这样动态建数据集，为什么不能open?(50分)

var<br>&nbsp; &nbsp;tempDataSet:TDataSet;<br>begin<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; tempDataSet:=TDataSet.Create(nil);<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; tempDataSet.FieldDefs.Add('bz',ftString,100,false);<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; tempDataSet.FieldDefs.Add('dt',ftString,100,false);<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; tempDataSet.Open;<br>一运行到open时就报错？难道只能用clientDataset吗？

当然,dataset 是必须有 database connection 的,否则必错,用内存表 clientdataset 或者<br>&nbsp;kbmmemtable都可以解决

接受答案了.