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Python實(shí)現(xiàn)完整的事務(wù)操作示例

更新時間：2017年06月20日 08:31:32 作者：北京流浪兒

這篇文章主要介紹了Python實(shí)現(xiàn)完整的事務(wù)操作,結(jié)合實(shí)例形式分析了Python操作mysql數(shù)據(jù)庫相關(guān)事務(wù)操作的具體流程與實(shí)現(xiàn)技巧,需要的朋友可以參考下

本文實(shí)例講述了Python事務(wù)操作實(shí)現(xiàn)方法。分享給大家供大家參考，具體如下：

#coding=utf-8
import sys
import MySQLdb
class TransferMoney(object):
  def __init__(self,conn):
    self.conn = conn
  #檢查賬戶是否合法
  def check_acct_avaiable(self,acctid):
    cursor = self.conn.cursor()
    try:
      sql = "select * from account where acctid=%s" % acctid
      cursor.execute(sql)
      print "check account:" + sql
      rs = cursor.fetchall()
      if len(rs) != 1:
        raise Exception("account %s illega" % acctid)
    finally:
      cursor.close()
  #檢查是否有足夠的錢
  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("account %s not enough money" % acctid)
    finally:
      cursor.close()
  #賬戶減錢
  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("reduce money fail %s" % acctid)
    finally:
      cursor.close()
  #賬戶加錢
  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("add money fail %s" % acctid)
    finally:
      cursor.close()
  #主執(zhí)行語句
  def transfer(self,source_acctid,target_acctid,money):
    try:
      self.check_acct_avaiable(source_acctid)
      self.check_acct_avaiable(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
if __name__ == "__main__":
  source_acctid = sys.argv[1]
  target_acctid = sys.argv[2]
  money = sys.argv[3]
  conn = MySQLdb.Connect(host = '127.0.0.1',port=3306,user='root',passwd='',db='test',charset='utf8')
  tr_money = TransferMoney(conn)
  try:
    tr_money.transfer(source_acctid,target_acctid,money)
  except Exception as e:
    print "Happen:" + str(e)
  finally:
    conn.close()

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希望本文所述對大家Python程序設(shè)計有所幫助。

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