Solver Foundation LINQ to SQL example發行項 2009/06/02 Erwin, a modeling consultant and top Solver Foundation user, encountered some problems trying to do two-way data binding using DataTable objects. There are more details on this discussion thread. Ross, a member of the Solver Foundation ...
LINQ to SQL 方法与数据库存储过程 请参阅 在LINQ to SQL 中,用开发人员所用的编程语言表示的对象模型映射到关系数据库的数据模型。 然后就会按照对象模型来执行对数据的操作。在这种情况下,您无需向数据库发出数据库命令(例如,INSERT), 而是在对象模型中更改值和执行方法。 当你需要查询数据库或向其发送更改...
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...
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,...
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) 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,此示例演示了如何只实现...
For example, below is the NorthwindDataContext class that is persisted based on the model we designed above: LINQ to SQL Code Examples Once we've modeled our database using the LINQ to SQL designer, we can then easily write code to work against it. Below are a few code examples that sho...
you only need to supply information in theColumnattribute if it differs from what can be deduced from your field or property declaration. In this example, you need to tell LINQ to SQL that theCustomerIDfield is part of the primary key in the table, yet you don't have to specify the ex...
因為LINQ to SQL嘗試將查詢轉譯為純關聯式 SQL 本機定義的物件類型,無法在伺服器上實際建構。 所有物件建構實際上都會延後,直到從資料庫擷取資料之後為止。 在取代實際建構函式時,產生的 SQL 會使用一般 SQL 資料行投影。 由於查詢翻譯工具無法瞭解建構函式呼叫期間發生的情況,因此無法為MyType的Name欄位建立意義...
LINQ to SQL supports stored procedures for retrieving entities, insert, update and delete operations, as you know. But you can also use them to perform lazy-loading of navigation properties. Let’s show an example of a bi-directional relationship between a Post and a Comment. We have two st...
Example 3: All rows don’t join and are not returned Below is the result if we do not use the LINQ group join. Below are the query results. Below is the corresponding SQL Server query. SELECT pfa.PetID, pt.PetTypeDesc, pfa.petname, pf.PetOwner, pf.remarks, pat.AdoptedBy...