou w efase yon bibliyotèk: ")
if chwa == '1':
print("\nBibliyotèk disponib:")
for idx, bibliyotek in enumerate(bibliyotek_yo):
print(f"{idx + 1}. {bibliyotek.non}")
bibliyotek_chwa = int(input("Chwazi bibliyotèk kote ou vle efase liv la (pa nimewo): ")) - 1
bibliyotek = bibliyotek_yo[bibliyotek_chwa]
print("\nLiv disponib:")
liv_yo = db.get_liv_pa_bibliyotek(bibliyotek.id)
for idx, liv in enumerate(liv_yo):
print(f"{idx + 1}. {liv.tit} pa {liv.otè}")
liv_chwa = int(input("Chwazi liv ou vle efase a (pa nimewo): ")) - 1
liv = liv_yo[liv_chwa]
if db.efase_liv(liv.id):
print("Liv la efase avèk siksè.")
else:
print("Liv la pa efase.")
elif chwa == '2':
print("\nBibliyotèk disponib:")
for idx, bibliyotek in enumerate(bibliyotek_yo):
print(f"{idx + 1}. {bibliyotek.non}")
bibliyotek_chwa = int(input("Chwazi bibliytèk ou vle efase a (pa nimewo): ")) - 1
bibliyotek = bibliyotek_yo[bibliyotek_chwa]
if not db.efase_bibliyotek(bibliyotek.id):
print("Bibliyotèk sa a gen liv ladan l toujou. Tanpri efase tout liv yo avan ou efase bibliyotèk la.")
else:
print("Bibliyotèk la efase avèk siksè.")
def meni_prensipal():
db = Database()
bibliyotek_yo = []
# Chaje bibliyotèk ki deja egziste yo
bibliyotek_rows = db.get_bibliyotek_yo()
for bibliyotek_id, non, in bibliyotek_rows:
bibliyotek = Bibliyotek(non, db)
bibliyotek.id = bibliyotek_id
bibliyotek_yo.append(bibliyotek)
while True:
print("\n1. Ajoute yon Bibliyotèk")
print("2. Ajoute yon Liv nan yon Bibliyotèk")
print("3. Montre Liv nan yon Bibliyotèk")
print("4. Efase yon liv oswa yon bibliyotèk")
print("5. Kite Pwogram nan")
chwa = input("Chwazi yon opsyon: ")
if chwa == "1":
non_bibliyotek = input("Antre non bibliyotèk la: ")
bibliyotek = Bibliyotek(non_bibliyotek, db)
bibliyotek_yo.append(bibliyotek)
print(f"Bibliyotèk '{non_bibliyotek}' ajoute avèk siksè.")
elif chwa == "2":
if not bibliyotek_yo:
print("Pa gen bibliyotèk pou ajoute liv. Tanpri ajoute yon bibliyotèk an premye.")
continue
for idx, bibliyotek in enumerate(bibliyotek_yo):
print(f"{idx + 1}. {bibliyotek.non}")
chwazi_bibliyotek = int(input("Chwazi yon bibliyotèk: ")) - 1
if 0 <= chwazi_bibliyotek < len(bibliyotek_yo):
tit = input("Antre tit liv la: ")
otè = input("Antre non otè liv la: ")
liv = Liv(tit, otè)
bibliyotek_yo[chwazi_bibliyotek].ajoute_liv(liv)
print(f"Liv '{tit}' ajoute nan bibliyotèk '{bibliyotek_yo[chwazi_bibliyotek].non}' avèk siksè.")
else:
print("Chwa sa a pa valab.")
elif chwa == "3":
if not bibliyotek_yo:
print("Pa gen bibliyotèk pou montre liv. Tanpri ajoute yon bibliyotèk an premye.")
continue
for idx, bibliyotek in enumerate(bibliyotek_yo):
print(f"{idx + 1}. {bibliyotek.non}")
chwazi_bibliyotek = int(input("Chwazi yon bibliyotèk: ")) - 1
if 0 <= chwazi_bibliyotek < len(bibliyotek_yo):
bibliyotek_yo[chwazi_bibliyotek].montre_liv_disponib()
else:
print("Chwa sa a pa valab.")
elif chwa == "4":
meni_efasman(db, bibliyotek_yo)
elif chwa == "5":
print("Mèsi paske w te itilize pwogram nan. Orevwa!")
break
else:
print("Tanpri chwazi yon opsyon valab.")
db.close()
meni_prensipal()
efase_liv（海地语中的delete_book）不起作用，但我没有收到任何错误消息。我不知道为什么它不起作用。 谢谢你的帮助。
我对您的代码进行了多项更改以修复功能和错误处理。
class Bibliyotek:
def __init__(self, non, db):
self.non = non
self.db = db
self.id = db.ajoute_bibliyotek(non)
def ajoute_liv(self, liv):
liv_id = self.db.ajoute_liv(liv, self.id)
liv.id = liv_id
def montre_liv_disponib(self):
liv_disponib = self.db.get_liv_pa_bibliyotek(self.id)
if liv_disponib:
for liv in liv_disponib:
print(f"Id: {liv.id}, Tit: {liv.tit}, Otè: {liv.otè}") # Fixed order
else:
print("Pa gen liv disponib nan bibliyotèk sa a.")
def efase_liv(self, liv_id):
return self.db.efase_liv(liv_id) # Return the result
def get_liv_pa_bibliyotek(self, bibliyotek_id):
self.cursor.execute("SELECT id, tit, otè FROM liv WHERE bibliyotek_id = ?", (bibliyotek_id,))
rows = self.cursor.fetchall()
return [Liv(tit=row[1], otè=row[2], id=row[0]) for row in rows] # Fixed order of parameters
def efase_liv(self, liv_id):
try:
self.cursor.execute("SELECT COUNT(*) FROM liv WHERE id = ?", (liv_id,))
count = self.cursor.fetchone()[0]
if count == 0:
return False # Book doesn't exist
self.cursor.execute("DELETE FROM liv WHERE id = ?", (liv_id,))
self.conn.commit()
return True # Successfully deleted
except sqlite3.Error:
return False # Error occurred during deletion
def meni_efasman(db, bibliyotek_yo):
chwa = input("Tape '1' pou w efase yon liv oswa '2' pou w efase yon bibliyotèk: ")
if chwa == '1':
print("\nBibliyotèk disponib:")
for idx, bibliyotek in enumerate(bibliyotek_yo):
print(f"{idx + 1}. {bibliyotek.non}")
try:
bibliyotek_chwa = int(input("Chwazi bibliyotèk kote ou vle efase liv la (pa nimewo): ")) - 1
if bibliyotek_chwa < 0 or bibliyotek_chwa >= len(bibliyotek_yo):
print("Nimewo bibliyotèk la pa valab.")
return
bibliyotek = bibliyotek_yo[bibliyotek_chwa]
print("\nLiv disponib:")
liv_yo = db.get_liv_pa_bibliyotek(bibliyotek.id)
if not liv_yo:
print("Pa gen liv nan bibliyotèk sa a.")
return
for idx, liv in enumerate(liv_yo):
print(f"{idx + 1}. {liv.tit} pa {liv.otè} (ID: {liv.id})")
liv_chwa = int(input("Chwazi liv ou vle efase a (pa nimewo): ")) - 1
if liv_chwa < 0 or liv_chwa >= len(liv_yo):
print("Nimewo liv la pa valab.")
return
liv = liv_yo[liv_chwa]
if bibliyotek.efase_liv(liv.id):
print("Liv la efase avèk siksè.")
else:
print("Liv la pa t ka efase. Tanpri eseye ankò.")
except ValueError:
print("Tanpri antre yon nimewo valab.")
return
elif chwa == '2':
# ... (keep the rest of the function the same)
删除功能不起作用的主要原因：