使用 python 在 neo4j 中传递参数

Question

I want to pass parameter in CREATE using Python eg: '''

n = "abc"
a = 1234

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

''''

but it dosen't work.. any suggestions please

Answer 1

It actually depends on the Python driver that you are using to connect to Neo4j (check https://neo4j.com/developer/python/ to see the list of available drivers). If you are using the official neo4j-driver, the code you wrote is correct. In order execute the Cypher query, you could do something like this:

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()

Although âńōŋŷXmoůŜ's answer will probably work, it is not recommended way to it.

See also :

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

Answer 2

You can use the f-strings in Python. See example below. Note that

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})

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