Need to count number of non-empty (not null) occurrences for an element in XML
Hello,
I have some XML data stored in a CLOB, there is a fragment shown below:
<ADDR>
<AutoNameOfOrganisation>2nd Image</AutoNameOfOrganisation>
<AutoLine1>105 Risbygate Street</AutoLine1>
<AutoLine2> </AutoLine2>
<AutoLine3> </AutoLine3>
<AutoU40.16>BURY ST. EDMUNDS</AutoU40.16>
<AutoStateOrCounty>Suffolk</AutoStateOrCounty>
<AutoU40.13>IP33 3AA</AutoU40.13>
<AutoU40.14>UNITED KINGDOM</AutoU40.14>
</ADDR>
<ADDR>
<AutoNameOfOrganisation></AutoNameOfOrganisation>
<AutoLine1>2 2nd Avenue</AutoLine1>
<AutoLine2> </AutoLine2>
<AutoLine3> </AutoLine3>
<AutoU40.16>HULL</AutoU40.16>
<AutoStateOrCounty>East Riding of Yorkshire</AutoStateOrCounty>
<AutoU40.13>HU6 9NT</AutoU40.13>
<AutoU40.14>UNITED KINGDOM</AutoU40.14>
</ADDR>
What I would like to do is to be able to look at the whole of the xml and derive a count for a particular element where there is data .
In the above case <AutoNameOfOrganisation> is not null in the first record and null in the second whilst <AutoLine3> is null in both records, so I'd like the counts to be 1 for <AutoNameOfOrganisation> and 0 for <AutoLine3>.
The reason for this is so that I can avoid showing a column in a report if there is no data for that particular column in the results.
I'm using Oracle 11G.
Thanks for any help,
Chris
Here's one way :
select count(AutoNameOfOrganisation)
, count(AutoLine3)
from my_table t
, xmltable(
'/root/ADDR'
passing xmlparse(document my_clob)
columns AutoNameOfOrganisation varchar2(30) path 'normalize-space(AutoNameOfOrganisation)'
, AutoLine3 varchar2(30) path 'normalize-space(AutoLine3)'
) x ;
In your sample fragment there's no root element so I've added one to test the query (though it's also possible to work with real XML fragments).
You may also omit normalize-space() calls if empty nodes are really empty. In your sample, there's a whitespace so I've added the function to strip it off.
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<xsl:variable name="DavidsCount" select="count($Rows[(@David)='Yes'])"></xsl:variable>
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<xsl:variable name="SajsCount" select="count($Rows[(@Saj)='Yes'])"></xsl:variable>
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<xsl:if test="position() mod 2 = 1">
<xsl:attribute name="class">ms-alternating</xsl:attribute>
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<xsl:attribute name="style">
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<xsl:if test="normalize-space(@Title) = 'Miguel'">
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