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Don Burleson Blog 







dbms_xmlgen.getxml Output Spans Multiple Lines

Expert Oracle Database Tips by Donald BurlesonMarch 8, 2015


Question:  I have this Oracle XML and I get an external XML parsing error because the tag spans multiple lines:

set pages 0
set lines 150
set long 9999999
set head off select dbms_xmlgen.getxml
('select * from (select no,subject where mykey=1)') xml from dual ;

<?xml version="1.0"?>
<SUBJECT>123456789 123456789 123456789 123456789 123456789 123456789 12</SUBJ

As you see, the <SUBJECT> XML tag is spanning in two lines, and so the output is invalid for external xml parser.

What is the line continuation character for Oracle XML when using dbms_xmlgen?

Answer:  There is no "continuation" character in native XML!!!  

Normally, if you write an XML on several lines, leave whitespace, like this:

123456789 123456789 123456789 123456789 123456789 123456789 12

However, you have dbms_xmlgen output executed from SQL*Plus, and the line break is created by SQL*Plus, not dbms_xmlgen.  

Rarely, there are cases of the error:  

ORA-01706:  User function result value was too large  

But in your case, the SQL*Plus output is truncated to 77 characters.  

Start by spooling the SQL*Plus output to a flat file and see if it spans there:

sqlplus -S system/manager << !
set pages  999
set lines  999
set long  9999
set head off spool /tmp/myfile.txt
select dbms_xmlgen.getxml ('select * from (select no, subject where mykey=1)') xml from dual ;
spool off
cat /tmp myfile.txt

It is also possible that your SQL*Plus output line length is not long enough.  Try going to 110 line using the following command:

set lines 110

If 110 is not long enough, you can try larger numbers.

If it is still truncating at 77 characters at this point, try the following with 100 character SQL output:

spool /tmp/myfile.txt
select '123456789 123456789 123456789 123456789 123456789 123456789 123456789 1234567890 123456789 123456789'
from dual;
spool off

If this works for you with the XML package, it would appear that you have hit a bug with dbms_xmlgen.getxml.

You can check MOSC for more information.

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