selecting a specific string from blob column - oracle

Question

I have a table named as MSTCUSTOMERPROFILE haves a column ROLELIST which is of BLOB type. Now this BLOB haves data in xml format eg data...
<RoleListDTO>
<rolelist>
<RoleDTO>
<idEntity/>
<idEntityDesc/>
<userType>ECU</userType>
<userTypeDesc/>
<idRole>5</idRole>
<description>02A ENQUIRIES - ACCOUNT INFORMATION</description>
<idChannel>01</idChannel>
<idChannelDesc/>
<token/>
<datCreated/>
<createdBy/>
<datLastUpdated/>
<isDefaultRole>false</isDefaultRole>
<isDisplayCustProfile>false</isDisplayCustProfile>
<idcust/>
<typecust/>
<roleCreatebyUser>
<ListUserDTO>
<idEntity/>
<idEntityDesc/>
<userType/>
<userTypeDesc/>
<idChannel/>
<idChannelGroup/>
<idChannelDesc/>
<firstName/>
<lastName/>
<idChannelUser/>
<salutation/>
<idUser/>
<email/>
<isActive/>
<isProxyLocked/>
<isGroupFlag/>
<lockReason/>
<actDeactReason/>
</ListUserDTO>
</roleCreatebyUser>
</RoleDTO>
<RoleDTO>
<idEntity/>
<idEntityDesc/>
<userType>ECU</userType>
<userTypeDesc/>
<idRole>88</idRole>
<description>02C ENQUIRIES - CREDIT CARD DETAILS</description>
<idChannel>01</idChannel>
<idChannelDesc/>
<token/>
<datCreated/>
<createdBy/>
<datLastUpdated/>
<isDefaultRole>false</isDefaultRole>
<isDisplayCustProfile>false</isDisplayCustProfile>
<idcust/>
<typecust/>
<roleCreatebyUser>
<ListUserDTO>
<idEntity/>
<idEntityDesc/>
<userType/>
<userTypeDesc/>
<idChannel/>
<idChannelGroup/>
<idChannelDesc/>
<firstName/>
<lastName/>
<idChannelUser/>
<salutation/>
<idUser/>
<email/>
<isActive/>
<isProxyLocked/>
<isGroupFlag/>
<lockReason/>
<actDeactReason/>
</ListUserDTO>
</roleCreatebyUser>
</RoleDTO>
</rolelist>
<rmemail/>
</RoleListDTO>
I want to fetch the data inside <idRole> tag in the blob, in this case it being 88 i.e the result I want to fetch.
I need to do this by select query, is it possible in Oracle Database.? How ??

Answer 1

Take a look at the XML functions doc: https://docs.oracle.com/cd/E11882_01/server.112/e41084/functions002.htm#SQLRF51184
Something like EXTRACTVALUE

Answer 2

I have had a work around basically I wanted to do some logic based on a value in node in xml which happens to be inside this blob and wanted it in java. so I read the blob in java, into an byte array, made a DTO, a java class exactly with the same details and properties as the xml and nodes in it and populated it by using DTO unmarshalling logic, passed byte array and all.
So basically I did a workaround and its exactly not the answer I was looking for but it works.