使用原生ADO进行数据库存取。

使用原生ADO进行数据存储，本例子能够显示，向下翻页，但向上翻页有问题。修改后的存储，删除等都存在问题，各位朋友修改一下，我只当起个抛砖引玉的作用。

//.cpp程序

//---------------------------------------------------------------------------

#include <vcl.h>

#pragma hdrstop

#include "Unit1.h"

//---------------------------------------------------------------------------

#pragma package(smart_init)

#pragma resource "*.dfm"

#include <DAO_97.h>

TForm1 *Form1;

//---------------------------------------------------------------------------

__fastcall TForm1::TForm1(TComponent* Owner)

: TForm(Owner)

{

}

//---------------------------------------------------------------------------

void __fastcall TForm1::Button1Click(TObject *Sender)

{

VConnect= CreateOleObject("ADODB.Connection");

// 打开连接

VConnect.OleFunction("Open","Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\\ado\\bcdemos.mdb;Persist Security Info=False");

}

//---------------------------------------------------------------------------

void __fastcall TForm1::Button2Click(TObject *Sender)

{

VRecordSet=CreateOleObject("ADODB.RecordSet");

VRecordSet.OlePropertySet("ActiveConnection",VConnect);

// 设定指令类型与内容

VRecordSet.OleFunction("Open","Select * from employee", VConnect); // 执行指令

ShowRecord();

}

//---------------------------------------------------------------------------

void TForm1::ShowRecord()

{

txtEmpNo->Text=VarToStr(VRecordSet.OlePropertyGet("Fields","EmpNo"));

txtLastName->Text=VarToStr(VRecordSet.OlePropertyGet("Fields","LastName"));

txtFirstName->Text=VarToStr(VRecordSet.OlePropertyGet("Fields","FirstName"));

txtPhone->Text=VarToStr(VRecordSet.OlePropertyGet("Fields","PhoneExt"));

txtHireDate->Text=VarToStr(VRecordSet.OlePropertyGet("Fields","HireDate"));

txtSalary->Text=VarToStr(VRecordSet.OlePropertyGet("Fields","Salary"));

}

void __fastcall TForm1::Button3Click(TObject *Sender)

{

VRecordSet.OleFunction("Update","LastName",txtLastName->Text);

}

//---------------------------------------------------------------------------

void __fastcall TForm1::Button4Click(TObject *Sender)

{

if (! VRecordSet.OlePropertyGet("BOF") ){

VRecordSet.OleFunction("MoveFirst") ;

ShowRecord();

}

}

//---------------------------------------------------------------------------

void __fastcall TForm1::Button6Click(TObject *Sender)

{

if (! VRecordSet.OlePropertyGet("BOF") ){

VRecordSet.OleFunction("MovePrevious");

ShowRecord();

}

}

//---------------------------------------------------------------------------

void __fastcall TForm1::Button7Click(TObject *Sender)

{

if (! VRecordSet.OlePropertyGet("EOF") ){

VRecordSet.OleFunction("MoveNext");

ShowRecord();

}

}

//---------------------------------------------------------------------------

void __fastcall TForm1::Button5Click(TObject *Sender)

{

//if (! VRecordSet.OlePropertyGet("EOF") ){

VRecordSet.OleFunction("MoveLast");

ShowRecord();

// }

}

//---------------------------------------------------------------------------

//.h程序

//---------------------------------------------------------------------------

#ifndef Unit1H

#define Unit1H

//---------------------------------------------------------------------------

#include <Classes.hpp>

#include <Controls.hpp>

#include <StdCtrls.hpp>

#include <Forms.hpp>

#include <ExtCtrls.hpp>

#include <Graphics.hpp>

#include <ADODB.hpp>

#include <Db.hpp>

#include <ComObj.hpp>

#include <DBGrids.hpp>

#include <Grids.hpp>

//---------------------------------------------------------------------------

class TForm1 : public TForm

{

__published: // IDE-managed Components

TPanel *Panel1;

TButton *Button1;

TButton *Button2;

TButton *Button3;

TButton *Button4;

TButton *Button5;

TButton *Button6;

TButton *Button7;

TLabel *Label1;

TEdit *txtEmpNo;

TLabel *Label2;

TEdit *txtLastName;

TLabel *Label3;

TEdit *txtFirstName;

TLabel *Label4;

TEdit *txtPhone;

TLabel *Label5;

TEdit *txtHireDate;

TLabel *Label6;

TEdit *txtSalary;

void __fastcall Button1Click(TObject *Sender);

void __fastcall Button2Click(TObject *Sender);

void __fastcall Button3Click(TObject *Sender);

void __fastcall Button4Click(TObject *Sender);

void __fastcall Button6Click(TObject *Sender);

void __fastcall Button7Click(TObject *Sender);

void __fastcall Button5Click(TObject *Sender);

void __fastcall FormCreate(TObject *Sender);

private: // User declarations

Variant VConnect;

Variant VRecordSet;

void ShowRecord();

public: // User declarations

__fastcall TForm1(TComponent* Owner);

};

//---------------------------------------------------------------------------

extern PACKAGE TForm1 *Form1;

//---------------------------------------------------------------------------

#endif