frxcustomdbrtti.pas

这个是功能强大的报表软件

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

unit frxCustomDBRTTI;

interface

{$I frx.inc}

implementation

uses
  Windows, Classes, SysUtils, Forms, DB, fs_iinterpreter, frxClass, frxCustomDB,
  frxDBSet, fs_idbrtti
{$IFDEF Delphi6}
, Variants
{$ENDIF};


type
  TFunctions = class(TfsRTTIModule)
  private
    function CallMethod(Instance: TObject; ClassType: TClass;
      const MethodName: String; Caller: TfsMethodHelper): Variant;
    function GetProp(Instance: TObject; ClassType: TClass;
      const PropName: String): Variant;
    procedure SetProp(Instance: TObject; ClassType: TClass;
      const PropName: String; Value: Variant);
  public
    constructor Create(AScript: TfsScript); override;
  end;


{ TFunctions }

constructor TFunctions.Create(AScript: TfsScript);
begin
  inherited Create(AScript);
  with AScript do
  begin
    with AddClass(TfrxDBDataset, 'TfrxCustomDBDataSet') do
    begin
      AddMethod('function Locate(const KeyFields: string; const KeyValues: Variant;' +
        'Options: TLocateOptions): Boolean', CallMethod);
      AddMethod('function IsEmpty: Boolean', CallMethod);
      AddMethod('function RecordCount: Integer', CallMethod);
    end;
    AddClass(TfrxCustomDatabase, 'TfrxComponent');
    with AddClass(TfrxCustomDataset, 'TfrxDBDataSet') do
    begin
      AddMethod('procedure Last', CallMethod);
      AddMethod('function FieldByName(Name: String): TField', CallMethod);
      AddProperty('DataSet', 'TDataSet', GetProp, nil);
      AddProperty('Active', 'Boolean', GetProp, SetProp);
      AddProperty('Fields', 'TFields', GetProp, nil);
    end;
    AddClass(TfrxCustomTable, 'TfrxCustomDataset');
    with AddClass(TfrxParamItem, 'TCollectionItem') do
      AddProperty('Value', 'Variant', GetProp, SetProp);
    with AddClass(TfrxParams, 'TCollection') do
    begin
      AddMethod('function IndexOf(Name: String): Integer', CallMethod);
      AddDefaultProperty('Items', 'Integer', 'TfrxParamItem', CallMethod, True);
    end;
    with AddClass(TfrxCustomQuery, 'TfrxCustomDataset') do
      AddMethod('function ParamByName(Name: string): TfrxParamItem', CallMethod);
    with AddClass(TfrxDBLookupComboBox, 'TfrxDialogControl') do
    begin
      AddProperty('KeyValue', 'Variant', GetProp, SetProp);
      AddProperty('Text', 'String', GetProp, nil);
    end;
  end;
end;

function TFunctions.CallMethod(Instance: TObject; ClassType: TClass;
  const MethodName: String; Caller: TfsMethodHelper): Variant;

  function IntToLocateOptions(i: Integer): TLocateOptions;
  begin
    Result := [];
    if (i and 1) <> 0 then
      Result := Result + [loCaseInsensitive];
    if (i and 2) <> 0 then
      Result := Result + [loPartialKey];
  end;

begin
  Result := 0;

  if ClassType = TfrxParams then
  begin
    if MethodName = 'INDEXOF' then
      Result := TfrxParams(Instance).IndexOf(Caller.Params[0])
    else if MethodName = 'ITEMS.GET' then
      Result := Integer(TfrxParams(Instance).Items[Caller.Params[0]])
  end
  else if ClassType = TfrxDBDataset then
  begin
    if MethodName = 'LOCATE' then
      Result := TfrxDBDataSet(Instance).GetDataSet.Locate(Caller.Params[0], Caller.Params[1], IntToLocateOptions(Caller.Params[2]))
    else if MethodName = 'ISEMPTY' then
      Result := TfrxDBDataSet(Instance).GetDataSet.IsEmpty
    else if MethodName = 'RECORDCOUNT' then
      Result := TfrxDBDataSet(Instance).GetDataSet.RecordCount
  end
  else if ClassType = TfrxCustomDataSet then
  begin
    if MethodName = 'LAST' then
      TfrxCustomDataSet(Instance).GetDataSet.Last
    else if MethodName = 'FIELDBYNAME' then
      Result := Integer(TfrxCustomDataset(Instance).GetDataSet.FieldByName(Caller.Params[0]))
  end
  else if ClassType = TfrxCustomQuery then
  begin
    if MethodName = 'PARAMBYNAME' then
      Result := Integer(TfrxCustomQuery(Instance).ParamByName(Caller.Params[0]))
  end
end;

function TFunctions.GetProp(Instance: TObject; ClassType: TClass;
  const PropName: String): Variant;
begin
  Result := 0;

  if ClassType = TfrxCustomDataset then
  begin
    if PropName = 'DATASET' then
      Result := Integer(TfrxCustomDataset(Instance).DataSet)
    else if PropName = 'ACTIVE' then
      Result := TfrxCustomDataset(Instance).Active
    else if PropName = 'FIELDS' then
      Result := Integer(TfrxCustomDataset(Instance).Fields)
  end
  else if ClassType = TfrxParamItem then
  begin
    if PropName = 'VALUE' then
      Result := TfrxParamItem(Instance).Value
  end
  else if ClassType = TfrxDBLookupComboBox then
  begin
    if PropName = 'KEYVALUE' then
      Result := TfrxDBLookupComboBox(Instance).KeyValue
    else if PropName = 'TEXT' then
      Result := TfrxDBLookupComboBox(Instance).Text
  end
end;

procedure TFunctions.SetProp(Instance: TObject; ClassType: TClass;
  const PropName: String; Value: Variant);
begin
  if ClassType = TfrxCustomDataset then
  begin
    if PropName = 'ACTIVE' then
      TfrxCustomDataset(Instance).Active := Value;
  end
  else if ClassType = TfrxParamItem then
  begin
    if PropName = 'VALUE' then
      TfrxParamItem(Instance).Value := Value
  end
  else if ClassType = TfrxDBLookupComboBox then
  begin
    if PropName = 'KEYVALUE' then
      TfrxDBLookupComboBox(Instance).KeyValue := Value
  end
end;


initialization
  fsRTTIModules.Add(TFunctions);

finalization
  if fsRTTIModules <> nil then
    fsRTTIModules.Remove(TFunctions);

end.


//