从R中无法识别的postgres提取XML内容

Question

I use a substring query in PostGresql to generate the following output.

I used this in the dbGetQuery in R studio:

dbGetQuery(con, "SELECT substring(response from 11 for       position('</ConsumerEnquiry>'     in response) + 8)  FROM za.scoring_result where id in (334)")

The Output is:

<?xml version="1.0"?>
<ConsumerEnquiry>
 <Session>
  <User_ID>ROCK1</User_ID>
  <FullName>ROCK1</FullName>
  <GroupName>014828</GroupName>
  <Subscriber_ID>14828</Subscriber_ID>
  <Group_ID>014828</Group_ID>
  <RequestType>XML2</RequestType>
  <Environment>PRODUCTION</Environment>
  <Version>1.0.0</Version>
 </Session>
</ConsumerEnquiry>

When I try:

file2 = xmlParse("SA_Data_1")

I get an error:

Error: XML content does not seem to be XML: 'SA_Data_1'

Can someone help me? My first post here.. :)

Answer 1

You need to save the output. I'm guessing you really mean to do:

SA_Data_1 = dbGetQuery(con,
   "SELECT substring(response from 11 for  position('</ConsumerEnquiry>' in response) + 8)  
    FROM za.scoring_result where id in (334)")

assuming this returns the XML as a character string, then you can do

SA_parsed = xmlParse(SA_Data_1$substring)

to get a parsed version of the XML. Then you can extract bits from it using the rest of the XML package.

file2 = xmlParse("SA_Data_1")

fails because its interpreting "SA_Data_1" as a piece of XML, which it isn't.