How do you support optimistic / pessimistic concurrency using NHibernate?
您如何使用NHibernate来支持乐观/悲观的并发性?
3 个解决方案
#1
16
NHibernate, by default, supports optimistic concurrency. Pessimistic concurrency, on the other hand, can be accomplished through the ISession.Lock() method.
默认情况下，NHibernate支持乐观并发。另一方面，可以通过ISession.Lock()方法实现悲观并发。
These issues are discussed in detail in this document.
本文将详细讨论这些问题。
#2
22
NHibernate supports 2 types of optimistic concurrency.
NHibernate支持两种类型的乐观并发。
You can either have it check dirty fields by using "optimistic-lock=dirty" attribute on the "class" element in your mapping files or you can use "optimistic-lock=version" (which is also the default). If you are using version you need to provide a "version" element in your mapping file that maps to a field in your database.
您可以通过在映射文件中的“class”元素上使用“optimislock =dirty”属性来检查脏字段，或者您可以使用“optimislock =version”(这也是默认的)。如果您正在使用版本，您需要在映射文件中提供一个“版本”元素，映射到数据库中的一个字段。
Version can be of type Int64, Int32, Int16, Ticks, Timestamp, or TimeSpan and are automatically incremented on save. See Chapter 5 in the NHibernate documentation for more info.
版本可以是Int64、Int32、Int16、嘀嗒、时间戳或TimeSpan，并且在保存时自动递增。有关更多信息，请参见NHibernate文档中的第5章。
#3
2
You can also 'just' manually compare the version numbers (assuming you've added a Version property to your entity).
您还可以“仅”手动比较版本号(假设您已经向实体添加了一个版本属性)。
Clearly Optimistic is the only sane option. Sometimes of course, we have to deal with crazy scenarios however...
显然，乐观是唯一明智的选择。当然，有时我们不得不面对疯狂的场景……
#1
16
NHibernate, by default, supports optimistic concurrency. Pessimistic concurrency, on the other hand, can be accomplished through the ISession.Lock() method.
默认情况下，NHibernate支持乐观并发。另一方面，可以通过ISession.Lock()方法实现悲观并发。
These issues are discussed in detail in this document.
本文将详细讨论这些问题。
#2
22
NHibernate supports 2 types of optimistic concurrency.
NHibernate支持两种类型的乐观并发。
You can either have it check dirty fields by using "optimistic-lock=dirty" attribute on the "class" element in your mapping files or you can use "optimistic-lock=version" (which is also the default). If you are using version you need to provide a "version" element in your mapping file that maps to a field in your database.
您可以通过在映射文件中的“class”元素上使用“optimislock =dirty”属性来检查脏字段，或者您可以使用“optimislock =version”(这也是默认的)。如果您正在使用版本，您需要在映射文件中提供一个“版本”元素，映射到数据库中的一个字段。
Version can be of type Int64, Int32, Int16, Ticks, Timestamp, or TimeSpan and are automatically incremented on save. See Chapter 5 in the NHibernate documentation for more info.
版本可以是Int64、Int32、Int16、嘀嗒、时间戳或TimeSpan，并且在保存时自动递增。有关更多信息，请参见NHibernate文档中的第5章。
#3
2
You can also 'just' manually compare the version numbers (assuming you've added a Version property to your entity).
您还可以“仅”手动比较版本号(假设您已经向实体添加了一个版本属性)。
Clearly Optimistic is the only sane option. Sometimes of course, we have to deal with crazy scenarios however...
显然，乐观是唯一明智的选择。当然，有时我们不得不面对疯狂的场景……