面向过程的ado建造者模式

{*******************************************************}
{                                                       }
{       ADO数据工厂                                     }
{                                                       }
{       版权所有 (C) 2008 咏南工作室                    }
{                                                       }
{*******************************************************}

unit uDataFactory;

interface

uses
  SysUtils,ADODB,DB,Classes,uCommFunc,ActiveX;

{ 生成连接对象 }
function GetADOConn(Owner:TComponent;AProvider:Integer=1):TADOConnection;
{ 生成数据集对象 }
function GetADODataSet(Owner:TComponent;AConn:TADOConnection;ASQL:string):TDataSet;
{ 执行事务性SQL }
procedure UpdateADODataSet(Owner:TComponent;AConn:TADOConnection;ASQL:string);
{ 生成DataSource对象 }
function GetDataSource(Owner:TComponent):TDataSource;
{ 数据绑定 }
procedure LinkControl(ADataSet:TDataSet;ADataSource:TDataSource);

implementation

function GetDataSource(Owner:TComponent):TDataSource;
var
  FDataSource:TDataSource;
begin
  FDataSource:=TDataSource.Create(Owner);
  Result:=FDataSource;
end; 

procedure LinkControl(ADataSet:TDataSet;ADataSource:TDataSource);
begin
  ADataSource.DataSet:=ADataSet;
end; 

//==============================================================================
// AProvider=1 sql Server: 'sqloledb'
// AProvider=2 Access: 'Microsoft.Jet.OLEDB.4.0'
//==============================================================================

function GetADOConn(Owner:TComponent;AProvider:Integer=1):TADOConnection;
var
  Conn:TADOConnection;
  sFileName,sSection:string;
begin
  sFileName:=GetINIFile;
  Conn:=TADOConnection.Create(Owner);
  with Conn do
  begin
    LoginPrompt:=False;
    if AProvider=1 then
    begin
      Provider:='sqloledb';
      sSection:='sql server';
      Properties['Data Source'].Value:=ReadIniFile(sFileName,sSection,'server','');
      Properties['User ID'].Value:=ReadIniFile(sFileName,sSection,'userid','');
      Properties['Password'].Value:=ReadIniFile(sFileName,sSection,'password','');
      Properties['Initial Catalog'].Value:=ReadIniFile(sFileName,sSection,'database','');
    end;
    if aprovider=2 then
    begin
      Provider:='microsoft.jet.oledb.4.0';
      sSection:='access';
      Properties['Jet OLEDB:Database Password'].Value:=ReadIniFile(sFileName,sSection,'database password','');
      Properties['Data Source'].Value:=ReadIniFile(sFileName,sSection,'server','');
      Properties['User ID'].Value:=ReadIniFile(sFileName,sSection,'userid','');
      Properties['Password'].Value:=ReadIniFile(sFileName,sSection,'password','');
    end; 
    try
      open;
      Result:=Conn;
    except
      raise Exception.Create('数据库连接失败');
    end;
  end;
end;

function GetADODataSet(Owner:TComponent;AConn:TADOConnection;ASQL:string):TDataSet;
var
  DataSet:TADODataSet;
begin
  dataset:=TADODataSet.Create(owner);
  dataset.Connection:=aconn;
  with dataset do
  begin
    Close;
    CommandText:='';
    CommandText:=ASQL;
    Open;
  end;
  Result:=DataSet;
end; 

procedure UpdateADODataSet(Owner:TComponent;AConn:TADOConnection;ASQL:string);
var
  FDataSet:TADOCommand;
begin
  FDataSet:=TADOCommand.Create(Owner);
  FDataSet.Connection:=AConn;
  AConn.BeginTrans;
  try
    with FDataSet do
    begin
      CommandText:='';
      CommandText:=ASQL;
      Execute;
    end; 
    AConn.CommitTrans;
  except
    AConn.RollbackTrans;
  end;
end; 

end.