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n addition to its role as an interactive data access language, SQL supports database access by application programs. s 17 19 describe the special SQL features and techniques that apply to programmatic SQL. 17 describes embedded SQL, the oldest programmatic SQL technique, and one still supported by many SQL products. Dynamic SQL, an advanced form of embedded SQL that is used to build general-purpose database tools, is described in 18. 19 describes an alternative to embedded SQL the function call interface provided by several popular DBMS products, which has been gaining in popularity.

include sqlca; begin declare section; repnum; repname[16]; repquota; repsales; repquota_ind; end declare section;

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QL is a dual-mode language. It is both an interactive database language used for ad hoc queries and updates, and a programmatic database language used by application programs for database access. For the most part, the SQL language is identical in both modes. The dual-mode nature of SQL has several advantages: It is relatively easy for programmers to learn how to write programs that access the database. Capabilities available through the interactive query language are also automatically available to application programs. The SQL statements to be used in a program can be tried first using interactive SQL and then can be coded into the program. Programs can work with tables of data and query results instead of navigating their way through the database. This chapter summarizes the types of programmatic SQL offered by the leading SQL-based products and then describes the programmatic SQL used by the IBM SQL products, which is called embedded SQL.

/* /* /* /* /*

SQL is a language and can be used programmatically, but it would be incorrect to call SQL a programming language. SQL lacks even the most primitive features of real programming languages. It has no provision for declaring variables, no GOTO statement, no IF statement for testing conditions, no FOR, DO, or WHILE statements to construct loops, no block structure, and so on. SQL is a database sublanguage that handles special-purpose database management tasks. To write a program that accesses a database, you must start with a conventional programming language such as COBOL, PL/I, FORTRAN, Pascal, C, C++, or Java, or a scripting language such as Perl, PHP, or Ruby, and then add SQL to the program.

1997 1997 1998

employee number (from user) */ retrieved salesperson name */ retrieved quota */ retrieved sales */ null quota indicator */

Part V:

The initial ANSI/ISO SQL standard was concerned exclusively with this programmatic use of SQL In fact, the standard did not even include the interactive SELECT statement described in s 6 through 9 It only specified the programmatic SELECT statement described later, in the section Data Retrieval in Embedded SQL The SQL2 standard, published in 1992, expanded its focus to include interactive SQL (called direct invocation of SQL in the standard) and more advanced forms of programmatic SQL (the dynamic SQL capabilities described in 18) Commercial SQL database vendors offer two basic techniques for using SQL within an application program: Embedded SQL In this approach, SQL statements are embedded directly into the program s source code, intermixed with the other programming language statements Special embedded SQL statements are used to retrieve data into the program.

/* Prompt the user for the employee number */ printf("Enter salesrep number: "); scanf("%d", &repnum); /* Execute the SQL query */ exec sql select name, quota, sales from salesreps where empl_num = :repnum into :repname, :repquota, :repquota_ind, :repsales; /* Display the retrieved data */ if (sqlca.sqlcode = = 0) { printf("Name: %s\n", repname); if (repquota_ind < 0) printf("quota is NULL\n"); else printf("Quota: %f\n", repquota); printf("Sales: %f\n", repsales); } else if (sqlca.sqlcode = = 100) printf("No salesperson with that employee number.\n"); else printf("SQL error: %ld\n", sqlca.sqlcode); exit();

A special SQL precompiler accepts the combined source code and, along with other programming tools, converts it into an executable program Application program interface In this approach, the program communicates with the DBMS through a set of function calls called an application program interface (API) The program passes SQL statements to the DBMS through the API calls and uses API calls to retrieve query results This approach does not require a special precompiler The initial IBM SQL products used an embedded SQL approach, and most commercial SQL products adopted it in the 1980s The original ANSI/ISO SQL standard specified only an awkward module language for programmatic SQL, but commercial SQL products continued to follow the IBM de facto standard.

Figure 17-21.

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