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Microsoft Visual Studio 2010: A Beginner s Guide
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Dim myShop As New MyShopDataContext Dim customers As IEnumerable = myShopGetCustomers() For Each custOrd In customers ConsoleWriteLine("Name: " & custOrdName) Next
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Name: Meg Name: Joe Name: May
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Just call myShopGetCustomers and you ll receive a collection of Customer objects There are many more advanced scenarios that you can handle with LINQ, but this is just a beginner s guide However, you now have a solid base of query techniques that will get you started In addition to querying a database, you ll need to perform insert operations, which is next
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LINQ to SQL generates SQL (Structured Query Language) statements to send to the database for your queries If you would like to see the generated SQL, set a breakpoint on the line after the query and run the program with debugging When you hit the breakpoint, hover over the variable holding query results and you ll see the SQL statement
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Inserting Data with LINQ to SQL
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To insert a new record into a table, you ll need to create an instance of the LINQ to SQL class for that table, call a method to insert, and then call another method to commit the changes The following example shows how to add a new record to the Customer table: C#:
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private static int InsertCustomer() { var cust = new Customer { Name = "Jim" }; var myShop = new MyShopDataContext(); myShopCustomersInsertOnSubmit(cust); myShopSubmitChanges(); return custCustomerID; }
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7: Working with Data
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Function InsertCustomer() As Integer Dim cust = New Customer With { Name = "Jim" } Dim myShop As New MyShopDataContext myShopCustomersInsertOnSubmit(cust) myShopSubmitChanges() Return custCustomerID End Function
As shown here, each collection property, such as Customers, has an InsertOnSubmit method that takes an object of the collection s type, Customer in this case Don t forget to call SubmitChanges, or else you won t see any changes to your data The next section discusses updates Once the insert executes, with SubmitChanges, the new object, cust, will be updated with the new CustomerID, which you read and return to calling code
Updating Data with LINQ to SQL
To update data, you need to get an object for the record you want to update, change the object you received, and then save the changes back to the database The following example shows how to update a record: C#:
private static void UpdateCustomer(int custID) { var myShop = new MyShopDataContext(); var customers = from cust in myShopCustomers where custCustomerID == custID select cust; Customer firstCust = customersSingleOrDefault(); if (firstCust != null) { firstCustName = "James"; } myShopSubmitChanges(); }
Microsoft Visual Studio 2010: A Beginner s Guide
Sub UpdateCustomer(ByVal custID As Integer) Dim myShop As New MyShopDataContext Dim customers = From cust In myShopCustomers Where custCustomerID = custID Select cust Dim firstCust As Customer = customersSingleOrDefault() If (firstCust IsNot Nothing) Then firstCustName = "James" End If myShopSubmitChanges() End Sub
In the previous queries for the customer whose name was Jim, change the object to James and saves changes The call to SingleOrDefault was necessary because the result of a LINQ to SQL query is a collection, but we only want the first or only record returned There is also an operator method named Single, but using SingleOrDefault is favorable because it returns a default value if no records are returned, whereas Single will throw an exception The code uses an if statement to protect against the possibility of an exception; otherwise, the code would throw a NullReferenceException when firstCust is null (Nothing in VB) and the code tries to access the Name property of a null object Remember to call SubmitChanges; otherwise the updates won t be made You can now query, insert, and update Your final skill to learn is deleting data
Deleting Data with LINQ to SQL
To delete a record from the database, you get a reference to the object for that record, call a method to delete that object, and save changes Here s an example that deletes a record: C#:
private static void DeleteCustomer(int custID) { var myShop = new MyShopDataContext(); var customers = from cust in myShopCustomers where custCustomerID == custID select cust;
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