gardel/lightrag
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Changed node label from 'Entity' to 'base' and fix edge deletion error in PostgreSQL AGE graph

Browse Source
This commit is contained in:
yangdx
2025-04-02 14:03:56 +08:00
parent fc3208cf5b
commit 554d290993
1 changed files with 33 additions and 36 deletions
Download Patch File Download Diff File Expand all files Collapse all files

57
lightrag/kg/postgres_impl.py
View File

@@ -1258,7 +1258,7 @@ class PGGraphStorage(BaseGraphStorage):
entity_name_label = self._encode_graph_label(node_id.strip('"')) entity_name_label = self._encode_graph_label(node_id.strip('"'))
query = """SELECT * FROM cypher('%s', $$ query = """SELECT * FROM cypher('%s', $$
MATCH (n:Entity {node_id: "%s"}) MATCH (n:base {node_id: "%s"})
RETURN count(n) > 0 AS node_exists RETURN count(n) > 0 AS node_exists
$$) AS (node_exists bool)""" % (self.graph_name, entity_name_label) $$) AS (node_exists bool)""" % (self.graph_name, entity_name_label)
@@ -1271,7 +1271,7 @@ class PGGraphStorage(BaseGraphStorage):
tgt_label = self._encode_graph_label(target_node_id.strip('"')) tgt_label = self._encode_graph_label(target_node_id.strip('"'))
query = """SELECT * FROM cypher('%s', $$ query = """SELECT * FROM cypher('%s', $$
MATCH (a:Entity {node_id: "%s"})-[r]-(b:Entity {node_id: "%s"}) MATCH (a:base {node_id: "%s"})-[r]-(b:base {node_id: "%s"})
RETURN COUNT(r) > 0 AS edge_exists RETURN COUNT(r) > 0 AS edge_exists
$$) AS (edge_exists bool)""" % ( $$) AS (edge_exists bool)""" % (
self.graph_name, self.graph_name,
@@ -1286,7 +1286,7 @@ class PGGraphStorage(BaseGraphStorage):
async def get_node(self, node_id: str) -> dict[str, str] | None: async def get_node(self, node_id: str) -> dict[str, str] | None:
label = self._encode_graph_label(node_id.strip('"')) label = self._encode_graph_label(node_id.strip('"'))
query = """SELECT * FROM cypher('%s', $$ query = """SELECT * FROM cypher('%s', $$
MATCH (n:Entity {node_id: "%s"}) MATCH (n:base {node_id: "%s"})
RETURN n RETURN n
$$) AS (n agtype)""" % (self.graph_name, label) $$) AS (n agtype)""" % (self.graph_name, label)
record = await self._query(query) record = await self._query(query)
@@ -1301,7 +1301,7 @@ class PGGraphStorage(BaseGraphStorage):
label = self._encode_graph_label(node_id.strip('"')) label = self._encode_graph_label(node_id.strip('"'))
query = """SELECT * FROM cypher('%s', $$ query = """SELECT * FROM cypher('%s', $$
MATCH (n:Entity {node_id: "%s"})-[]->(x) MATCH (n:base {node_id: "%s"})-[]->(x)
RETURN count(x) AS total_edge_count RETURN count(x) AS total_edge_count
$$) AS (total_edge_count integer)""" % (self.graph_name, label) $$) AS (total_edge_count integer)""" % (self.graph_name, label)
record = (await self._query(query))[0] record = (await self._query(query))[0]
@@ -1329,7 +1329,7 @@ class PGGraphStorage(BaseGraphStorage):
tgt_label = self._encode_graph_label(target_node_id.strip('"')) tgt_label = self._encode_graph_label(target_node_id.strip('"'))
query = """SELECT * FROM cypher('%s', $$ query = """SELECT * FROM cypher('%s', $$
MATCH (a:Entity {node_id: "%s"})-[r]->(b:Entity {node_id: "%s"}) MATCH (a:base {node_id: "%s"})-[r]->(b:base {node_id: "%s"})
RETURN properties(r) as edge_properties RETURN properties(r) as edge_properties
LIMIT 1 LIMIT 1
$$) AS (edge_properties agtype)""" % ( $$) AS (edge_properties agtype)""" % (
@@ -1351,8 +1351,8 @@ class PGGraphStorage(BaseGraphStorage):
label = self._encode_graph_label(source_node_id.strip('"')) label = self._encode_graph_label(source_node_id.strip('"'))
query = """SELECT * FROM cypher('%s', $$ query = """SELECT * FROM cypher('%s', $$
MATCH (n:Entity {node_id: "%s"}) MATCH (n:base {node_id: "%s"})
OPTIONAL MATCH (n)-[]-(connected) OPTIONAL MATCH (n)-[]-(connected:base)
RETURN n, connected RETURN n, connected
$$) AS (n agtype, connected agtype)""" % ( $$) AS (n agtype, connected agtype)""" % (
self.graph_name, self.graph_name,
@@ -1396,7 +1396,7 @@ class PGGraphStorage(BaseGraphStorage):
properties = node_data properties = node_data
query = """SELECT * FROM cypher('%s', $$ query = """SELECT * FROM cypher('%s', $$
MERGE (n:Entity {node_id: "%s"}) MERGE (n:base {node_id: "%s"})
SET n += %s SET n += %s
RETURN n RETURN n
$$) AS (n agtype)""" % ( $$) AS (n agtype)""" % (
@@ -1433,9 +1433,9 @@ class PGGraphStorage(BaseGraphStorage):
edge_properties = edge_data edge_properties = edge_data
query = """SELECT * FROM cypher('%s', $$ query = """SELECT * FROM cypher('%s', $$
MATCH (source:Entity {node_id: "%s"}) MATCH (source:base {node_id: "%s"})
WITH source WITH source
MATCH (target:Entity {node_id: "%s"}) MATCH (target:base {node_id: "%s"})
MERGE (source)-[r:DIRECTED]->(target) MERGE (source)-[r:DIRECTED]->(target)
SET r += %s SET r += %s
RETURN r RETURN r
@@ -1466,7 +1466,7 @@ class PGGraphStorage(BaseGraphStorage):
label = self._encode_graph_label(node_id.strip('"')) label = self._encode_graph_label(node_id.strip('"'))
query = """SELECT * FROM cypher('%s', $$ query = """SELECT * FROM cypher('%s', $$
MATCH (n:Entity {node_id: "%s"}) MATCH (n:base {entity_id: "%s"})
DETACH DELETE n DETACH DELETE n
$$) AS (n agtype)""" % (self.graph_name, label) $$) AS (n agtype)""" % (self.graph_name, label)
@@ -1489,8 +1489,8 @@ class PGGraphStorage(BaseGraphStorage):
node_id_list = ", ".join([f'"{node_id}"' for node_id in encoded_node_ids]) node_id_list = ", ".join([f'"{node_id}"' for node_id in encoded_node_ids])
query = """SELECT * FROM cypher('%s', $$ query = """SELECT * FROM cypher('%s', $$
MATCH (n:Entity) MATCH (n:base)
WHERE n.node_id IN [%s] WHERE n.nentity_id IN [%s]
DETACH DELETE n DETACH DELETE n
$$) AS (n agtype)""" % (self.graph_name, node_id_list) $$) AS (n agtype)""" % (self.graph_name, node_id_list)
@@ -1507,25 +1507,20 @@ class PGGraphStorage(BaseGraphStorage):
Args: Args:
edges (list[tuple[str, str]]): A list of edges to remove, where each edge is a tuple of (source_node_id, target_node_id). edges (list[tuple[str, str]]): A list of edges to remove, where each edge is a tuple of (source_node_id, target_node_id).
""" """
encoded_edges = [ for source, target in edges:
( src_label = self._encode_graph_label(source.strip('"'))
self._encode_graph_label(src.strip('"')), tgt_label = self._encode_graph_label(target.strip('"'))
self._encode_graph_label(tgt.strip('"')),
)
for src, tgt in edges
]
edge_list = ", ".join([f'["{src}", "{tgt}"]' for src, tgt in encoded_edges])
query = """SELECT * FROM cypher('%s', $$ query = """SELECT * FROM cypher('%s', $$
MATCH (a:Entity)-[r]->(b:Entity) MATCH (a:base {node_id: "%s"})-[r]->(b:base {node_id: "%s"})
WHERE [a.node_id, b.node_id] IN [%s]
DELETE r DELETE r
$$) AS (r agtype)""" % (self.graph_name, edge_list) $$) AS (r agtype)""" % (self.graph_name, src_label, tgt_label)
try: try:
await self._query(query, readonly=False) await self._query(query, readonly=False)
logger.debug(f"Deleted edge from '{source}' to '{target}'")
except Exception as e: except Exception as e:
logger.error("Error during edge removal: {%s}", e) logger.error(f"Error during edge deletion: {str(e)}")
raise raise
async def get_all_labels(self) -> list[str]: async def get_all_labels(self) -> list[str]:
@@ -1537,8 +1532,10 @@ class PGGraphStorage(BaseGraphStorage):
""" """
query = ( query = (
"""SELECT * FROM cypher('%s', $$ """SELECT * FROM cypher('%s', $$
MATCH (n:Entity) MATCH (n:base)
RETURN DISTINCT n.node_id AS label WHERE n.entity_id IS NOT NULL
RETURN DISTINCT n.entity_id AS label
ORDER BY label
$$) AS (label text)""" $$) AS (label text)"""
% self.graph_name % self.graph_name
) )
@@ -1584,15 +1581,15 @@ class PGGraphStorage(BaseGraphStorage):
# Build the query based on whether we want the full graph or a specific subgraph. # Build the query based on whether we want the full graph or a specific subgraph.
if node_label == "*": if node_label == "*":
query = f"""SELECT * FROM cypher('{self.graph_name}', $$ query = f"""SELECT * FROM cypher('{self.graph_name}', $$
MATCH (n:Entity) MATCH (n:base)
OPTIONAL MATCH (n)-[r]->(m:Entity) OPTIONAL MATCH (n)-[r]->(m:base)
RETURN n, r, m RETURN n, r, m
LIMIT {MAX_GRAPH_NODES} LIMIT {MAX_GRAPH_NODES}
$$) AS (n agtype, r agtype, m agtype)""" $$) AS (n agtype, r agtype, m agtype)"""
else: else:
encoded_label = self._encode_graph_label(node_label.strip('"')) encoded_label = self._encode_graph_label(node_label.strip('"'))
query = f"""SELECT * FROM cypher('{self.graph_name}', $$ query = f"""SELECT * FROM cypher('{self.graph_name}', $$
MATCH (n:Entity {{node_id: "{encoded_label}"}}) MATCH (n:base {{entity_id: "{encoded_label}"}})
OPTIONAL MATCH p = (n)-[*..{max_depth}]-(m) OPTIONAL MATCH p = (n)-[*..{max_depth}]-(m)
RETURN nodes(p) AS nodes, relationships(p) AS relationships RETURN nodes(p) AS nodes, relationships(p) AS relationships
LIMIT {MAX_GRAPH_NODES} LIMIT {MAX_GRAPH_NODES}