Re: [basex-talk] Conceptual problems using BaseX from Python

Hi Kristian,

the client bindings are all fairly simple and generic. However, the BaseX server protocol provides the command "FULL", which will also give you the XQuery data type of each item [1]. You could enhance the Python client to retrieve the types as well.

Hope this helps Christian

[1] http://docs.basex.org/wiki/Server_Protocol

Am Do., 1. Nov. 2018 13:01 hat Kristian Kankainen kristian@keeleleek.ee geschrieben:

Hello,

XQuery is a lovely language and together with BaseX it is very lovely.

But now, for a project that need Python, I find difficulties understanding the general workflow communicating between BaseX and Python.

My basic situation boils down to 1) execute a query on BaseX that returns a list of data 2) analyse every item in the in Python 3) push the analysis result back in to BaseX.

I have done updates like this solely in XQuery but this time I need the analysis part done in Python.

Since I seem to only get a list of strings out of a query executed by the client, is this usecase even possible?

Below is attached my sample running code

Best regards, Kristian K

from BaseXClient import BaseXClient

# open a session
session = BaseXClient.Session('localhost', 1984, 'admin', 'admin')

# execute a query that returns a list of entry elements
query = session.query("""
let $list :=
  <list>
    <entry>
      <a>1</a>
      <b>2</b>
    </entry>
    <entry>
      <a>1</a>
      <b>2</b>
      <c>3</c>
    </entry>
  </list>

let $items :=
    for $entry in $list/entry[not(exists(./c))]
      return $entry

return $items
"""
)

# process each item of the query
for typecode, item in query.iter():
  print(type(item))
  print(item)

session.close()

This returns simply: <class 'str'> # the type of returned item is of class 'str' <entry> # this is the content of the plain text object <a>1</a> <b>2</b>

</entry>