asp.net 水晶报表--主从表关联问题

   sqldataadapter cmd1 = new sqldataadapter(strs,cnn);

   //create and fill the dataset.

   dataset2 ds = new dataset2();
   cmd1.fill(ds,"meeting");

   // sqldataadapter cmd2 = new sqldataadapter("select * from realplan where rplanid in (select top 10000 planid from ("+sqlstr+")as  a order by planid)", cnn);
   sqldataadapter cmd2 = new sqldataadapter(sqlisoper, cnn);
   
   cmd2.fill(ds,"realplan");

   //create the relation between the authors and titles tables.
   ds.relations.add("mo",
    ds.tables["meeting"].columns["planid"],
    ds.tables["realplan"].columns["rplanid"]);

   //binding reportviewer
   ocr.setdatasource(ds);

   this.crystalreportviewer1.reportsource = ocr;

   //close the connection.
   cnn.close();
   
  }