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| # -*- coding: utf-8 -*- | |
| # 嵌套式事务 | |
| class OriginStore(object): | |
| cache = [] | |
| success = [] | |
| def transaction_begin(self): | |
| if len(self.cache): | |
| raise Exception('another transaction not end yet') | |
| cache = [] | |
| def execute(self, sql): | |
| if sql == 'raise': | |
| raise Exception('raise for test') | |
| self.cache.append(sql) | |
| def commit(self): | |
| self.success.extend(self.cache) | |
| self.cache = [] | |
| def rollback(self): | |
| self.cache = [] | |
| ostore = OriginStore() | |
| class Store(object): | |
| level = 0 | |
| def __enter__(self): | |
| print '[level: %s] enter, cache: %s, success: %s' % (self.level, ostore.cache, ostore.success) | |
| assert self.level >= 0 | |
| self.level += 1 | |
| def __exit__(self, tp, value, tb): | |
| print '[level: %s] exit, cache %s, success: %s' % (self.level, ostore.cache, ostore.success) | |
| assert self.level >= 0 | |
| self.level -= 1 | |
| def begin(self): | |
| if self.level == 0: | |
| ostore.transaction_begin() | |
| return self | |
| def execute(self, sql): | |
| print 'executing %s' % sql | |
| ostore.execute(sql) | |
| def commit(self): | |
| print 'commit %s' % ostore.cache | |
| if self.level in (0, 1): | |
| ostore.commit() | |
| def rollback(self): | |
| print 'rollback %s' % ostore.cache | |
| ostore.rollback() | |
| s = Store() | |
| def hello_world(): | |
| with s.begin(): | |
| try: | |
| s.execute('hello') | |
| s.execute('world') | |
| do_break() | |
| s.execute('fuck') | |
| s.execute('bitch') | |
| do_raise() | |
| except: | |
| s.rollback() | |
| else: | |
| s.commit() | |
| def do_raise(): | |
| with s.begin(): | |
| s.execute('raise') | |
| def do_break(): | |
| ''' fix this to s.commmit() ''' | |
| ostore.commit() | |
| def do_break(): | |
| ''' fix this to s.commmit() ''' | |
| ostore.commit() | |
| def main(): | |
| with s.begin(): | |
| try: | |
| hello_world() | |
| except: | |
| s.rollback() | |
| else: | |
| s.commit() | |
| if __name__ == '__main__': | |
| hello_world() |
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