pgsql engine: 在查询模式下启用只读事务，工单执行启用读写事务,避免在查询模式下被函数修改数据

sql/engines/pgsql.py

@@ -187,12 +187,14 @@ def query(
         result_set = ResultSet(full_sql=sql)
         try:
             conn = self.get_connection(db_name=db_name)
+            conn.autocommit = False
             max_execution_time = kwargs.get("max_execution_time", 0)
             cursor = conn.cursor()
             try:
                 cursor.execute(f"SET statement_timeout TO {max_execution_time};")
             except:
                 pass
+            cursor.execute("SET transaction ISOLATION LEVEL READ COMMITTED READ ONLY;")
             if schema_name:
                 cursor.execute(
                     f"SET search_path TO %(schema_name)s;", {"schema_name": schema_name}
@@ -203,6 +205,7 @@ def query(
                 rows = cursor.fetchmany(size=int(limit_num))
             else:
                 rows = cursor.fetchall()
+            conn.commit()
             fields = cursor.description
             column_type_codes = [i[1] for i in fields] if fields else []
             # 定义 JSON 和 JSONB 的 type_code,# 114 是 json，3802 是 jsonb
@@ -231,6 +234,7 @@ def query(
             result_set.rows = converted_rows
             result_set.affected_rows = len(converted_rows)
         except Exception as e:
+            conn.rollback()
             logger.warning(
                 f"PgSQL命令执行报错，语句：{sql}， 错误信息：{traceback.format_exc()}"
             )
@@ -324,13 +328,14 @@ def execute_workflow(self, workflow, close_conn=True):
         db_name = workflow.db_name
         try:
             conn = self.get_connection(db_name=db_name)
+            conn.autocommit = False
             cursor = conn.cursor()
+            cursor.execute("SET transaction ISOLATION LEVEL READ COMMITTED READ WRITE;")
             # 逐条执行切分语句，追加到执行结果中
             for statement in split_sql:
                 statement = statement.rstrip(";")
                 with FuncTimer() as t:
                     cursor.execute(statement)
-                    conn.commit()
                 execute_result.rows.append(
                     ReviewResult(
                         id=line,
@@ -343,7 +348,9 @@ def execute_workflow(self, workflow, close_conn=True):
                     )
                 )
                 line += 1
+            conn.commit()
         except Exception as e:
+            conn.rollback()
             logger.warning(
                 f"PGSQL命令执行报错，语句：{statement or sql}， 错误信息：{traceback.format_exc()}"
             )