在LINQ to SQL 中,以開發人員之程式設計語言表示的物件模型會對應至關聯式資料庫的資料模型。 然後就會根據物件模型對資料執行作業。 在這種情況下,您不會發出資料庫命令 (例如,INSERT) 至資料庫。 而是在您的物件模型中變更值和執行方法。 當您要查詢資料庫或將變更傳送至資料庫時,LINQ to SQL 會將您的要求...
在LINQ to SQL 中通常使用这种方式来重写 Insert、Update、Delete 的默认方法以及在对象生命周期事件过程中验证属性。有关更多信息,请参见分部方法 (Visual Basic) (Visual Basic) 或 分部(方法) (C#)。示例说明下面的示例首先显示了 ExampleClass,因为它可能是由像 SQLMetal 这样的代码生成工具定义的;然后,此示例...
It tells LINQ to SQL that the database column is part of the primary key in the table. As with the Table attribute, you only need to supply information in the Column attribute if it differs from what can be deduced from your field or property declaration. In this example, you need to...
One of the things you'll notice when using the LINQ to SQL designer is that it automatically "pluralizes" the various table and column names when it creates entity classes based on your database schema. For example: the "Products" table in our example above resulted in a "Product" class,...
For example, I could write the below LINQ expression to retrieve a single Product object by searching on the Product name: 通过LINQ to SQL设计器我们定义了5个数据模型类:Product(产品), Category(类别), Customer(客户), Order(订单)和 OrderDetail(订单明细)。每个类的属性映射数据库中对应表的列。每...
LINQ to SQL 是Visual Studio Code名称“Orcas”的组件,它提供运行时基础结构,用于将关系数据作为对象进行管理,而不会失去查询功能。 它通过将语言集成查询转换为 SQL 供数据库执行,然后将表格结果转换回你定义的对象来执行此操作。 然后,应用程序可以自由操作对象,而 LINQ to SQL 则会自动在后台跟踪更改。
These articles focus on the binding and validation and use a connected model; meaning that the DataContext is alive and available tracking the changes we make to the collections of LINQ to SQL objects. Out of the box, LINQ to SQL is really easy to get working with a ...
These articles focus on the binding and validation and use a connected model; meaning that the DataContext is alive and available tracking the changes we make to the collections of LINQ to SQL objects. Out of the box, LINQ to SQL is really easy to get working with a...
For example, a database row might map to an object, or a field in a database might map to a property. Some mappings are simple, like the ones I’ve already mentioned; others are more complex such as parts of multiple rows combining to form a single object. LINQ to SQL has a ...
Sometimes people wonder if it is possible to use LINQ to SQL without having to use the designer and the automaticallygenerated .dbml files and classes. The short answer is yes, and it is not even very hard to do.In the end it may be worth using the designer, for example,...