r = stm.executeQuery("select 宿舍楼号,宿舍号,姓名,性别 ,空缺人数 from 宿舍查询 where 姓名= '"+txt.getText()+"'");
}
else
if((!(txt.getText().equals("")))&& box.getSelectedItem().equals("性别")){
r = stm.executeQuery("select 宿舍楼号,宿舍号,姓名,空缺人数 from 宿舍查询 where 性别= '"+txt.getText()+"'");
}
else
if((!(txt.getText().equals("")))&& box.getSelectedItem().equals("空缺人数"))
{
r = stm.executeQuery("select 宿舍楼号,宿舍号,空缺人数 from 宿舍查询 where 空缺人数= '"+txt.getText()+"'");
}
int columnCount =r.getMetaData().getColumnCount();