Fix edit entity and relation bugs

lightrag/kg/tidb_impl.py

@@ -414,6 +414,55 @@ class TiDBVectorDBStorage(BaseVectorStorage):
         # Ti handles persistence automatically
         pass
 
+    async def search_by_prefix(self, prefix: str) -> list[dict[str, Any]]:
+        """Search for records with IDs starting with a specific prefix.
+
+        Args:
+            prefix: The prefix to search for in record IDs
+
+        Returns:
+            List of records with matching ID prefixes
+        """
+        # Determine which table to query based on namespace
+        if self.namespace == NameSpace.VECTOR_STORE_ENTITIES:
+            sql_template = """
+                SELECT entity_id as id, name as entity_name, entity_type, description, content
+                FROM LIGHTRAG_GRAPH_NODES
+                WHERE entity_id LIKE :prefix_pattern AND workspace = :workspace
+            """
+        elif self.namespace == NameSpace.VECTOR_STORE_RELATIONSHIPS:
+            sql_template = """
+                SELECT relation_id as id, source_name as src_id, target_name as tgt_id,
+                       keywords, description, content
+                FROM LIGHTRAG_GRAPH_EDGES
+                WHERE relation_id LIKE :prefix_pattern AND workspace = :workspace
+            """
+        elif self.namespace == NameSpace.VECTOR_STORE_CHUNKS:
+            sql_template = """
+                SELECT chunk_id as id, content, tokens, chunk_order_index, full_doc_id
+                FROM LIGHTRAG_DOC_CHUNKS
+                WHERE chunk_id LIKE :prefix_pattern AND workspace = :workspace
+            """
+        else:
+            logger.warning(
+                f"Namespace {self.namespace} not supported for prefix search"
+            )
+            return []
+
+        # Add prefix pattern parameter with % for SQL LIKE
+        prefix_pattern = f"{prefix}%"
+        params = {"prefix_pattern": prefix_pattern, "workspace": self.db.workspace}
+
+        try:
+            results = await self.db.query(sql_template, params=params, multirows=True)
+            logger.debug(
+                f"Found {len(results) if results else 0} records with prefix '{prefix}'"
+            )
+            return results if results else []
+        except Exception as e:
+            logger.error(f"Error searching records with prefix '{prefix}': {e}")
+            return []
+
 
 @final
 @dataclass
@@ -968,4 +1017,20 @@ SQL_TEMPLATES = {
         WHERE (source_name = :source AND target_name = :target)
         AND workspace = :workspace
     """,
+    # Search by prefix SQL templates
+    "search_entity_by_prefix": """
+        SELECT entity_id as id, name as entity_name, entity_type, description, content
+        FROM LIGHTRAG_GRAPH_NODES
+        WHERE entity_id LIKE :prefix_pattern AND workspace = :workspace
+    """,
+    "search_relationship_by_prefix": """
+        SELECT relation_id as id, source_name as src_id, target_name as tgt_id, keywords, description, content
+        FROM LIGHTRAG_GRAPH_EDGES
+        WHERE relation_id LIKE :prefix_pattern AND workspace = :workspace
+    """,
+    "search_chunk_by_prefix": """
+        SELECT chunk_id as id, content, tokens, chunk_order_index, full_doc_id
+        FROM LIGHTRAG_DOC_CHUNKS
+        WHERE chunk_id LIKE :prefix_pattern AND workspace = :workspace
+    """,
 }