SQLConnect_ref.cpp

// SQLConnect_ref.cpp
// compile with: odbc32.lib
#include <windows.h>
#include <sqlext.h>
 
int main() {
    SQLHENV henv;
    SQLHDBC hdbc;
    SQLHSTMT hstmt;
    SQLRETURN retcode;
 
    SQLCHAR * OutConnStr = (SQLCHAR *)malloc();
    SQLSMALLINT * OutConnStrLen = (SQLSMALLINT *)malloc();
 
    // Allocate environment handle
    retcode = SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &henv);
 
    // Set the ODBC version environment attribute
    if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO) {
        retcode = SQLSetEnvAttr(henv, SQL_ATTR_ODBC_VERSION, (void*)SQL_OV_ODBC3, );
 
        // Allocate connection handle
        if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO) {
            retcode = SQLAllocHandle(SQL_HANDLE_DBC, henv, &hdbc);
 
            // Set login timeout to 5 seconds
            if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO) {
                SQLSetConnectAttr(hdbc, SQL_LOGIN_TIMEOUT, (SQLPOINTER), );
 
                // Connect to data source
                retcode = SQLConnect(hdbc, (SQLWCHAR*) "NorthWind", SQL_NTS, (SQLWCHAR*)NULL, , NULL, );
 
                // Allocate statement handle
                if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO) {
                    retcode = SQLAllocHandle(SQL_HANDLE_STMT, hdbc, &hstmt);
 
                    // Process data
                    if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO) {
                        SQLFreeHandle(SQL_HANDLE_STMT, hstmt);
                    }
 
                    SQLDisconnect(hdbc);
                }
 
                SQLFreeHandle(SQL_HANDLE_DBC, hdbc);
            }
        }
        SQLFreeHandle(SQL_HANDLE_ENV, henv);
    }
}