關於C++連接數據庫的問題

 

#include "stdafx.h"

#include <afx.h>//書上沒有
#include <odbcinst.h>//書上沒有
#include <sqlext.h>
#include "iostream.h"
#pragma comment( lib, "odbc32.lib" )

int main()
{
    SQLHENV henv;
    SQLHDBC hdbc;
    SQLHSTMT hstmt;

    SQLCHAR * OutConnStr = (SQLCHAR * )malloc(255);
    SQLSMALLINT * OutConnStrLen = (SQLSMALLINT *)malloc(255);

    //環境句柄
    SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &henv);

    SQLSetEnvAttr(henv, SQL_ATTR_ODBC_VERSION, (void*)SQL_OV_ODBC3, 0);

    SQLAllocHandle(SQL_HANDLE_DBC, henv, &hdbc);

    //連接數據源
    SQLConnect(hdbc, (SQLCHAR*) "test", SQL_NTS, (SQLCHAR*) NULL, 0, NULL, 0);

    SQLAllocHandle(SQL_HANDLE_STMT, hdbc, &hstmt);

    SQLExecDirect(hstmt, (SQLCHAR*) "select top(word) from DicEn", SQL_NTS);

    //依次讀取每行
    while (SQLFetch(hstmt) != SQL_NO_DATA)
    {
    //  SQLCHAR     name[255] = {0}, gender[255] = {0}, words[255] = {0};
    //  SQLINTEGER  id, age;
    SQLINTEGER  cb;
    SQLCHAR     words[255] = {0};
        //讀取每列
        SQLGetData(hstmt, 1, SQL_C_CHAR, words, 255, &cb);
        //SQLGetData(hstmt, 1, SQL_C_ULONG, words, 0, &cb);
        //SQLGetData(hstmt, 2, SQL_C_CHAR, name, 255, &cb);
        //SQLGetData(hstmt, 3, SQL_C_ULONG, &age, 0, &cb);
        //SQLGetData(hstmt, 4, SQL_C_CHAR, gender, 255, &cb);
        //SQLGetData(hstmt, 5, SQL_C_CHAR, words, 255, &cb);

        //輸出
        //printf("%d/t%s/t%d/t%s/t%s/r/n", id, name, age, gender, words);
        cout<<words<<endl;
    }

    //釋放資源
    SQLFreeHandle(SQL_HANDLE_STMT, hstmt);
    SQLDisconnect(hdbc);
    SQLFreeHandle(SQL_HANDLE_DBC, hdbc);
    SQLFreeHandle(SQL_HANDLE_ENV, henv);

    return 0;
}

問題先掛着.明天去圖書館翻書.

實際上並沒有讀取數據.數據源是test數據庫是sql2000.