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 ='
<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>'
--Create an internal representation of the XML document.
EXEC sp_xml_preparedocument @idoc OUTPUT, @doc

-- Execute a SELECT statement that uses the OPENXML rowset provider.
SELECT *
FROM OPENXML (@idoc, '/ROOT/Customer',1)
WITH (CustomerID  varchar(10),
      ContactName varchar(20))

With a result:

CustomerID ContactName          
---------- -------------------- 
VINET      Paul Henriot
LILAS      Carlos Gonzlez

Does someone know of an alternative for Postgres?

Peter Eisentraut · Accepted Answer · 2009-09-02 00:49:46Z

1

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

answered Sep 2, 2009 at 0:49

Peter Eisentraut

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Comments

Billy · Accepted Answer · 2015-11-30 13:52:15Z

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

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