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例:<br>sqlstr := 'insert aaa(a,b,c) valuesa,:b:,:c);<br>ClientDataSet.CommandText := sqlstr;<br>ClientDataSet.Params.ParamByName('a').Value := 1;<br>ClientDataSet.Params.ParamByName('b').Value := 'aa';<br>//c 我希望插入空值<br>生成:<br>insert aaa(a,b,c) values(1,'aa',null)<br>请问如何实现