| # Licensed to the Apache Software Foundation (ASF) under one |
| # or more contributor license agreements. See the NOTICE file |
| # distributed with this work for additional information |
| # regarding copyright ownership. The ASF licenses this file |
| # to you under the Apache License, Version 2.0 (the |
| # "License"); you may not use this file except in compliance |
| # with the License. You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, |
| # software distributed under the License is distributed on an |
| # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| # KIND, either express or implied. See the License for the |
| # specific language governing permissions and limitations |
| # under the License. |
| # |
| # Utilities for interacting with Hive. |
| |
| |
| class HiveDbWrapper(object): |
| """ |
| A wrapper class for using `with` guards with databases created through Hive |
| ensuring deletion even if an exception occurs. |
| """ |
| |
| def __init__(self, hive, db_name): |
| self.hive = hive |
| self.db_name = db_name |
| |
| def __enter__(self): |
| self.hive.run_stmt_in_hive( |
| 'create database if not exists ' + self.db_name) |
| return self.db_name |
| |
| def __exit__(self, typ, value, traceback): |
| self.hive.run_stmt_in_hive( |
| 'drop database if exists %s cascade' % self.db_name) |
| |
| |
| class HiveTableWrapper(object): |
| """ |
| A wrapper class for using `with` guards with tables created through Hive |
| ensuring deletion even if an exception occurs. |
| """ |
| |
| def __init__(self, hive, table_name, table_spec): |
| self.hive = hive |
| self.table_name = table_name |
| self.table_spec = table_spec |
| |
| def __enter__(self): |
| self.hive.run_stmt_in_hive( |
| 'create table if not exists %s %s' % |
| (self.table_name, self.table_spec)) |
| return self.table_name |
| |
| def __exit__(self, typ, value, traceback): |
| self.hive.run_stmt_in_hive('drop table if exists %s' % self.table_name) |