Entity Data Model (EDM) 深入分析, Part 3 ADO.NET Entity Framework 深入分析, Part 4 (提供示例程序下载) ADO.NET Entity Framework 深入分析, Part 5 设置并发模式 Entity Framework 实现了乐观的并发模式(Optimistic Concurrency Model)。默认情况下,在实体更新数据提交到数据库时,并不会检查并发。对于高频率...
乐观并发(Optimistic concurrency):并发令牌# 乐观并发控制(Optimistic concurrency):RowVersion# 1、SQLServer数据库可以用一个byte[]类型的属性做并发令牌属性,然后使用IsRowVersion()把这个属性设置为RowVersion类型,这样这个属性对应的数据库列就会被设置为ROWVERSION类型。对于ROWVERSION类型的列,在每次插入或更新行时,...
loads. The naïve usage of some features doesn't scale well. For example, multiple collections Includes, heavy use of lazy loading, conditional queries on non-indexed columns, massive updates and inserts with store-generated values, lack of concurrency handling, large models, inadequate cache ...
concurrency 讓多個使用者同時存取和變更共用資料的程序。 Entity Framework 預設可實作開放式同步存取模型。 direction 參考某些關聯的非對稱性質。 方向在結構描述內是與 FromRole 或ToRole 項目的 NavigationProperty 和ReferentialConstraint 屬性一起指定。 如需詳細資訊,請參閱 NavigationProperty 元素 (CSDL) 和導覽屬...
How to build the Contoso U application as an n-tier application using the ObjectDataSource control and how to handle concurrency and maximize performance.
在Entity Framework 中,您可以處理 OptimisticConcurrencyException Entity Framework 擲回的例外狀況來解決衝突。 若要得知何時應擲回這些例外狀況,Entity Framework 必須能夠偵測衝突。 因此,您必須適當的設定資料庫及資料模型。 一部分啟用衝突偵測的...
Interception for optimistic concurrency handling (DbUpdateConcurrencyException) Interception for connections before checking if the connection string has been set Interception for when EF Core has finished consuming a result set, but before that result set is closed Interception for creation of a DbCo...
Interception for optimistic concurrency handling (DbUpdateConcurrencyException) Interception for connections before checking if the connection string has been set Interception for when EF Core has finished consuming a result set, but before that result set is closed Interception for creation of a DbConnec...
See http://go.microsoft.com/fwlink/?LinkId=527962 for information on understanding and handling optimistic concurrency exceptions. 1. 2. 3. 接下来我们再来看看解决并发而设置行版本的情况。 EF Core并发解决方案二(行版本) 当我们在插入或者更新时都会产生一个新的timestamp,这个属性也会被当做一个并发Toke...
Handling optimistic concurrency Connections before checking the connection string is populated After the result set has been consumed, but before the result set is closed DbConnectioncreation DbCommandafter initialization The new events include: