求教oracle+php的问题

Question

如用oci函数:
<?php
   $query="SELECT  l_danwei_name,c_danwei_name,e_danwei_name";
   $query.=" FROM feng.luru_danwei_info";   $connection=ocilogon("feng","feng","bnyy");
   $cursor= ocinewcursor($connection);
    ociparse($cursor,$query);      ociexecute($cursor);     while(ocifetch($cursor))
      {
  $numcolms=ocinumcols($cursor);
  for ($numcolm=0;$numcolm<$numcolms;$numcolm++)
    {
 $data=trim(ocigetcolumn($cursor,$numcolm));
 echo "$data\t";
     }
       }       ocifreecursor($cursor);
       ocilogoff($connection);?>
错误如下:
Warning: ociparse(): supplied resource is not a valid OCI8-Connection resource in /usr/local/apache/htdocs/select.php on line 7Warning: ocifetch(): OCIFetch: ORA-24338: 未执行语句句柄 in /usr/local/apache/htdocs/select.php on line 11