By Jason Lefebvre
ADO.NET is the knowledge entry version outfitted into the .NET Framework. It replaces the outdated (and mostly winning) ADO utilized in just about all visible easy and ASP purposes outfitted during the last few years. ADO.NET allows an software to speak with any OLE database resource (including Oracle, Sybase, Microsoft entry, or even textual content files). This e-book will current ADO.NET in an easy, effortless -to-learn demeanour packed with many code examples and workouts. A reader with out earlier wisdom of ADO.NET may be in a position to learn this ebook and feature a sensible wisdom of latest item version permitting them to retrieve and paintings with facts from a number of info resources
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Example text
So, if the first customer has a CustomerID of 0, any rows in the Orders table that have a CustomerID of 0 are returned. 6. NET code is provided. com. 6 builds a DataSet with two DataTables, creates a relationship between those two tables, and then steps through each row of the parent DataTable displaying each child row in the child table. In this case, the code will display a list of employees (the parent DataTable) and a list of the projects each employee is assigned to (the child DataTable). 6 is the code with a grey background.
4. 4. When you are done, right-click on the grey box to the left of the AwardID column. Select Set Primary Key. A primary key must be present in both tables participating in a relationship. 4 Creating a new database table inside the diagram utility. Adding Relationships to Datasets 43 5. Next, click and drag the box to the left of the EmployeeID column of the Employees table and drag it on top of the EmployeeID column of the EmployeeAwards table. 5. 5 After dragging and dropping the new relationship, you are presented with the Create Relationship screen.
GetChildRows(“CustomerOrders”) For the customer in the first row of the Customer DataTable, the preceding code returns any orders they have listed in the Orders table. It does this by using the CustomerOrders DataRelation name passed to it as its only argument. So, if the first customer has a CustomerID of 0, any rows in the Orders table that have a CustomerID of 0 are returned. 6. NET code is provided. com. 6 builds a DataSet with two DataTables, creates a relationship between those two tables, and then steps through each row of the parent DataTable displaying each child row in the child table.