KbmMW本身可以用QueryService的方式进行远程数据查询,但是SmpileService同样具有很强的扩展性可以实现数据查询,下面展示两种基于SmpileService的远程数据查询方法,其原理都是利用TkbmMWSimpleService实现流的传输。

直接上代码了:

一、利用KbmMemTable:

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unit unt_service_func;
 
// =========================================================================
// kbmMW - An advanced and extendable middleware framework.
// by Components4Developers (http://www.components4developers.com)
//
// Service generated by kbmMW service wizard.
//
// INSTRUCTIONS FOR REGISTRATION/USAGE
// -----------------------------------
// Please update the uses clause of the datamodule/form the TkbmMWServer is placed on by adding
// YourServiceUnitName to it. Eg.
//
//     uses ...,kbmMWServer,YourServiceUnitName;
//
// Somewhere in your application, make sure to register the serviceclass to the TkbmMWServer instance. Eg.
//
// var
//    sd:TkbmMWCustomServiceDefinition;
// ..
//    sd:=kbmMWServer1.RegisterService(yourserviceclassname,false);
//
// Set the last parameter to true if this is the default service.
//
 
{$I kbmMW.inc}
 
interface
 
uses
  SysUtils,
{$ifdef LEVEL6}
  Variants,
{$else}
  Forms,
{$endif}
  Classes,
  kbmMWSecurity,
  kbmMWServer,
  kbmMWServiceUtils,
  kbmMWGlobal,
  kbmMWADOX,DB, ADODB,kbmMemTable, kbmMemBinaryStreamFormat;
 
type
  TkbmMWSimpleService1 = class(TkbmMWSimpleService)
  private
     { Private declarations }
  protected
     { Protected declarations }
     //新增以下函数
     function ProcessRequest(const Func:string; const ClientIdent:TkbmMWClientIdentity; const Args:array of Variant):Variant; override;
     function PerformUpdate(ClientIdent:TkbmMWClientIdentity; const Args:array of Variant):Variant; virtual;
     function PerformSelect(ClientIdent:TkbmMWClientIdentity; const Args:array of Variant):Variant; virtual;
  public
     { Public declarations }
{$IFNDEF CPP}class{$ENDIF} function GetPrefServiceName:string; override;
{$IFNDEF CPP}class{$ENDIF} function GetVersion:string; override;
{$IFNDEF CPP}class{$ENDIF} function GetFlags:TkbmMWServiceFlags; override;
  end;
 
implementation
 
uses kbmMWExceptions, unt_main, unt_dm;
 
{$R *.dfm}
 
// Service definitions.
//---------------------
 
{$IFNDEF CPP}class{$ENDIF} function TkbmMWSimpleService1.GetPrefServiceName:string;
begin
     Result:='demoservice';
end;
 
{$IFNDEF CPP}class{$ENDIF} function TkbmMWSimpleService1.GetVersion:string;
begin
     Result:='1.0';
end;
 
{$IFNDEF CPP}class{$ENDIF} function TkbmMWSimpleService1.GetFlags:TkbmMWServiceFlags;
begin
     Result:=[mwsfListed];
end;
 
function TkbmMWSimpleService1.ProcessRequest(const Func:string; const ClientIdent:TkbmMWClientIdentity; const Args:array of Variant):Variant;
var
   AFunc:string;
begin
     AFunc:=UpperCase(Func);
     if AFunc='UPDATE' then // 关联到PerformUpdate函数
        Result:=PerformUpdate(ClientIdent,Args)
     else
     if AFunc='SELECT' then // 关联到PerformSelect 函数
        Result:=PerformSelect(ClientIdent,Args)
     else Result:=inherited ProcessRequest(Func,ClientIdent,Args);
end;
 
function TkbmMWSimpleService1.PerformUpdate(ClientIdent:TkbmMWClientIdentity; const Args:array of Variant):Variant;
var
  param: string;
  aQuery: TADOQuery;
  aconn: TkbmMWADOXConnection;
begin
  Result := 0;
  param :=args[0]; //取出参数
  aQuery := TADOQuery.Create(nil);
  //从数据库连接池中取出可用链接
  aconn := TkbmMWADOXConnection(DataModule1.kbmMWADOXConnectionPool1.GetBestConnection(True,0,nil,10000));
  if aconn = nil then
  begin
    kbmMWRaiseServerException('无可用的数据库连接');
    Exit;
  end;
  aQuery.Connection := aconn.Database;
  aQuery.SQL.Text := 'update devinfo set dev_name=:param where id < 10';
  aQuery.Parameters.ParamByName('param').Value := param; //传入参数
  try
    try
      aQuery.ExecSQL;
      Result := aQuery.RowsAffected;//返回影响条数
    except
      Result := -1; //错误时返回-1
    end;
  finally
    aconn.UnlockConnection;
    aQuery.Free;
  end;
end;
 
function TkbmMWSimpleService1.PerformSelect(ClientIdent:TkbmMWClientIdentity; const Args:array of Variant):Variant;
var
  param: string;
  aQuery: TADOQuery;
  aconn: TkbmMWADOXConnection;
  memTable: TkbmMemTable; //内存表类
  aStreamFormat: TkbmBinaryStreamFormat; //流格式类
begin
  Result := 0;
  param :=args[0]; //取出参数
  aQuery := TADOQuery.Create(nil);
  //从数据库连接池中取出可用链接
  aconn := TkbmMWADOXConnection(DataModule1.kbmMWADOXConnectionPool1.GetBestConnection(True,0,nil,10000));
  if aconn = nil then
  begin
    kbmMWRaiseServerException('无可用的数据库连接');
    Exit;
  end;
  aQuery.Connection := aconn.Database;
  aQuery.SQL.Text := 'select * from devinfo where dev_name=:param';
  aQuery.Parameters.ParamByName('param').Value := param; //传入参数
  //初始化内存表
  memTable := TkbmMemTable.Create(nil);
  //初始化流格式
  aStreamFormat := TkbmBinaryStreamFormat.Create(nil);
  //内存表设置
  memTable.DefaultFormat := aStreamFormat;
  memTable.IndexFieldNames := '';
  memTable.SortFields := '';
  memTable.MasterSource := nil;
  try
    try
      aQuery.Open;
      Result := aQuery.RecordCount;//返回记录条数
      //导入结果到流
      memTable.LoadFromDataSet(aQuery,[mtcpoStructure,mtcpoProperties]);
      //格式化流
      memTable.SaveToStreamViaFormat(ResultStream,aStreamFormat);
    except
      Result := -1; //错误时返回-1
    end;
  finally
    aconn.UnlockConnection;
    aQuery.Free;
    memTable.Free;
    aStreamFormat.Free;
  end;
end;
 
end.
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unit unt_main;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs,kbmMemTable, kbmMemBinaryStreamFormat,
  kbmMWCustomTransport, kbmMWClient, kbmMWTCPIPIndyClientTransport,
  kbmMWClientDataset, kbmMWCustomConnectionPool, Grids, DBGrids, DB, StdCtrls;
 
type
  Tmainform = class(TForm)
    Edit1: TEdit;
    Button1: TButton;
    Button2: TButton;
    Label1: TLabel;
    DataSource1: TDataSource;
    DBGrid1: TDBGrid;
    kbmMWSimpleClient1: TkbmMWSimpleClient;
    kbmMWTCPIPIndyClientTransport1: TkbmMWTCPIPIndyClientTransport;
    Edit2: TEdit;
    Label2: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
  mainform: Tmainform;
  aStreamFormat: TkbmBinaryStreamFormat;
  kbmMemTable: TkbmMemTable;
 
implementation
 
{$R *.dfm}
 
procedure Tmainform.Button1Click(Sender: TObject);
var
  args: array[0..1] of Variant;
  res: Integer;
begin
  Edit2.Text := '';
  args[0]:= Edit1.Text; //参数
  res := kbmMWSimpleClient1.Request('demoservice','','SELECT',args); //发起请求
  kbmMemTable.EmptyTable; //清空内存表
  kbmMemTable.LoadFromStreamViaFormat(kbmMWSimpleClient1.ResultStream,aStreamFormat); //导入结果流
  Edit2.Text := IntToStr(res);
end;
 
procedure Tmainform.Button2Click(Sender: TObject);
var
  args: array[0..1] of Variant;
  res: Integer;
begin
  Edit2.Text := '';
  args[0]:= Edit1.Text; //参数
  res := kbmMWSimpleClient1.Request('demoservice','','UPDATE',args); //发起请求
  Edit2.Text := IntToStr(res); //返回值
end;
 
procedure Tmainform.FormCreate(Sender: TObject);
begin
  aStreamFormat := TkbmBinaryStreamFormat.Create(nil);
  kbmMemTable := TkbmMemTable.Create(nil);
  kbmMemTable.DefaultFormat := aStreamFormat;
  DataSource1.DataSet := kbmMemTable; //设置dataset为内存表
end;
 
end.

二、利用ClientDataSet:

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unit unt_service_func;
// =========================================================================
// kbmMW - An advanced and extendable middleware framework.
// by Components4Developers (http://www.components4developers.com)
//
// Service generated by kbmMW service wizard.
//
// INSTRUCTIONS FOR REGISTRATION/USAGE
// -----------------------------------
// Please update the uses clause of the datamodule/form the TkbmMWServer is placed on by adding
// YourServiceUnitName to it. Eg.
//
// uses ...,kbmMWServer,YourServiceUnitName;
//
// Somewhere in your application, make sure to register the serviceclass to the TkbmMWServer instance. Eg.
//
// var
// sd:TkbmMWCustomServiceDefinition;
// ..
// sd:=kbmMWServer1.RegisterService(yourserviceclassname,false);
//
// Set the last parameter to true if this is the default service.
//
 
{$I kbmMW.inc}
 
interface
 
uses
SysUtils,
{$ifdef LEVEL6}
Variants,
{$else}
Forms,
{$endif}
Classes,
kbmMWSecurity,
kbmMWServer,
kbmMWServiceUtils,
kbmMWGlobal,
kbmMWADOX,DB, ADODB,MidasLib,DBClient,Provider;
 
type
TkbmMWSimpleService1 = class(TkbmMWSimpleService)
private
{ Private declarations }
protected
{ Protected declarations }
//新增以下函数
function ProcessRequest(const Func:string; const ClientIdent:TkbmMWClientIdentity; const Args:array of Variant):Variant; override;
function PerformUpdate(ClientIdent:TkbmMWClientIdentity; const Args:array of Variant):Variant; virtual;
function PerformSelect(ClientIdent:TkbmMWClientIdentity; const Args:array of Variant):Variant; virtual;
public
{ Public declarations }
{$IFNDEF CPP}class{$ENDIF} function GetPrefServiceName:string; override;
{$IFNDEF CPP}class{$ENDIF} function GetVersion:string; override;
{$IFNDEF CPP}class{$ENDIF} function GetFlags:TkbmMWServiceFlags; override;
end;
 
implementation
 
uses kbmMWExceptions, unt_main, unt_dm;
 
{$R *.dfm}
 
// Service definitions.
//---------------------
 
{$IFNDEF CPP}class{$ENDIF} function TkbmMWSimpleService1.GetPrefServiceName:string;
begin
Result:='demoservice';
end;
 
{$IFNDEF CPP}class{$ENDIF} function TkbmMWSimpleService1.GetVersion:string;
begin
Result:='1.0';
end;
 
{$IFNDEF CPP}class{$ENDIF} function TkbmMWSimpleService1.GetFlags:TkbmMWServiceFlags;
begin
Result:=[mwsfListed];
end;
 
function TkbmMWSimpleService1.ProcessRequest(const Func:string; const ClientIdent:TkbmMWClientIdentity; const Args:array of Variant):Variant;
var
AFunc:string;
begin
AFunc:=UpperCase(Func);
if AFunc='UPDATE' then // 关联到PerformUpdate函数
Result:=PerformUpdate(ClientIdent,Args)
else
if AFunc='SELECT' then // 关联到PerformSelect 函数
Result:=PerformSelect(ClientIdent,Args)
else Result:=inherited ProcessRequest(Func,ClientIdent,Args);
end;
 
function TkbmMWSimpleService1.PerformUpdate(ClientIdent:TkbmMWClientIdentity; const Args:array of Variant):Variant;
var
param: string;
aQuery: TADOQuery;
aconn: TkbmMWADOXConnection;
begin
Result := 0;
param :=args[0]; //取出参数
aQuery := TADOQuery.Create(nil);
//从数据库连接池中取出可用链接
aconn := TkbmMWADOXConnection(DataModule1.kbmMWADOXConnectionPool1.GetBestConnection(True,0,nil,10000));
if aconn = nil then
begin
kbmMWRaiseServerException('无可用的数据库连接');
Exit;
end;
aQuery.Connection := aconn.Database;
aQuery.SQL.Text := 'update devinfo set dev_name=:param where id < 10';
aQuery.Parameters.ParamByName('param').Value := param; //传入参数
try
try
aQuery.ExecSQL;
Result := aQuery.RowsAffected;//返回影响条数
except
Result := -1; //错误时返回-1
end;
finally
aconn.UnlockConnection;
aQuery.Free;
end;
end;
 
function TkbmMWSimpleService1.PerformSelect(ClientIdent:TkbmMWClientIdentity; const Args:array of Variant):Variant;
var
param: string;
aQuery: TADOQuery;
aconn: TkbmMWADOXConnection;
CDS: TClientDataSet;
DSP: TDataSetProvider;
MS: TMemoryStream;
begin
Result := 0;
param :=args[0]; //取出参数
aQuery := TADOQuery.Create(nil);
//从数据库连接池中取出可用链接
aconn := TkbmMWADOXConnection(DataModule1.kbmMWADOXConnectionPool1.GetBestConnection(True,0,nil,10000));
if aconn = nil then
begin
kbmMWRaiseServerException('无可用的数据库连接');
Exit;
end;
aQuery.Connection := aconn.Database;
aQuery.SQL.Text := 'select * from devinfo where dev_name=:param';
aQuery.Parameters.ParamByName('param').Value := param; //传入参数
CDS := TClientDataSet.Create(nil);
DSP := TDataSetProvider.Create(nil);
MS := TMemoryStream.Create;
try
try
aQuery.Open;
Result := aQuery.RecordCount;//返回记录条数
DSP.DataSet := aQuery; //关联DataSet
CDS.Data := DSP.Data; //传递给ClientDataSet
CDS.SaveToStream(MS,dfBinary); //另存为内存流
MS.Position := 0;
ResultStream.LoadFromStream(MS); //导入到结果流
except
Result := -1; //错误时返回-1
end;
finally
aconn.UnlockConnection;
aQuery.Free;
CDS.Free;
DSP.Free;
MS.Free;
end;
end;
 
end.
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unit unt_main;
interface
 
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs,kbmMWCustomTransport, kbmMWClient, kbmMWTCPIPIndyClientTransport,
kbmMWClientDataset, kbmMWCustomConnectionPool, Grids, DBGrids, DB, StdCtrls,
MidasLib,DBClient;
 
type
Tmainform = class(TForm)
Edit1: TEdit;
Button1: TButton;
Button2: TButton;
Label1: TLabel;
DataSource1: TDataSource;
DBGrid1: TDBGrid;
kbmMWSimpleClient1: TkbmMWSimpleClient;
kbmMWTCPIPIndyClientTransport1: TkbmMWTCPIPIndyClientTransport;
Edit2: TEdit;
Label2: TLabel;
procedure Button1Click(Sender: TObject);
procedure FormCreate(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure FormDestroy(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
 
var
mainform: Tmainform;
CDS: TClientDataSet;
 
implementation
 
{$R *.dfm}
 
procedure Tmainform.Button1Click(Sender: TObject);
var
args: array[0..1] of Variant;
res: Integer;
begin
Edit2.Text := '';
args[0]:= Edit1.Text; //参数
res := kbmMWSimpleClient1.Request('demoservice','','SELECT',args); //发起请求
CDS.LoadFromStream(kbmMWSimpleClient1.ResultStream);//从结果流中导入
Edit2.Text := IntToStr(res);
end;
 
procedure Tmainform.Button2Click(Sender: TObject);
var
args: array[0..1] of Variant;
res: Integer;
begin
Edit2.Text := '';
args[0]:= Edit1.Text; //参数
res := kbmMWSimpleClient1.Request('demoservice','','UPDATE',args); //发起请求
Edit2.Text := IntToStr(res);
end;
 
procedure Tmainform.FormCreate(Sender: TObject);
begin
CDS := TClientDataSet.Create(nil);
DataSource1.DataSet := CDS; //设置dataset
end;
 
procedure Tmainform.FormDestroy(Sender: TObject);
begin
CDS.Free;
end;
 
end.

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