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This chapter summarizes programming requirements for using categories of API functions in database applications, and provides cross-references to more detailed information in later chapters.
All API applications must use certain API functions and support structures. For example, all applications connect to at least one database, and run at least one transaction. All applications, therefore, must declare and initialize database handles and transaction handles. They may also need to declare and populate database parameter buffers (DPBs), transaction parameter buffers (TPBs), and service parameter buffers (SPBs). This chapter outlines those requirements, and points you to more detailed information later in this book.
Some API applications may use specific API functions, such as the functions that permit an application to process dynamic SQL (DSQL) statements. These applications have additional requirements that are also outlined in this chapter along with pointers to more detailed information elsewhere in this book.