def is_lucene_query_clean(db, query):
"""
Use a cost-effective way to determine whether a Lucene query has a
syntax error.
:param: The Lucene query to check.
:returns: ``True`` if the query has no syntax error, ``False`` if
it does have syntax errors.
"""
try:
# This appears to be as cost-effective as it gets. We run a
# query on a bogus document. Either nothing will be returned
# but without error, or a parsing error will occur.
db.query(xquery.format("ft:query(<doc/>, {search_text})",
search_text=query))
except ExistDBException as ex:
# The query is faulty.
if ex.message().startswith(
"exerr:ERROR Syntax error in Lucene query string"):
return False
# Reraise anything we're not testing for.
raise ex
# No error, the query string was good...
return True
def query_iterator(db, xquery, **kwargs):
# Copy it because we're going to change it.
kwargs = dict(kwargs)
if "how_many" not in kwargs:
kwargs["how_many"] = 1000
release = kwargs.get("release", None)
# When release is true it means that we want to release the xquery
# when we are done. However, we do not want to release the
# *individual* queries made to eXist.
if release:
del kwargs["release"]
done = 0 if "start" not in kwargs else kwargs["start"] - 1
query = None
session = None
hits = None
try:
while query is None or done < hits:
kwargs["start"] = done + 1
kwargs["cache"] = True if query is None else session
query = db.query(xquery, **kwargs)
# We grab everything we need before we pass it to the caller
# through yield. This way if the caller messes with these
# values, we're still safe.
session = query.session
hits = query.hits
done += query.count
yield query
finally:
if session is not None and release:
db.query(release=session)
#Grupo 3
#Hristo Ivanov Ivanov
#Alberto Lorente Sánchez
import eulexistdb.db
db = eulexistdb.db.ExistDB("http://*****:*****@name/string()}</elem>"""
r = db.query(q, how_many=0)
nodes = r.results
i=0
for node in nodes:
i+=1
print i, node.text
import eulexistdb.db
db = eulexistdb.db.ExistDB("http://localhost:8080/exist")
q ="""for $e in doc("/db/sgdi/factbook.xml")/mondial/country/name
return $e"""
r = db.query(q, start =1, how_many=0)
nodes = []
for e in r.results:
nodes += [e.text]
print nodes
