feat(core): Support simple DB query for sdk (#917)

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

dbgpt/rag/summary/rdbms_db_summary.py

@@ -1,5 +1,7 @@
+from typing import List
 from dbgpt._private.config import Config
 from dbgpt.rag.summary.db_summary import DBSummary
+from dbgpt.datasource.rdbms.base import RDBMSDatabase
 
 CFG = Config()
 
@@ -36,32 +38,63 @@ class RdbmsSummary(DBSummary):
         example:
             table_name(column1(column1 comment),column2(column2 comment),column3(column3 comment) and index keys, and table comment: {table_comment})
         """
-        columns = []
-        for column in self.db._inspector.get_columns(table_name):
-            if column.get("comment"):
-                columns.append((f"{column['name']} ({column.get('comment')})"))
-            else:
-                columns.append(f"{column['name']}")
-
-        column_str = ", ".join(columns)
-        index_keys = []
-        for index_key in self.db._inspector.get_indexes(table_name):
-            key_str = ", ".join(index_key["column_names"])
-            index_keys.append(f"{index_key['name']}(`{key_str}`) ")
-        table_str = self.summary_template.format(
-            table_name=table_name, columns=column_str
-        )
-        if len(index_keys) > 0:
-            index_key_str = ", ".join(index_keys)
-            table_str += f", and index keys: {index_key_str}"
-        try:
-            comment = self.db._inspector.get_table_comment(table_name)
-        except Exception:
-            comment = dict(text=None)
-        if comment.get("text"):
-            table_str += f", and table comment: {comment.get('text')}"
-        return table_str
+        return _parse_table_summary(self.db, self.summary_template, table_name)
 
     def table_summaries(self):
         """Get table summaries."""
         return self.table_info_summaries
+
+
+def _parse_db_summary(
+    conn: RDBMSDatabase, summary_template: str = "{table_name}({columns})"
+) -> List[str]:
+    """Get db summary for database.
+
+    Args:
+        conn (RDBMSDatabase): database connection
+        summary_template (str): summary template
+    """
+    tables = conn.get_table_names()
+    table_info_summaries = [
+        _parse_table_summary(conn, summary_template, table_name)
+        for table_name in tables
+    ]
+    return table_info_summaries
+
+
+def _parse_table_summary(
+    conn: RDBMSDatabase, summary_template: str, table_name: str
+) -> str:
+    """Get table summary for table.
+
+    Args:
+        conn (RDBMSDatabase): database connection
+        summary_template (str): summary template
+        table_name (str): table name
+
+    Examples:
+        table_name(column1(column1 comment),column2(column2 comment),column3(column3 comment) and index keys, and table comment: {table_comment})
+    """
+    columns = []
+    for column in conn._inspector.get_columns(table_name):
+        if column.get("comment"):
+            columns.append(f"{column['name']} ({column.get('comment')})")
+        else:
+            columns.append(f"{column['name']}")
+
+    column_str = ", ".join(columns)
+    index_keys = []
+    for index_key in conn._inspector.get_indexes(table_name):
+        key_str = ", ".join(index_key["column_names"])
+        index_keys.append(f"{index_key['name']}(`{key_str}`) ")
+    table_str = summary_template.format(table_name=table_name, columns=column_str)
+    if len(index_keys) > 0:
+        index_key_str = ", ".join(index_keys)
+        table_str += f", and index keys: {index_key_str}"
+    try:
+        comment = conn._inspector.get_table_comment(table_name)
+    except Exception:
+        comment = dict(text=None)
+    if comment.get("text"):
+        table_str += f", and table comment: {comment.get('text')}"
+    return table_str