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kg.py
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kg.py
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from neo4j import GraphDatabase
class KGDatabase:
def __init__(self, uri, user, password):
self.driver = GraphDatabase.driver(uri, auth=(user, password))
def close(self):
self.driver.close()
@staticmethod
def _get_nodes_of_ontology(tx, onto):
query = f'MATCH (node:`{onto}`) return node\n'
results = tx.run(query)
return [record.data()['node'] for record in results]
def get_nodes_of_ontology(self, onto):
with self.driver.session() as session:
results = session.read_transaction(self._get_nodes_of_ontology, onto)
return results
@staticmethod
def _get_types_of_ontology(tx, onto):
query = f'MATCH (node:`{onto}`) return node\n'
results = tx.run(query)
types = set()
for record in results:
types.add(record.data()['node']['type'])
return list(types)
def get_types_of_ontology(self, onto):
with self.driver.session() as session:
results = session.read_transaction(self._get_types_of_ontology, onto)
return results
def get_nodes_of_type(self, ntype):
with self.driver.session() as session:
results = session.read_transaction(self._get_nodes_of_type, ntype)
return results
@staticmethod
def _get_nodes_of_type(tx, ntype):
query = 'MATCH (node {type: "' + f'{ntype}' + '"}) return node\n'
results = tx.run(query)
return [record.data()['node'] for record in results]
def get_related_ontologies(self, onto):
with self.driver.session() as session:
results = session.read_transaction(self._get_related_ontologies, onto)
types = set()
for record in results:
if record.data()['LABELS(node2)'][0] not in ['任务']:
types.add(record.data()['LABELS(node2)'][0])
return list(types)
@staticmethod
def _get_related_ontologies(tx, onto):
query = f'MATCH (node1:{onto}) -- (node2) return LABELS(node2)\n'
results = tx.run(query)
return [record for record in results]
def get_ego_graphs(self, onto1, onto2):
with self.driver.session() as session:
results = session.read_transaction(self._get_ego_graphs, onto1, onto2)
graphs = {}
id2node = {}
for record in results:
node1 = record['node1']
node2 = record['node2']
if node1['id'] not in graphs:
graphs[node1['id']] = []
id2node[node1['id']] = node1
graphs[node1['id']].append(node2)
results = []
for key in graphs:
results.append({
'center': id2node[key],
'nodes': graphs[key]
})
return results
@staticmethod
def _get_ego_graphs(tx, onto1, onto2):
query = f'MATCH (node1:{onto1}) -- (node2:{onto2}) return node1, node2\n'
results = tx.run(query)
return [record.data() for record in results]
def get_ego_graph(self, nodeid):
with self.driver.session() as session:
results = session.read_transaction(self._get_ego_graph, nodeid)
return results
@staticmethod
def _get_ego_graph(tx, nodeid):
query = 'MATCH (n {id:' + str(nodeid) + '}) -- (node) return node\n'
results = tx.run(query)
return [record.data()['node'] for record in results]
def get_nodes_with_location(self, onto):
with self.driver.session() as session:
results = session.read_transaction(self._get_nodes_with_location, onto)
if onto in ['人物', '历史记录']:
for record in results:
record['node1']['x'] = record['node2']['x']
record['node1']['y'] = record['node2']['y']
return [record['node1'] for record in results]
else:
return results
@staticmethod
def _get_nodes_with_location(tx, onto):
if onto in ['物体', '环境']:
query = f'MATCH (node : {onto}) return node\n'
results = tx.run(query)
return [record.data()['node'] for record in results]
elif onto in ['人物', '历史记录']:
query = f'MATCH (node1 : {onto}) -- (node2:环境) return node1, node2\n'
results = tx.run(query)
return [record.data() for record in results]
else:
return []
def get_task_timeline(self, task):
with self.driver.session() as session:
results = session.read_transaction(self._get_task_timeline, task)
return results
@staticmethod
def _get_task_timeline(tx, task):
output = []
query = 'MATCH (n : 任务 {name: "' + task + '"}) -- (node {type:"行为步骤"}) return node\n'
results = tx.run(query)
nodes = [record.data()['node'] for record in results]
if len(nodes) > 0:
node = nodes[0]
query = 'MATCH (node1 {id:' + str(node['id']) + '}) -[r:下一步*1..]- (node2 {type:"行为步骤"}) return node1, node2\n'
results = tx.run(query)
nodes = [node] + [record.data()['node2'] for record in results]
for node in nodes:
query = 'MATCH (node1 {id:' + str(node['id']) + '}) -- (node2) return node2\n'
results = tx.run(query)
related = [record.data()['node2'] for record in results]
related = [node for node in related if node['ontology'] != '任务']
output.append({
'action': node,
'related': related
})
return output;
def get_node(self, name):
with self.driver.session() as session:
results = session.read_transaction(self._get_node, name)
return results
@staticmethod
def _get_node(tx, name):
query = 'MATCH (node {name: "' + f'{name}' + '"}) return node\n'
results = tx.run(query)
return [record.data()['node'] for record in results][0]