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There are two version stores within each instance of SQL Server. This is an advanced topic, and we don t cover it, but in essence, one version store holds versions of each row of data where you have online index build operations on them, and the other index store is for rows of data where you don t have online index build operations. These exist to reduce the amount of I/O on the transaction log.
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To check what columns have been modified, it would be possible to compare each and every column value between the two tables to see what information had been altered. Luckily, as was discussed when we examined the syntax, there is a function, UPDATE(), that can test whether a column has been modified. Now that you are fully up to date as to what a DML trigger is and how it works, it is time to create and test the first trigger within the database.
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Creating a DML FOR Trigger
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The first trigger we will be looking at is a DML trigger to work with a customer record when a transaction occurs. The following example will demonstrate how to create a trigger on a data insertion, but also what happens to that INSERT when there is a problem in the trigger itself. As we are near the end of the book, our T-SQL within the trigger will be more advanced than some of the code so far.
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CHAPTER 13 TRIGGE RS
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Try It Out: Creating a Trigger in Query Editor
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The purpose of our example is to change a customer s account balance when a financial transaction occurs as defined by an INSERT in the TransactionDetails.Transactions table. We want to change the balance AFTER the row has been inserted into the TransactionDetails.Transactions table. This is so we do not change the customer s account balance if later in the INSERT of the row a problem occurs and the INSERT does not complete. 1. Ensure that Query Editor is running and that you are logged in with an ID that can insert objects into the database. First of all, it is necessary to give the trigger a meaningful name. Then you define the table that the trigger will be attached to, which in this case is the TransactionDetails.Transactions table. The final part of the start of the trigger will then define the type of trigger and on what actions the trigger will execute. This will be a FOR AFTER trigger on an INSERT on the TransactionDetails.Transactions table. The first part of the code looks as follows: USE ApressFinancial GO CREATE TRIGGER TransactionDetails.trgInsTransactions ON TransactionDetails.Transactions AFTER INSERT AS 2. It is now time to enter the remainder of the code for the trigger. We need to retrieve the Amount and TransactionType from the INSERTED table to be able to use these in the update of the CustomerDetails. Customers table. We can JOIN from the INSERTED table to the TransactionDetails.TransactionTypes table to find out whether we are dealing with a credit or a debit transaction. If it is a debit, then through the use of a subquery and a CASE statement we can alter the Amount by multiplying it by -1 so that we are reducing a customer s balance. Notice the subquery includes a WHERE statement so that if we are entering a transaction type that does not affect the cash balance, such as recording a share movement, then the ClearedBalance will not be altered. The final action is to update the customer s balance, which we will do via an UPDATE statement. There is a great deal to take in, so take time over the code. Also, the two examples of running this trigger should clear up any queries you will have.
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