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strcpy(stmtbuf, "select "); /* Set up error processing */ exec sql whenever sqlerror goto handle_error; exec sql whenever not found goto no_more_columns;

a cursor previously opened by an OPEN statement. The CLOSE statement can be executed at any time after the cursor has been opened. In particular, it is not necessary to FETCH all rows of query results before closing the cursor, although this will usually be the case. All cursors are automatically closed at the end of a transaction. Once a cursor is closed, its query results are no longer available to the application program.

Unlike primary keys, foreign keys in a relational database are allowed to contain NULL values. In the sample database the foreign key REP_OFFICE, in the SALESREPS table, permits NULL values. In fact, this column does contain a NULL value in Tom Snyder's

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/* Query the system catalog to get column names for the table */ exec sql open tblcurs; for ( ; ; ) { /* Get name of next column and prompt the user */ exec sql feth tblcurs into :querycol; printf("Include column %s (y/n) ", querycol); gets(inbuf); if (inbuf[0] == 'y') { /* User wants the column; add it to the select list */ if (colcount++ > 0) strcat(stmtbuf, ", "); strcat(stmtbuf, querycol); } } no_more_columns: exec sql close tblcurs; /* Finish the SELECT statement with a FROM clause */ strcat(stmtbuf, "from "); strcat(stmtbuf, querytbl); /* Allocate SQLDA for the dynamic query */ query_da = (SQLDA *)malloc(sizeof(SQLDA) + colcount * sizeof(SQLVAR)); query_da->sqln = colcount; /* Prepare the query and ask the DBMS to describe it */ exec sql prepare querystmt from :stmtbuf; exec sql describe querystmt into qry_da; /* Loop through SQLVARs, allocating memory for each column */ for (i = 0; i < colcount; i++) { qry_var = qry_da->sqlvar + i; qry_var->sqldat = malloc(qry_var->sqllen); qry_var->sqlind = malloc(sizeof(short)); } /* SQLDA is all set; do the query and retrieve the results! */

The SQL1 standard specifies that a cursor can only move forward through the query results. For a number of years, most commercial SQL products also supported only this form of forward, sequential cursor motion. If a program wants to re-retrieve a row once the cursor has moved past it, the program must CLOSE the cursor and reOPEN it (causing the DBMS to perform the query again), and then FETCH through the rows until the desired row is reached. In the early 1990s, a few commercial SQL products extended the cursor concept with the concept of a scroll cursor. Unlike standard cursors, a scroll cursor provides random access to the rows of query results. The program specifies which row it wants to retrieve through an extension of the FETCH statement, shown in Figure 17-29: FETCH FIRST retrieves the first row of query results. FETCH LAST retrieves the last row of query results. FETCH PRIOR retrieves the row of query results that immediately precedes the current row of the cursor. FETCH NEXT retrieves the row of query results that immediately follows the current row of the cursor. This is the default behavior if no motion is specified and corresponds to the standard cursor motion. FETCH ABSOLUTE retrieves a specific row by its row number. FETCH RELATIVE moves the cursor forward or backward a specific number of rows relative to its current position.

Figure 18-9.

FIGURE 17-28

Part V:

Data retrieval with dynamic SQL (continued)

FIGURE 17-29

exec sql open qrycurs; exec sql whenever not found goto no_more_data; for ( ; ; ) { /* Fetch the row of data into our buffers */ exec sql fetch sqlcurs using descriptor qry_da; printf("\n"); /* Loop printing data for each column of the row */ for (i = 0; i < colcount; i++) { /* Find the SQLVAR for this column; print column label */ qry_var = qry_da->sqlvar + i; printf(" Column # %d (%s): ", i+1, qry_var->sqlname); /* Check indicator variable for NULL indication */ if (*(qry_var -> sqlind)) != 0) { puts("is NULL!\n"); continue; } /* Actual data returned; handle each type separately */ switch (qry_var -> sqltype) { case 448: case 449: /* VARCHAR data - just display it */ puts(qry_var -> sqldata); break; case 496: case 497: /* Four-byte integer data - convert & display it */ printf("%ld", *((int *) (qry_var->sqldata))); break; case 500: case 501: /* Two-byte integer data - convert & dispay it */ printf("%d", *((short *)(qry_var->sqldata))); break; case 480: case 481: /* Floating-point data - convert & display it */

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