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It is now necessary to enter a few more customers so that a reasonable amount of data is contained within the CustomerDetails.Customers table to work with later in the book. We need to do the same with several other tables as well, such as TransactionDetails.TransactionTypes, CustomerDetails. CustomerTransactions, and so on. This section will prove that no extra or specialized processing is required when inserting several records. When working with data, there may be many times that several records of data are inserted at the same time. This could be when initially populate a table or when testing. In this sort of situation where you are repopulating a table, it is possible to save your query to a text file, which can then be reopened in Query Editor and executed without having to reenter the code. This is demonstrated at the end of the upcoming example.

You can delete all rows that match a given condition with the delete_all class method. The following will delete all events before a certain date.

This next example will demonstrate inserting several records. The work will be completed in batches. There is no transaction processing surrounding these INSERTs, and therefore each insertion will be treated as a single unit of work, which either completes or fails.

Caution If you use delete without any arguments, it will delete all rows in the table, so be careful! Most

As you can see, once you get used to working with Expression Blend, it can save you quite a bit of typing. This will make laying out your applications a much faster and easier task.

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Note A transaction allows a number of INSERTs or modifications to be treated as one unit, and if any insertion fails within the transaction, all the units will be returned back to their original value, and no insertions will take place. Transactions will be discussed in more detail in the upcoming Transactions section.

So far, we ve been very nice to our models and have been making them happy by providing them with just the information that they need. But we know that in the previous chapter, we provided validations that were preventing us from saving bad records to the database. Specifically, we told the Event model that it should never allow itself to be saved to the database if it isn t provided a title and location. Taking a look at the Event model, shown in Listing 4-1, you can recall how validations are specified.

1. Ensure that SQL Server Query Editor is up and running. In the Query Editor window, enter the following code. In this example, several customers will be added through only one INSERT statement. INSERT INTO CustomerDetails.Customers (CustomerTitleId,CustomerFirstName,CustomerOtherInitials, CustomerLastName,AddressId,AccountNumber,AccountType, ClearedBalance,UnclearedBalance) VALUES (3,'Bernie','I','McGee',314,65368765,1,6653.11,0.00), (2,'Julie','A','Dewson',2134,81625422,1,53.32,-12.21), (1,'Kirsty',NULL,'Hull',4312,96565334,1,1266.00,10.32) 2. Now just execute the code in the usual way. You will see the following output in the results pane. This indicates that three rows of information have been inserted into the database, one at a time.

You may have noticed in our generated scaffolding that we use a helper method called error_messages_for(:event) to print out a helpful little error message. That helper isn t black magic; it s simply a bit of code that asks the model for its list of errors (also referred to as the errors collection), and returns a nicely formatted block of HTML to show the user.

Summary

(3 row(s) affected)

Note You may have noticed that we call methods in Ruby with the dot (.) For instance, we would say

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