VC中用DAO实现树型控件的数据库访问
2009-06-08 20:07:55 来源:WEB开发网6、使用Class Wizard向导在CmainFrame类中加入OnCreateClient()函数 、在CshengViewp类中加入OnTimer()、OnInitialUpdate()等函数;
7、添加程序代码,编译运行程序。
三、 程序代码
////////////////////////////////////////////////// ShengSet.h : header file
#if !defined(AFX_SHENGSET_H__2B60B60D_A4AB_46AC_9B71_D31623CD0C87__INCLUDED_)
#define AFX_SHENGSET_H__2B60B60D_A4AB_46AC_9B71_D31623CD0C87__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
class CShengSet : public CDaoRecordset
{
public:
CShengSet(CDaoDatabase* pDatabase = NULL);
DECLARE_DYNAMIC(CShengSet)
// Field/Param Data
//{{AFX_FIELD(CShengSet, CDaoRecordset)
long m_ID;
CString m_column1;
CString m_column2;
long m_column3;
CString m_column4;
CString m_column5;
//}}AFX_FIELD
// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CShengSet)
public:
virtual CString GetDefaultDBName(); // Default database name
virtual CString GetDefaultSQL(); // Default SQL for Recordset
virtual void DoFieldExchange(CDaoFieldExchange* pFX); // RFX support
//}}AFX_VIRTUAL
// Implementation
#ifdef _DEBUG
virtual void AssertValid() const;
virtual void Dump(CDumpContext& dc) const;
#endif
};
#endif
///////////////////////////////// ShengSet.cpp : implementation file
#include "stdafx.h"
#include "Ppp.h"
#include "ShengSet.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
IMPLEMENT_DYNAMIC(CShengSet, CDaoRecordset)
CShengSet::CShengSet(CDaoDatabase* pdb)
: CDaoRecordset(pdb)
{
//{{AFX_FIELD_INIT(CShengSet)
m_ID = 0;
m_column1 = _T("");
m_column2 = _T("");
m_column3 = 0;
m_column4 = _T("");
m_column5 = _T("");
m_nFields = 6;
//}}AFX_FIELD_INIT
m_nDefaultType = dbOpenDynaset;
}
CString CShengSet::GetDefaultDBName()
{
return _T("全国.mdb");
}
CString CShengSet::GetDefaultSQL()
{
return _T("[省]");
}
void CShengSet::DoFieldExchange(CDaoFieldExchange* pFX)
{
//{{AFX_FIELD_MAP(CShengSet)
pFX->SetFieldType(CDaoFieldExchange::outputColumn);
DFX_Long(pFX, _T("[ID]"), m_ID);
DFX_Text(pFX, _T("[省名称]"), m_column1);
DFX_Text(pFX, _T("[省代码]"), m_column2);
DFX_Long(pFX, _T("[省人口]"), m_column3);
DFX_Text(pFX, _T("[省面积]"), m_column4);
DFX_Text(pFX, _T("[省简介]"), m_column5);
//}}AFX_FIELD_MAP
}
#ifdef _DEBUG
void CShengSet::AssertValid() const
{
CDaoRecordset::AssertValid();
}
void CShengSet::Dump(CDumpContext& dc) const
{
CDaoRecordset::Dump(dc);
}
#endif //_DEBUG
///////////////////////////// PppView.h : interface of the CPppView class
#if !defined(AFX_PPPVIEW_H__8635E57E_3AFE_447A_8CCB_7B1B97A1BAC3__INCLUDED_)
#define AFX_PPPVIEW_H__8635E57E_3AFE_447A_8CCB_7B1B97A1BAC3__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
#include"PppDoc.h"
#include"ShengSet.h"
class CPppView : public CFormView
{
protected: // create from serialization only
CPppView();
DECLARE_DYNCREATE(CPppView)
public:
//{{AFX_DATA(CPppView)
enum { IDD = IDD_PPP_FORM };
CTreeCtrl m_treectrl;
//}}AFX_DATA
// Attributes
public:
CPppDoc* GetDocument();
public:
CShengSet *m_ShengSet;
// Operations
public:
// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CPppView)
public:
virtual BOOL PreCreateWindow(CREATESTRUCT& cs);
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
virtual void OnInitialUpdate(); // called first time after construct
virtual BOOL OnPreparePrinting(CPrintInfo* pInfo);
virtual void OnBeginPrinting(CDC* pDC, CPrintInfo* pInfo);
virtual void OnEndPrinting(CDC* pDC, CPrintInfo* pInfo);
virtual void OnPrint(CDC* pDC, CPrintInfo* pInfo);
//}}AFX_VIRTUAL
// Implementation
public:
virtual ~CPppView();
#ifdef _DEBUG
virtual void AssertValid() const;
virtual void Dump(CDumpContext& dc) const;
#endif
protected:
// Generated message map functions
protected:
//{{AFX_MSG(CPppView)
afx_msg void OnSelchangingTree1(NMHDR* pNMHDR, LRESULT* pResult);
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};
#ifndef _DEBUG // debug version in PppView.cpp
inline CPppDoc* CPppView::GetDocument()
{ return (CPppDoc*)m_pDocument; }
#endif
#endif
////////////////// PppView.cpp : implementation of the CPppView class
#include "stdafx.h"
#include "Ppp.h"
#include "PppDoc.h"
#include "PppView.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
IMPLEMENT_DYNCREATE(CPppView, CFormView)
BEGIN_MESSAGE_MAP(CPppView, CFormView)
//{{AFX_MSG_MAP(CPppView)
ON_NOTIFY(TVN_SELCHANGING, IDC_TREE1, OnSelchangingTree1)
//}}AFX_MSG_MAP
// Standard printing commands
ON_COMMAND(ID_FILE_PRINT, CFormView::OnFilePrint)
ON_COMMAND(ID_FILE_PRINT_DIRECT, CFormView::OnFilePrint)
ON_COMMAND(ID_FILE_PRINT_PREVIEW, CFormView::OnFilePrintPreview)
END_MESSAGE_MAP()
CPppView::CPppView()
: CFormView(CPppView::IDD)
{}
CPppView::~CPppView()
{}
void CPppView::DoDataExchange(CDataExchange* pDX)
{
CFormView::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CPppView)
DDX_Control(pDX, IDC_TREE1, m_treectrl);
//}}AFX_DATA_MAP
}
BOOL CPppView::PreCreateWindow(CREATESTRUCT& cs)
{
// TODO: Modify the Window class or styles here by modifying
// the CREATESTRUCT cs
return CFormView::PreCreateWindow(cs);
}
void CPppView::OnInitialUpdate()
{
CFormView::OnInitialUpdate();
//GetParentFrame()->RecalcLayout();
//ResizeParentToFit();
CPppDoc* pDoc = (CPppDoc*)GetDocument();
m_ShengSet=&pDoc->m_ShengSet;
TV_INSERTSTRUCT tvinsert;
tvinsert.hParent = NULL;
tvinsert.item.mask = TVIF_TEXT;
tvinsert.item.pszText = "全国";
HTREEITEM hDad = m_treectrl.InsertItem(&tvinsert);
if (m_ShengSet->IsOpen())
m_ShengSet->Close();
m_ShengSet->Open();
m_ShengSet->MoveFirst();
CString c1;
char buff[80];
while(!m_ShengSet->IsEOF())
{
c1=m_ShengSet->m_column1;
wsprintf(buff,"%s",c1);
tvinsert.item.pszText = buff;
tvinsert.hParent = hDad;
m_treectrl.InsertItem(&tvinsert);
m_ShengSet->MoveNext();
}
}
BOOL CPppView::OnPreparePrinting(CPrintInfo* pInfo)
{
// default preparation
return DoPreparePrinting(pInfo);
}
void CPppView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
// TODO: add extra initialization before printing
}
void CPppView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
// TODO: add cleanup after printing
}
void CPppView::OnPrint(CDC* pDC, CPrintInfo* /*pInfo*/)
{
// TODO: add customized printing code here
}
#ifdef _DEBUG
void CPppView::AssertValid() const
{
CFormView::AssertValid();
}
void CPppView::Dump(CDumpContext& dc) const
{
CFormView::Dump(dc);
}
CPppDoc* CPppView::GetDocument() // non-debug version is inline
{
ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CPppDoc)));
return (CPppDoc*)m_pDocument;
}
#endif //_DEBUG
void CPppView::OnSelchangingTree1(NMHDR* pNMHDR, LRESULT* pResult)
{
NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
// TODO: Add your control notification handler code here
CTreeCtrl* pTree2 = (CTreeCtrl*) GetDlgItem(IDC_TREE1);
HTREEITEM hSelected = pNMTreeView->itemNew.hItem;
CPppDoc* pDoc = (CPppDoc*)GetDocument();
CString hParentName;
HTREEITEM hParent=pTree2->GetParentItem(hSelected);
if(hSelected!=NULL)
{
pDoc->Name=pTree2->GetItemText(hSelected);
}
*pResult = 0;
}
////////////////////////////////////////////////////////////// CMainFrame message handlers
BOOL CMainFrame::OnCreateClient(LPCREATESTRUCT lpcs, CCreateContext* pContext)
{
// TODO: Add your specialized code here and/or call the base class
if (!m_wndSpMain.CreateStatic(this, 1, 2))
{
TRACE0("Failed to create splitter windown");
return FALSE;
}
// Get the client rect first for calc left pane size
// create the left tree view first.
if (!m_wndSpMain.CreateView(0, 0, RUNTIME_CLASS(CPppView),
CSize(200, 200), pContext))
{
TRACE0("Failed to create left pane viewn");
return FALSE;
}
// The right pane is a frame which and contain several different views.
if (!m_wndSpMain.CreateView(0, 1,RUNTIME_CLASS(CShengView), CSize(100,100), pContext))
{
TRACE0("Failed to create right pane framen");
return FALSE;
}
return TRUE;
}
四、小结
本实例介绍了DAO编程的基本知识,并利用不同的视,巧妙地实现了树型控件与数据库相关联,实现了数据库的灵活操作。如果读者朋友需要实现类似的处理,该实例对于启迪思路一定会有所帮助。
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