Question

我有一个变量命名=＆＃34;的Rahul＆＃34; 和，我想以下列方式将此变量传递给Py2neo中的cypher查询：

line=session.execute("MATCH (person)WHERE person.name=name RETURN person")

但是我收到了错误 -

"py2neo.cypher.InvalidSyntax: name not defined (line 1, column 33)"

如何在py2neo中传递变量

Answer 1

如果name是参数，则需要将其括在花括号中。您的查询应该类似于

MATCH (person) WHERE person.name = {name} RETURN person

您的Python代码可能会看到以下几行

graph_db = neo4j.GraphDatabaseService()
qs = 'MATCH (person) WHERE person.name = {name} RETURN person'
query = neo4j.CypherQuery(graph_db, qs)
results = query.execute(name='Rahul')
print results

Answer 2

如果您想在事务中包装查询，可以使用cypher模块创建会话，然后创建事务对象。执行此操作的语法与neo4j.CypherQuery中的from py2neo import neo4j, cypher graph_db = neo4j.GraphDatabaseService('http://localhost:7474/db/data/') # Create a Session session = cypher.Session('http://localhost:7474') # Create a transaction tx = session.create_transaction() # Write your query, and then include it in the transaction with a dictionary # of parameters. qs = 'MATCH (person) WHERE person.name = {name} RETURN person' tx.append(qs, parameters={'name': 'Rahul'}) results = tx.commit()略有不同，在stephenmuss的答案中提到。

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Answer 3

获取节点的另一种方法是：

from py2neo import Graph, authenticate

server = "localhost:7474"

# set up authentication parameters
authenticate(server, <user>, <password>)

graph = Graph("{0}/db/data".format(server))
results = graph.find("person", "name", "Rahul")

如何在py2neo中将参数传递给cypher查询

3 个答案: