Delphi 三层框架开发 服务端开发

采用Delphi7+SQL2008

一、创建数据库和表

CREATE TABLE [dbo].[tb_Department](
	[FKey] [uniqueidentifier] NOT NULL,
	[FName] [varchar](50) NULL,
	[FAge] [varchar](50) NULL,
	[FSex] [varchar](50) NULL,
	[FMobile] [varchar](50) NULL,
	[FRemark] [varchar](200) NULL
) ON [PRIMARY]

二、写服务端

2.1 先创建一个application

在窗体中添加Label如图显示

unit ufrmMain;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TfrmMain = class(TForm)
    lbl1: TLabel;
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  frmMain: TfrmMain;

implementation

{$R *.dfm}

end.

2.2 File-New-Other 

点击OK  在弹出的对话框中  填写

名字自己根据需要 填写

此时生成2个单元 一个Project1_TLB 和 Unit2 单元

打开Project1_TLB 单元  按F12键

在弹出的对话框中

Name就是我们要的方法名称（根据自己需要填写）GetData 获取数据

新增参数  如下图 

 

再按相同的方法 添加PostData方法（保存数据）

最终结果如下图

添加后的最代码终结果

unit Project1_TLB;

// ************************************************************************ //
// WARNING                                                                    
// -------                                                                    
// The types declared in this file were generated from data read from a       
// Type Library. If this type library is explicitly or indirectly (via        
// another type library referring to this type library) re-imported, or the   
// 'Refresh' command of the Type Library Editor activated while editing the   
// Type Library, the contents of this file will be regenerated and all        
// manual modifications will be lost.                                         
// ************************************************************************ //

// PASTLWTR : 1.2
// File generated on 2014-10-24 14:24:49 from Type Library described below.

// ************************************************************************  //
// Type Lib: D:\Delphi7\Projects\Project1.tlb (1)
// LIBID: {C6713A20-F49B-4B06-8869-9E040C912074}
// LCID: 0
// Helpfile: 
// HelpString: Project1 Library
// DepndLst: 
//   (1) v2.0 stdole, (C:\Windows\SysWOW64\stdole2.tlb)
//   (2) v1.0 Midas, (C:\Windows\SysWOW64\midas.dll)
//   (3) v4.0 StdVCL, (C:\Windows\SysWOW64\stdvcl40.dll)
// ************************************************************************ //
{$TYPEDADDRESS OFF} // Unit must be compiled without type-checked pointers. 
{$WARN SYMBOL_PLATFORM OFF}
{$WRITEABLECONST ON}
{$VARPROPSETTER ON}
interface

uses Windows, ActiveX, Classes, Graphics, Midas, StdVCL, Variants;
  

// *********************************************************************//
// GUIDS declared in the TypeLibrary. Following prefixes are used:        
//   Type Libraries     : LIBID_xxxx                                      
//   CoClasses          : CLASS_xxxx                                      
//   DISPInterfaces     : DIID_xxxx                                       
//   Non-DISP interfaces: IID_xxxx                                        
// *********************************************************************//
const
  // TypeLibrary Major and minor versions
  Project1MajorVersion = 1;
  Project1MinorVersion = 0;

  LIBID_Project1: TGUID = '{C6713A20-F49B-4B06-8869-9E040C912074}';

  IID_ITestService: TGUID = '{C59D7F3C-4AE7-473B-81B8-8EE1C73BB2B1}';
  CLASS_TestService: TGUID = '{82AEC5B8-E53F-4725-A24D-456FD570E355}';
type

// *********************************************************************//
// Forward declaration of types defined in TypeLibrary                    
// *********************************************************************//
  ITestService = interface;
  ITestServiceDisp = dispinterface;

// *********************************************************************//
// Declaration of CoClasses defined in Type Library                       
// (NOTE: Here we map each CoClass to its Default Interface)              
// *********************************************************************//
  TestService = ITestService;


// *********************************************************************//
// Interface: ITestService
// Flags:     (4416) Dual OleAutomation Dispatchable
// GUID:      {C59D7F3C-4AE7-473B-81B8-8EE1C73BB2B1}
// *********************************************************************//
  ITestService = interface(IAppServer)
    ['{C59D7F3C-4AE7-473B-81B8-8EE1C73BB2B1}']
    procedure GetData(const Table: WideString; const Where: WideString; var Ret: OleVariant); safecall;
    procedure PostData(const Table: WideString; Value: OleVariant; var Ret: OleVariant); safecall;
  end;

// *********************************************************************//
// DispIntf:  ITestServiceDisp
// Flags:     (4416) Dual OleAutomation Dispatchable
// GUID:      {C59D7F3C-4AE7-473B-81B8-8EE1C73BB2B1}
// *********************************************************************//
  ITestServiceDisp = dispinterface
    ['{C59D7F3C-4AE7-473B-81B8-8EE1C73BB2B1}']
    procedure GetData(const Table: WideString; const Where: WideString; var Ret: OleVariant); dispid 301;
    procedure PostData(const Table: WideString; Value: OleVariant; var Ret: OleVariant); dispid 302;
    function AS_ApplyUpdates(const ProviderName: WideString; Delta: OleVariant; MaxErrors: Integer; 
                             out ErrorCount: Integer; var OwnerData: OleVariant): OleVariant; dispid 20000000;
    function AS_GetRecords(const ProviderName: WideString; Count: Integer; out RecsOut: Integer; 
                           Options: Integer; const CommandText: WideString; var Params: OleVariant; 
                           var OwnerData: OleVariant): OleVariant; dispid 20000001;
    function AS_DataRequest(const ProviderName: WideString; Data: OleVariant): OleVariant; dispid 20000002;
    function AS_GetProviderNames: OleVariant; dispid 20000003;
    function AS_GetParams(const ProviderName: WideString; var OwnerData: OleVariant): OleVariant; dispid 20000004;
    function AS_RowRequest(const ProviderName: WideString; Row: OleVariant; RequestType: Integer; 
                           var OwnerData: OleVariant): OleVariant; dispid 20000005;
    procedure AS_Execute(const ProviderName: WideString; const CommandText: WideString; 
                         var Params: OleVariant; var OwnerData: OleVariant); dispid 20000006;
  end;

// *********************************************************************//
// The Class CoTestService provides a Create and CreateRemote method to          
// create instances of the default interface ITestService exposed by              
// the CoClass TestService. The functions are intended to be used by             
// clients wishing to automate the CoClass objects exposed by the         
// server of this typelibrary.                                            
// *********************************************************************//
  CoTestService = class
    class function Create: ITestService;
    class function CreateRemote(const MachineName: string): ITestService;
  end;

implementation

uses ComObj;

class function CoTestService.Create: ITestService;
begin
  Result := CreateComObject(CLASS_TestService) as ITestService;
end;

class function CoTestService.CreateRemote(const MachineName: string): ITestService;
begin
  Result := CreateRemoteComObject(MachineName, CLASS_TestService) as ITestService;
end;

end.

Unit2单元成功 添加以下

前面新增了2个接口方法 然后我们在这个单元里面  实现  方便客户端调用  

代码如下

unit Unit2;

{$WARN SYMBOL_PLATFORM OFF}

interface

uses
  Windows, Messages, SysUtils, Classes, ComServ, ComObj, VCLCom, DataBkr,
  DBClient, Project1_TLB, StdVcl, ADODB, Provider, DB;

type
  TTestService = class(TRemoteDataModule, ITestService)
    conData: TADOConnection;
    dsTemp: TClientDataSet;
    dspTemp: TDataSetProvider;
    qryTemp: TADOQuery;
    procedure RemoteDataModuleCreate(Sender: TObject);
  private
    I: Integer;
    Params: OleVariant;
    OwnerData: OleVariant;
    // 自己加入
    function InnerGetData(strSQL: String): OleVariant;
    function InnerPostData(Delta: OleVariant): Integer;
  protected
    class procedure UpdateRegistry(Register: Boolean; const ClassID, ProgID: string); override;
    procedure GetData(const Table, Where: WideString; var Ret: OleVariant);
      safecall;
    procedure PostData(const Table: WideString; Value: OleVariant;
      var Ret: OleVariant); safecall;

  public
    { Public declarations }
  end;

implementation

{$R *.DFM}

procedure TTestService.GetData(const Table, Where: WideString;
  var Ret: OleVariant);
const SQL = 'select * from %s where %s';
begin
  Ret := Self.InnerGetData(Format(SQL, [Table, Where]));
end;


function TTestService.InnerGetData(strSQL: String): OleVariant;
begin
    // 必须是CLOSE状态, 否则报错.
  if qryTemp.Active then qryTemp.Active := False;
  Result := Self.AS_GetRecords('dspTemp', -1, I, ResetOption+MetaDataOption,
    strSQL, Params, OwnerData);
end;

function TTestService.InnerPostData(Delta: OleVariant): Integer;
begin
  Self.AS_ApplyUpdates('dspTemp', Delta, 0, Result, OwnerData);
end;

procedure TTestService.PostData(const Table: WideString; Value: OleVariant;
  var Ret: OleVariant);
var
  KeyField: TField;
begin
  dsTemp.Data := Value;
  if dsTemp.IsEmpty then Exit;
  {
    这里假设每个表都有一个FKey字段, 并且值是唯一的.
    也可以根据表中, 改成相应的主键字段名.
  }
  KeyField := dsTemp.FindField('FKey');
  if KeyField=nil then raise Exception.Create(' 键值字段未发现.');
  if KeyField.IsNull then
  begin
    qryTemp.SQL.Text := 'select * from '+Table+' where 1>2';
  end
  else
  begin
    qryTemp.SQL.Text := 'select * from '+Table+' where FKey='+QuotedStr(KeyField.AsString);
    qryTemp.Open;
    with qryTemp.FieldByName('FKey') do ProviderFlags := ProviderFlags + [pfInKey];
    dspTemp.UpdateMode := upWhereKeyOnly;
  end;
  qryTemp.Open;
  Ret := InnerPostData(Value);
end;

class procedure TTestService.UpdateRegistry(Register: Boolean; const ClassID, ProgID: string);
begin
  if Register then
  begin
    inherited UpdateRegistry(Register, ClassID, ProgID);
    EnableSocketTransport(ClassID);
    EnableWebTransport(ClassID);
  end else
  begin
    DisableSocketTransport(ClassID);
    DisableWebTransport(ClassID);
    inherited UpdateRegistry(Register, ClassID, ProgID);
  end;
end;



procedure TTestService.RemoteDataModuleCreate(Sender: TObject);
begin
 Self.qryTemp.Connection := Self.conData;
  Self.dspTemp.DataSet := Self.qryTemp;
  Self.dspTemp.Options := Self.dspTemp.Options + [poAllowCommandText];
  conData.ConnectionString:='File Name='+ExtractFilePath(ParamStr(0))+'conData.udl';
 try
  Self.conData.Open;
  except
    on e:Exception do
    begin
      
    end;
 end;
end;

initialization
  TComponentFactory.Create(ComServer, TTestService,
    Class_TestService, ciMultiInstance, tmApartment);
end.

再讲讲conData.udl  文件的创建

新建一个txt文件   

添加 内容

[oledb]
; Everything after this line is an OLE DB initstring
Provider=SQLOLEDB.1;Password=test;Persist Security Info=True;User ID=sa;Initial Catalog=db_test;Data Source=192.168.0.1

保存  修改扩展名 为.udl  就可以了。

到此 服务端写完了

开始写客户端程序之前( 先启动scktsrvr.exe   此 在dephi程序的bin目录下  ) 然后   启动服务端 

如果不想在客户的机器上注册midas.dll 请在使用ClientDataSet单元中 引用 MidasLib 单元

项目源码下载 —— http://download.csdn.net/detail/gykthh/8077801