Example: Simple XML Query

Here is an example of a simple XML query. This XML query executes the query stored in the xml_query column of the XML_QUERIES table. The SELECT statement may retrieve zero or more records with an XML query document to be executed:

INVOKE    XML.Query

WITH

SELECT    xml_query XmlDocument

FROM      XML_QUERIES

For example, suppose a record in the XML_QUERIES table contains this xml_query:

<Query>

    <Table Name="PERSON">

        <Column Name="FAMILY_NAME" Condition="Jo%"/>

    </Table>

</Query>

For this xml_query, the XML query method queries the corresponding PERSON records, and generates XML output that contains the query results. The records are in no specific order:

<Persons>

    <PERSON ID="377" FAMILY_NAME="Jones" FIRST_NAME="Bill"/>

    <PERSON ID="312" FAMILY_NAME="Johnson" FIRST_NAME="Ann"/>

</Persons>

This is equivalent to:

INVOKE    XML.Export

WITH

SELECT    *

FROM      person

WHERE     family_name LIKE 'Jo%'