Delphi中存储记录数据到BLOB Field

定义:

TUser = packed record
   Name : string[50];
   CanAsk : boolean;
   NumberOfQuestions : integer;
end; 

存储:

var
   User : TUser;
   blobF : TBlobField;
   bs : TStream;
begin
   User.Name := edName.Text;
   User.NumberOfQuestions := StrToInt(edNOQ.Text) ;
   User.CanAsk := chkCanAsk.Checked;

   myTable.Insert;

   blobF := myTable.FieldByName('data') as TBlobField;
   bs := myTable.CreateBlobStream(blobF, bmWrite) ;
   try
     bs.Write(User,SizeOf(User)) ;
   finally
     bs.Free;
   end;
end; 

读取:

var
   User : TUser;
   blobF : TBlobField;
   bs : TStream;
begin
   if myTable.FieldByName('data').IsBlob then
   begin
     blobF := DataSet.FieldByName('data') as TBlobField;
     bs := myTable.CreateBlobStream(blobF, bmRead) ;
     try
       bs.Read(user,sizeof(TUser)) ;
     finally
       bs.Free;
     end;
   end;

   edName.Text := User.Name;
   edNOQ.Text := IntToStr(User.NumberOfQuestions) ;
   chkCanAsk.Checked := User.CanAsk;
end;