def get_node(self, req: Node) -> Optional[List[Node]]:
builder = QueryBuilder()
if req.get_entity() is not None:
builder.add(f"MATCH (n:{req.get_entity()}")
if req.get_meta() is not None and len(req.get_meta()) > 0:
builder.add_meta(req.get_meta())
else:
builder.add(f"MATCH (n")
if req.get_properties() is not None:
properties = dict(
(x, y) for x, y in req.get_properties().items() if y != "")
if len(properties) > 0:
builder.add_parameters(properties)
builder.add(")")
if req.get_relationships() is not None:
counter: int = 0
for key, value in req.get_relationships().items():
if len(value) > 0:
builder.add(
f"MATCH (n)-[r{counter}:{key}]-(m{counter}) WHERE ID(m{counter}) IN {str(value)}"
)
counter += 1
builder.add("RETURN COLLECT(ID(n)) AS ids")
records = self._exec_query(builder.get())[0]
result_nodes: List[Node] = [] # nodes from result
if len(records) > 0:
for record in records:
result_node = self.get_node_by_id(int(record))
result_nodes.append(result_node[0])
return result_nodes
def create_node(self, req: Node) -> Optional[Node]:
builder = QueryBuilder()
builder.add("CREATE (a:" + req.get_entity())
if req.get_meta() is not None and len(req.get_meta()) > 0:
builder.add_meta(req.get_meta())
builder.add_parameters(req.get_properties()).add(") RETURN a")
record: Neo4jNode = self._exec_query(builder.get())[0]
req.set_id(int(record.id))
return req