Select xpath values as separate rows in Oracle SQL
I need to select some values from an XML stored in a CLOB column in an Oracle database. The best I could come up with is the following:
select extract(xmltype(COLUMN), 'xpath-expression').getStringVal() as XMLVAL from TABLE t;
The problem is that when the XPATH selects multiple nodes, the values are concatenated. I need to have each selected node on a separate row. Obviously the concatenation must occur in getStringVal(), I use that because I need to have strings in my client (not XMLType). What should I use instead of getStringVal()?
EDIT: note that there is a similar question here: Oracle Pl/SQL: Loop through XMLTYPE nodes - but I couldn't apply it to my case. It uses two different XPATH expressions, and the principle of separation is not clear.
EDIT2: The XML is very complex, but basically I need to find the "some value" entries in
<string name="SOME_KEY" value="some value"/>
elements that are burried under many other elements. I use the XPATH //*[@name="SOME_KEY"]/@value and it finds successfully the value attribute of all the XML elements that have a SOME_KEY attribute.
Try this.
SELECT EXTRACTVALUE (x.COLUMN_VALUE, 'xpath-expression')
FROM TABLE (
SELECT XMLSEQUENCE (
xmltype (column).EXTRACT ('xpath-expression'))
FROM t) x;
Sample at http://sqlfiddle.com/#!4/87af2/1
I had close to the same thing, but it didn't quite work with "Eat A Peach"'s answer. I had something like the following in a column as xmltype.
<?xml version="1.0" encoding="UTF-8"?>
<serviceRequestAnswer xmlns:fo="http://www.w3.org/1999/XSL/Format" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:fn="http://www.w3.org/2005/xpath-functions" xmlns:ns2="http://www.something.something/bla/v1">
<Persons>
<Person>
<InternalIdNumber>2935612467</InternalIdNumber>
<PublicIdNumber>9871256327</PublicIdNumber>
<FirstNames>Remy</FirstNames>
<LastName>Smith</LastName>
<BirthName>Smith</BirthName>
<BirthDate>19900101</BirthDate>
<PlaceOfBirth>0209</PlaceOfBirth>
<CountryOfBirth>6030</CountryOfBirth>
<Sex>M</Sex>
<Nationality>0001</Nationality>
</Person>
<Person>
<InternalIdNumber>7163584061</InternalIdNumber>
<PublicIdNumber>123432678</PublicIdNumber>
<FirstNames>Jesse</FirstNames>
<LastName>Smith</LastName>
<BirthName>Smith</BirthName>
<BirthDate>19900101</BirthDate>
<PlaceOfBirth>0012</PlaceOfBirth>
<CountryOfBirth>6030</CountryOfBirth>
<Sex>M</Sex>
<Nationality>0001</Nationality>
</Person>
</Persons>
</serviceRequestAnswer>
Let's call the column xmlcontent, and have this in a table named mytable. Then extracting the 2 public ID numbers as 2 rows can be done like so:
select
nvl(value (line).extract ('/Person/PublicIdNumber/text()').getstringval (),'') PublicId
from mytable, table ( xmlsequence (extract(xmlcontent,'serviceRequestAnswer/Persons/Person'))) line
where id_mytable = 10092053;
Hope this helps someone :)
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