frxdbxcomponents.pas

这个是功能强大的报表软件

{******************************************}
{                                          }
{             FastReport v4.0              }
{         DBX enduser components           }
{                                          }
{         Copyright (c) 1998-2008          }
{         by Alexander Tzyganenko,         }
{            Fast Reports Inc.             }
{                                          }
{******************************************}

unit frxDBXComponents;

interface

{$I frx.inc}

uses
  Windows, Classes, frxClass, frxCustomDB, DB, DBXpress, SqlExpr,
  Provider, DBClient
{$IFDEF Delphi6}
, Variants
{$ENDIF}
{$IFDEF QBUILDER}
, fqbClass
{$ENDIF};


type
  TfrxDBXDataset = class(TCustomClientDataset)
  private
    FDataSet: TDataSet;
    FProvider: TDataSetProvider;
    procedure SetDataset(const Value: TDataset);
  protected
    procedure OpenCursor(InfoQuery: Boolean); override;
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
    property Dataset: TDataset read FDataset write SetDataset;
  end;

  TfrxDBXComponents = class(TfrxDBComponents)
  private
    FDefaultDatabase: TSQLConnection;
    FOldComponents: TfrxDBXComponents;
  protected
    procedure Notification(AComponent: TComponent; Operation: TOperation); override;
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
    function GetDescription: String; override;
  published
    property DefaultDatabase: TSQLConnection read FDefaultDatabase write FDefaultDatabase;
  end;

  TfrxDBXDatabase = class(TfrxCustomDatabase)
  private
    FDatabase: TSQLConnection;
    FStrings: TStrings;
    FLock: Boolean;
    function GetDriverName: String;
    function GetGetDriverFunc: String;
    function GetLibraryName: String;
    function GetVendorLib: String;
    procedure SetDriverName(const Value: String);
    procedure SetGetDriverFunc(const Value: String);
    procedure SetLibraryName(const Value: String);
    procedure SetVendorLib(const Value: String);
    procedure OnChange(Sender: TObject);
  protected
    procedure SetConnected(Value: Boolean); override;
    procedure SetDatabaseName(const Value: String); override;
    procedure SetLoginPrompt(Value: Boolean); override;
    procedure SetParams(Value: TStrings); override;
    function GetConnected: Boolean; override;
    function GetDatabaseName: String; override;
    function GetLoginPrompt: Boolean; override;
    function GetParams: TStrings; override;
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
    class function GetDescription: String; override;
    property Database: TSQLConnection read FDatabase;
  published
    property ConnectionName: String read GetDatabaseName write SetDatabaseName;
    property DriverName: String read GetDriverName write SetDriverName;
    property GetDriverFunc: String read GetGetDriverFunc write SetGetDriverFunc;
    property LibraryName: String read GetLibraryName write SetLibraryName;
    property LoginPrompt;
    property Params;
    property VendorLib: String read GetVendorLib write SetVendorLib;
    property Connected;
  end;

  TfrxDBXTable = class(TfrxCustomTable)
  private
    FDatabase: TfrxDBXDatabase;
    FTable: TSQLTable;
    procedure SetDatabase(const Value: TfrxDBXDatabase);
  protected
    procedure Notification(AComponent: TComponent; Operation: TOperation); override;
    procedure SetMaster(const Value: TDataSource); override;
    procedure SetMasterFields(const Value: String); override;
    procedure SetIndexName(const Value: String); override;
    procedure SetIndexFieldNames(const Value: String); override;
    procedure SetTableName(const Value: String); override;
    function GetIndexName: String; override;
    function GetIndexFieldNames: String; override;
    function GetTableName: String; override;
  public
    constructor Create(AOwner: TComponent); override;
    constructor DesignCreate(AOwner: TComponent; Flags: Word); override;
    destructor Destroy; override;
    class function GetDescription: String; override;
    procedure BeforeStartReport; override;
    property Table: TSQLTable read FTable;
  published
    property Database: TfrxDBXDatabase read FDatabase write SetDatabase;
  end;

  TfrxDBXQuery = class(TfrxCustomQuery)
  private
    FDatabase: TfrxDBXDatabase;
    FQuery: TSQLQuery;
    FStrings: TStrings;
    FLock: Boolean;
    procedure SetDatabase(const Value: TfrxDBXDatabase);
  protected
    procedure Notification(AComponent: TComponent; Operation: TOperation); override;
    procedure SetMaster(const Value: TDataSource); override;
    procedure SetSQL(Value: TStrings); override;
    function GetSQL: TStrings; override;
    procedure OnChangeSQL(Sender: TObject); override;
  public
    constructor Create(AOwner: TComponent); override;
    constructor DesignCreate(AOwner: TComponent; Flags: Word); override;
    destructor Destroy; override;
    class function GetDescription: String; override;
    procedure BeforeStartReport; override;
    procedure UpdateParams; override;
{$IFDEF QBUILDER}
    function QBEngine: TfqbEngine; override;
{$ENDIF}
    property Query: TSQLQuery read FQuery;
  published
    property Database: TfrxDBXDatabase read FDatabase write SetDatabase;
  end;

{$IFDEF QBUILDER}
  TfrxEngineDBX = class(TfqbEngine)
  private
    FQuery: TSQLQuery;
    FDBXDataset: TfrxDBXDataset;
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
    procedure ReadTableList(ATableList: TStrings); override;
    procedure ReadFieldList(const ATableName: string; var AFieldList: TfqbFieldList); override;
    function ResultDataSet: TDataSet; override;
    procedure SetSQL(const Value: string); override;
  end;
{$ENDIF}

var
  DBXComponents: TfrxDBXComponents;


implementation

uses
  frxDBXRTTI,
{$IFNDEF NO_EDITORS}
  frxDBXEditor,
{$ENDIF}
  frxDsgnIntf, frxRes;

type
  THackSQLConnection = class(TSQLConnection);


{ TfrxDBXDataset }

constructor TfrxDBXDataset.Create(AOwner: TComponent);
begin
  inherited;
  FProvider := TDatasetProvider.Create(nil);
end;

destructor TfrxDBXDataset.Destroy;
begin
  FProvider.Free;
  inherited;
end;

procedure TfrxDBXDataset.OpenCursor(InfoQuery: Boolean);
begin
  SetProvider(FProvider);
  inherited;
end;

procedure TfrxDBXDataset.SetDataset(const Value: TDataset);
begin
  FDataset := Value;
  FProvider.Dataset := FDataset;
end;


{ TfrxDBXComponents }

constructor TfrxDBXComponents.Create(AOwner: TComponent);
begin
  inherited;
  FOldComponents := DBXComponents;
  DBXComponents := Self;
end;

destructor TfrxDBXComponents.Destroy;
begin
  if DBXComponents = Self then
    DBXComponents := FOldComponents;
  inherited;
end;

function TfrxDBXComponents.GetDescription: String;
begin
  Result := 'DBX';
end;

procedure TfrxDBXComponents.Notification(AComponent: TComponent;
  Operation: TOperation);
begin
  inherited;
  if (AComponent = FDefaultDatabase) and (Operation = opRemove) then
    FDefaultDatabase := nil;
end;


{ TfrxDBXDatabase }

constructor TfrxDBXDatabase.Create(AOwner: TComponent);
begin
  inherited;
  FStrings := TStringList.Create;
  TStringList(FStrings).OnChange := OnChange;
  FDatabase := TSQLConnection.Create(nil);
// set ComponentState := csDesigning to obtain Params automatically
  THackSQLConnection(FDataBase).SetDesigning(True, False);
  Component := FDatabase;
end;

destructor TfrxDBXDatabase.Destroy;
begin
  FStrings.Free;
  inherited;
end;

class function TfrxDBXDatabase.GetDescription: String;
begin
  Result := frxResources.Get('obDBXDB');
end;

function TfrxDBXDatabase.GetConnected: Boolean;
begin
  Result := FDatabase.Connected;
end;

function TfrxDBXDatabase.GetDatabaseName: String;
begin
  Result := FDatabase.ConnectionName;
end;

function TfrxDBXDatabase.GetDriverName: String;
begin
  Result := FDatabase.DriverName;
end;

function TfrxDBXDatabase.GetGetDriverFunc: String;
begin
  Result := FDatabase.GetDriverFunc;
end;

function TfrxDBXDatabase.GetLibraryName: String;
begin
  Result := FDatabase.LibraryName;
end;

function TfrxDBXDatabase.GetLoginPrompt: Boolean;
begin
  Result := FDatabase.LoginPrompt;
end;

function TfrxDBXDatabase.GetParams: TStrings;
begin
  FLock := True;
  FStrings.Assign(FDatabase.Params);
  FLock := False;
  Result := FStrings;
end;

function TfrxDBXDatabase.GetVendorLib: String;
begin
  Result := FDatabase.VendorLib;
end;

procedure TfrxDBXDatabase.SetConnected(Value: Boolean);
begin
  BeforeConnect(Value);
  FDatabase.Connected := Value;
end;

procedure TfrxDBXDatabase.SetDatabaseName(const Value: String);
begin
  FDatabase.ConnectionName := Value;
end;

procedure TfrxDBXDatabase.SetDriverName(const Value: String);