Exercise: Use LINQ to insert, update and delete SQL Server data

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The answer to the exercise will be included and explained if you attend the Wise Owl course listed below!

Category ==> Visual C Sharp 2010  (65 exercises)
Topic ==> Writing LINQ to SQL  (2 exercises)
Level ==> Harder than average
Course ==> Adv C# | Classes & LINQ
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If you haven't already done so, in SQL Server Management Studio open and run the script in the above folder to generate the Books database.  Still in SQL Server Management Studio, add two new integer columns to the tblAuthor table:

Adding 2 columns

To do this, right-click on the table and go into design view for it. If you're not sure how to do this, ask your trainer!

 

Create a simple data model for this called LiteraryThings using a LINQ to SQL Classes object and the O/R Designer:

Books data model

Drag these two tables in from Server Explorer (you'll need to have created a connection first).

 

In a new form called frmChangingThings, write as many of the following chunks of code as you have time for!

Firstly, write code to update the two extra columns you've added to the tblAuthor table:

The two new columns

Column 4 is the length of the author's first name plus last name (plus 1 to allow for a space).

 

Now write code to add in Alexandra Fuller and Barbara Kingsolver as two new authors (don't worry about their AuthorId property, as this will be set automatically in SQL Server):

Adding 2 authors

The author quality is looking up!

 

Finally, delete The Kraken Wakes from the books table (it wasn't John Wyndham's finest):

Book deleted

After running this code, The Kraken Wakes has been deleted.

 

Note from exercise author: LINQ to SQL  - where have you been all my life?

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