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I The EXECUTE statement asks the DBMS to execute a dynamic statement previously compiled by a PREPARE statement. It also supplies parameter values for the statement that is to be executed. I The DESCRIBE statement returns a description of a previously prepared dynamic statement into a SQLDA. If the dynamic statement is a query, the description includes a description of each column of query results. I The DECLARE CURSOR statement for a dynamic query specifies the query by the statement name assigned to it when it was compiled by the PREPARE statement. I The OPEN statement for a dynamic query passes parameter values for the dynamic SELECT statement and requests query execution. I The FETCH statement for a dynamic query fetches a row of query results into program data areas specified by a SQLDA structure. I The CLOSE statement for a dynamic query ends access to the query results.
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he embedded SQL technique for programmatic access to SQL-based databases was pioneered by the early IBM relational database prototypes and was widely adopted by mainstream SQL products. However, several major DBMS products, led by Sybase s first SQL Server implementation, took a very different approach. Instead of trying to blend SQL with another programming language, these products provide a library of function calls as an application programming interface (API) for the DBMS. To pass SQL statements to the DBMS, an application program calls functions in the API, and it calls other functions to retrieve query results and status information from the DBMS. For many programmers, a SQL API is a very straightforward way to use SQL. Most programmers have some experience in using function libraries for other purposes, such as string manipulation, mathematical functions, file input/output, and screen forms management. Modern operating systems, such as UNIX and Windows, extensively use API suites to extend the core capabilities provided by the OS itself. The SQL API thus becomes just another library for the programmer to learn. Over the last several years, SQL APIs have become very popular, equaling if not surpassing the popularity of the embedded SQL approach for new applications development. This chapter describes the general concepts used by all SQL API interfaces. It also describes specific features of some of the proprietary APIs used by popular SQL-based DBMS systems, and both the ANSI/ISO SQL Call-Level Interface standard and Microsoft s Open Database Connectivity (ODBC) standard on which it is based. Finally, it describes JDBC, which is the API standard for SQL access from programs written in Java, and is used by all of the popular Internet application servers.
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When a DBMS supports a function call interface, an application program communicates with the DBMS exclusively through a set of calls that are collectively known as an application programming interface, or API. The basic operation of a typical DBMS API is illustrated in Figure 19-1. I The program begins its database access with one or more API calls that connect the program to the DBMS and often to a specific database. I To send a SQL statement to the DBMS, the program builds the statement as a text string in a buffer and then makes an API call to pass the buffer contents to the DBMS. I The program makes API calls to check the status of its DBMS request and to handle errors. I If the request is a query, the program uses API calls to retrieve the query results into the program s buffers. Typically, the calls return data a row at a time or a column at a time. I The program ends its database access with an API call that disconnects it from the DBMS.
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