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The program places the address of the data area and the address of the indicator variable into the SQLDA to tell the DBMS where to return the query results 6 A dynamic version of the OPEN statement asks the DBMS to start executing the query and passes values for the parameters specified in the dynamic SELECT statement The OPEN statement positions the cursor before the first row of query results 7 A dynamic version of the FETCH statement advances the cursor to the first row of query results and retrieves the data into the program s data areas and indicator variables Unlike the static FETCH statement, which specifies a list of host variables to receive the data, the dynamic FETCH statement uses the SQLDA to tell the DBMS where to return the data.

/* Declare the cursor for the query */ exec sql declare repcurs cursor for select name, quota, sales from salesreps where sales > quota order by name; /* Set up error processing */ whenever sqlerror goto error; whenever not found goto done; /* Open the cursor to start the query */ exec sql open repcurs; /* Loop through each row of query results */ for (;;){

Subsequent FETCH statements move through the query results row by row, advancing the cursor to the next row of query results and retrieving its data into the program s data areas 8 The CLOSE statement ends access to the query results and breaks the association between the cursor and the query results This CLOSE statement is identical to the static SQL CLOSE statement; no extensions are required for dynamic queries..

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/* Fetch the next row of query results */ exec sql fetch repcurs 3 into :repname, :repquota, :repquota_ind, :repsales; /*Display the retrieved data */ 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); } error: printf("SQL error: %ld\n", sqlca.sqlcode); exit(); done: /* Query complete; close the cursor */ exec sql close repcurs; exit(); }

Summary

FIGURE 17-23

00) UPDATE SALESREPS SET REP_OFFICE = 14 WHERE EMPL_NUM = 115 As the example shows, there are times when it would be convenient if the referential integrity constraint were not checked until after a series of interrelated updates are performed Unfortunately, this type of complex "deferred checking" is not provided by most current SQL implementations Some deferred checking capabilities are specified by the SQL2 standard, as described later in this chapter Referential cycles also restrict the delete and update rules that can be specified for the relationships that form the cycle Consider the three tables in the referential cycle shown in Figure 11-6 The PETS table shows three pets and the boys they like, the GIRLS table shows three girls and the pets they like, and the BOYS table shows four boys and the girls they like, forming a referential cycle.

This chapter described the development of SQL and its role as a standard language for relational database management: I SQL was originally developed by IBM researchers, and IBM s strong support of SQL is a key reason for its success. I There are official ANSI/ISO SQL standards and several other SQL standards, each slightly different from the ANSI/ISO standards. I Despite the existence of standards, there are many small variations among commercial SQL dialects; no two SQLs are exactly the same. I SQL has become the standard database management language across a broad range of computer systems and applications areas, including mainframes, workstations, personal computers, OLTP systems, client/server systems, data warehousing, and the Internet.

Part V:

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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