如何调用带输出参数的存储过程 CDatabase看来不能调用此类存储过程。请问VC如何使用ADO,请给完整实例 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 CRecordset类如何访问存储过程取得返回值?答】用MFC ODBC重载crecordset://chcode.hclass chcode : public CRecordset{public: void Move( long nrows, WORD wfetchtype ); chcode(CDatabase* pDatabase = NULL); DECLARE_DYNAMIC(chcode) // Field/Param Data //{{AFX_FIELD(chcode, CRecordset) long m_retreturn_value; CString m_newpassword; CString m_oldpassword; CString m_username; //}}AFX_FIELD// Overrides // ClassWizard generated virtual function overrides //{{AFX_VIRTUAL(chcode) public: virtual CString GetDefaultConnect(); // Default connection string virtual CString GetDefaultSQL(); // Default SQL for Recordset virtual void DoFieldExchange(CFieldExchange* pFX); // RFX support //}}AFX_VIRTUAL// Implementation#ifdef _DEBUG virtual void AssertValid() const; virtual void Dump(CDumpContext& dc) const;#endif};//{{AFX_INSERT_LOCATION}}// Microsoft Visual C++ will insert additional declarations immediately before the previous line.#endif // !defined(AFX_CHCODE_H__FF9F8501_31F2_4794_B697_B7FFB5A15C30__INCLUDED_)//chcode.cpp// chcode.cpp : implementation file//#include "stdafx.h"#include "chcode.h"#ifdef _DEBUG#define new DEBUG_NEW#undef THIS_FILEstatic char THIS_FILE[] = __FILE__;#endif/////////////////////////////////////////////////////////////////////////////// chcodevoid AFXAPI RFX_Textout(CFieldExchange * pfx, LPCTSTR szname,CString& value, int nmaxlength, int ncolumntype, short nscale);IMPLEMENT_DYNAMIC(chcode, CRecordset)chcode::chcode(CDatabase* pdb) : CRecordset(pdb){ //{{AFX_FIELD_INIT(chcode) m_oldpassword=""; m_newpassword=""; m_username=""; //}}AFX_FIELD_INIT m_nDefaultType = snapshot; m_nParams=4; }CString chcode::GetDefaultConnect(){ return _T("ODBC;DSN=");}CString chcode::GetDefaultSQL(){ return _T("");}void chcode::DoFieldExchange(CFieldExchange* pFX){ //{{AFX_FIELD_MAP(chcode) pFX->SetFieldType(CFieldExchange ::outputParam); //set the field type to outputParam for the return value RFX_Long(pFX, _T("return_value"), m_retreturn_value); //bind the return value to the variable pFX->SetFieldType(CFieldExchange ::inputParam); //reset the field type to inputParam RFX_Text(pFX, "@old", m_oldpassword);//,255,SQL_CHAR,0); RFX_Text(pFX, "@new", m_newpassword);//,255,SQL_CHAR,0); //call the new rfx_Text to get the character output params RFX_Text(pFX, "@loginame", m_username);//,255,SQL_CHAR,0); //}}AFX_FIELD_MAP}/////////////////////////////////////////////////////////////////////////////// chcode diagnostics#ifdef _DEBUGvoid chcode::AssertValid() const{ CRecordset::AssertValid();}void chcode::Dump(CDumpContext& dc) const{ CRecordset::Dump(dc);}#endif //_DEBUG//Move(long nRows, WORD wFetchType)void chcode::Move(long nrows, WORD wfetchtype){ if (m_nFields) CRecordset ::Move(nrows, wfetchtype); else m_bBOF = m_bEOF = true;}调用:CDatabase db1; s1.Format("ODBC;UID=sa;PWD=%s",""); db1.Open("report",false,false,s1); chcode chrs(&db1); //CRecordset rs(&db1); chrs.m_newpassword=in.m1; chrs.m_oldpassword=s3; chrs.m_username="report"; chrs.Open( AFX_DB_USE_DEFAULT_TYPE ,_T("{?=CALL sp_password(?,?,?)}")); //chrs.Open(AFX_DB_USE_DEFAULT_TYPE,"{call sp_password('report','report','report')}"); //chrs.m_retreturn_value;这就是返回值 chrs.Close(); db1.Close();你也可以去看看下面的例子:http://www.codeproject.com/database/mssqltutorial.asphttp://www.codeproject.com/database/MyRecordset.asphttp://www.codeproject.com/database/spcw.asp ADO操作的例子很多,FAQ里就有不少 用libjpeg.lib库把BMP压缩成JPG的问题 在深圳找vc兼职, 有需要的联系我! 用过或看过王骏编写的《轻松实现类VC界面》这篇文章的帮帮忙。 包含<fstream>与<fstream.h>执行结果不一样,纳闷!谁能告诉我原因? 请问如何用VC设置本机的IP地址? 求解过滤和统计问题,急用,谢谢! 能在sdk编程中在对话框中加入菜单吗? ExitWindows、IXY请进来领分。版主请勿删,借个地方,谢谢了。 CReordset类的大数据存取问题 100分,如何恢复窗口 急!如何利用GDI进行高速绘图,请各位星星角角畅所欲言! 一个程序中的若干个小问题,请大家帮忙~!
答】
用MFC ODBC
重载crecordset:
//chcode.h
class chcode : public CRecordset
{
public:
void Move( long nrows, WORD wfetchtype );
chcode(CDatabase* pDatabase = NULL);
DECLARE_DYNAMIC(chcode)
// Field/Param Data
//{{AFX_FIELD(chcode, CRecordset)
long m_retreturn_value;
CString m_newpassword;
CString m_oldpassword;
CString m_username;
//}}AFX_FIELD
// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(chcode)
public:
virtual CString GetDefaultConnect(); // Default connection string
virtual CString GetDefaultSQL(); // Default SQL for Recordset
virtual void DoFieldExchange(CFieldExchange* pFX); // RFX support
//}}AFX_VIRTUAL// Implementation
#ifdef _DEBUG
virtual void AssertValid() const;
virtual void Dump(CDumpContext& dc) const;
#endif
};//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.#endif // !defined(AFX_CHCODE_H__FF9F8501_31F2_4794_B697_B7FFB5A15C30__INCLUDED_)
//chcode.cpp
// chcode.cpp : implementation file
//#include "stdafx.h"
#include "chcode.h"#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif/////////////////////////////////////////////////////////////////////////////
// chcode
void AFXAPI RFX_Textout(CFieldExchange * pfx, LPCTSTR szname,
CString& value, int nmaxlength, int ncolumntype, short nscale);
IMPLEMENT_DYNAMIC(chcode, CRecordset)chcode::chcode(CDatabase* pdb)
: CRecordset(pdb)
{
//{{AFX_FIELD_INIT(chcode)
m_oldpassword="";
m_newpassword="";
m_username="";
//}}AFX_FIELD_INIT
m_nDefaultType = snapshot;
m_nParams=4; }
CString chcode::GetDefaultConnect()
{
return _T("ODBC;DSN=");
}CString chcode::GetDefaultSQL()
{
return _T("");
}void chcode::DoFieldExchange(CFieldExchange* pFX)
{
//{{AFX_FIELD_MAP(chcode)
pFX->SetFieldType(CFieldExchange ::outputParam); //set the field type to outputParam for the return value
RFX_Long(pFX, _T("return_value"), m_retreturn_value); //bind the return value to the variable
pFX->SetFieldType(CFieldExchange ::inputParam); //reset the field type to inputParam
RFX_Text(pFX, "@old", m_oldpassword);//,255,SQL_CHAR,0);
RFX_Text(pFX, "@new", m_newpassword);//,255,SQL_CHAR,0); //call the new rfx_Text to get the character output params
RFX_Text(pFX, "@loginame", m_username);//,255,SQL_CHAR,0);
//}}AFX_FIELD_MAP
}/////////////////////////////////////////////////////////////////////////////
// chcode diagnostics#ifdef _DEBUG
void chcode::AssertValid() const
{
CRecordset::AssertValid();
}void chcode::Dump(CDumpContext& dc) const
{
CRecordset::Dump(dc);
}
#endif //_DEBUG
//Move(long nRows, WORD wFetchType)
void chcode::Move(long nrows, WORD wfetchtype)
{
if (m_nFields)
CRecordset ::Move(nrows, wfetchtype);
else
m_bBOF = m_bEOF = true;
}
调用:CDatabase db1;
s1.Format("ODBC;UID=sa;PWD=%s","");
db1.Open("report",false,false,s1);
chcode chrs(&db1);
//CRecordset rs(&db1);
chrs.m_newpassword=in.m1;
chrs.m_oldpassword=s3;
chrs.m_username="report";
chrs.Open( AFX_DB_USE_DEFAULT_TYPE ,_T("{?=CALL sp_password(?,?,?)}"));
//chrs.Open(AFX_DB_USE_DEFAULT_TYPE,"{call sp_password('report','report','report')}");
//chrs.m_retreturn_value;这就是返回值
chrs.Close();
db1.Close();你也可以去看看下面的例子:
http://www.codeproject.com/database/mssqltutorial.asp
http://www.codeproject.com/database/MyRecordset.asp
http://www.codeproject.com/database/spcw.asp