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<h1>Source code for airflow.hooks.oracle_hook</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"># &quot;License&quot;); 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"># &quot;AS IS&quot; 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">import</span> <span class="nn">cx_Oracle</span>
<span class="kn">from</span> <span class="nn">airflow.hooks.dbapi_hook</span> <span class="k">import</span> <span class="n">DbApiHook</span>
<span class="kn">from</span> <span class="nn">builtins</span> <span class="k">import</span> <span class="nb">str</span>
<span class="kn">from</span> <span class="nn">past.builtins</span> <span class="k">import</span> <span class="n">basestring</span>
<span class="kn">from</span> <span class="nn">datetime</span> <span class="k">import</span> <span class="n">datetime</span>
<span class="kn">import</span> <span class="nn">numpy</span>
<div class="viewcode-block" id="OracleHook"><a class="viewcode-back" href="../../../code.html#airflow.hooks.oracle_hook.OracleHook">[docs]</a><span class="k">class</span> <span class="nc">OracleHook</span><span class="p">(</span><span class="n">DbApiHook</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Interact with Oracle SQL.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">conn_name_attr</span> <span class="o">=</span> <span class="s1">&#39;oracle_conn_id&#39;</span>
<span class="n">default_conn_name</span> <span class="o">=</span> <span class="s1">&#39;oracle_default&#39;</span>
<span class="n">supports_autocommit</span> <span class="o">=</span> <span class="kc">False</span>
<div class="viewcode-block" id="OracleHook.get_conn"><a class="viewcode-back" href="../../../code.html#airflow.hooks.oracle_hook.OracleHook.get_conn">[docs]</a> <span class="k">def</span> <span class="nf">get_conn</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Returns a oracle connection object</span>
<span class="sd"> Optional parameters for using a custom DSN connection</span>
<span class="sd"> (instead of using a server alias from tnsnames.ora)</span>
<span class="sd"> The dsn (data source name) is the TNS entry</span>
<span class="sd"> (from the Oracle names server or tnsnames.ora file)</span>
<span class="sd"> or is a string like the one returned from makedsn().</span>
<span class="sd"> :param dsn: the host address for the Oracle server</span>
<span class="sd"> :param service_name: the db_unique_name of the database</span>
<span class="sd"> that you are connecting to (CONNECT_DATA part of TNS)</span>
<span class="sd"> You can set these parameters in the extra fields of your connection</span>
<span class="sd"> as in ``{ &quot;dsn&quot;:&quot;some.host.address&quot; , &quot;service_name&quot;:&quot;some.service.name&quot; }``</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">conn</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_connection</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">oracle_conn_id</span><span class="p">)</span>
<span class="n">dsn</span> <span class="o">=</span> <span class="n">conn</span><span class="o">.</span><span class="n">extra_dejson</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;dsn&#39;</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="n">sid</span> <span class="o">=</span> <span class="n">conn</span><span class="o">.</span><span class="n">extra_dejson</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;sid&#39;</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="n">mod</span> <span class="o">=</span> <span class="n">conn</span><span class="o">.</span><span class="n">extra_dejson</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;module&#39;</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="n">service_name</span> <span class="o">=</span> <span class="n">conn</span><span class="o">.</span><span class="n">extra_dejson</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;service_name&#39;</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="k">if</span> <span class="n">dsn</span> <span class="ow">and</span> <span class="n">sid</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">service_name</span><span class="p">:</span>
<span class="n">dsn</span> <span class="o">=</span> <span class="n">cx_Oracle</span><span class="o">.</span><span class="n">makedsn</span><span class="p">(</span><span class="n">dsn</span><span class="p">,</span> <span class="n">conn</span><span class="o">.</span><span class="n">port</span><span class="p">,</span> <span class="n">sid</span><span class="p">)</span>
<span class="n">conn</span> <span class="o">=</span> <span class="n">cx_Oracle</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="n">conn</span><span class="o">.</span><span class="n">login</span><span class="p">,</span> <span class="n">conn</span><span class="o">.</span><span class="n">password</span><span class="p">,</span> <span class="n">dsn</span><span class="o">=</span><span class="n">dsn</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">dsn</span> <span class="ow">and</span> <span class="n">service_name</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">sid</span><span class="p">:</span>
<span class="n">dsn</span> <span class="o">=</span> <span class="n">cx_Oracle</span><span class="o">.</span><span class="n">makedsn</span><span class="p">(</span><span class="n">dsn</span><span class="p">,</span> <span class="n">conn</span><span class="o">.</span><span class="n">port</span><span class="p">,</span> <span class="n">service_name</span><span class="o">=</span><span class="n">service_name</span><span class="p">)</span>
<span class="n">conn</span> <span class="o">=</span> <span class="n">cx_Oracle</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="n">conn</span><span class="o">.</span><span class="n">login</span><span class="p">,</span> <span class="n">conn</span><span class="o">.</span><span class="n">password</span><span class="p">,</span> <span class="n">dsn</span><span class="o">=</span><span class="n">dsn</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">conn</span> <span class="o">=</span> <span class="n">cx_Oracle</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="n">conn</span><span class="o">.</span><span class="n">login</span><span class="p">,</span> <span class="n">conn</span><span class="o">.</span><span class="n">password</span><span class="p">,</span> <span class="n">conn</span><span class="o">.</span><span class="n">host</span><span class="p">)</span>
<span class="k">if</span> <span class="n">mod</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">conn</span><span class="o">.</span><span class="n">module</span> <span class="o">=</span> <span class="n">mod</span>
<span class="k">return</span> <span class="n">conn</span></div>
<div class="viewcode-block" id="OracleHook.insert_rows"><a class="viewcode-back" href="../../../code.html#airflow.hooks.oracle_hook.OracleHook.insert_rows">[docs]</a> <span class="k">def</span> <span class="nf">insert_rows</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">table</span><span class="p">,</span> <span class="n">rows</span><span class="p">,</span> <span class="n">target_fields</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">commit_every</span><span class="o">=</span><span class="mi">1000</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> A generic way to insert a set of tuples into a table,</span>
<span class="sd"> the whole set of inserts is treated as one transaction</span>
<span class="sd"> Changes from standard DbApiHook implementation:</span>
<span class="sd"> - Oracle SQL queries in cx_Oracle can not be terminated with a semicolon (&#39;;&#39;)</span>
<span class="sd"> - Replace NaN values with NULL using numpy.nan_to_num (not using is_nan()</span>
<span class="sd"> because of input types error for strings)</span>
<span class="sd"> - Coerce datetime cells to Oracle DATETIME format during insert</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">if</span> <span class="n">target_fields</span><span class="p">:</span>
<span class="n">target_fields</span> <span class="o">=</span> <span class="s1">&#39;, &#39;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">target_fields</span><span class="p">)</span>
<span class="n">target_fields</span> <span class="o">=</span> <span class="s1">&#39;(</span><span class="si">{}</span><span class="s1">)&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">target_fields</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">target_fields</span> <span class="o">=</span> <span class="s1">&#39;&#39;</span>
<span class="n">conn</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_conn</span><span class="p">()</span>
<span class="n">cur</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="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">supports_autocommit</span><span class="p">:</span>
<span class="n">cur</span><span class="o">.</span><span class="n">execute</span><span class="p">(</span><span class="s1">&#39;SET autocommit = 0&#39;</span><span class="p">)</span>
<span class="n">conn</span><span class="o">.</span><span class="n">commit</span><span class="p">()</span>
<span class="n">i</span> <span class="o">=</span> <span class="mi">0</span>
<span class="k">for</span> <span class="n">row</span> <span class="ow">in</span> <span class="n">rows</span><span class="p">:</span>
<span class="n">i</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="n">lst</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">for</span> <span class="n">cell</span> <span class="ow">in</span> <span class="n">row</span><span class="p">:</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">cell</span><span class="p">,</span> <span class="n">basestring</span><span class="p">):</span>
<span class="n">lst</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="s2">&quot;&#39;&quot;</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="n">cell</span><span class="p">)</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="s2">&quot;&#39;&quot;</span><span class="p">,</span> <span class="s2">&quot;&#39;&#39;&quot;</span><span class="p">)</span> <span class="o">+</span> <span class="s2">&quot;&#39;&quot;</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">cell</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">lst</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="s1">&#39;NULL&#39;</span><span class="p">)</span>
<span class="k">elif</span> <span class="nb">type</span><span class="p">(</span><span class="n">cell</span><span class="p">)</span> <span class="o">==</span> <span class="nb">float</span> <span class="ow">and</span> \
<span class="n">numpy</span><span class="o">.</span><span class="n">isnan</span><span class="p">(</span><span class="n">cell</span><span class="p">):</span> <span class="c1"># coerce numpy NaN to NULL</span>
<span class="n">lst</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="s1">&#39;NULL&#39;</span><span class="p">)</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">cell</span><span class="p">,</span> <span class="n">numpy</span><span class="o">.</span><span class="n">datetime64</span><span class="p">):</span>
<span class="n">lst</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="s2">&quot;&#39;&quot;</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="n">cell</span><span class="p">)</span> <span class="o">+</span> <span class="s2">&quot;&#39;&quot;</span><span class="p">)</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">cell</span><span class="p">,</span> <span class="n">datetime</span><span class="p">):</span>
<span class="n">lst</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="s2">&quot;to_date(&#39;&quot;</span> <span class="o">+</span>
<span class="n">cell</span><span class="o">.</span><span class="n">strftime</span><span class="p">(</span><span class="s1">&#39;%Y-%m-</span><span class="si">%d</span><span class="s1"> %H:%M:%S&#39;</span><span class="p">)</span> <span class="o">+</span>
<span class="s2">&quot;&#39;,&#39;YYYY-MM-DD HH24:MI:SS&#39;)&quot;</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">lst</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">cell</span><span class="p">))</span>
<span class="n">values</span> <span class="o">=</span> <span class="nb">tuple</span><span class="p">(</span><span class="n">lst</span><span class="p">)</span>
<span class="n">sql</span> <span class="o">=</span> <span class="s1">&#39;INSERT /*+ APPEND */ &#39;</span> \
<span class="s1">&#39;INTO </span><span class="si">{0}</span><span class="s1"> </span><span class="si">{1}</span><span class="s1"> VALUES (</span><span class="si">{2}</span><span class="s1">)&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">table</span><span class="p">,</span>
<span class="n">target_fields</span><span class="p">,</span>
<span class="s1">&#39;,&#39;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">values</span><span class="p">))</span>
<span class="n">cur</span><span class="o">.</span><span class="n">execute</span><span class="p">(</span><span class="n">sql</span><span class="p">)</span>
<span class="k">if</span> <span class="n">i</span> <span class="o">%</span> <span class="n">commit_every</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
<span class="n">conn</span><span class="o">.</span><span class="n">commit</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="s1">&#39;Loaded </span><span class="si">{i}</span><span class="s1"> into </span><span class="si">{table}</span><span class="s1"> rows so far&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="o">**</span><span class="nb">locals</span><span class="p">()))</span>
<span class="n">conn</span><span class="o">.</span><span class="n">commit</span><span class="p">()</span>
<span class="n">cur</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="s1">&#39;Done loading. Loaded a total of </span><span class="si">{i}</span><span class="s1"> rows&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="o">**</span><span class="nb">locals</span><span class="p">()))</span></div>
<div class="viewcode-block" id="OracleHook.bulk_insert_rows"><a class="viewcode-back" href="../../../code.html#airflow.hooks.oracle_hook.OracleHook.bulk_insert_rows">[docs]</a> <span class="k">def</span> <span class="nf">bulk_insert_rows</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">table</span><span class="p">,</span> <span class="n">rows</span><span class="p">,</span> <span class="n">target_fields</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">commit_every</span><span class="o">=</span><span class="mi">5000</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> A performant bulk insert for cx_Oracle</span>
<span class="sd"> that uses prepared statements via `executemany()`.</span>
<span class="sd"> For best performance, pass in `rows` as an iterator.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">conn</span> <span class="o">=</span> <span class="bp">self</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">values</span> <span class="o">=</span> <span class="s1">&#39;, &#39;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="s1">&#39;:</span><span class="si">%s</span><span class="s1">&#39;</span> <span class="o">%</span> <span class="n">i</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="nb">len</span><span class="p">(</span><span class="n">target_fields</span><span class="p">)</span> <span class="o">+</span> <span class="mi">1</span><span class="p">))</span>
<span class="n">prepared_stm</span> <span class="o">=</span> <span class="s1">&#39;insert into </span><span class="si">{tablename}</span><span class="s1"> (</span><span class="si">{columns}</span><span class="s1">) values (</span><span class="si">{values}</span><span class="s1">)&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span>
<span class="n">tablename</span><span class="o">=</span><span class="n">table</span><span class="p">,</span>
<span class="n">columns</span><span class="o">=</span><span class="s1">&#39;, &#39;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">target_fields</span><span class="p">),</span>
<span class="n">values</span><span class="o">=</span><span class="n">values</span><span class="p">,</span>
<span class="p">)</span>
<span class="n">row_count</span> <span class="o">=</span> <span class="mi">0</span>
<span class="c1"># Chunk the rows</span>
<span class="n">row_chunk</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">for</span> <span class="n">row</span> <span class="ow">in</span> <span class="n">rows</span><span class="p">:</span>
<span class="n">row_chunk</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">row</span><span class="p">)</span>
<span class="n">row_count</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="k">if</span> <span class="n">row_count</span> <span class="o">%</span> <span class="n">commit_every</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
<span class="n">cursor</span><span class="o">.</span><span class="n">prepare</span><span class="p">(</span><span class="n">prepared_stm</span><span class="p">)</span>
<span class="n">cursor</span><span class="o">.</span><span class="n">executemany</span><span class="p">(</span><span class="kc">None</span><span class="p">,</span> <span class="n">row_chunk</span><span class="p">)</span>
<span class="n">conn</span><span class="o">.</span><span class="n">commit</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="s1">&#39;[</span><span class="si">%s</span><span class="s1">] inserted </span><span class="si">%s</span><span class="s1"> rows&#39;</span><span class="p">,</span> <span class="n">table</span><span class="p">,</span> <span class="n">row_count</span><span class="p">)</span>
<span class="c1"># Empty chunk</span>
<span class="n">row_chunk</span> <span class="o">=</span> <span class="p">[]</span>
<span class="c1"># Commit the leftover chunk</span>
<span class="n">cursor</span><span class="o">.</span><span class="n">prepare</span><span class="p">(</span><span class="n">prepared_stm</span><span class="p">)</span>
<span class="n">cursor</span><span class="o">.</span><span class="n">executemany</span><span class="p">(</span><span class="kc">None</span><span class="p">,</span> <span class="n">row_chunk</span><span class="p">)</span>
<span class="n">conn</span><span class="o">.</span><span class="n">commit</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="s1">&#39;[</span><span class="si">%s</span><span class="s1">] inserted </span><span class="si">%s</span><span class="s1"> rows&#39;</span><span class="p">,</span> <span class="n">table</span><span class="p">,</span> <span class="n">row_count</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></div></div>
</pre></div>
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