MySql EF事务using不会自动 Rollback的bug

EF to MySql一般都是用using最后Commit,一直以为最后没Commit,当using调用Dispose会自动Rollback,没想到这儿有个坑,mysql有个bug并不会Rollback,事务也不会关闭,所以再次BeginTransaction就会报An error occurred while starting a transaction on the provider connection. See the inner exception for details.错误详情是Nested transactions are not supported.

所以用 EF to MySql一定要记得try catch  Rollback

例子如下

            using (var db = new OtoRCEntities())
            {
                using (var tran = db.Database.BeginTransaction())
                {
                    try
                    {
                        db.Database.ExecuteSqlCommand("update xxx");
                        tran.Commit();
                    }
                    catch (Exception)//这儿try catch 是用来报错了没有Commit,按理说using后应该自动Rollback
                    {

                    }

                }
            }
            using (var db = new OtoRCEntities())
            {
                using (var tran = db.Database.BeginTransaction())//到这儿就会报错
                {
                    try
                    {
                        db.Database.ExecuteSqlCommand("update xxx");
                        tran.Commit();
                    }
                    catch (Exception)
                    {

                    }

                }
            }

　

　　具体MySql bug地址: http://bugs.mysql.com/bug.php?id=71502