unit ScExprsDM;

interface

uses
  SysUtils, Classes, DBClient, Provider, DB, ADODB;

type
  TDMExprs = class(TDataModule)
    atExprs: TADOTable;
    dspExprs: TDataSetProvider;
    cdsOrgExprs: TClientDataSet;
    cdsOrgExprsMajorID: TIntegerField;
    cdsOrgExprsMinorID: TIntegerField;
    cdsOrgExprsRecdID: TIntegerField;
    cdsOrgExprsExprs: TWideStringField;
    cdsOrgExprsFlag: TIntegerField;
    cdsOrgExprsExprsValue: TFloatField;
    cdsOrgExprsExprs2: TWideStringField;
    cdsOrgExprsExprs3: TWideStringField;
    cdsOrgExprsExprs4: TWideStringField;
    cdsOrgExprsExprs1: TWideStringField;
    cdsExprs: TClientDataSet;
    cdsExprsMajorID: TIntegerField;
    cdsExprsMinorID: TIntegerField;
    cdsExprsRecdID: TIntegerField;
    cdsExprsExprs: TWideStringField;
    cdsExprsFlag: TIntegerField;
    cdsExprsExprsValue: TFloatField;
    cdsExprsExprs1: TWideStringField;
    cdsExprsExprs2: TWideStringField;
    cdsExprsExprs3: TWideStringField;
    cdsExprsExprs4: TWideStringField;
    procedure cdsOrgExprsAfterOpen(DataSet: TDataSet);
  private
    procedure UpdateOldData;

    function GetConnection: TADOConnection;
    procedure SetConnection(const Value: TADOConnection);
  public
    procedure Save;
    procedure AddExprs(MajorID, MinorID, RecdID: Integer;
      const Expression: string; Value: Variant; Flag: Integer; AIndex: Integer = 0);
    procedure Delete(MajorID, RecdID: Integer); overload;
    procedure Delete(MajorID, MinorID, RecdID: Integer); overload;      
    function GetExprs(MajorID, MinorID, RecdID: Integer; AIndex: Integer = 0): string;

    property Connection: TADOConnection read GetConnection write SetConnection;
  end;


implementation

{$R *.dfm}

uses ConstVarUnit, Math;

{ TDMExprs }

procedure TDMExprs.AddExprs(MajorID, MinorID, RecdID: Integer;
  const Expression: string; Value: Variant; Flag, AIndex: Integer);
begin
  if cdsExprs.FindKey([MajorID, MinorID, RecdID]) then
    cdsExprs.Edit
  else
    cdsExprs.Insert;

  cdsExprsMajorID.Value := MajorID;
  cdsExprsMinorID.Value := MinorID;
  cdsExprsRecdID.Value := RecdID;
  case AIndex of
    0: cdsExprsExprs.Value := Expression;
    1: cdsExprsExprs1.Value := Expression;
    2: cdsExprsExprs2.Value := Expression;
    3: cdsExprsExprs3.Value := Expression;
    4: cdsExprsExprs4.Value := Expression;
  end;
  cdsExprsFlag.Value := Flag;
  cdsExprsExprsValue.Value := Value;
  cdsExprs.Post;
end;

procedure TDMExprs.Delete(MajorID, RecdID: Integer);
begin
  cdsOrgExprs.SetRange([MajorID, RecdID], [MajorID, RecdID]);
  cdsOrgExprs.First;
  while not cdsOrgExprs.Eof do cdsOrgExprs.Delete;
  cdsOrgExprs.CancelRange;
end;

procedure TDMExprs.Delete(MajorID, MinorID, RecdID: Integer);
begin
  if cdsExprs.FindKey([MajorID, MinorID, RecdID]) then
    cdsExprs.Delete;
end;

function TDMExprs.GetConnection: TADOConnection;
begin
  Result := atExprs.Connection;
end;

function TDMExprs.GetExprs(MajorID, MinorID, RecdID,
  AIndex: Integer): string;
begin
  if cdsExprs.FindKey([MajorID, MinorID, RecdID]) then
  begin
    case AIndex of
      0: Result := cdsExprsExprs.Value;
      1: Result := cdsExprsExprs1.Value;
      2: Result := cdsExprsExprs2.Value;
      3: Result := cdsExprsExprs3.Value;
      4: Result := cdsExprsExprs4.Value;
      else Result := '';
    end;
  end;
end;

procedure TDMExprs.Save;
begin
  cdsOrgExprs.ApplyUpdates(0);
end;

procedure TDMExprs.SetConnection(const Value: TADOConnection);
begin
  atExprs.Connection := Value;
  if Assigned(Value) then
  begin
    cdsOrgExprs.Active := True;
    cdsOrgExprs.IndexFieldNames := SMajorRecdID;
  end;
end;

procedure TDMExprs.cdsOrgExprsAfterOpen(DataSet: TDataSet);
begin
  cdsExprs.CloneCursor(cdsOrgExprs, True);
  cdsExprs.IndexFieldNames := SMajorMinorRecdID;

  UpdateOldData;
end;

procedure TDMExprs.UpdateOldData;
begin
  cdsExprs.First;
  while not cdsExprs.Eof do
  begin
    if (cdsExprsMajorID.AsInteger = Exprs_Qty_ID) and (cdsExprsMinorID.AsInteger = Exprs_DQty_ID) then
    begin
      cdsExprs.Edit;
      cdsExprsMinorID.AsInteger := Exprs_DQty_ID;
      cdsExprs.Post;
    end;
    if (cdsExprsMajorID.AsInteger = Exprs_Qty_ID) and (cdsExprsMinorID.AsInteger = Exprs_DQty2_ID) then
    begin
      cdsExprs.Edit;
      cdsExprsMinorID.AsInteger := Exprs_DQty2_ID;
      cdsExprs.Post;
    end;
  end;
end;

end.