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Now that you have seen how applications handle database query result sets using cursors, you need to understand how the application connects to and interacts with the database. Most connections between an application and database use a standard API. An API (application programming interface) is a set of calling conventions by which an application program accesses services. Such services can be provided by the operating system or by other software products such as the DBMS. The API provides a level of abstraction that allows the application to be portable across various operating systems and vendors.

EXEC SQL WHENEVER SQLEXCEPTION GOTO Error1;

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For many users, the functions and responsibilities of IT are enigmatic. A typical workstation user is not interested in the routers and servers that must be working in order for them to do their jobs. That s one reason that IT-related problems can be so frustrating. By keeping users informed, you can avoid surprises and prevent many calls to the help desk. You will also give those who are affected by IT s actions time to make alternate plans. These simple practices can improve your users customer service experiences, and thus help improve their perception of your IT department. When problems occur, our reflex is to correct it. Often, we hope that nobody is adversely affected, and handle any issues through the help desk. While this is certainly one approach, it is much better to notify users of unplanned downtime after it occurs and to keep them informed of any issues related to incomplete backups. By doing this, you can avoid having to make excuses later.

Notice that the SQLEXCEPTION option and the GOTO option are specified in this statement. The SQLEXCEPTION option tells the program to take a specified action if an SQL statement generates an exception. The GOTO option defines the action that should be taken. In this case, the option specifies that the program should move to the Error1 section of the host language. A WHENEVER statement applies to the embedded SQL statements that follow it. You can embed as many WHENEVER statements in your host language as necessary. The last statement to appear is the one that is applied to the other statements.

Managing security and user permissions can often be a touchy subject for all who are involved. Employees may feel that they are not trusted if you limit their user access permissions. Explaining the real reasons for limiting permissions protecting accidental or malicious data loss can sometimes be the cure. However, there will still be political barriers. Creating new user accounts and changing passwords are permissions given to administrators by default, and they will undoubtedly create test accounts that may have weak passwords. Restricting permissions to only those who are needed to complete job functions can help prevent sloppy security implementations.

ODBC (Open Database Connectivity) is a standard API for connecting application programs to DBMSs. ODBC is based on a Call Level Interface (CLI, a convention that de nes the way calls to services are made), which was rst de ned by the SQL Access Group and released in September 1992. Although Microsoft was the rst company to release a commercial product based on ODBC, it is not a Microsoft standard, and in fact there are now versions available for Unix, Macintosh, and other platforms. ODBC is independent of any particular language, operating system, or database system. An application written to the ODBC API can be ported to another database or operating system merely by changing the ODBC driver. It is the ODBC driver that binds the API to the particular database and platform, and a de nition known as the ODBC data source contains the information necessary for a particular application to connect with a database service. On Windows systems, the most popular ODBC drivers are shipped with the operating system, as is a utility program to de ne ODBC data sources (found on the Control Panel or Administrative Tools Panel, depending on the version of Windows). Most commercial software products and most commercial databases support ODBC, which makes it far easier for software vendors to market and support products across a wide variety of database systems. One notable exception is applications

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