refactor: The first refactored version for sdk release (#907)

Co-authored-by: chengfangyin2 <chengfangyin3@jd.com>

dbgpt/datasource/base.py

@@ -0,0 +1,59 @@
+#!/usr/bin/env python3
+# -*- coding:utf-8 -*-
+
+"""We need to design a base class.  That other connector can Write with this"""
+from abc import ABC, abstractmethod
+from typing import Any, Iterable, List, Optional
+
+
+class BaseConnect(ABC):
+    def get_connect(self, db_name: str):
+        pass
+
+    def get_table_names(self) -> Iterable[str]:
+        pass
+
+    def get_table_info(self, table_names: Optional[List[str]] = None) -> str:
+        pass
+
+    def get_index_info(self, table_names: Optional[List[str]] = None) -> str:
+        pass
+
+    def get_example_data(self, table: str, count: int = 3):
+        pass
+
+    def get_database_list(self):
+        pass
+
+    def get_database_names(self):
+        pass
+
+    def get_table_comments(self, db_name):
+        pass
+
+    def run(self, session, command: str, fetch: str = "all") -> List:
+        pass
+
+    def run_to_df(self, command: str, fetch: str = "all"):
+        pass
+
+    def get_users(self):
+        pass
+
+    def get_grants(self):
+        pass
+
+    def get_collation(self):
+        pass
+
+    def get_charset(self):
+        pass
+
+    def get_fields(self, table_name):
+        pass
+
+    def get_show_create_table(self, table_name):
+        pass
+
+    def get_indexes(self, table_name):
+        pass