python 操所sqlite3

__author__ = 'Administrator'

import sqlite3,random

src="qwertyuiopasdfghjklzxcvbnm"

def get_str(x,y):

    str_sum=random.randint(x,y)

    astr=""

    for i in range(str_sum):

        astr+=random.choice(src)

    return astr

def output():

    cur.execute("select * from mytab")

    for sid,name,ps in cur:

        print(sid," ",name," ",ps)

def output_all():

    cur.execute("select * from mytab")

    for sid,name,pas in cur.fetchall():

        print(sid," ",name," ",pas)

def get_data_list(n):

    res=[]

    for i in range(n):

        res.append((get_str(2,4),get_str(8,12)))

    return  res

if __name__=="__main__":

    print("建立连接")

    con=sqlite3.connect(":memory:")

    print("建立游标")

    cur=con.cursor()

    print("创建一张表mytable")

    cur.execute("create table mytab(id integer primary key autoincrement not null,name text ,password text)")

    print("插入一条记录")

    cur.execute("insert into mytab(name,password) values(?,?)",(get_str(2,4),get_str(8,12),))

    output()

    print("批量插入数据库")

    cur.executemany("insert into mytab(name,password) values(?,?)",get_data_list(3))

    print("显示所有记录")

    output_all()

    print("更新一条记录")

    cur.execute("update mytab set name=? where id=?",("aaa",1))

    print("显示所有记录")

    output()

    print("删除一条记录")

    cur.execute("delete from mytab where id=?",(3,))#删除一条记录

    print("显示所有记录")

    output()

    cur.close()

    con.close()