Neo4j langchain integration error

jakubMitura14 commented 2 months ago

Checked other resources

[X] I added a very descriptive title to this issue.
[X] I searched the LangChain documentation with the integrated search.
[X] I used the GitHub search to find a similar question and didn't find it.
[X] I am sure that this is a bug in LangChain rather than my code.
[X] The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package).

Example Code

I checked first connection and the following code works

from langchain.graphs import Neo4jGraph
from neo4j import GraphDatabase
url = "neo4j://localhost:7687"
username ="neo4j"
password = <password>

def _create_and_return_greeting(tx, message):
    result = tx.run("CREATE (a:Greeting) "
                    "SET a.message = $message "
                    "RETURN a.message + ', from node ' + id(a)", message=message)
    return result.single()[0]

message="hello, world"
driver=GraphDatabase.driver(url, auth=(username, password))
with driver.session() as session:
    greeting = session.execute_write(_create_and_return_greeting, message)
    print(greeting)

Hovewer trying to connect

graph = Neo4jGraph(url=url, username=username, password=password)

gives error

Error Message and Stack Trace (if applicable)

---------------------------------------------------------------------------
CypherSyntaxError                         Traceback (most recent call last)
[/usr/local/lib/python3.10/dist-packages/langchain_community/graphs/neo4j_graph.py](https://vscode-remote+dev-002dcontainer-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.vscode-resource.vscode-cdn.net/usr/local/lib/python3.10/dist-packages/langchain_community/graphs/neo4j_graph.py) in query(self, query, params)
    245             try:
--> 246                 data = session.run(Query(text=query, timeout=self.timeout), params)
    247                 json_data = [r.data() for r in data]

[/usr/local/lib/python3.10/dist-packages/neo4j/_sync/work/session.py](https://vscode-remote+dev-002dcontainer-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.vscode-resource.vscode-cdn.net/usr/local/lib/python3.10/dist-packages/neo4j/_sync/work/session.py) in run(self, query, parameters, **kwargs)
    312         parameters = dict(parameters or {}, **kwargs)
--> 313         self._auto_result._run(
    314             query, parameters, self._config.database,

[/usr/local/lib/python3.10/dist-packages/neo4j/_sync/work/result.py](https://vscode-remote+dev-002dcontainer-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.vscode-resource.vscode-cdn.net/usr/local/lib/python3.10/dist-packages/neo4j/_sync/work/result.py) in _run(self, query, parameters, db, imp_user, access_mode, bookmarks, notifications_min_severity, notifications_disabled_categories)
    180         self._connection.send_all()
--> 181         self._attach()
    182 

[/usr/local/lib/python3.10/dist-packages/neo4j/_sync/work/result.py](https://vscode-remote+dev-002dcontainer-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.vscode-resource.vscode-cdn.net/usr/local/lib/python3.10/dist-packages/neo4j/_sync/work/result.py) in _attach(self)
    300             while self._attached is False:
--> 301                 self._connection.fetch_message()
    302 

[/usr/local/lib/python3.10/dist-packages/neo4j/_sync/io/_common.py](https://vscode-remote+dev-002dcontainer-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.vscode-resource.vscode-cdn.net/usr/local/lib/python3.10/dist-packages/neo4j/_sync/io/_common.py) in inner(*args, **kwargs)
    177                 try:
--> 178                     func(*args, **kwargs)
    179                 except (Neo4jError, ServiceUnavailable, SessionExpired) as exc:

[/usr/local/lib/python3.10/dist-packages/neo4j/_sync/io/_bolt.py](https://vscode-remote+dev-002dcontainer-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.vscode-resource.vscode-cdn.net/usr/local/lib/python3.10/dist-packages/neo4j/_sync/io/_bolt.py) in fetch_message(self)
    849         )
--> 850         res = self._process_message(tag, fields)
    851         self.idle_since = monotonic()

[/usr/local/lib/python3.10/dist-packages/neo4j/_sync/io/_bolt4.py](https://vscode-remote+dev-002dcontainer-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.vscode-resource.vscode-cdn.net/usr/local/lib/python3.10/dist-packages/neo4j/_sync/io/_bolt4.py) in _process_message(self, tag, fields)
    367             try:
--> 368                 response.on_failure(summary_metadata or {})
    369             except (ServiceUnavailable, DatabaseUnavailable):

[/usr/local/lib/python3.10/dist-packages/neo4j/_sync/io/_common.py](https://vscode-remote+dev-002dcontainer-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.vscode-resource.vscode-cdn.net/usr/local/lib/python3.10/dist-packages/neo4j/_sync/io/_common.py) in on_failure(self, metadata)
    244         Util.callback(handler)
--> 245         raise Neo4jError.hydrate(**metadata)
    246 

CypherSyntaxError: {code: Neo.ClientError.Statement.SyntaxError} {message: Invalid input 'C': expected whitespace, comment, DATABASE, DATABASES, DEFAULT, POPULATED, ALL, ROLES, USERS or show privilege scope (line 1, column 6 (offset: 5))
"SHOW CONSTRAINTS"
      ^}

During handling of the above exception, another exception occurred:

ValueError                                Traceback (most recent call last)
[/tmp/ipykernel_3175/134052838.py](https://vscode-remote+dev-002dcontainer-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.vscode-resource.vscode-cdn.net/tmp/ipykernel_3175/134052838.py) in <module>
     27     print(greeting)
     28 
---> 29 graph = Neo4jGraph(url=url, username=username, password=password)
     30 # QUERY = """
     31 # "MATCH (m:Movie)-[:IN_GENRE]->(:Genre {name:$genre})

[/usr/local/lib/python3.10/dist-packages/langchain_community/graphs/neo4j_graph.py](https://vscode-remote+dev-002dcontainer-002b7b22686f737450617468223a222f6d656469612f6a6d2f686464446174612f70726f6a656374732f746879726f69645f6b6e6f776c656467655f6772617068222c226c6f63616c446f636b6572223a66616c73652c22636f6e66696746696c65223a7b22246d6964223a312c22667350617468223a222f6d656469612f6a6d2f686464446174612f70726f6a656374732f746879726f69645f6b6e6f776c656467655f67726170682f2e646576636f6e7461696e65722f646576636f6e7461696e65722e6a736f6e222c2265787465726e616c223a2266696c653a2f2f2f6d656469612f6a6d2f686464446174612f70726f6a656374732f746879726f69645f6b6e6f776c656467655f67726170682f2e646576636f6e7461696e65722f646576636f6e7461696e65722e6a736f6e222c2270617468223a222f6d656469612f6a6d2f686464446174612f70726f6a656374732f746879726f69645f6b6e6f776c656467655f67726170682f2e646576636f6e7461696e65722f646576636f6e7461696e65722e6a736f6e222c22736368656d65223a2266696c65227d7d.vscode-resource.vscode-cdn.net/usr/local/lib/python3.10/dist-packages/langchain_community/graphs/neo4j_graph.py) in __init__(self, url, username, password, database, timeout, sanitize, refresh_schema)
    217         if refresh_schema:
    218             try:
--> 219                 self.refresh_schema()
    220             except neo4j.exceptions.ClientError as e:
    221                 if e.code == "Neo.ClientError.Procedure.ProcedureNotFound":

[/usr/local/lib/python3.10/dist-packages/langchain_community/graphs/neo4j_graph.py](https://vscode-remote+dev-002dcontainer-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.vscode-resource.vscode-cdn.net/usr/local/lib/python3.10/dist-packages/langchain_community/graphs/neo4j_graph.py) in refresh_schema(self)
    281         # Get constraints & indexes
    282         try:
--> 283             constraint = self.query("SHOW CONSTRAINTS")
    284             index = self.query("SHOW INDEXES YIELD *")
    285         except (

[/usr/local/lib/python3.10/dist-packages/langchain_community/graphs/neo4j_graph.py](https://vscode-remote+dev-002dcontainer-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.vscode-resource.vscode-cdn.net/usr/local/lib/python3.10/dist-packages/langchain_community/graphs/neo4j_graph.py) in query(self, query, params)
    250                 return json_data
    251             except CypherSyntaxError as e:
--> 252                 raise ValueError(f"Generated Cypher Statement is not valid\n{e}")
    253 
    254     def refresh_schema(self) -> None:

ValueError: Generated Cypher Statement is not valid
{code: Neo.ClientError.Statement.SyntaxError} {message: Invalid input 'C': expected whitespace, comment, DATABASE, DATABASES, DEFAULT, POPULATED, ALL, ROLES, USERS or show privilege scope (line 1, column 6 (offset: 5))
"SHOW CONSTRAINTS"
      ^}

Description

I am trying to load Neo4jGraph from langchain_community.graphs. Issue is simmilar to https://github.com/langchain-ai/langchain/discussions/17643 ; Hovewer in cited issue no solution was supplied .

System Info

langchain==0.1.15 langchain-community==0.0.32 langchain-core==0.1.41 langchain-experimental==0.0.57 langchain-openai==0.1.2 langchain-text-splitters==0.0.1

Python 3.10.12

Docker Ubuntu 20

RamkumarManavalan commented 2 months ago

@jakubMitura14 , I am also facing the same issue recently, but it was working fine a few months ago. I use neo4j 4.3.9 python driver. Did you get to work around this by any means? Thanks.

jakubMitura14 commented 2 months ago

Yes it works now - for some reason connection with local neo4j do not work but when I build the neo4j docker from official repository and supply url to this it works

SyedBaqarAbbas commented 2 months ago

Solution: Update to a newer version of Neo4j

TL;DR: I faced the same issue because I had an older version of Neo4j, and there might be a change in Cypher syntax.

Explanation: When you create a Neo4jGraph object, it executes a method called refresh_schema, which refreshes the Neo4j graph schema information. This involves running two queries:

constraint = self.query("SHOW CONSTRAINTS")
index = self.query("SHOW INDEXES YIELD *")

In my version of Neo4j (4.1.1), attempting to run these queries resulted in an error. Therefore, it appears that the Cypher syntax has changed. Updating to a newer version of Neo4j will resolve this issue, which also explains why it works fine with Neo4j's Docker image.

reddiamond1234 commented 2 weeks ago

is there any other workaround than upgrading to newer version?

langchain-ai / langchain