专门为ADO二层升三层的咏南中间件(特种用途)

演示下载：链接: https://pan.baidu.com/s/1bulGBIZ6A1nkeErxIrGsGA 密码: 22dk 

解压后运行ynmain.exe

DELPHI7 开发的ADO二层C/S程序升级为三层变得异常简单。

中间件采用INDY9+ADO，在DELPHI7下直接可以编译。

有意者请向本人索取演示程序。

升级步骤：

1）安装TynDATASET控件

2）在客户端将ADOQUERY替换为ynDATASET数据集控件，原ADOQUERY的语法完全不用改，ynDATASET数据集控件兼容ADOQUERY的语法。

演示代码如下：

procedure TForm1.Button1Click(Sender: TObject);

begin

// 执行查询SQL

ynDataSet1.Close;

yndataset1.SQL.Clear;

ynDataSet1.SQL.Add('select * from t1 where c1=:c1');

ynDataSet1.Parameters.ParamByName('c1').AsInteger := 1;

ynDataSet1.Open;

end;

procedure TForm1.Button2Click(Sender: TObject);

begin

// 保存修改后的数据

ynDataSet1.Post;

end;

procedure TForm1.Button3Click(Sender: TObject);

begin

// 执行非查询SQL

ynDataSet1.Close;

ynDataSet1.SQL.Clear;

ynDataSet1.SQL.Add('update t1 set c3=999 where c1=:c1');

ynDataSet1.Parameters.ParamByName('c1').AsInteger := 1;

ynDataSet1.ExecSQL;

end;

procedure TForm1.Button4Click(Sender: TObject);

begin

// 执行存储过程

ynDataSet1.Close;

ynDataSet1.ProcedureName := 'sp_test';

ynDataSet1.Parameters.ParamByName('@c1').AsInteger := 1;

ynDataSet1.Open;

end;

procedure TForm1.Button5Click(Sender: TObject);

begin

// 执行存储过程2

ynDataSet1.Close;

ynDataSet1.ProcedureName := 'sp_test';

ynDataSet1.Parameters.ParamByName('@c1').AsInteger := 1;

ynDataSet1.ExecProc;

end;