The XML Adapter can be configured to create a relational model of the data in the XML file or source, treating each XPath as an individual table containing a primary key and a foreign key that links to the parent document. This is particularly useful if you need to work with your XML data in existing BI, reporting, and ETL tools that expect a relational data model.

Joining Nested Arrays as Tables

With DataModel set to "Relational", any JOINs are controlled by the query. Any time you perform a JOIN query, the XML file or source will be queried once for each table included in the query.

Example

Below is a sample query against the sample document in Raw Data, using a relational model based on the XML paths "/root/people", "/root/people/vehicles", and "/root/people/vehicles/maintenance".

Connecting String

Set the DataModel connection property to "Relational" and set the XPath connection property to "/root/people;/root/people/vehicles;/root/people/vehicles/maintenance;" to perform the following query and see the example result set.

URI=C:\people.txt;DataModel=Relational;XPath='/root/people;/root/people/vehicles;/root/people/vehicles/maintenance;'

Query

The following query explicitly JOINs the people, vehicles, and maintenance tables.

SELECT 
  "people"."personal.age" AS age, 
  "people"."personal.gender" AS gender, 
  "people"."personal.name.first" AS first_name, 
  "people"."personal.name.last" AS last_name, 
  "people"."source", 
  "vehicles"."type", 
  "vehicles"."model", 
  "vehicles"."insurance.company" AS ins_company, 
  "vehicles"."insurance.policy_num" AS ins_policy_num, 
  "maintenance"."date" AS maint_date, 
  "maintenance"."desc" AS maint_desc
FROM 
  "people"
JOIN 
  "vehicles" 
ON 
  "people"."_id" = "vehicles"."people_id"
JOIN 
  "maintenance" 
ON 
  "vehicles"."_id" = "maintenance"."vehicles_id"

Results

In the example query, each maintenance element is JOINed to its parent vehicle element, which is JOINed to its parent people element to produce a table with 8 rows (2 maintenance entries for each of 2 vehicles each for 2 people).

See Also

• Automatic Schema Discovery: Configure the columns reported in the table schemas.
• Free-Form Queries: Use dot notation to select nested data.
• Vertical Flattening: Query nested data as separate tables.
• XML Functions: Manipulate the data returned to perform client-side aggregation and transformations.