提交与回滚事物

最新推荐文章于 2024-11-12 23:25:06 发布

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本文介绍了一个使用 InterBase (IB) 数据库组件实现的简单事务处理系统。该系统通过 TFIBTransaction 表单实现数据库连接、事务启动、提交及回滚等功能。IBTransaction1 用于管理事务状态，而 IBTable1 用于操作数据库表数据。

unit U_Transaction;
interface
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, Grids, DBGrids, ExtCtrls, DBCtrls, DB,
  IBCustomDataSet, IBTable, IBDatabase;

type
  TFIBTransaction = class(TForm)
    IBTransaction1: TIBTransaction;
    DataSource1: TDataSource;
    IBDatabase1: TIBDatabase;
    IBTable1: TIBTable;
    DBNavigator1: TDBNavigator;
    DBGrid1: TDBGrid;
    Button1: TButton;
    Button2: TButton;
    IBTable1COUNTRY: TIBStringField;
    IBTable1CURRENCY: TIBStringField;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  FIBTransaction: TFIBTransaction;

implementation

{$R *.dfm}

procedure TFIBTransaction.FormCreate(Sender: TObject);
begin
   IBDatabase1.Open;
   IBTransaction1.StartTransaction;
   IBTable1.Open;
end;

procedure TFIBTransaction.Button1Click(Sender: TObject);
begin
  IBTransaction1.CommitRetaining;
  IBTable1.Refresh;
end;

procedure TFIBTransaction.Button2Click(Sender: TObject);
begin
  IBTransaction1.RollbackRetaining;
  IBTable1.Refresh;
end;

end.