python-mysql实现简单功能

记录我在慕课上学的一段代码

# coding=utf-8import sysimport MySQLdbclass TransferMoney(object):    def __init__(self, conn):        self.conn = conn    def check_acct_available(self, acctid):        cursor = self.conn.cursor()        try:            sql = "select * from account where acctid=%s" % acctid            cursor.execute(sql)            print "check_acct_available:" + sql            rs = cursor.fetchall()            if len(rs) != 1:                raise Exception("账户%s不存在" % acctid)        finally:            cursor.close()    def has_enough_money(self, acctid, money):        cursor = self.conn.cursor()        try:            sql = "select * from account where acctid=%s and money>%s" % (acctid,money)            cursor.execute(sql)            print "has_enough_money:" + sql            rs = cursor.fetchall()            if len(rs) != 1:                raise Exception("账户%s没有足够的钱" % acctid)        finally:            cursor.close()    def reduce_money(self, acctid, money):        cursor = self.conn.cursor()        try:            sql = "update account set money=money-%s where acctid=%s" % (money,acctid)            cursor.execute(sql)            print "reduce_money:" + sql            if cursor.rowcount != 1:                raise Exception("账户%s减款失败" % acctid)        finally:            cursor.close()    def add_money(self, acctid, money):        cursor = self.conn.cursor()        try:            sql = "update account set money=money+%s where acctid=%s" % (money,acctid)            cursor.execute(sql)            print "add_money:" + sql            if cursor.rowcount != 1:                raise Exception("账户%s加款失败" % acctid)        finally:            cursor.close()    def transfer(self, source_acctid, target_acctid, money):        try:            self.check_acct_available(source_acctid)            self.check_acct_available(target_acctid)            self.has_enough_money(source_acctid, money)            self.reduce_money(source_acctid, money)            self.add_money(target_acctid, money)            self.conn.commit()        except Exception as e:            self.conn.rollback()            raise e#  先写程序的入口if __name__ == "__main__":    source_acctid = sys.argv[1]    target_acctid = sys.argv[2]    money = sys.argv[3]#  连接到数据库    conn = MySQLdb.connect(host="localhost",port=3306,user="root",passwd="数据库密码",db="数据库名",charset="utf8")    tr_money = TransferMoney(conn)    try:        tr_money.transfer(source_acctid, target_acctid, money)    except Exception as e:        print "出现问题" + str(e)    finally:        conn.close()

当然要先在自己的数据库中创建一个account表，然后在表中插入相应数据