OPENXML in Postgres

Question

SQLServer has a very useful function called OPENXML. It works is used like this:

DECLARE @idoc int
DECLARE @doc varchar(1000)
SET @doc =\'



        

Answer 1

I'm sure this code can be improved, but this appears to return the same result in Postgres as the code you posted does in SQL Server.

WITH test_xml(data) AS (VALUES
  ('<ROOT>
    <Customer CustomerID="VINET" ContactName="Paul Henriot">
       <Order CustomerID="VINET" EmployeeID="5" OrderDate="1996-07-04T00:00:00">
          <OrderDetail OrderID="10248" ProductID="11" Quantity="12"/>
          <OrderDetail OrderID="10248" ProductID="42" Quantity="10"/>
       </Order>
    </Customer>
    <Customer CustomerID="LILAS" ContactName="Carlos Gonzlez">
       <Order CustomerID="LILAS" EmployeeID="3" OrderDate="1996-08-16T00:00:00">
          <OrderDetail OrderID="10283" ProductID="72" Quantity="3"/>
       </Order>
    </Customer>
    </ROOT>'::XML)
)
SELECT  unnest((xpath('//Customer/@CustomerID', test_xml.data))),
        unnest((xpath('//Customer/@ContactName', test_xml.data)))
FROM test_xml

Answer 2

This is currently not possible in PostgreSQL (unless someone has written awesome code that he didn't tell anyone about until now).