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Triggers can be implemented to replace all other constraints on a table. A typical example is the use of a trigger to replace the functionality enforced by a foreign key constraint. It is possible to implement cascading deletes using triggers. For example, if we do not have a foreign key between the Inventory and InventoryProperty tables, we might implement a trigger to monitor the deletion of Inventory records and to delete all associated InventoryProperty records. Check and default constraints are limited in that they can base their decision only on the context of current records in the current tables. You can implement a trigger that will function in a manner similar to check constraints that bases its verification on the contents of multiple records or even on the contents of other tables. Triggers can be set to create an audit trail of activities performed on a table. For example, we might be interested in obtaining information on who changed the contents or specific columns in the Lease table, and when that user made the changes. It is possible to create a trigger to notify the administrator when a specific event occurs in the database. For example, in a service database, we might send e-mail to a person responsible for dispatching technical staff informing that person that a request for technical support has been received in the database. In certain inventory systems, we might automatically generate an order if the quantity of a selected type of equipment or spare part falls below a specified level. Triggers are suitable for computing and storing calculated columns, running totals, and other aggregations in the database. For example, to speed up reporting, you might decide to keep a total of ordered items in an order table.

Testing an installation of Microsoft SQL Server is perhaps the most overlooked step in successful administration. This is partly due to the fact that Microsoft has created a very thorough Setup Utility, and partly due to the human tendency to assume that we did it correctly. In the real world, some of the most common problems within SQL Server are caused by incorrect settings at the time of install. You should therefore always take the time to test any installation of SQL Server, and additionally perform some of the test procedures that we cover here. Now that you have ensured that the SQL Server files have been installed where you want them to be and that the SQL Server services are installed using the proper type of account, you will want to connect to the SQL Server. For a Typical installation, you will want to connect to SQL Server in a couple of ways. This will test management tools as well as the SQL Server itself. First connect using SQL Enterprise Manager and register your server name. For the purpose of this discussion, assume you are using Windows NT Authentication. If you

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9:

Usually, referential integrity between two tables is implemented with a foreign key. In the following illustration, you can see two tables that are linked in such a manner:

In such cases, a foreign key will prevent the user from deleting records from a referenced table (Inventory) if a record is referenced in a linked table (InventoryProperty). The only way to delete the record would be to use the following code:

Figure 12-13.

----------- ---1 1 (1 row(s) affected)

After the virtual directory is created, an end user can use a browser such as Internet Explorer 5.0 to query the database using HTTP GET and POST methods. The simplest syntax for making such queries would be:

Unfortunately, characters such as (space), , / , % , # , and & have special meanings in URL syntax. Therefore, they must be encoded using their hexadecimal value in the form %xx . For example, the space character can be replaced using %20 or + . Therefore, to query the Inventory table, a user can issue the following statement:

12:

The query returns an XML document that contains just one node (see Figure 12-14). If you leave the clause top 1 out of the query,

the parser will not be able to process the result. The Inventory element in the result string is repeated for each record and there is, therefore, no unique top element (see Figure 12-15).

In different versions of SQL Server, triggers react differently in rollback transaction statements. When a trigger is rolled back in SQL Server 7.0 or SQL Server 2000, the complete batch that initiated the trigger fails and the execution continues from the first statement of the next batch. Version 4.2 behaves in a similar manner. In version 6.0, processing continues in the trigger, but the batch is canceled. In version 6.5, the processing continues in both the trigger and the batch. It was the responsibility of the developer to detect errors and cascade out of the process (in other words, go out of all nested procedures and triggers).

Figure 12-14.

Figure 12-15.

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