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| <h1>Source code for airflow.operators.mssql_to_hive</h1><div class="highlight"><pre> |
| <span></span><span class="c1"># -*- coding: utf-8 -*-</span> |
| <span class="c1">#</span> |
| <span class="c1"># Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="c1"># or more contributor license agreements. See the NOTICE file</span> |
| <span class="c1"># distributed with this work for additional information</span> |
| <span class="c1"># regarding copyright ownership. The ASF licenses this file</span> |
| <span class="c1"># to you under the Apache License, Version 2.0 (the</span> |
| <span class="c1"># "License"); you may not use this file except in compliance</span> |
| <span class="c1"># with the License. You may obtain a copy of the License at</span> |
| <span class="c1">#</span> |
| <span class="c1"># http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="c1">#</span> |
| <span class="c1"># Unless required by applicable law or agreed to in writing,</span> |
| <span class="c1"># software distributed under the License is distributed on an</span> |
| <span class="c1"># "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</span> |
| <span class="c1"># KIND, either express or implied. See the License for the</span> |
| <span class="c1"># specific language governing permissions and limitations</span> |
| <span class="c1"># under the License.</span> |
| |
| <span class="kn">from</span> <span class="nn">builtins</span> <span class="k">import</span> <span class="nb">chr</span> |
| <span class="kn">from</span> <span class="nn">collections</span> <span class="k">import</span> <span class="n">OrderedDict</span> |
| <span class="kn">import</span> <span class="nn">unicodecsv</span> <span class="k">as</span> <span class="nn">csv</span> |
| <span class="kn">from</span> <span class="nn">tempfile</span> <span class="k">import</span> <span class="n">NamedTemporaryFile</span> |
| <span class="kn">import</span> <span class="nn">pymssql</span> |
| |
| <span class="kn">from</span> <span class="nn">airflow.hooks.hive_hooks</span> <span class="k">import</span> <span class="n">HiveCliHook</span> |
| <span class="kn">from</span> <span class="nn">airflow.hooks.mssql_hook</span> <span class="k">import</span> <span class="n">MsSqlHook</span> |
| <span class="kn">from</span> <span class="nn">airflow.models</span> <span class="k">import</span> <span class="n">BaseOperator</span> |
| <span class="kn">from</span> <span class="nn">airflow.utils.decorators</span> <span class="k">import</span> <span class="n">apply_defaults</span> |
| |
| |
| <div class="viewcode-block" id="MsSqlToHiveTransfer"><a class="viewcode-back" href="../../../code.html#airflow.operators.mssql_to_hive.MsSqlToHiveTransfer">[docs]</a><span class="k">class</span> <span class="nc">MsSqlToHiveTransfer</span><span class="p">(</span><span class="n">BaseOperator</span><span class="p">):</span> |
| <span class="sd">"""</span> |
| <span class="sd"> Moves data from Microsoft SQL Server to Hive. The operator runs</span> |
| <span class="sd"> your query against Microsoft SQL Server, stores the file locally</span> |
| <span class="sd"> before loading it into a Hive table. If the ``create`` or</span> |
| <span class="sd"> ``recreate`` arguments are set to ``True``,</span> |
| <span class="sd"> a ``CREATE TABLE`` and ``DROP TABLE`` statements are generated.</span> |
| <span class="sd"> Hive data types are inferred from the cursor's metadata.</span> |
| <span class="sd"> Note that the table generated in Hive uses ``STORED AS textfile``</span> |
| <span class="sd"> which isn't the most efficient serialization format. If a</span> |
| <span class="sd"> large amount of data is loaded and/or if the table gets</span> |
| <span class="sd"> queried considerably, you may want to use this operator only to</span> |
| <span class="sd"> stage the data into a temporary table before loading it into its</span> |
| <span class="sd"> final destination using a ``HiveOperator``.</span> |
| |
| <span class="sd"> :param sql: SQL query to execute against the Microsoft SQL Server</span> |
| <span class="sd"> database. (templated)</span> |
| <span class="sd"> :type sql: str</span> |
| <span class="sd"> :param hive_table: target Hive table, use dot notation to target a specific</span> |
| <span class="sd"> database. (templated)</span> |
| <span class="sd"> :type hive_table: str</span> |
| <span class="sd"> :param create: whether to create the table if it doesn't exist</span> |
| <span class="sd"> :type create: bool</span> |
| <span class="sd"> :param recreate: whether to drop and recreate the table at every execution</span> |
| <span class="sd"> :type recreate: bool</span> |
| <span class="sd"> :param partition: target partition as a dict of partition columns and</span> |
| <span class="sd"> values. (templated)</span> |
| <span class="sd"> :type partition: dict</span> |
| <span class="sd"> :param delimiter: field delimiter in the file</span> |
| <span class="sd"> :type delimiter: str</span> |
| <span class="sd"> :param mssql_conn_id: source Microsoft SQL Server connection</span> |
| <span class="sd"> :type mssql_conn_id: str</span> |
| <span class="sd"> :param hive_conn_id: destination hive connection</span> |
| <span class="sd"> :type hive_conn_id: str</span> |
| <span class="sd"> :param tblproperties: TBLPROPERTIES of the hive table being created</span> |
| <span class="sd"> :type tblproperties: dict</span> |
| <span class="sd"> """</span> |
| |
| <span class="n">template_fields</span> <span class="o">=</span> <span class="p">(</span><span class="s1">'sql'</span><span class="p">,</span> <span class="s1">'partition'</span><span class="p">,</span> <span class="s1">'hive_table'</span><span class="p">)</span> |
| <span class="n">template_ext</span> <span class="o">=</span> <span class="p">(</span><span class="s1">'.sql'</span><span class="p">,)</span> |
| <span class="n">ui_color</span> <span class="o">=</span> <span class="s1">'#a0e08c'</span> |
| |
| <span class="nd">@apply_defaults</span> |
| <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span> |
| <span class="bp">self</span><span class="p">,</span> |
| <span class="n">sql</span><span class="p">,</span> |
| <span class="n">hive_table</span><span class="p">,</span> |
| <span class="n">create</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> |
| <span class="n">recreate</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> |
| <span class="n">partition</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> |
| <span class="n">delimiter</span><span class="o">=</span><span class="nb">chr</span><span class="p">(</span><span class="mi">1</span><span class="p">),</span> |
| <span class="n">mssql_conn_id</span><span class="o">=</span><span class="s1">'mssql_default'</span><span class="p">,</span> |
| <span class="n">hive_cli_conn_id</span><span class="o">=</span><span class="s1">'hive_cli_default'</span><span class="p">,</span> |
| <span class="n">tblproperties</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> |
| <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span> |
| <span class="nb">super</span><span class="p">(</span><span class="n">MsSqlToHiveTransfer</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">sql</span> <span class="o">=</span> <span class="n">sql</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">hive_table</span> <span class="o">=</span> <span class="n">hive_table</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">partition</span> <span class="o">=</span> <span class="n">partition</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">create</span> <span class="o">=</span> <span class="n">create</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">recreate</span> <span class="o">=</span> <span class="n">recreate</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">delimiter</span> <span class="o">=</span> <span class="n">delimiter</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">mssql_conn_id</span> <span class="o">=</span> <span class="n">mssql_conn_id</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">hive_cli_conn_id</span> <span class="o">=</span> <span class="n">hive_cli_conn_id</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">partition</span> <span class="o">=</span> <span class="n">partition</span> <span class="ow">or</span> <span class="p">{}</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">tblproperties</span> <span class="o">=</span> <span class="n">tblproperties</span> |
| |
| <span class="nd">@classmethod</span> |
| <span class="k">def</span> <span class="nf">type_map</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="n">mssql_type</span><span class="p">):</span> |
| <span class="n">t</span> <span class="o">=</span> <span class="n">pymssql</span> |
| <span class="n">d</span> <span class="o">=</span> <span class="p">{</span> |
| <span class="n">t</span><span class="o">.</span><span class="n">BINARY</span><span class="o">.</span><span class="n">value</span><span class="p">:</span> <span class="s1">'INT'</span><span class="p">,</span> |
| <span class="n">t</span><span class="o">.</span><span class="n">DECIMAL</span><span class="o">.</span><span class="n">value</span><span class="p">:</span> <span class="s1">'FLOAT'</span><span class="p">,</span> |
| <span class="n">t</span><span class="o">.</span><span class="n">NUMBER</span><span class="o">.</span><span class="n">value</span><span class="p">:</span> <span class="s1">'INT'</span><span class="p">,</span> |
| <span class="p">}</span> |
| <span class="k">return</span> <span class="n">d</span><span class="p">[</span><span class="n">mssql_type</span><span class="p">]</span> <span class="k">if</span> <span class="n">mssql_type</span> <span class="ow">in</span> <span class="n">d</span> <span class="k">else</span> <span class="s1">'STRING'</span> |
| |
| <span class="k">def</span> <span class="nf">execute</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">context</span><span class="p">):</span> |
| <span class="n">hive</span> <span class="o">=</span> <span class="n">HiveCliHook</span><span class="p">(</span><span class="n">hive_cli_conn_id</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">hive_cli_conn_id</span><span class="p">)</span> |
| <span class="n">mssql</span> <span class="o">=</span> <span class="n">MsSqlHook</span><span class="p">(</span><span class="n">mssql_conn_id</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">mssql_conn_id</span><span class="p">)</span> |
| |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">"Dumping Microsoft SQL Server query results to local file"</span><span class="p">)</span> |
| <span class="n">conn</span> <span class="o">=</span> <span class="n">mssql</span><span class="o">.</span><span class="n">get_conn</span><span class="p">()</span> |
| <span class="n">cursor</span> <span class="o">=</span> <span class="n">conn</span><span class="o">.</span><span class="n">cursor</span><span class="p">()</span> |
| <span class="n">cursor</span><span class="o">.</span><span class="n">execute</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">sql</span><span class="p">)</span> |
| <span class="k">with</span> <span class="n">NamedTemporaryFile</span><span class="p">(</span><span class="s2">"w"</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span> |
| <span class="n">csv_writer</span> <span class="o">=</span> <span class="n">csv</span><span class="o">.</span><span class="n">writer</span><span class="p">(</span><span class="n">f</span><span class="p">,</span> <span class="n">delimiter</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">delimiter</span><span class="p">,</span> <span class="n">encoding</span><span class="o">=</span><span class="s1">'utf-8'</span><span class="p">)</span> |
| <span class="n">field_dict</span> <span class="o">=</span> <span class="n">OrderedDict</span><span class="p">()</span> |
| <span class="n">col_count</span> <span class="o">=</span> <span class="mi">0</span> |
| <span class="k">for</span> <span class="n">field</span> <span class="ow">in</span> <span class="n">cursor</span><span class="o">.</span><span class="n">description</span><span class="p">:</span> |
| <span class="n">col_count</span> <span class="o">+=</span> <span class="mi">1</span> |
| <span class="n">col_position</span> <span class="o">=</span> <span class="s2">"Column</span><span class="si">{position}</span><span class="s2">"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">position</span><span class="o">=</span><span class="n">col_count</span><span class="p">)</span> |
| <span class="n">field_dict</span><span class="p">[</span><span class="n">col_position</span> <span class="k">if</span> <span class="n">field</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">==</span> <span class="s1">''</span> <span class="k">else</span> <span class="n">field</span><span class="p">[</span><span class="mi">0</span><span class="p">]]</span> \ |
| <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">type_map</span><span class="p">(</span><span class="n">field</span><span class="p">[</span><span class="mi">1</span><span class="p">])</span> |
| <span class="n">csv_writer</span><span class="o">.</span><span class="n">writerows</span><span class="p">(</span><span class="n">cursor</span><span class="p">)</span> |
| <span class="n">f</span><span class="o">.</span><span class="n">flush</span><span class="p">()</span> |
| <span class="n">cursor</span><span class="o">.</span><span class="n">close</span><span class="p">()</span> |
| <span class="n">conn</span><span class="o">.</span><span class="n">close</span><span class="p">()</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">"Loading file into Hive"</span><span class="p">)</span> |
| <span class="n">hive</span><span class="o">.</span><span class="n">load_file</span><span class="p">(</span> |
| <span class="n">f</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">hive_table</span><span class="p">,</span> |
| <span class="n">field_dict</span><span class="o">=</span><span class="n">field_dict</span><span class="p">,</span> |
| <span class="n">create</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">create</span><span class="p">,</span> |
| <span class="n">partition</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">partition</span><span class="p">,</span> |
| <span class="n">delimiter</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">delimiter</span><span class="p">,</span> |
| <span class="n">recreate</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">recreate</span><span class="p">,</span> |
| <span class="n">tblproperties</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">tblproperties</span><span class="p">)</span></div> |
| </pre></div> |
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