feat: add GraphRAG framework and integrate TuGraph (#1506)

Co-authored-by: KingSkyLi <15566300566@163.com>
Co-authored-by: aries_ckt <916701291@qq.com>
Co-authored-by: Fangyin Cheng <staneyffer@gmail.com>

dbgpt/storage/graph_store/neo4j_store.py

@@ -0,0 +1,64 @@
+"""Neo4j vector store."""
+import logging
+from typing import List, Optional, Tuple
+
+from dbgpt._private.pydantic import ConfigDict
+from dbgpt.storage.graph_store.base import GraphStoreBase, GraphStoreConfig
+from dbgpt.storage.graph_store.graph import Direction, Graph, MemoryGraph
+
+logger = logging.getLogger(__name__)
+
+
+class Neo4jStoreConfig(GraphStoreConfig):
+    """Neo4j store config."""
+
+    model_config = ConfigDict(arbitrary_types_allowed=True)
+
+
+class Neo4jStore(GraphStoreBase):
+    """Neo4j graph store."""
+
+    # todo: add neo4j implementation
+
+    def __init__(self, graph_store_config: Neo4jStoreConfig):
+        """Initialize the Neo4jStore with connection details."""
+        pass
+
+    def insert_triplet(self, sub: str, rel: str, obj: str):
+        """Insert triplets."""
+        pass
+
+    def get_triplets(self, sub: str) -> List[Tuple[str, str]]:
+        """Get triplets."""
+        return []
+
+    def delete_triplet(self, sub: str, rel: str, obj: str):
+        """Delete triplets."""
+        pass
+
+    def drop(self):
+        """Drop graph."""
+        pass
+
+    def get_schema(self, refresh: bool = False) -> str:
+        """Get schema."""
+        return ""
+
+    def get_full_graph(self, limit: Optional[int] = None) -> Graph:
+        """Get full graph."""
+        return MemoryGraph()
+
+    def explore(
+        self,
+        subs: List[str],
+        direct: Direction = Direction.BOTH,
+        depth: Optional[int] = None,
+        fan: Optional[int] = None,
+        limit: Optional[int] = None,
+    ) -> Graph:
+        """Explore the graph from given subjects up to a depth."""
+        return MemoryGraph()
+
+    def query(self, query: str, **args) -> Graph:
+        """Execute a query on graph."""
+        return MemoryGraph()