c# generate barcode FirstName --------Poor Better Rick in Font

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LastName --------DBA DBA Dobson
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FullName -----------------Poor DBA Better DBA Rick Dobson
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The next script sample starts with an ENABLE TRIGGER statement. This statement reimposes the operation of the trStudents_Insert_Rollback trigger with its ROLLBACK statement. When the INSERT statement in the following script passes control to the trigger, the trigger rolls back the transaction
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CHAPTER 7 LEVERAGING DATABASE OBJECTS THAT ENCAPSULATE T-SQL
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and aborts the batch that is, the trigger concludes normally, but the batch invoking the trigger via an INSERT statement aborts abnormally. This is why the following code segment includes two GO keywords. The second GO keyword restarts the code after the trigger containing the ROLLBACK statement aborts the batch. The second SELECT statement confirms that no new row was added to the Students table.
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The syntax for the ROLLBACK statement is the same as in preceding versions of SQL Server however, prior versions of SQL Server did not abort a batch after a ROLLBACK statement.
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ENABLE TRIGGER trStudents_Insert_Rollback ON Students SELECT * FROM Students INSERT Students (StudentID, FirstName, LastName) VALUES (3, 'Rick', 'Dobson') GO SELECT * FROM Students GO StudentID ----------1 2 FirstName --------Poor Better LastName --------DBA DBA FullName -----------------Poor DBA Better DBA
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INSERT statement rolled back. Msg 3609, Level 16, State 1, Line 7 The transaction ended in the trigger. The batch has been aborted.
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StudentID ----------1 2
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FullName -----------------Poor DBA Better DBA
Archiving Changes to a Table with Triggers
One common application requirement is to monitor the changes to one or more tables in a database. Triggers offer a convenient vehicle for constructing this kind of solution. In the following example, you ll use two tables and three triggers. The first table is the Students table in the ProSSEAppsCh07 database. This is a resource table that gets monitored. You can replace the Students table in the sample application with any target resource table that your needs dictate. The second table is an archive table. The sample solution stores the changes to the Students table in the archive table. By reviewing the contents of the archive table, you can tell what changes were made in which order to the Students table (or any other resource table that you are monitoring with a variation of this sample). The archive table must have a pair of columns for each column in the original resource table that you are monitoring.
CHAPTER 7 LEVERAGING DATABASE OBJECTS THAT ENCAPSULATE T-SQL
One column in each pair is for the new column value in the resource table. The other column in each pair is for the original or deleted column value in the resource table. You may want several additional columns in the archive table to capture other items of interest, such as when a change occurred, what type of change was made, or which user made the change. You also need three triggers one each for the INSERT, UPDATE, and DELETE statements that operate on the resource table. The main purpose of these triggers is updating the archive table with values from the inserted and deleted tables. You can also use the triggers to enforce business rules. The INSERT trigger fires after the insertion of a new row. It transfers values from the inserted table to the archive table. The DELETE trigger fires after the deletion of a row. It also copies values to the archive table, but its source table is the deleted table. The UPDATE trigger is an INSTEAD OF trigger that copies values from the inserted and deleted tables to the archive table. In this example solution, this trigger allows changes to the FirstName and LastName column values, but it blocks changes to StudentID column values.
Setting up the Archive Solution
As mentioned previously, this sample application uses the Students table from the ProSSEAppsCh07 database as the resource table. The sample relies heavily on triggers, but it assumes that only the three triggers that follow are in the database. If you have worked on any prior samples that use the ProSSEAppsCh07 database, your current copy may have other triggers. Therefore, your first step should be to run the script in the ViewForDataModificationSampleDB.sql file. This will create a fresh copy of the ProSSEAppsCh07 database with no triggers for the Students table. The following CREATE TABLE statement defines the columns of the archive table, which has the name StudentsArchive in the sample application. The AID column serves as the table s primary key. This column has an IDENTITY property setting. The type column is an nvarchar variable with up to six characters. The values for this column are INSERT, UPDATE, or DELETE. The whenchanged column has a default value that assigns the current date and time as a smalldatetime value. The table has one column, named StudentID, for recording StudentID column values. Only one column is required for StudentID column values because a business rule prevents users from changing this column in the original resource table. The FirstName and LastName column values each have two corresponding columns in the archive table. Column names starting with the letter n are for values from the inserted table. Column names starting with the letter o are for values from the deleted table. CREATE TABLE StudentsArchive ( AID int IDENTITY(1,1) PRIMARY KEY CLUSTERED, type nvarchar(6) NOT NULL, whenchanged smalldatetime NOT NULL DEFAULT Getdate(),
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