說實話，第一次寫這麼長的Python程式碼，期間遇到了很多問題，但是，最終還是完成了，花了我一天半的時間，嘿嘿~~~

該程式實現了使用者的增，刪，改，查，主要用到sqlite3模組。對於該模組的知識點，請檢視我的另一篇文章SQLite-Python

如有更好的建議，請私信，本人將不勝榮幸，讓我們一起來學習Python！

#-*- coding:utf-8 -*-
import sqlite3
#開啟本地資料庫用於儲存使用者資訊
conn = sqlite3.connect('mysql_person.db')

#在該資料庫下建立表，建立表的這段程式碼在第一次執行後需要註釋掉，否則再次執行程式會一直提示：該表已存在
 

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()

#增加使用者資訊
def insert():
    ID = input('請輸入使用者ID:\n'
 
)
    NAME = raw_input('請輸入使用者暱稱:\n')
    AGE = input('請輸入年齡:\n')
    ADDRESS = raw_input('請輸入使用者地址:\n')
    SALARY = input('請輸入使用者薪水:\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"

#刪除使用者資訊
def delete():
    name = raw_input("請輸入所要刪除的聯絡人姓名:")
    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,不存在該使用者"

#修改使用者資訊
def modify():
    name = raw_input("請輸入要修改使用者的姓名:")
    print search()
    sql4 = "SELECT id, name, age,address, salary  from MT where name = '%s';"%name
    cursor = conn.execute(sql4)
    x = raw_input("請輸入要修改使用者的新地址:")
    y = input("請輸入要修改使用者的新年齡:")
    z = input("請輸入要修改使用者的新薪水:")
    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"


#查詢使用者資訊
conn = sqlite3.connect('mysql_person.db')

def search():
    conn = sqlite3.connect('mysql_person.db')
    name = raw_input('請輸入要查詢的使用者姓名')
    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,沒有該使用者資訊"

#顯示所有使用者資訊
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個使用者"%row[0]

def menu():
    print '1.新增聯絡人'
    print '2.刪除聯絡人'
    print '3.修改聯絡人'
    print '4.查詢聯絡人'
    print '5.顯示所有聯絡人'
    print '6.退出程式'
    print 'What do you want to do?'
while True:
    menu()
    x = raw_input('請輸入您的選擇選單號:')
    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 "謝謝使用！"
        exit()
        continue
    else:
        print "輸入的選項不存在，請重新輸入！"
        continue