def query_node(node_type=None, variable=None, **properties):
results = []
variable = str(variable) if variable is not None else "n"
cypher_command = "{match} RETURN {variable}".format(
match=NodeCommands.match_command_for_type(variable=variable,
node_type=node_type,
**properties),
variable=variable)
cypher_results = CypherOperations._execute(
[Operation(OperationType.RETRIEVE, command=cypher_command)])
results_data = [
row
for sub_results in [result.data() for result in cypher_results]
for row in sub_results
]
if len(results_data) == 0:
return results
for data in results_data:
result_value = data[variable]
if type(result_value) != Neo4jNode:
continue # maybe raise exception here
node_properties = {
Node.get_properties_mapping()[k]: v
for k, v in expand(result_value).items()
}
results.append(Node(**node_properties))
return results
def node_exist(node, variable=None):
variable = str(variable) if variable is not None else "n"
cypher_command = "{match} RETURN {variable}".format(
match=NodeCommands(node).match_command(variable=variable,
node_type=node.node_type),
variable=variable)
results = CypherOperations._execute(
[Operation(OperationType.RETRIEVE, command=cypher_command)])
results_data = [
row for sub_results in [result.data() for result in results]
for row in sub_results
]
if len(results_data) == 0:
return None
result_value = results_data[0][variable]
if type(result_value) != Neo4jNode:
return None # maybe raise exception here
node_properties = {
Node.get_properties_mapping()[k]: v
for k, v in expand(result_value).items()
}
node_properties["node_type"] = node.node_type
return Node(**node_properties) == node