Question

I have a query that I am generating the XML from in Oracle using the DBMS_XMLGEN package.

As an example, I am using a cursor as follows:

SELECT    A.NAME primaryName,    (CURSOR(SELECT B.NAME AS NAME FROM B WHERE B.ID=A.ID)) SYNONYMS FROM   A  

I have a query context, qtx, and set the query to the above for that context. Calling:

result := DBMS_XMLGEN.getXML(qryCtx); 

gets me almost where I want to be, from the viewpoint of the generated XML:

<PRIMARYNAME>Main Name</PRIMARYNAME>   <SYNONYMS>    <SYNONYMS_ROW>     <NAME>Synonym1</NAME>    </SYNONYMS_ROW>    <SYNONYMS_ROW>     <NAME>Synonym2</NAME>    </SYNONYMS_ROW>   </SYNONYMS> 

What I would really like to do is suppress the SYNONYMS_ROW tag. I’ve also tried a (CAST(MULTISET( <query>) and have similar results.

I know I could do a CLOB search and replace, but it seem like there should be a slightly easier or better engineered approach (ie, should I define the desired xsd and use that somehow?). I could also do a full stored procedure and build the tags as needed on the fly using cursors, but it would be nice to have a single SQL statement to use instead. Thanks for any suggestions

Thanks Nick – it turned out that the easiest way to solve the issue I describe was to use the XMLAGG function and generate my XML result slightly differently.

select    XMLELEMENT('primaryName',A.Name),    xmlelement('synonyms',        (SELECT XMLAGG(XMLELEMENT('name',b.name) ) from b         where b.id=a.id and b.type='S') ) from    A 

Answer 1

You’ll need to drop down to PL/SQL where you have more control over the dbms_xmlgen package. For instance, here is how you can change the behavior of the row tags it sets.

declare qryctx DBMS_XMLGEN.ctxhandle; results xmltype; begin    qryctx := dbms_xmlgen.newcontext('select foo from bar where id = my_id');   dbms_xmlgen.SETBINDVALUE(qryctx,'my_id',id);     dbms_xmlgen.setRowTag(qryCtx,NULL);     dbms_xmlgen.setRowSetTag(qryCtx,NULL);   results := dbms_xmlgen.getxmltype(qryctx);   dbms_xmlgen.closecontext(qryctx);   return results; end; 

This package will allow you not only to change the row tag, but also the tag that goes around all the rows. In the above example, I suppressed the row tag by passing NULL as the second arguement into the dbms_xmlgen.setRowTag call. I hope this helps.