problems with PHP and ADODB library and SQL server - php

Question

I have a PHP function using ADODB library. My query is simple, select distinct SessID from 'table'.
When I iterate, I keep getting the following error:
Notice: Undefined index: SessID in C:\Program Files\xampp\htdocs\conference\AbstractSearchDAO.php on line 116
Here is the code:
public function searchAbstracts($name,$title){
/**,$dayArray,$sessionTypeArray, $abstractTypeArray,$groupBy*/
$sql_abstract_session_ids = "select distinct SessID from ABSTRACT where ";
if($name!=null && $title!=null){
$sql_abstract_session_ids .= "FALastName like "."'%".$name."%' or AbstractTitle like "."'%".$title."%'";
}elseif($name!=null && $title==null){
$sql_abstract_session_ids .= "FALastName like "."'%".$name."%'";
}elseif($name==null && $title!=null){
$sql_abstract_session_ids .= "AbstractTitle like "."'%".$title."%'";
}elseif($name==null && $title==null){
$sql_abstract_session_ids = "select distinct SessID from ABSTRACT";
}
$connect = new ATSDataSourceLocator();
$conn = $connect->connectConference2011();
echo $sql_abstract_session_ids;
//////////////////////////////////////////////////////////
//let's get the session ids from the abstract table.
//we can then match them with another search on the session table (where SessID in (...abstract_session_ids....)
$ADODB_FETCH_MODE = ADODB_FETCH_ASSOC;
$rs = $conn->Execute($sql_abstract_session_ids);
if($rs==false) die('failed');
$sql_session_data = "select * from SESSION where SessID in (";
$count = $rs->RecordCount();
$myCount = 0;
while(!$rs->EOF){
$sql_session_data.="'".$rs->fields['SessID']."'";
if($myCount<($count-1)){
$sql_session_data.=",";
}
$myCount++;
$rs->MoveNext();
}
$sql_session_data.=")";
//$conn->Close();
echo $sql_session_data;
}
Whenever I try to Iterate and get the field 'SessID' It fails.
Any ideas?

Answer 1

Check out how ADODB_ASSOC_CASE is defined and compare that value to the ADODB manual. If you're not setting it explicitly, it should be defaulted to 2, which means your capitalization in your script has to match exactly the capitalization in the table. Also, note that this must be define'd before you include adodb.inc.php. And lastly, double- and triple-check that the field is definitely SessID in your ABSTRACT table.

Answer 2

Have you tried $rs->fields('SessID') in your iteration - i.e. replace the square brackets with round? Or, for example, keep the square brackets and use $rs->fields[0] (if it's the first field)?
With MySQL this isn't an issue, but it will throw an error if you use round instead of square with a field index, as opposed to name. I don't have a SQL Server DB handy to test against.
Something in the back of my mind says this behaviour may also vary depending upon your ADODB_FETCH setting. This, at least, does indeed appear to be driver-specific:
"If no fetch mode is predefined, the fetch mode defaults to ADODB_FETCH_DEFAULT. The behaviour of this default mode varies from driver to driver, so do not rely on ADODB_FETCH_DEFAULT. For portability, we recommend sticking to ADODB_FETCH_NUM or ADODB_FETCH_ASSOC. Many drivers do not support ADODB_FETCH_BOTH."