/**********************************************************************
* FILENAME : CallSPWithParamArray
*
*
* DESCRIPTION :
* Simple ODBC example to SELECT data from a table via a
* stored procedure which takes an array of parameters.
*
* The stored procedure takes one parameter,
* in the form :
*
* {CALL Stored_Procedure (?)}
*
* ODBC USAGE :
* Creates an array of record ids (PersonID) to select
* from TestTBL1 via a stored procedure 'Find_Record'
* Drops and recreates a procedure 'Find_Record'
* Creates statement handle and sets up parameter array
* usage with SQLSetStmtAttr() to specify :
* SQL_ATTR_PARAMSET_SIZE
* SQL_ATTR_PARAM_STATUS_PTR
* SQL_ATTR_PARAMS_PROCESSED_PTR
* Binds the address of first element of the parameter
* array to parameter 1 of the stored proc.
* Executes the stored proc using SQLExecDirect() and
* uses SQLNumResultCols(), SQLFetch(), SQLRowCount() and
* SQLMoreResults() to process the records set(s) returned.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <sql.h>
#include <sqlext.h>
#include <string.h>
#include "util.c"
#include "CallSPUtil.c"
#define PARAM_ARRAY_SIZE 50 // number of params in param array
int main () {
SQLHENV henv = SQL_NULL_HENV; // Environment
SQLHDBC hdbc = SQL_NULL_HDBC; // Connection handle
SQLHSTMT hstmt = SQL_NULL_HSTMT; // Statement handle
SQLRETURN retcode; // Return status
SQLCHAR * strCallSP = "{CALL Find_Record(?)}";
char * strProcName = "Find_Record";
SQLSMALLINT columns; // Number of columns in result-set
int i, count;
SQLINTEGER pPersonIDs [PARAM_ARRAY_SIZE] =
{111,2,3,4,5,6,7,8,9,10,
11,12,13,14,15,16,17,18,19,20,
21,22,23,24,25,26,27,28,29,30,
31,32,33,34,35,36,37,38,39,40,
41,42,43,44,45,46,47,48,49,50};
SQLUSMALLINT ParamStatusArray[PARAM_ARRAY_SIZE];
SQLINTEGER ParamsProcessed=0;
// Allocate an environment handle
retcode=SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &henv);
CHECK_ERROR(retcode, "SQLAllocHandle(ENV)", henv, SQL_HANDLE_ENV);
// Set ODBC Version
retcode=SQLSetEnvAttr(henv, SQL_ATTR_ODBC_VERSION,
(void *) SQL_OV_ODBC3, 0);
CHECK_ERROR(retcode, "SQLSetEnvAttr(SQL_ATTR_ODBC_VERSION)",
henv, SQL_HANDLE_ENV);
// Allocate a connection handle
retcode=SQLAllocHandle(SQL_HANDLE_DBC, henv, &hdbc);
CHECK_ERROR(retcode, "SQLAllocHandle(SQL_HANDLE_DBC)",
hdbc, SQL_HANDLE_DBC);
// DSN
retcode=SQLDriverConnect(hdbc, NULL, "DSN=DATASOURCE;", SQL_NTS,
NULL, 0, NULL, SQL_DRIVER_COMPLETE);
CHECK_ERROR(retcode, "SQLDriverConnect(DATASOURCE)",
hdbc, SQL_HANDLE_DBC);
retcode = DropProcedure (hdbc, strProcName);
retcode = CreateProcedure (hdbc, strProcName);
retcode = ListProcedure (hdbc, strProcName);
// Allocate a statement handle
retcode=SQLAllocHandle(SQL_HANDLE_STMT, hdbc, &hstmt);
CHECK_ERROR(retcode, "SQLAllocHandle(SQL_HANDLE_STMT)",
hstmt, SQL_HANDLE_STMT);
// Setup for parameter array processing
retcode = SQLSetStmtAttr (hstmt, SQL_ATTR_PARAMSET_SIZE,
(SQLPOINTER) PARAM_ARRAY_SIZE, 0);
retcode = SQLSetStmtAttr (hstmt, SQL_ATTR_PARAM_STATUS_PTR,
ParamStatusArray, PARAM_ARRAY_SIZE);
retcode = SQLSetStmtAttr (hstmt, SQL_ATTR_PARAMS_PROCESSED_PTR,
&ParamsProcessed, 0);
// Bind array values of parameter 1 data in
retcode = SQLBindParameter(hstmt, 1, SQL_PARAM_INPUT, SQL_C_LONG,
SQL_INTEGER, 0, 0, pPersonIDs, 0, NULL);
CHECK_ERROR(retcode, "SQLBindParameter(SQL_PARAM_INPUT)",
hstmt, SQL_HANDLE_STMT);
retcode = SQLExecDirect (hstmt, strCallSP, SQL_NTS);
CHECK_ERROR(retcode, "SQLExecDirect(SQL_HANDLE_STMT)",
hstmt, SQL_HANDLE_STMT);
printf ("\nPersonID Firstname Surname Address City");
printf ("\n-------- --------- ------- ------- ----\n");
SQLLEN indicator, RowCount;
char *buf=malloc (255);
int params=1;
do {
// SQLNumResultCols() returns number of columns in result set.
// If non zero use SQLFetch until SQL_NO_DATA returned
retcode=SQLNumResultCols(hstmt, &columns);
CHECK_ERROR(retcode, "SQLNumResultCols()", hstmt, SQL_HANDLE_STMT);
printf ("\nColumns : %i", columns);
if (columns > 0) {
printf ("\nParam No : %i", params);
printf ("\nStart Fetch ...");
while (SQLFetch(hstmt) != SQL_NO_DATA) {
// Loop through the columns
memset (buf, ' ', 255);
printf ("\n");
for (i = 1; i <= columns; i++) {
// retrieve column data as a string
retcode = SQLGetData(hstmt, i, SQL_C_CHAR,
buf, 255, &indicator);
if (SQL_SUCCEEDED(retcode)) {
// Handle null columns
if (indicator == SQL_NULL_DATA)
strcpy (buf, "NULL");
buf=rtrim(buf, ' ');
printf("%10s ", buf);
}
}
}
printf ("\nEnd Fetch ...");
}
else {
// SQLRowCount returns number of rows affected by INSERT, UPDATE,
// DELETE or (if supported by the driver) number of rows returned
// by a SELECT
retcode=SQLRowCount(hstmt, &RowCount);
CHECK_ERROR(retcode, "SQLRowCount()", hstmt, SQL_HANDLE_STMT);
printf ("\nRow count is : %i", (int) RowCount);
params++;
}
if (columns==0)
printf ("\n-----------");
} while (SQLMoreResults(hstmt) == SQL_SUCCESS);
exit:
free (buf);
printf ("\nComplete.\n");
// Free handles
// Statement
if (hstmt != SQL_NULL_HSTMT)
SQLFreeHandle(SQL_HANDLE_STMT, hstmt);
// Connection
if (hdbc != SQL_NULL_HDBC) {
SQLDisconnect(hdbc);
SQLFreeHandle(SQL_HANDLE_DBC, hdbc);
}
// Environment
if (henv != SQL_NULL_HENV)
SQLFreeHandle(SQL_HANDLE_ENV, henv);
return 0;
}
See Also
