Postgres中的OPENXML
SQLServer有一个非常有用的函数,名为。它的工作原理如下:Postgres中的OPENXML,xml,postgresql,Xml,Postgresql,SQLServer有一个非常有用的函数,名为。它的工作原理如下: 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"> <
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))
结果是:
CustomerID ContactName
---------- --------------------
VINET Paul Henriot
LILAS Carlos Gonzlez
有人知道Postgres的替代方案吗?这在PostgreSQL中目前是不可能的,除非有人编写了很棒的代码,但他直到现在都没有告诉任何人。我相信这段代码可以改进,但这在Postgres中返回的结果与您在SQL Server中发布的代码相同
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