Inject TiDB同LightRAG storage when needed

lightrag/lightrag.py

@@ -16,8 +16,6 @@ from .base import (
     QueryParam,
     StorageNameSpace,
 )
-from .kg.oracle_impl import OracleDB
-from .kg.postgres_impl import PostgreSQLDB
 from .namespace import NameSpace, make_namespace
 from .operate import (
     chunking_by_token_size,
@@ -446,6 +444,7 @@ class LightRAG:
             }
 
             # 初始化 OracleDB 对象
+            from .kg.oracle_impl import OracleDB
             oracle_db = OracleDB(dbconfig)
             # Check if DB tables exist, if not, tables will be created
             loop = always_get_an_event_loop()
@@ -459,6 +458,55 @@ class LightRAG:
             if self.graph_storage == "OracleGraphStorage":
                 self.graph_storage_cls.db = oracle_db
 
+        # 检查是否使用了 TiDB 存储实现
+        if (
+            self.kv_storage == "TiDBKVStorage"
+            or self.vector_storage == "TiDBVectorDBStorage"
+            or self.graph_storage == "TiDBGraphStorage"
+        ):
+            # 从环境变量或配置文件获取参数
+            dbconfig = {
+                "host": os.environ.get(
+                    "TIDB_HOST",
+                    config.get("tidb", "host", fallback="localhost"),
+                ),
+                "port": os.environ.get(
+                    "TIDB_PORT", 
+                    config.get("tidb", "port", fallback=4000)
+                ),
+                "user": os.environ.get(
+                    "TIDB_USER",
+                    config.get("tidb", "user", fallback=None),
+                ),
+                "password": os.environ.get(
+                    "TIDB_PASSWORD",
+                    config.get("tidb", "password", fallback=None),
+                ),
+                "database": os.environ.get(
+                    "TIDB_DATABASE",
+                    config.get("tidb", "database", fallback=None),
+                ),
+                "workspace": os.environ.get(
+                    "TIDB_WORKSPACE",
+                    config.get("tidb", "workspace", fallback="default"),
+                ),
+            }
+
+            # 初始化 TiDB 对象
+            from .kg.tidb_impl import TiDB
+            tidb_db = TiDB(dbconfig)
+            # Check if DB tables exist, if not, tables will be created
+            loop = always_get_an_event_loop()
+            loop.run_until_complete(tidb_db.check_tables())
+
+            # 只对 TiDB 实现的存储类注入 db 对象
+            if self.kv_storage == "TiDBKVStorage":
+                self.key_string_value_json_storage_cls.db = tidb_db
+            if self.vector_storage == "TiDBVectorDBStorage":
+                self.vector_db_storage_cls.db = tidb_db
+            if self.graph_storage == "TiDBGraphStorage":
+                self.graph_storage_cls.db = tidb_db
+
         # 检查是否使用了 PostgreSQL 存储实现
         if (
             self.kv_storage == "PGKVStorage"
@@ -498,6 +546,7 @@ class LightRAG:
             }
 
             # 初始化 PostgreSQLDB 对象
+            from .kg.postgres_impl import PostgreSQLDB
             postgres_db = PostgreSQLDB(dbconfig)
             # Initialize and check tables
             loop = always_get_an_event_loop()