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figure are actually those used by the IBM mainframe databases (DB2 and SQL/DS), but all products that support embedded SQL use a similar process: 1. The embedded SQL source program is submitted to the SQL precompiler, a programming tool. The precompiler scans the program, finds the embedded SQL statements, and processes them. A different precompiler is required for each programming language supported by the DBMS. Commercial SQL products typically offer precompilers for one or more languages, including C, Pascal, COBOL, FORTRAN, Ada, PL/I, RPG, and various assembly languages. 2. The precompiler produces two files as its output. The first file is the source program, stripped of its embedded SQL statements. In their place, the precompiler substitutes calls to the private DBMS routines that provide the runtime link between the program and the DBMS. Typically, the names and calling sequences of these routines are known only to the precompiler and the DBMS; they are not a public interface to the DBMS. The second file is a copy of all the embedded SQL statements used in the program. This file is sometimes called a database request module (DBRM). 3. The source file output from the precompiler is submitted to the standard compiler for the host programming language (such as a C or COBOL compiler). The compiler processes the source code and produces object code as its output. Note that this step has nothing in particular to do with the DBMS or with SQL.

As the program in Figure 17-23 illustrates, an embedded SQL cursor behaves much like a filename or file handle in a programming language such as C or COBOL. Just as a program opens a file to access the file s contents, it opens a cursor to gain access to the query results. Similarly, the program closes a file to end its access and closes a cursor to end access to the query results. Finally, just as a file handle keeps track of the program s current position within an open file, a cursor keeps track of the program s current position within the query results. These parallels between file input/output and SQL cursors make the cursor concept relatively easy for application programmers to understand. Despite the parallels between files and cursors, there are also some differences. Opening a SQL cursor usually involves much more overhead than opening a file, because opening the cursor actually causes the DBMS to begin carrying out the associated query. In addition, SQL cursors support only sequential motion through the query results, like sequential file processing. In most current SQL implementations, there is no cursor analog to the random access provided to the individual records of a file. Cursors provide a great deal of flexibility for processing queries in an embedded SQL program. By declaring and opening multiple cursors, the program can process several sets of query results in parallel. For example, the program might retrieve some rows of query results, display them on the screen for its user, and then respond to a user s request for more detailed data by launching a second query. The following sections describe in detail the four embedded SQL statements that define and manipulate cursors.

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Part V:

The DECLARE CURSOR statement, shown in Figure 17-24, defines a query to be performed. The statement also associates a cursor name with the query. The cursor name must be a valid SQL identifier. It is used to identify the query and its results in other embedded SQL statements. The cursor name is specifically not a host language variable; it is declared by the DECLARE CURSOR statement, not in a host language declaration. The SELECT statement in the DECLARE CURSOR statement defines the query associated with the cursor. The SELECT statement can be any valid interactive SQL SELECT statement, as described in s 6 through 9. In particular, the SELECT statement must include a FROM clause and may optionally include WHERE, GROUP BY, HAVING, and ORDER BY clauses. The SELECT statement may also include the UNION operator, as described in 6. Thus, an embedded SQL query can use any of the query capabilities that are available in the interactive SQL language.

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