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. . . /* Program has previously generated and prepared a SELECT statement like this one: SELECT A, B, C ... FROM SALESREPS WHERE EMPL_NUM IN ( , , ... ) with a variable number of parameters to be specified. The number of parameters for this execution is stored in the variable parmcnt. */ *malloc() char SQLDA *parmda; SQLVAR *parmvar; long parm_value[101]; /* Allocate a SQLDA to pass parameter values */ parmda = (SQLDA *)malloc(sizeof(SQLDA) + parmcnt * sizeof(SQLVAR)); parmda->sqln = parmcnt; /* Prompt the user for parameter values */ for (i = 0; i < parmcnt; I++) { printf("Enter employee number: "); scanf("%ld", &(parm_value[i])); parmvar = parmda -> sqlvar + I; parmvar->sqltype = 496; parmvar->sqllen = 4; parmvar->sqldata = &(parm_value[i]); parmvar->sqlind = 0; } /* Open the cursor to start the query, passing parameters */ exec sql open qrycursor using descriptor :parmda; . . .

The value returned by the dbresults() function tells the program whether the corresponding statement in the statement batch succeeded or failed. To get more detailed information about a failure, your program must provide its own message-handling

FIGURE 18-14

Note carefully that the SQLDA used in the OPEN statement has absolutely nothing to do with the SQLDA used in the DESCRIBE and FETCH statements: The SQLDA in the OPEN statement is used to pass parameter values to the DBMS for dynamic query execution. The elements of its SQLVAR array correspond to the parameter markers in the dynamic statement text. The SQLDA in the DESCRIBE and FETCH statements receives descriptions of the query results columns from the DBMS and tells the DBMS where to place the retrieved query results. The elements of its SQLVAR array correspond to the columns of query results produced by the dynamic query.

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/* Execute statements previously with dbcmd() calls */ dbsqlexec(dbproc); /* Loop checking results of each statement in the batch */ while (status = dbresults(dbproc) != NO_MORE_RESULTS { if (status == FAIL) goto handle_error; else printf( Statement succeeded.\n ); } /* Done with loop; batch completed successfully */ printf( Batch complete.\n ); exit();

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18:

Figure 19-5.

Dynamic SQL*

function. The dblib software automatically calls the message-handling function when SQL Server encounters an error while executing SQL statements. Note that dblib calls the message-handling function during its processing of the dbsqlexec() or dbresults() function calls, before it returns to your program (i.e., it is a callback function, called back by the SQL Server software). This allows the message-handling function to do its own error processing. Figure 19-6 shows an excerpt from a SQL Server program that includes a messagehandling function called msg_rtn(). When the program begins, it activates the message-handling function by calling msghandle(). Suppose an error occurs later, while SQL Server is processing the DELETE statement. When the program calls

The dynamic FETCH statement, shown in Figure 18-15, is a variation of the static FETCH statement It advances the cursor to the next available row of query results (or the requested row if the cursor is scrollable and one of the scroll keywords is used) and retrieves the values of its columns into the program s data areas Recall from 17 that the static FETCH statement includes an INTO clause with a list of host variables that receive the retrieved column values In the dynamic FETCH statement, the list of host variables is replaced by a SQLDA Before using the dynamic FETCH statement, it is the application program s responsibility to provide data areas to receive the retrieved data and indicator variable for each column.

/* External variables to hold error information */ int errcode; /* saved error code */ char errmsg[256]; /* saved error message */ /* Define our own message-handling function */ int msg_rtn(dbproc, msgno, msgstate, severity, msgtext) DBPROCESS *dbproc; DBINT msgno; int msgstate; int severity; char *msgtext; extern int errcode; extern char *errmsg; { /* Print out the error number and message */ printf( *** Error: %d Message: %s\n , msgno, msgtext); /* Save the error information for the application program */ errcode = msgno; strcpy(errmsg, msgtext); /* Return to dlib to complete the API call */ return(0); }

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