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When you embed SQL statements into your host language, you should provide a way to take specific actions if you receive error or warning messages when you try to access data. SQL provides a relatively straightforward method that you can use to monitor errors and warnings and take actions depending on the results of that monitoring. By embedding WHENEVER statements in your host language, you can provide your program with an effective level of error handling that works alongside your other embedded statements. The WHENEVER statement includes two sets of options, as shown in the following syntax: WHENEVER { SQLEXCEPTION | SQLWARNING | NOT FOUND } { CONTINUE | GOTO <target> } As you can see, you must first specify the WHENEVER keyword and then specify the necessary options. The first set of options indicates the condition to which the WHENEVER statement applies. If that condition is met, a specified action is taken. A WHENEVER statement can include one of three conditions:

In Transact-SQL (Microsoft SQL Server and Sybase), memory used by a cursor is not completely freed up when the cursor is closed, so it is also good programming practice to deallocate the cursor as shown in this example:

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There are many ways to make your corporate policies known. Some organizations actually include this information with the typical human resources paperwork that employees must complete before joining with a company. It is important that users are aware of the very real dangers of losing data. Remind users periodically that losing all the information on their hard drives could cause a lot of unnecessary work. Once you come up with your backup strategy, it s important to make sure that all who are affected by it are aware of the limitations. Users should know, for example, whether or not their local workstations are being backed up. If so, they should know how often this might occur. If not, they should be given proper procedures. Users should be made aware that protecting information is everyone s responsibility. Just as they would lock filing cabinets in which sensitive information resides, they should be aware of several other policies: w Passwords should not be easy to find. Users should not write their passwords on sticky notes and store them on their monitors or under their keyboards. Passwords should not be easy to guess. By far, the most common method of security in current networked environments involves usernames and passwords. If not properly instructed otherwise, users will often choose passwords that are easy to guess. If I were trying to guess a password, I would start by using personal names the names of family members or pets. Password-cracking utilities do the same thing, using dictionary-based algorithms. Proprietary data belongs to the company. Users should be made aware that information stored on company resources is the property of the organization, not the individual who created it. Based on this, IT departments have the right to manage the information as they see fit.

SQLEXCEPTION The condition is met whenever an SQL statement generates an exception. For example, an exception might be generated when you try to insert invalid data into a column. SQLWARNING The condition is met whenever an SQL statement generates a warning. For example, a statement might generate a warning if a number has been rounded off. NOT FOUND The condition is met whenever a SELECT statement cannot return data in its query results. This can apply to a singleton SELECT statement or to a FETCH statement at the end of the cursor s result set.

Once you specify a condition in your WHENEVER statement, you must specify an action. The WHENEVER statement supports two actions:

There are many ways to publicize policies. Perhaps the most traditional (and potentially inefficient) is the standard method of handing out procedure handbooks to employees. There are probably better ways, though. Posting information on the company s intranet and sending occasional reminders to users can also be very helpful, as long as the information is maintained and revised as necessary. Better yet, if time permits, hands-on classes that end with users signing acknowledgement sheets can ensure that the information is conveyed effectively.

DEALLOCATE overdue_rentals;

GOTO <target> The program will jump to a section within the host language that is named in the <target> placeholder.

Now that we ve looked at the options available in the WHENEVER statement, let s take a look at an example. Suppose that you want your SQL statements to go to a certain part of the

2:

program if an error occurs. In the following WHENEVER statement, an exception will cause the program to move to the Error1 section:

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