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PART V
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Programming with SQL
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main() { LOGINREC char short float *loginrec; repname[16]; repquota; repsales; /* data structure for login information */ /* data structure for connection */ /* retrieved city for the office */ /* retrieved employee number of mgr */ /* retrieved sales for office */ DBPROCESS *dbproc;
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/* Open a connection to SQL Server */ loginrec = dblogin(); DBSETLUSER(loginrec, "scott"); DBSETLPWD (loginrec, "tiger"); dbproc = dbopen(loginrec, ""); /* Pass query to dblib and ask SQL Server to execute it */ dbcmd(dbproc, "select name, quota, sales from salesreps "); dbcmd(dbproc, "where sales > quota order by name "); dbsqlexec(dbproc); /* Get first statement in the batch */ dbresults(dbproc); /* Bind each column to a variable in this program */ dbbind(dbproc, 1, NTBSTRINGBIND, 16, &repname); dbbind(dbproc, 2, FLT4BIND, dbbind(dbproc, 3, FLT4BIND, 0, &repquota); 0, &repsales); 3 2 1
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/* Loop retrieving rows of query results */ while (status = dbnextrow(dbproc) == SUCCEED) { /* Print data for this salesperson */ printf( Name: %s\n , repname); repsales); printf( Quota: %f\n\n , repquota); printf( Sales: %f\n , } /* Check for errors and close connection */ if (status == FAIL) { printf( SQL error.\n ); dbexit(dbproc); exit(); } 5 4
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FIGURE 19-10
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main() { exec sql int char float float exec sql begin declare section; repnum; repname[16]; repquota; repsales; end declare section; /* employee number (from user) */ /* retrieved salesperson name */ /* retrieved quota */ /* retrieved sales */
/* Prompt the user for the employee number */ printf("Enter salesrep number: "); scanf("%d", &repnum); /* Execute the SQL query */ exec sql select name, quota, sales into :repname, :repquota, :repsales; from salesreps where empl_num = :repnum /* Display the retrieved data */ if (sqlca.sqlcode = = 0) { printf("Name: %s\n", repname); 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(); }
PART V
FIGURE 19-11
Embedded SQL singleton SELECT statement (from Figure 17-20)
Retrieving NULL Values
The dbnextrow() and dbbind() calls shown in Figure 19-10 provide a simple way to retrieve query results, but they do not support NULL values. When a row retrieved by dbnextrow() includes a column with a NULL value, SQL Server replaces the NULL with a NULL substitution value. By default, SQL Server uses zero as a substitution value for numeric data types, a string of blanks for fixed-length strings, and an empty string for variable-length strings. The application program can change the default value for any data type by calling the API function dbsetnull().
Part V:
Programming with SQL
FIGURE 19-12 Embedded SQL multirow query processing (from Figure 17-23)
main() { exec sql include sqlca; exec sql begin declare section; char repname[16]; /* retrieved salesperson name */ /* retrieved quota */ /* retrieved sales */ /* null quota indicator */ float repquota; float repsales; short repquota_ind; exec sql end declare section; /* 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 (;;) { /* Fetch the next row of query results */ exec sql fetch repcurs 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(); }
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