rm_dbrel.pas

来自「进销存·完整的·有数据库的·非常完整·只得参考」· PAS 代码 · 共 86 行

{*****************************************}
{                                         }
{          Report Machine v2.0            }
{             DB related stuff            }
{                                         }
{*****************************************}

unit RM_dbrel;

interface

{$I RM.inc}

uses
  SysUtils, Windows, Messages, Classes, DB
{$IFDEF Delphi2}
  , DBTables, BDE
{$ENDIF};

function RMIsBlob(Field: TField): Boolean;
function RMIsBookmarksEqual(DataSet: TDataSet; b1, b2: TBookmark): Boolean;
procedure RMAssignBlobTo(Blob: TField; Obj: TObject);
procedure RMGetFieldNames(DataSet: TDataSet; List: TStrings);
procedure RMDisableDBControls(aDataSet: TDataSet);
procedure RMEnableDBControls(aDataSet: TDataSet);

implementation

function RMIsBlob(Field: TField): Boolean;
begin
  Result := (Field <> nil) and (Field.DataType in [ftBlob..ftTypedBinary]);
end;

procedure RMAssignBlobTo(Blob: TField; Obj: TObject);
begin
  if Obj is TPersistent then
    TPersistent(Obj).Assign(Blob)
  else if Obj is TStream then
  begin
    TBlobField(Blob).SaveToStream(TStream(Obj));
    TStream(Obj).Position := 0;
  end;
end;

{$HINTS OFF}
procedure RMGetFieldNames(DataSet: TDataSet; List: TStrings);
var
  i: Integer;
begin
  try
    DataSet.GetFieldNames(List);
  except;
  end;
end;
{$HINTS ON}

function RMIsBookmarksEqual(DataSet: TDataSet; b1, b2: TBookmark): Boolean;
{$IFDEF Delphi2}
var
  n: Integer;
{$ENDIF}
begin
{$IFDEF Delphi2}
  dbiCompareBookmarks(DataSet.Handle, b1, b2, n);
  Result := n = 0;
{$ELSE}
  Result := DataSet.CompareBookmarks(b1, b2) = 0;
{$ENDIF}
end;

procedure RMDisableDBControls(aDataSet: TDataSet);
begin
  if aDataSet <> nil then
		aDataSet.DisableControls;
end;

procedure RMEnableDBControls(aDataSet: TDataSet);
begin
	if aDataSet <> nil then
		aDataSet.EnableControls;
end;

end.