Unable to Extract XML value from Oracle CBLOB - sql

Question

I am trying to select a specific xml value as column in a Oracle 11G table which is stored as XML - Huge CLOB, but unable to. Kindly help
Contents of XML as Below
<Bid xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/LCC.Crew.FAReserves.wsvc.Entities.FAReserves">
<AggressiveBidType></AggressiveBidType>
<BidCriteria>
<BidCriteria i:type="RapBidCriteria">
<Value xmlns:d4p1="http://www.w3.org/2001/XMLSchema" i:type="d4p1:string">BAC</Value>
</BidCriteria>
</BidCriteria>
<BidItem>RAP</BidItem>
<BidName>BAC</BidName>
<BidType>Standing</BidType>
<CatsId>10023</CatsId>
<EmployeeBidId>10620</EmployeeBidId>
<EmployeeId>135289</EmployeeId>
<EndDate>2015-03-29T00:00:00Z</EndDate>
<IsAggressive>false</IsAggressive>
<IsLodo>false</IsLodo>
<IsOnPremiseReserve>false</IsOnPremiseReserve>
<OperatingDate>2015-02-25T00:00:00Z</OperatingDate>
<Priority>0</Priority>
</Bid>
Below Statement return null
SELECT extract(XMLTYPE(XMLBIDCONTENT),'/Bid/BidName/text()') "REFERENCE"
FROM AOCREWBIDDING.EMPLOYEEBIDS
Where EmployeeBidID = 100
Below statement returns error
ORA-00932: inconsistent datatypes: expected - got -
00932. 00000 - "inconsistent datatypes: expected %s got %s"
*Cause:
*Action: Error at Line: 83 Column: 8
SELECT extract(XMLBIDCONTENT,'/Bid/BidName/text()').getStringVal() "REFERENCE"
FROM AOCREWBIDDING.EMPLOYEEBIDS
Where EmployeeBidID = 100

Answer 1

The extract() function is deprecated. It's better to use XMLQuery().
You need to either declare a default namespace to match the one in the XML document:
select XMLQuery('
declare default element namespace
"http://schemas.datacontract.org/2004/07/LCC.Crew.FAReserves.wsvc.Entities.FAReserves"; (: :)
/Bid/BidName/text()'
passing XMLType(xmlbidcontent)
returning content) as BidName
from employeebids
where EmployeeBidID = 100;
BIDNAME
--------------------------------------------------------------------------------
BAC
or (simpler but less robust) use a wildcard:
select XMLQuery('/*:Bid/*:BidName/text()'
passing XMLType(xmlbidcontent)
returning content) as BidName
from employeebids
where EmployeeBidID = 100;
BIDNAME
--------------------------------------------------------------------------------
BAC
db<>fiddle showing your original queries and both of these, using a CTE to provide the sample CLOB value.