何时调用SaveChanges [英] When to call SaveChanges

问题描述

说我有在Controller中调用的类似内容:

Say I have something like this that is called in Controller:

using (var context = new SqlContext())
{
    context.Items.Add(new Item("item1"));
}

我应该打context.SaveChanges();吗?

推荐答案

实体框架使用DbContext实现工作单元模式，这意味着您定义了要对数据库执行的操作的包，然后调用save更改进行传播将它们全部一次存储到数据库中.所有操作都将在一个事务中执行(对于单个saveChanges调用)，这意味着全部或全部都不会立即传播到数据库.

entity framework implements a unit of work pattern with DbContext this means that you define a package of things you want to do to your database and then call save changes to propogate them all to the database at once. All operations will be executed within a single transaction (for a single saveChanges call) which means that either all or none will be propogated to the database at once.

在调用保存更改之前，更改将应用​​于本地跟踪图，而不应用于数据库本身，直到调用savechanges.

Before calling save changes, the changes are applied to your local tracking graph but not to the database itself until savechanges is called.

这篇关于何时调用SaveChanges的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！