基于PysimpleGUI+pymysql建立的简单管理系统（4）—删除功能
紧接上文，我们接下来来讲delete.py。
通过之前文章的menu.py登录界面，我们选择第二个功能，删除功能。
我们在插入功能所创建的数据表的基础上，要对其进行删除操作的同时，我们需要注意的是如何设计这个用户界面。
这里我们使用的是pysimplegui里面的listbox列表框元素，它可以在展示数据的同时，增添了用户的互动性，我们仅仅只需要将导出来的数据进行列表化就可以了。
之后，进行insert.py的代码展示：
import pymysql #导入库
import PySimpleGUI as sg
import pandas as pd
import os
import time
import threading
conn = pymysql.connect(host="localhost", #建立mysql的连接
user="root",
password="******",
db="user_information",
charset="utf8")
cursor = conn.cursor()
sql ="select * from custome_information"
cursor.execute(sql)
result = cursor.fetchall()
all = list(result) #将数据列表化
cursor.close()
conn.close()
layout = [[sg.Text("客户名 订单名 时间 材料 尺寸 数量 单价 金额")], #gui界面设计
[sg.Listbox(all, key='-TEXT-', select_mode='single',size=(80, 6))],
[sg.Button('返回'),sg.Button('删除'),sg.Button('查找'),sg.Button('退出')]]
window = sg.Window('删除客户账单', layout)
while True:
event, values = window.read() #提取用户动作以及值
if event == sg.WINDOW_CLOSED or event == '退出':
break
if event == '返回': #返回至菜单界面
time.sleep(0.5)
window.close()
os.system('python menu.py')
break
if event == '删除': #删除操作
values = pd.DataFrame.from_dict(values,orient='index') #对用户所选的列进行清洗
str1 = str(values.iat[0,0])
custome_name = str1.split("\'")[1] #提取对应的值
order_name = str1.split("\'")[3]
material = str1.split("\'")[5]
size = str1.split("\'")[7]
quantity = str1.split(",")[9]
price = str1.split(",")[10]
amount = str1.split(",")[11].strip(')')
cursor = conn.cursor()
conn.ping(reconnect=True) #添加互斥锁，以防mysql连接丢失
thread_lock = threading.Lock()
thread_lock.acquire()
sql ="delete from custome_information where custome_name = '%s' and order_name = '%s' and material = '%s' and size = '%s' and quantity = '%s' and price = '%s' and amount = '%s'" %(custome_name,order_name,material,size,quantity,price,amount)
cursor.execute(sql)
conn.commit()
conn.close()
thread_lock.release()
time.sleep(0.5)
window.close()
layout = [[sg.Text("已删除")], #删除成功，给予一个反馈界面
[sg.Button('返回'),sg.Button('继续')]]
window = sg.Window('已删除', layout)
while True:
event, values = window.read()
if event == sg.WINDOW_CLOSED or event == '返回': #返回主菜单
time.sleep(0.5)
window.close()
os.system('python menu.py')
break
if event == '继续': #继续删除对象
time.sleep(0.5)
window.close()
os.system('python delete.py')
break
if event == '查找': #查找功能（之后在查找功能里会讲）
window.close()
layout = [[sg.Text("请输入要查找的客户名：")],
[sg.Input(key='-INPUT-')],
[sg.Button('确定'),sg.Button('返回'),sg.Button('退出')]]
window = sg.Window('查找', layout)
while True:
event, values = window.read()
if event == sg.WINDOW_CLOSED or event == '退出':
break
if event == '返回':
time.sleep(0.5)
window.close()
os.system('python delete.py')
break
if event == '确定':
window.close()
values = pd.DataFrame([values])
custome_name = str(values.iat[0,0])
cursor = conn.cursor()
conn.ping(reconnect=True)
thread_lock = threading.Lock()
thread_lock.acquire()
sql ="select * from custome_information where custome_name = '%s'"%(custome_name)
cursor.execute(sql)
result = cursor.fetchall()
all1 = list(result)
cursor.close()
conn.close()
thread_lock.release()
layout = [[sg.Text("客户名 订单名 时间 材料 尺寸 数量 单价 金额")],
[sg.Listbox(all1, key='-TEXT-', select_mode='single',size=(80, 6))],
[sg.Button('返回'),sg.Button('删除'),sg.Button('退出')]]
window = sg.Window('查找', layout)
while True:
event, values = window.read()
if event == sg.WINDOW_CLOSED or event == '退出':
break
if event == '返回':
time.sleep(0.5)
window.close()
os.system('python delete.py')
break
if event == '删除':
values = pd.DataFrame.from_dict(values,orient='index')
str1 = str(values.iat[0,0])
custome_name = str1.split("\'")[1]
order_name = str1.split("\'")[3]
material = str1.split("\'")[5]
size = str1.split("\'")[7]
quantity = str1.split(",")[9]
price = str1.split(",")[10]
amount = str1.split(",")[11].strip(')')
cursor = conn.cursor()
conn.ping(reconnect=True)
thread_lock = threading.Lock()
thread_lock.acquire()
sql ="delete from custome_information where custome_name = '%s' and order_name = '%s' and material = '%s' and size = '%s' and quantity = '%s' and price = '%s' and amount = '%s'" %(custome_name,order_name,material,size,quantity,price,amount)
cursor.execute(sql)
conn.commit()
conn.close()
thread_lock.release()
time.sleep(0.5)
window.close()
layout = [[sg.Text("已删除")],
[sg.Button('返回'),sg.Button('继续')]]
window = sg.Window('已删除', layout)
while True:
event, values = window.read()
if event == sg.WINDOW_CLOSED or event == '返回':
time.sleep(0.5)
window.close()
os.system('python menu.py')
break
if event == '继续':
time.sleep(0.5)
window.close()
os.system('python delete.py')
break 运行截图：
之后将持续更新，revise.py修改操作。