使用python在neo4j中传递参数

Question

我想用Python在CREATE中传递参数 例如： '''

n = "abc"
a = 1234

cqlCreate = "CREATE (cornell:university { name: $n,yob:$a})"

'''

但是它不起作用。。有什么建议吗

Answer 1

可以在Python中使用f字符串。见下面的例子。注意

1. You need to use {{ as escape character for {

2 You need to use \ as escape character for "

n = "abc"
a = 1234

cqlCreate = f"CREATE (cornell:university {{name: \"{n}\", yob: {a}}})"
print (cqlCreate)

Result:
CREATE (cornell:university {name: "abc", yob: 1234})

参考：https://www.python.org/dev/peps/pep-0498/

Answer 2

它实际上取决于您用来连接Neo4j的Python驱动程序（请检查https://neo4j.com/developer/python/以查看可用驱动程序的列表）。如果您使用的是官方的neo4j驱动程序，那么您编写的代码是正确的。为了执行密码查询，您可以执行以下操作：

from neo4j import GraphDatabase

uri = # insert neo4j uri
user = # insert neo4j username
password = # insert neo4j password

n = "abc"
a = 1234
query = "CREATE (cornell:university { name: $n,yob:$a})"

driver = GraphDatabase.driver(uri, auth=(user, password))
session = driver.session()
result = session.run(query, n=n, a=a)
session.close()
driver.close()

虽然–ōŏŷXmoůŜ的答案可能会奏效，但不建议采用这种方法

另见：

• https://neo4j.com/docs/api/python-driver/current/api.html