sqlDataAdapter自动生成sqlUpdateCommand的SQL问题?
生成SQL如下:
this.sqlUpdateCommand1.CommandText = "UPDATE zd_czy SET dm = @dm, mc = @mc, mm = @mm WHERE (dm = @Original_dm) AND (mc " +"= @Original_mc OR @Original_mc IS NULL AND mc IS NULL) AND (mm = @Original_mm OR" +" @Original_mm IS NULL AND mm IS NULL);SELECT dm, mc, mm FROM zd_czy WHERE (dm =" + " @dm)";
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请问SELECT dm, mc, mm FROM zd_czy WHERE (dm =" +" @dm)";这句话到底有什么用呀。