Dynamic XQuery Where clause

I have the following schema:
<?xml version="1.0"?>
<xs:schema
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:tns="CountryRiskService"
targetNamespace="CountryRiskService"
elementFormDefault="qualified"
attributeFormDefault="unqualified">
<xs:element name="CountryRiskParameters">
<xs:complexType>
<xs:sequence>
<xs:element name="countryId" type="xs:int" minOccurs="1" maxOccurs="unbounded"/>
<xs:element name="catA" type="xs:boolean" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
I am passing this into my Logical Data Service, what I want to do is create a dynamic XQuery where clause if the catA field is populated, ignore it if it isn’t, so basically, I want to be able to create a dynamic query based on the parameters requested, so I have the following XQUERY:
declare function tns:getCountries($countryRiskInput as element(ns7:CountryRiskParameters)) as element(ns0:CountryRiskInfo)* {
for $tbl_high_risk_countries in ns1:tbl_high_risk_countries()
where $countryRiskInput/ns4:countryId = $tbl_high_risk_countries/country_id
where $countryRiskInput/ns4:catA = $tbl_high_risk_countries/risk_catA
I really thought that DSP would be able to handle this on the fly since the element is optional but if I don’t populate it, I get nothing back, the idea is I want to increase the number of elements in my schema so my consumers have the ability to filter the results they want, so above, I don’t want the second where clause if catA isn't specified, any ideas how to accomplish this?

Simply add the disjunction of the input being empty.
for $tbl_high_risk_countries in ns1:tbl_high_risk_countries()
where $countryRiskInput/ns4:countryId = $tbl_high_risk_countries/country_id
where ( $countryRiskInput/ns4:catA = $tbl_high_risk_countries/risk_catA or empty( $countryRiskInput/ns4:catA )
But suppose you have 27 different elements that you might want to filter on - the xquery gets long and ugly. You might want to looking into using FilterXQuery. Visit http://edocs.bea.com/aldsp/docs25/, search on FilterXQuery, look for the tutorial.
If your queries get more complicated, you would do well to look into generating ad hoc queries. (edocs as well).

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  • About dynamic  where clause

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    3- how to add bindig variable programaticly without adding it phisicaly in the EmployeesVo SQL

    Duplicate to about dynamic  where clause
    User, please don't post the same question multiple times in this forum.
    Timo

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              <key>salary</key>
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    >
    our application has java front end , the users have option to select multiple filter values . the frond end developers will send an xml construct as the one i have showed . based on the input xml i have to apply those filters on a table . so i thought using xml dom and parse the xml and make a dynamic sql from that .
    >
    why java app needs to send XML? Let it create SQL and execute it.
    Of course you can do it in PL/SQL but it less convenient comparing to Java.
    If you can extract values from XML, then just create SQL for them, assign bind vars and execute it dynamically.
    Yes, you will have to implement lots of IF logic.
    Advise: Use bind variables as placeholders for values to avoid injection attacks. Do not concatenate values into your dynamic SQL.

  • Expert mode query in View objects and appended where clause

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