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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.

A transaction is a sequence of one or more SQL statements that together form a logical unit of work. The SQL statements that form the transaction are typically closely related and perform interdependent actions. Each statement in the transaction performs some part of a task, but all of them are required to complete the task. Grouping the statements as a single transaction tells the DBMS that the entire statement sequence should be

Data retrieval with dynamic SQL (continued)

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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.

Part V:

19:

for (i = 0; i < colcount; I++) { qry_var = qry_da->sqlvar + I; free(qry_var->sqldata); free(qry_var->sqlind); } free(qry_da); close qrycurs; exit(); }

Figure 19-1.

FIGURE 18-9

A SQL API is often used when the application program and the database are on two different systems in a client/server architecture, as shown in Figure 19-2. In this configuration, the code for the API functions is located on the client system, where the application program executes. The DBMS software is located on the server system, where the database resides. Calls from the application program to the API take place locally within the client system, and the API code translates the calls into messages that it sends to and receives from the DBMS over a network. A SQL API offers particular advantages for a client/server architecture because it can minimize the amount of network traffic between the API and the DBMS. The early APIs offered by various DBMS products differed substantially from one another. Like many parts of the SQL language, proprietary SQL APIs proliferated long before there was an attempt to standardize them. In addition, SQL APIs tend to expose the underlying capabilities of the DBMS more than the embedded SQL approach,

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Data retrieval with dynamic SQL (continued)

Figure 19-2.

The SQLDA is a variable-length structure with an array of one or more SQLVAR structures, as described earlier in the section EXECUTE with SQLDA, and shown in Figure 18-7 Before passing the SQLDA to the DESCRIBE statement, your program must fill in the SQLN field in the SQLDA header, telling the DBMS how large the SQLVAR array is in this particular SQLDA As the first step of its DESCRIBE processing, the DBMS fills in the SQLD field in the SQLDA header with the number of columns of query results If the size of the SQLVAR array (as specified by the SQLN field) is too small to hold all of the column descriptions, the DBMS does not fill in the remainder of the SQLDA Otherwise, the DBMS fills in one SQLVAR structure for each column of query results, in left-to-right order.

leading to even more differences. Nonetheless, all of the SQL APIs available in commercial SQL products are based on the same fundamental concepts illustrated in Figures 19-1 and 19-2. These concepts also apply to the ODBC API and more recent ANSI/ISO standards based on it.

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