delphi DataModule1 使用方法

最新推荐文章于 2020-07-24 17:06:53 发布

iteye_18591

最新推荐文章于 2020-07-24 17:06:53 发布

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本文介绍了一个使用Delphi实现的简单数据库展示页面案例。该案例通过DataModule连接数据库，并利用ADOQuery执行SQL查询来获取数据，最后将结果显示在DBGrid中。涉及的技术包括Delphi界面设计、ADO组件使用及SQL语句编写。

数据显示页面：

unit Unit1;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, Grids, DBGrids, DB, ADODB, StdCtrls, DBCtrls, ExtCtrls;

type
TForm1 = class(TForm)
DBGrid1: TDBGrid;
Button1: TButton;
procedure Button1Click(Sender: TObject);

private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}
uses Unit2;

procedure TForm1.Button1Click(Sender: TObject);
begin
// DataModule1.Destroy;
DataModule1.ADOQuery1.Connection:=DataModule1.ADOConnection1;
DataModule1.ADOQuery1.SQL.Text:='select * from ts_cbsb';
DataModule1.ADOQuery1.Active:=true;
DataModule1.DataSource1.DataSet:=DataModule1.ADOQuery1;
dbgrid1.DataSource:= DataModule1.DataSource1;
end;

end.

Unit2页面

unit Unit2;

interface

uses
SysUtils, Classes, DB, ADODB;

type
TDataModule1 = class(TDataModule)
ADOConnection1: TADOConnection;
ADOQuery1: TADOQuery;
DataSource1: TDataSource;
private
{ Private declarations }
public
{ Public declarations }
end;

var
DataModule1: TDataModule1;

implementation

{$R *.dfm}

end.

工程文件：

program Project1;

uses
Forms,
Unit1 in 'Unit1.pas' {Form1},
Unit2 in 'Unit2.pas' {DataModule1: TDataModule};

{$R *.res}

begin
Application.Initialize;
Application.CreateForm(TForm1, Form1);
Application.CreateForm(TDataModule1, DataModule1);

Application.Run;
end.