说实话，第一次写这么长的Python代码，期间遇到了很多问题，但是，最终还是完成了，花了我一天半的时间。

该程序实现了用户的增，删，改，查，主要用到sqlite3模块。对于该模块的知识点，请查看我的另一篇文章SQLite-Python

如有更好的建议，请私信，本人将不胜荣幸，让我们一起来学习Python！

#-*- coding:utf-8 -*-

import sqlite3

#打开本地数据库用于存储用户信息

conn = sqlite3.connect('mysql_person.db')

#在该数据库下创建表，创建表的这段代码在第一次执行后需要注释掉，否则再次执行程序会一直提示：该表已存在

conn.execute('''CREATE TABLE MT

(ID INT PRIMARY KEY NOT NULL,

NAME TEXT NOT NULL,

AGE INT NOT NULL,

ADDRESS CHAR(50),

SALARY REAL);''')

print "Table created successfully";

conn.close()

#增加用户信息

def insert():

ID = input('请输入用户ID:\n')

NAME = raw_input('请输入用户昵称:\n')

AGE = input('请输入年龄:\n')

ADDRESS = raw_input('请输入用户地址:\n')

SALARY = input('请输入用户薪水:\n')

sql1 = 'insert into MT(ID,NAME,AGE,ADDRESS,SALARY)'

sql1 += 'values("%d","%s","%d","%s","%d");'%(ID,NAME,AGE,ADDRESS,SALARY)

conn.execute(sql1)

conn.commit()

print "Records insert successfully"

#删除用户信息

def delete():

name = raw_input("请输入所要删除的联系人姓名:")

cursor = conn.execute("SELECT name from MT where name = '%s';"%name)

for row in cursor:

if name == row[0]:

conn.execute("DELETE from MT where name = '%s';"%name)

conn.commit()

print "Records delete successfully"

break

else:

print "sorry,不存在该用户"

#修改用户信息

def modify():

name = raw_input("请输入要修改用户的姓名:")

print search()

sql4 = "SELECT id, name, age,address, salary from MT where name = '%s';"%name

cursor = conn.execute(sql4)

x = raw_input("请输入要修改用户的新地址:")

y = input("请输入要修改用户的新年龄:")

z = input("请输入要修改用户的新薪水:")

sql3 = "UPDATE MT set address = '%s',age = '%d',\

salary = '%d' where name = '%s';"%(x,y,z,name)

conn.execute(sql3)

conn.commit()

print "修改成功"

sql5 = "SELECT id, name, age,address, salary from MT where name = '%s';"%name

cursor = conn.execute(sql5)

for row in cursor:

print "ID = ", row[0]

print "NAME = ", row[1]

print "AGE = ",row[2]

print "ADDRESS = ", row[3]

print "SALARY = ", row[4], "\n"

#查询用户信息

conn = sqlite3.connect('mysql_person.db')

def search():

conn = sqlite3.connect('mysql_person.db')

name = raw_input('请输入要查询的用户姓名')

sql2 = "SELECT id,name,age, address, salary from MT where name= '%s';" % (name)

cursor = conn.execute(sql2)

for row in cursor:

print "ID = ", row[0]

print "NAME = ", row[1]

print "AGE = ",row[2]

print "ADDRESS = ", row[3]

print "SALARY = ", row[4], "\n"

break

else:

print "sorry,没有该用户信息"

#显示所有用户信息

def showall():

cursor = conn.execute("SELECT id, age, name, address, salary from MT")

for row in cursor:

print "ID = ", row[0]

print "NAME = ", row[1]

print "AGE = ",row[2]

print "ADDRESS = ", row[3]

print "SALARY = ", row[4], "\n"

print "Operation done successfully";

cursor = conn.execute("select count(*) from MT;")

for row in cursor:

print "一共有%d个用户"%row[0]

def menu():

print '1.新增联系人'

print '2.删除联系人'

print '3.修改联系人'

print '4.查询联系人'

print '5.显示所有联系人'

print '6.退出程序'

print 'What do you want to do?'

while True:

menu()

x = raw_input('请输入您的选择菜单号:')

if x == '1':

insert()

continue

if x == '2':

delete()

continue

if x == '3':

modify()

continue

if x == '4':

search()

continue

if x == '5':

showall()

continue

if x == '6':

print "谢谢使用！"

exit()

continue

else:

print "输入的选项不存在，请重新输入！"

continue

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