VC连接SQL2005(例子ADO_2)

 

(1)    在StdAfx.h中添加下面一句话：

#import "C:/Program Files/Common Files/System/ado/msado15.dll" no_namespace rename("EOF", "rsEOF")

01 (2)    void CADO_2Dlg::OnBtnQuery()
02
03 {
04
05        CoInitialize(NULL);                                                        // 初始化COM库
06
07        _ConnectionPtr pConn(__uuidof(Connection));          // 建立Connection
08
09        _RecordsetPtr pRst(__uuidof(Recordset));          // 建立Recordset
10
11
12
13        _CommandPtr pCmd(__uuidof(Command));                     // 建立Command
14
15
16
17        try
18
19        {
20
21               //pConn->ConnectionString = "Provider=SQLOLEDB;Password=XXX;Persist Security Info=True;User ID=sa;Initial Catalog=pubs";       //此句正确
22
23               pConn->ConnectionString = "driver={SQL Server};Server=(local);DATABASE=pubs;UID=sa;PWD=xxx";
24
25               pConn->Open("", "", "", adConnectUnspecified);
26
27
28
29               //pRst = pConn->Execute("select * from authors", NULL, adCmdText);
30
31               //pRst->Open("select * from authors", _variant_t((IDispatch*) pConn), adOpenDynamic, adLockOptimistic, adCmdText);
32
33               pCmd->put_ActiveConnection(_variant_t((IDispatch*) pConn));
34
35               pCmd->CommandText = "select * from authors";
36
37               pRst = pCmd->Execute(NULL, NULL, adCmdText);
38
39
40
41
42
43               while(!pRst->rsEOF)
44
45               {
46
47                      ((CListBox*)GetDlgItem(IDC_LIST1))->AddString((_bstr_t)pRst->GetCollect("au_lname")); //查询au_lname字段
48
49                      pRst->MoveNext();
50
51               }
52
53        }
54
55        catch(_com_error e)
56
57        {
58
59               CString errormessage;
60
61               errormessage.Format("Error: %s", e.ErrorMessage());
62
63               AfxMessageBox(errormessage);
64
65        }
66
67
68
69        AfxMessageBox("查询结束!");
70
71
72
73        pRst->Close();
74
75        pConn->Close();
76
77        pRst.Release();                                                               // 释放相应COM接口上的引用计数
78
79        pConn.Release();
80
81        CoUninitialize();                                                       // 卸载COM库
82
83 }