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| <div class="section" id="module-apache_beam.io.jdbc"> |
| <span id="apache-beam-io-jdbc-module"></span><h1>apache_beam.io.jdbc module<a class="headerlink" href="#module-apache_beam.io.jdbc" title="Permalink to this headline">¶</a></h1> |
| <p>PTransforms for supporting Jdbc in Python pipelines.</p> |
| <p>These transforms are currently supported by Beam portable |
| Flink, Spark, and Dataflow v2 runners.</p> |
| <p><strong>Setup</strong></p> |
| <p>Transforms provided in this module are cross-language transforms |
| implemented in the Beam Java SDK. During the pipeline construction, Python SDK |
| will connect to a Java expansion service to expand these transforms. |
| To facilitate this, a small amount of setup is needed before using these |
| transforms in a Beam Python pipeline.</p> |
| <p>There are several ways to setup cross-language Jdbc transforms.</p> |
| <ul class="simple"> |
| <li>Option 1: use the default expansion service</li> |
| <li>Option 2: specify a custom expansion service</li> |
| </ul> |
| <p>See below for details regarding each of these options.</p> |
| <p><em>Option 1: Use the default expansion service</em></p> |
| <p>This is the recommended and easiest setup option for using Python Jdbc |
| transforms. This option is only available for Beam 2.24.0 and later.</p> |
| <p>This option requires following pre-requisites before running the Beam |
| pipeline.</p> |
| <ul class="simple"> |
| <li>Install Java runtime in the computer from where the pipeline is constructed |
| and make sure that ‘java’ command is available.</li> |
| </ul> |
| <p>In this option, Python SDK will either download (for released Beam version) or |
| build (when running from a Beam Git clone) a expansion service jar and use |
| that to expand transforms. Currently Jdbc transforms use the |
| ‘beam-sdks-java-io-expansion-service’ jar for this purpose.</p> |
| <p>The transforms in this file support an extra <cite>classpath</cite> argument, where one |
| can specify any extra JARs to be included in the classpath for the expansion |
| service. Users will need to specify this option to include the JDBC driver |
| for the database that you’re trying to use. <strong>By default, a Postgres JDBC |
| driver</strong> is included (i.e. the Java package |
| <cite>“org.postgresql:postgresql:42.2.16”</cite>).</p> |
| <p><em>Option 2: specify a custom expansion service</em></p> |
| <p>In this option, you startup your own expansion service and provide that as |
| a parameter when using the transforms provided in this module.</p> |
| <p>This option requires following pre-requisites before running the Beam |
| pipeline.</p> |
| <ul class="simple"> |
| <li>Startup your own expansion service.</li> |
| <li>Update your pipeline to provide the expansion service address when |
| initiating Jdbc transforms provided in this module.</li> |
| </ul> |
| <p>Flink Users can use the built-in Expansion Service of the Flink Runner’s |
| Job Server. If you start Flink’s Job Server, the expansion service will be |
| started on port 8097. For a different address, please set the |
| expansion_service parameter.</p> |
| <p><strong>More information</strong></p> |
| <p>For more information regarding cross-language transforms see: |
| - <a class="reference external" href="https://beam.apache.org/roadmap/portability/">https://beam.apache.org/roadmap/portability/</a></p> |
| <p>For more information specific to Flink runner see: |
| - <a class="reference external" href="https://beam.apache.org/documentation/runners/flink/">https://beam.apache.org/documentation/runners/flink/</a></p> |
| <dl class="class"> |
| <dt id="apache_beam.io.jdbc.WriteToJdbc"> |
| <em class="property">class </em><code class="descclassname">apache_beam.io.jdbc.</code><code class="descname">WriteToJdbc</code><span class="sig-paren">(</span><em>table_name</em>, <em>driver_class_name</em>, <em>jdbc_url</em>, <em>username</em>, <em>password</em>, <em>statement=None</em>, <em>connection_properties=None</em>, <em>connection_init_sqls=None</em>, <em>expansion_service=None</em>, <em>classpath=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/jdbc.html#WriteToJdbc"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.jdbc.WriteToJdbc" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference internal" href="apache_beam.transforms.external.html#apache_beam.transforms.external.ExternalTransform" title="apache_beam.transforms.external.ExternalTransform"><code class="xref py py-class docutils literal notranslate"><span class="pre">apache_beam.transforms.external.ExternalTransform</span></code></a></p> |
| <p>A PTransform which writes Rows to the specified database via JDBC.</p> |
| <p>This transform receives Rows defined as NamedTuple type and registered in |
| the coders registry, e.g.:</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">ExampleRow</span> <span class="o">=</span> <span class="n">typing</span><span class="o">.</span><span class="n">NamedTuple</span><span class="p">(</span><span class="s1">'ExampleRow'</span><span class="p">,</span> |
| <span class="p">[(</span><span class="s1">'id'</span><span class="p">,</span> <span class="nb">int</span><span class="p">),</span> <span class="p">(</span><span class="s1">'name'</span><span class="p">,</span> <span class="n">unicode</span><span class="p">)])</span> |
| <span class="n">coders</span><span class="o">.</span><span class="n">registry</span><span class="o">.</span><span class="n">register_coder</span><span class="p">(</span><span class="n">ExampleRow</span><span class="p">,</span> <span class="n">coders</span><span class="o">.</span><span class="n">RowCoder</span><span class="p">)</span> |
| |
| <span class="k">with</span> <span class="n">TestPipeline</span><span class="p">()</span> <span class="k">as</span> <span class="n">p</span><span class="p">:</span> |
| <span class="n">_</span> <span class="o">=</span> <span class="p">(</span> |
| <span class="n">p</span> |
| <span class="o">|</span> <span class="n">beam</span><span class="o">.</span><span class="n">Create</span><span class="p">([</span><span class="n">ExampleRow</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="s1">'abc'</span><span class="p">)])</span> |
| <span class="o">.</span><span class="n">with_output_types</span><span class="p">(</span><span class="n">ExampleRow</span><span class="p">)</span> |
| <span class="o">|</span> <span class="s1">'Write to jdbc'</span> <span class="o">>></span> <span class="n">WriteToJdbc</span><span class="p">(</span> |
| <span class="n">table_name</span><span class="o">=</span><span class="s1">'jdbc_external_test_write'</span> |
| <span class="n">driver_class_name</span><span class="o">=</span><span class="s1">'org.postgresql.Driver'</span><span class="p">,</span> |
| <span class="n">jdbc_url</span><span class="o">=</span><span class="s1">'jdbc:postgresql://localhost:5432/example'</span><span class="p">,</span> |
| <span class="n">username</span><span class="o">=</span><span class="s1">'postgres'</span><span class="p">,</span> |
| <span class="n">password</span><span class="o">=</span><span class="s1">'postgres'</span><span class="p">,</span> |
| <span class="p">))</span> |
| </pre></div> |
| </div> |
| <p>table_name is a required paramater, and by default, the write_statement is |
| generated from it.</p> |
| <p>The generated write_statement can be overridden by passing in a |
| write_statment.</p> |
| <p>Experimental; no backwards compatibility guarantees.</p> |
| <p>Initializes a write operation to Jdbc.</p> |
| <table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple"> |
| <li><strong>driver_class_name</strong> – name of the jdbc driver class</li> |
| <li><strong>jdbc_url</strong> – full jdbc url to the database.</li> |
| <li><strong>username</strong> – database username</li> |
| <li><strong>password</strong> – database password</li> |
| <li><strong>statement</strong> – sql statement to be executed</li> |
| <li><strong>connection_properties</strong> – properties of the jdbc connection |
| passed as string with format |
| [propertyName=property;]*</li> |
| <li><strong>connection_init_sqls</strong> – required only for MySql and MariaDB. |
| passed as list of strings</li> |
| <li><strong>expansion_service</strong> – The address (host:port) of the ExpansionService.</li> |
| <li><strong>classpath</strong> – A list of JARs or Java packages to include in the |
| classpath for the expansion service. This option is |
| usually needed for <cite>jdbc</cite> to include extra JDBC driver |
| packages. |
| The packages can be in these three formats: (1) A local |
| file, (2) A URL, (3) A gradle-style identifier of a Maven |
| package (e.g. “org.postgresql:postgresql:42.3.1”). |
| By default, this argument includes a Postgres SQL JDBC |
| driver.</li> |
| </ul> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <dl class="attribute"> |
| <dt id="apache_beam.io.jdbc.WriteToJdbc.URN"> |
| <code class="descname">URN</code><em class="property"> = 'beam:transform:org.apache.beam:schemaio_jdbc_write:v1'</em><a class="headerlink" href="#apache_beam.io.jdbc.WriteToJdbc.URN" title="Permalink to this definition">¶</a></dt> |
| <dd></dd></dl> |
| |
| </dd></dl> |
| |
| <dl class="class"> |
| <dt id="apache_beam.io.jdbc.ReadFromJdbc"> |
| <em class="property">class </em><code class="descclassname">apache_beam.io.jdbc.</code><code class="descname">ReadFromJdbc</code><span class="sig-paren">(</span><em>table_name</em>, <em>driver_class_name</em>, <em>jdbc_url</em>, <em>username</em>, <em>password</em>, <em>query=None</em>, <em>output_parallelization=None</em>, <em>fetch_size=None</em>, <em>connection_properties=None</em>, <em>connection_init_sqls=None</em>, <em>expansion_service=None</em>, <em>classpath=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/io/jdbc.html#ReadFromJdbc"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.io.jdbc.ReadFromJdbc" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference internal" href="apache_beam.transforms.external.html#apache_beam.transforms.external.ExternalTransform" title="apache_beam.transforms.external.ExternalTransform"><code class="xref py py-class docutils literal notranslate"><span class="pre">apache_beam.transforms.external.ExternalTransform</span></code></a></p> |
| <p>A PTransform which reads Rows from the specified database via JDBC.</p> |
| <p>This transform delivers Rows defined as NamedTuple registered in |
| the coders registry, e.g.:</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">ExampleRow</span> <span class="o">=</span> <span class="n">typing</span><span class="o">.</span><span class="n">NamedTuple</span><span class="p">(</span><span class="s1">'ExampleRow'</span><span class="p">,</span> |
| <span class="p">[(</span><span class="s1">'id'</span><span class="p">,</span> <span class="nb">int</span><span class="p">),</span> <span class="p">(</span><span class="s1">'name'</span><span class="p">,</span> <span class="n">unicode</span><span class="p">)])</span> |
| <span class="n">coders</span><span class="o">.</span><span class="n">registry</span><span class="o">.</span><span class="n">register_coder</span><span class="p">(</span><span class="n">ExampleRow</span><span class="p">,</span> <span class="n">coders</span><span class="o">.</span><span class="n">RowCoder</span><span class="p">)</span> |
| |
| <span class="k">with</span> <span class="n">TestPipeline</span><span class="p">()</span> <span class="k">as</span> <span class="n">p</span><span class="p">:</span> |
| <span class="n">result</span> <span class="o">=</span> <span class="p">(</span> |
| <span class="n">p</span> |
| <span class="o">|</span> <span class="s1">'Read from jdbc'</span> <span class="o">>></span> <span class="n">ReadFromJdbc</span><span class="p">(</span> |
| <span class="n">table_name</span><span class="o">=</span><span class="s1">'jdbc_external_test_read'</span> |
| <span class="n">driver_class_name</span><span class="o">=</span><span class="s1">'org.postgresql.Driver'</span><span class="p">,</span> |
| <span class="n">jdbc_url</span><span class="o">=</span><span class="s1">'jdbc:postgresql://localhost:5432/example'</span><span class="p">,</span> |
| <span class="n">username</span><span class="o">=</span><span class="s1">'postgres'</span><span class="p">,</span> |
| <span class="n">password</span><span class="o">=</span><span class="s1">'postgres'</span><span class="p">,</span> |
| <span class="p">))</span> |
| </pre></div> |
| </div> |
| <p>table_name is a required paramater, and by default, the read_query is |
| generated from it.</p> |
| <p>The generated read_query can be overridden by passing in a read_query.</p> |
| <p>Experimental; no backwards compatibility guarantees.</p> |
| <p>Initializes a read operation from Jdbc.</p> |
| <table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple"> |
| <li><strong>driver_class_name</strong> – name of the jdbc driver class</li> |
| <li><strong>jdbc_url</strong> – full jdbc url to the database.</li> |
| <li><strong>username</strong> – database username</li> |
| <li><strong>password</strong> – database password</li> |
| <li><strong>query</strong> – sql query to be executed</li> |
| <li><strong>output_parallelization</strong> – is output parallelization on</li> |
| <li><strong>fetch_size</strong> – how many rows to fetch</li> |
| <li><strong>connection_properties</strong> – properties of the jdbc connection |
| passed as string with format |
| [propertyName=property;]*</li> |
| <li><strong>connection_init_sqls</strong> – required only for MySql and MariaDB. |
| passed as list of strings</li> |
| <li><strong>expansion_service</strong> – The address (host:port) of the ExpansionService.</li> |
| <li><strong>classpath</strong> – A list of JARs or Java packages to include in the |
| classpath for the expansion service. This option is |
| usually needed for <cite>jdbc</cite> to include extra JDBC driver |
| packages. |
| The packages can be in these three formats: (1) A local |
| file, (2) A URL, (3) A gradle-style identifier of a Maven |
| package (e.g. “org.postgresql:postgresql:42.3.1”). |
| By default, this argument includes a Postgres SQL JDBC |
| driver.</li> |
| </ul> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <dl class="attribute"> |
| <dt id="apache_beam.io.jdbc.ReadFromJdbc.URN"> |
| <code class="descname">URN</code><em class="property"> = 'beam:transform:org.apache.beam:schemaio_jdbc_read:v1'</em><a class="headerlink" href="#apache_beam.io.jdbc.ReadFromJdbc.URN" title="Permalink to this definition">¶</a></dt> |
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