python操作数据库之sqlite3打开数据库、删除、修改示例

#coding=utf-8
__auther__ = 'xianbao'
import sqlite3
# 打开数据库
def opendata():
conn = sqlite3.connect("mydb.db")
cur = conn.execute("""create table if not exists tianjia(
id integer primary key autoincrement, username varchar(128), passworld varchar(128),
address varchar(125), telnum varchar(128))""")
return cur, conn
#查询全部的信息

def showalldata():
print "-------------------处理后后的数据-------------------"
hel = opendata()
cur = hel[1].cursor()
cur.execute("select * from tianjia")
res = cur.fetchall()
for line in res:
for h in line:
print h,
print
cur.close()
#输入信息

def into():
username1 = str(raw_input("请输入您的用户名："))
passworld1 = str(raw_input("请输入您的密码："))
address1 = str(raw_input("请输入您的地址："))
telnum1 = str(raw_input("请输入您的联系电话："))
return username1, passworld1, address1, telnum1
# (添加) 往数据库中添加内容

def adddata():
welcome = """-------------------欢迎使用添加数据功能---------------------"""
print welcome
person = into()
hel = opendata()
hel[1].execute("insert into tianjia(username, passworld, address, telnum)values (?,?,?,?)",
(person[0], person[1], person[2], person[3]))
hel[1].commit()
print "-----------------恭喜你数据，添加成功----------------"
showalldata()
hel[1].close()
# （删除）删除数据库中的内容

def deldata():
welcome = "------------------欢迎您使用删除数据库功能------------------"
print welcome
delchoice = raw_input("请输入您想要删除用户的编号：")
hel = opendata() # 返回游标conn
hel[1].execute("delete from tianjia where id ="+delchoice)
hel[1].commit()
print "-----------------恭喜你数据，删除成功----------------"
showalldata()
hel[1].close()
# （修改）修改数据的内容

def alter():
welcome = "--------------------欢迎你使用修改数据库功能-----------------"
print welcome
changechoice = raw_input("请输入你想要修改的用户的编号:")
hel =opendata()
person = into()
hel[1].execute("update tianjia set username=?, passworld= ?,address=?,telnum=? where id="+changechoice,
(person[0], person[1], person[2], person[3]))
hel[1].commit()
showalldata()
hel[1].close()
# 查询数据

def searchdata():
welcome = "--------------------欢迎你使用查询数据库功能-----------------"
print welcome
choice = str(raw_input("请输入你要查询的用户的编号："))
hel = opendata()
cur = hel[1].cursor()
cur.execute("select * from tianjia where id="+choice)
hel[1].commit()
row = cur.fetchone()
id1 = str(row[0])
username = str(row[1])
passworld = str(row[2])
address = str(row[3])
telnum = str(row[4])
print "-------------------恭喜你，你要查找的数据如下---------------------"
print ("您查询的数据编号是%s" % id1)
print ("您查询的数据名称是%s" % username)
print ("您查询的数据密码是%s" % passworld)
print ("您查询的数据地址是%s" % address)
print ("您查询的数据电话是%s" % telnum)
cur.close()
hel[1].close()
# 是否继续

def contnue1(a):
choice = raw_input("是否继续？（y or n):")
if choice == 'y':
a = 1
else:
a = 0
return a

if __name__ == "__main__":
flag = 1
while flag:
welcome = "---------欢迎使用仙宝数据库通讯录---------"
print welcome
choiceshow = """
请选择您的进一步选择：
(添加)往数据库里面添加内容
(删除)删除数据库中内容
(修改)修改书库的内容
（查询）查询数据的内容
选择您想要的进行的操作：
"""
choice = raw_input(choiceshow)
if choice == "添加":
adddata()
contnue1(flag)
elif choice == "删除":
deldata()
contnue1(flag)
elif choice == "修改":
alter()
contnue1(flag)
elif choice == "查询":
searchdata()
contnue1(flag)
else:
print "你输入错误，请重新输入"