/**********************************************************************
* FILENAME : ListDSNs.c
*
* DESCRIPTION :
* Simple example to list the Data Sources available
*
* ODBC USAGE :
* Loop until no more data
* SQLDataSources() - with direction = SQL_FETCH_FIRST first time
* and with direction = SQL_FETCH_NEXT subsequently
* prints ODBC driver names found
*/
#include <stdio.h>
#include <stdlib.h>
#include <sql.h>
#include <sqlext.h>
#include <string.h>
#include "util.c"
int main () {
SQLHENV henv = SQL_NULL_HENV; // Environment
SQLRETURN retcode; // Return status
SQLCHAR dsnName[256];
SQLSMALLINT dsnNameLenReturned;
SQLCHAR driverDesc[256];
SQLSMALLINT driverDescLenReturned;
SQLUSMALLINT direction;
// Allocate environment handle
retcode = SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &henv);
CHECK_ERROR(retcode, "SQL_HANDLE_ENV(SQL_NULL_HANDLE)",
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_NULL_HANDLE);
// Get Data source names
direction = SQL_FETCH_FIRST;
while (SQL_SUCCEEDED(retcode=SQLDataSources(henv,
direction,
dsnName,
sizeof(dsnName),
&dsnNameLenReturned,
driverDesc,
sizeof(driverDesc),
&driverDescLenReturned))) {
direction = SQL_FETCH_NEXT;
printf("Data Source - %s\n", dsnName);
CHECK_ERROR(retcode, "SQLDrivers()", henv, SQL_NULL_HANDLE);
}
exit:
printf ("\nComplete.\n");
if (henv!=SQL_NULL_HENV) SQLFreeHandle(SQL_HANDLE_ENV, henv);
return 0;
}
Further information
