Using XPath with SQL to extract XML data
Given data such as this one:
<?xml version="1.0"?>
<ExtendedData>
<Parameter name="CALLHOLD"><BooleanValue>true</BooleanValue></Parameter>
<Parameter xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="BARRING_PASSWORD" xsi:nil="true"/>
<Parameter name="ALLCF"><BooleanValue>true</BooleanValue></Parameter>
<Parameter name="RealProv"><BooleanValue>false</BooleanValue></Parameter>
</ExtendedData>I normally use extractValue function as shown below for example to extract the value for the last parameter in the data above, e.g:
select extractValue(extended_data,'/ExtendedData/Parameter[@name="RealProv"]/BooleanValue') "my_column_alias" from tableAny ideas on how I may return the value of the parameter xsi:nil from this node:
<Parameter xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="BARRING_PASSWORD" xsi:nil="true"/>I'd like to extract the true in xsi:nil="true"...
Thanks,
Edited by: HouseofHunger on May 15, 2012 2:13 PM
Edited by: HouseofHunger on May 15, 2012 2:13 PM
Extractvalue() has a third parameter we can use to declare namespace mappings :
SQL> with sample_data as (
2 select xmltype('<?xml version="1.0"?>
3 <ExtendedData>
4 <Parameter name="CALLHOLD"><BooleanValue>true</BooleanValue></Parameter>
5 <Parameter xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="BARRING_PASSWORD" xsi:nil="true"/>
6 <Parameter name="ALLCF"><BooleanValue>true</BooleanValue></Parameter>
7 <Parameter name="RealProv"><BooleanValue>false</BooleanValue></Parameter>
8 </ExtendedData>') doc
9 from dual
10 )
11 select extractvalue(
12 doc
13 , '/ExtendedData/Parameter[@name="BARRING_PASSWORD"]/@xsi:nil'
14 , 'xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"'
15 )
16 from sample_data
17 ;
EXTRACTVALUE(DOC,'/EXTENDEDDAT
true
If you're on 11.2.0.2 and up, extractvalue() is deprecated.
One should use XMLCast/XMLQuery instead :
SQL> with sample_data as (
2 select xmltype('<?xml version="1.0"?>
3 <ExtendedData>
4 <Parameter name="CALLHOLD"><BooleanValue>true</BooleanValue></Parameter>
5 <Parameter xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="BARRING_PASSWORD" xsi:nil="true"/>
6 <Parameter name="ALLCF"><BooleanValue>true</BooleanValue></Parameter>
7 <Parameter name="RealProv"><BooleanValue>false</BooleanValue></Parameter>
8 </ExtendedData>') doc
9 from dual
10 )
11 select xmlcast(
12 xmlquery('/ExtendedData/Parameter[@name="BARRING_PASSWORD"]/@xsi:nil'
13 passing doc
14 returning content
15 ) as varchar2(5)
16 )
17 from sample_data
18 ;
XMLCAST(XMLQUERY('/EXTENDEDDAT
true
Note : the xsi prefix is predefined when using Oracle XQuery, so in this case we don't have to declare it explicitly.
Edited by: odie_63 on 15 mai 2012 15:23
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Problem with extracting Xml data source fields
Post Author: new_crystal
CA Forum: Crystal Reports
Hi,
I am creating a report which has a xml data source.
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BR,
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I read your posted question - I have the same problem.
I think that the method find_from_path_ns (or find_from_path) is the only "xpath"-like way to get a value.
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Message was edited by:
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http://www.oracle.com/technology/sample_code/tech/java/sqlj_jdbc/files/oracle10g/webrowset/GetWebRowSet.java.html
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To automate this whole process you can further add all the report programs into a process chain (RSPC) which can be schedule as per requirement .
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Check thi link for sample code :
[http://www.tricktresor.de/content/index.php?navID=696&aID=496]
Hope this will be helpful .
Regards,
Jaya Tiwari
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