cxGrid 主从表转存为excel为什么只保存了主表？？？救命！！！

如果你数据不多的话（1W以下）
可以用QUERY直接导

zglwxb(放狗咬人地)：可以保存主表和从表的数据到excel吗？请说详细一点，谢谢

bpmb2 () :
cxGRID怎样插入记录？在已分组的情况下又怎样？3Q

呵呵，我现在几万条，不会超过20秒。
用文件流处理很快的。
你用OLE方法肯定是很慢的。
做一个UNIT 然后使用代码如下：
unit UnitXLSFile;interfaceuses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Grids, Forms, Dialogs,db,dbctrls,comctrls;const
{BOF}
  CBOF      = $0009;
  BIT_BIFF5 = $0800;
  BOF_BIFF5 = CBOF or BIT_BIFF5;
{EOF}
  BIFF_EOF = $000a;
{Document types}
  DOCTYPE_XLS = $0010;
{Dimensions}
  DIMENSIONS = $0000;type
  TAtributCell = (acHidden,acLocked,acShaded,acBottomBorder,acTopBorder,
                acRightBorder,acLeftBorder,acLeft,acCenter,acRight,acFill);  TSetOfAtribut = set of TatributCell;  TXLSWriter = class(Tobject)
  private
    fstream:TFileStream;
    procedure WriteWord(w:word);
  protected
    procedure WriteBOF;
    procedure WriteEOF;
    procedure WriteDimension;
  public
    maxCols,maxRows:Word;
    procedure CellWord(vCol,vRow:word;aValue:word;vAtribut:TSetOfAtribut=[]);
    procedure CellDouble(vCol,vRow:word;aValue:double;vAtribut:TSetOfAtribut=[]);
    procedure CellStr(vCol,vRow:word;aValue:String;vAtribut:TSetOfAtribut=[]);
    procedure WriteField(vCol,vRow:word;Field:TField);
    constructor create(vFileName:string);
    destructor destroy;override;
  end;procedure SetCellAtribut(value:TSetOfAtribut;var FAtribut:array of byte);
procedure DataSetToXLS(ds:TDataSet;fname:String);
procedure StringGridToXLS(grid:TStringGrid;fname:String);implementationprocedure DataSetToXLS(ds:TDataSet;fname:String);
var c,r:Integer;
  xls:TXLSWriter;
begin
  xls:=TXLSWriter.create(fname);
  if ds.FieldCount > xls.maxcols then
    xls.maxcols:=ds.fieldcount+1;
  try
    xls.writeBOF;
    xls.WriteDimension;
    for c:=0 to ds.FieldCount-1 do
      xls.Cellstr(0,c,ds.Fields[c].DisplayLabel);
    r:=1;
    ds.first;
    while (not ds.eof) and (r <= xls.maxrows) do begin
      for c:=0 to ds.FieldCount-1 do
        if ds.Fields[c].AsString<>'' then
          xls.WriteField(r,c,ds.Fields[c]);
      inc(r);
      ds.next;
    end;
    xls.writeEOF;
  finally
    xls.free;
  end;
end;procedure StringGridToXLS(grid:TStringGrid;fname:String);
var c,r,rMax:Integer;
  xls:TXLSWriter;
begin
  xls:=TXLSWriter.create(fname);
  rMax:=grid.RowCount;
  if grid.ColCount > xls.maxcols then
    xls.maxcols:=grid.ColCount+1;
  if rMax > xls.maxrows then          // ¦¹®æ¦¡³Ì¦h¥u¯à¦s 65535 Rows
    rMax:=xls.maxrows;
  try
    xls.writeBOF;
    xls.WriteDimension;
    for c:=0 to grid.ColCount-1 do
      for r:=0 to rMax-1 do
        xls.Cellstr(r,c,grid.Cells[c,r]);
    xls.writeEOF;
  finally
    xls.free;
  end;
end;{ TXLSWriter }constructor TXLSWriter.create(vFileName:string);
begin
  inherited create;
  if FileExists(vFilename) then
    fStream:=TFileStream.Create(vFilename,fmOpenWrite)
  else
    fStream:=TFileStream.Create(vFilename,fmCreate);  maxCols:=100;   // <2002-11-17> dllee Column À³¸Ó¬O¤£¥i¯à¤j©ó 65535, ©Ò¥H¤£¦A³B²z
  maxRows:=65535; // <2002-11-17> dllee ³oÓ®æ¦¡³Ì¤j¥u¯à³o»ò¤j¡A½Ðª`·N¤jªº¸ê®Æ®w«Ü®e©ö´N¤j©ó³oÓÈ
end;destructor TXLSWriter.destroy;
begin
  if fStream <> nil then
    fStream.free;
  inherited;
end;procedure TXLSWriter.WriteBOF;
begin
  Writeword(BOF_BIFF5);
  Writeword(6);           // count of bytes
  Writeword(0);
  Writeword(DOCTYPE_XLS);
  Writeword(0);
end;procedure TXLSWriter.WriteDimension;
begin
  Writeword(DIMENSIONS);  // dimension OP Code
  Writeword(8);           // count of bytes
  Writeword(0);           // min cols
  Writeword(maxRows);     // max rows
  Writeword(0);           // min rowss
  Writeword(maxcols);     // max cols
end;procedure TXLSWriter.CellDouble(vCol, vRow: word; aValue: double;
  vAtribut: TSetOfAtribut);
var  FAtribut:array [0..2] of byte;
begin
  Writeword(3);           // opcode for double
  Writeword(15);          // count of byte
  Writeword(vCol);
  Writeword(vRow);
  SetCellAtribut(vAtribut,fAtribut);
  fStream.Write(fAtribut,3);
  fStream.Write(aValue,8);
end;procedure TXLSWriter.CellWord(vCol,vRow:word;aValue:word;vAtribut:TSetOfAtribut=[]);
var  FAtribut:array [0..2] of byte;
begin
  Writeword(2);           // opcode for word
  Writeword(9);           // count of byte
  Writeword(vCol);
  Writeword(vRow);
  SetCellAtribut(vAtribut,fAtribut);
  fStream.Write(fAtribut,3);
  Writeword(aValue);
end;procedure TXLSWriter.CellStr(vCol, vRow: word; aValue: String;
  vAtribut: TSetOfAtribut);
var  FAtribut:array [0..2] of byte;
  slen:byte;
begin
  Writeword(4);           // opcode for string
  slen:=length(avalue);
  Writeword(slen+8);      // count of byte
  Writeword(vCol);
  Writeword(vRow);
  SetCellAtribut(vAtribut,fAtribut);
  fStream.Write(fAtribut,3);
  fStream.Write(slen,1);
  fStream.Write(aValue[1],slen);
end;procedure SetCellAtribut(value:TSetOfAtribut;var FAtribut:array of byte);
var
   i:integer;
begin
//reset
  for i:=0 to High(FAtribut) do
    FAtribut[i]:=0;
     if  acHidden in value then       //byte 0 bit 7:
         FAtribut[0] := FAtribut[0] + 128;     if  acLocked in value then       //byte 0 bit 6:
         FAtribut[0] := FAtribut[0] + 64 ;     if  acShaded in value then       //byte 2 bit 7:
         FAtribut[2] := FAtribut[2] + 128;     if  acBottomBorder in value then //byte 2 bit 6
         FAtribut[2] := FAtribut[2] + 64 ;     if  acTopBorder in value then    //byte 2 bit 5
         FAtribut[2] := FAtribut[2] + 32;     if  acRightBorder in value then  //byte 2 bit 4
         FAtribut[2] := FAtribut[2] + 16;     if  acLeftBorder in value then   //byte 2 bit 3
         FAtribut[2] := FAtribut[2] + 8;     // <2002-11-17> dllee ³Ì«á 3 bit À³¥u¦³ 1 ºØ¿ï¾Ü
     if  acLeft in value then         //byte 2 bit 1
         FAtribut[2] := FAtribut[2] + 1
     else if  acCenter in value then  //byte 2 bit 1
         FAtribut[2] := FAtribut[2] + 2
     else if acRight in value then    //byte 2, bit 0 dan bit 1
         FAtribut[2] := FAtribut[2] + 3
     else if acFill in value then     //byte 2, bit 0
         FAtribut[2] := FAtribut[2] + 4;
end;procedure TXLSWriter.WriteWord(w: word);
begin
  fstream.Write(w,2);
end;procedure TXLSWriter.WriteEOF;
begin
  Writeword(BIFF_EOF);
  Writeword(0);
end;procedure TXLSWriter.WriteField(vCol, vRow: word; Field: TField);
begin
  case field.DataType of
     ftString,ftWideString,ftBoolean,ftDate,ftDateTime,ftTime:
       Cellstr(vcol,vrow,field.asstring);
     ftAutoInc,ftSmallint,ftInteger,ftWord:
       CellWord(vcol,vRow,field.AsInteger);
     ftFloat, ftBCD:
       CellDouble(vcol,vrow,field.AsFloat);
  else
       Cellstr(vcol,vrow,EmptyStr);   // <2002-11-17> dllee ¨ä¥L«¬ºA¼g¤JªÅ¥Õ¦r¦ê
  end;
end;
end.

个将dbgrid导为excel文件的过程，需要引用单元comoby，一个ExcelApplication1控件：
procedure CopyDbDataToExcel(Target: TDbgrid);
var
iCount, jCount: Integer;
XLApp: Variant;
Sheet: Variant;
begin
Screen.Cursor := crHourGlass;
if not VarIsEmpty(XLApp) then
begin
XLApp.DisplayAlerts := False;
XLApp.Quit;
VarClear(XLApp);
end;
//通过ole创建Excel对象
try
XLApp := CreateOleObject('Excel.Application');
except
Screen.Cursor := crDefault;
Exit;
end;
XLApp.WorkBooks.Add[XLWBatWorksheet];
XLApp.WorkBooks[1].WorkSheets[1].Name := '测试工作薄';
Sheet := XLApp.Workbooks[1].WorkSheets['测试工作薄'];
if not Target.DataSource.DataSet.Active then
begin
Screen.Cursor := crDefault;
Exit;
end;
Target.DataSource.DataSet.first; for iCount := 0 to Target.Columns.Count - 1 do
begin
Sheet.cells[1, iCount + 1] := Target.Columns.Items[iCount].Title.Caption;
end;
jCount := 1;
while not Target.DataSource.DataSet.Eof do
begin
for iCount := 0 to Target.Columns.Count - 1 do
begin
Sheet.cells[jCount + 1, iCount + 1] := Target.Columns.Items[iCount].Field.AsString;
end;
Inc(jCount);
Target.DataSource.DataSet.Next;
end;
XlApp.Visible := True;
Screen.Cursor := crDefault;
end; //调用
procedure TForm2.SpeedButton5Click(Sender: TObject);
begin
copyDbDataToExcel(dbgrid1);
end;

调试易

cxGrid 主从表转存为excel为什么只保存了主表？？？救命！！！

解决方案 »