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Tortoise ORM 0.23.0 Documentation
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Transactions
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<h1 id="transactions"><span id="id1"></span>Transactions<a class="headerlink" href="#transactions" title="Permalink to this heading">¶</a></h1>
<p>Tortoise ORM provides a simple way to manage transactions. You can use the
<code class="docutils literal notranslate"><span class="pre">atomic()</span></code> decorator or <code class="docutils literal notranslate"><span class="pre">in_transaction()</span></code> context manager.</p>
<p><code class="docutils literal notranslate"><span class="pre">atomic()</span></code> and <code class="docutils literal notranslate"><span class="pre">in_transaction()</span></code> can be nested. The inner blocks will create transaction savepoints,
and if an exception is raised and then caught outside of a nested block, the transaction will be rolled back
to the state before the block was entered. The outermost block will be the one that actually commits the transaction.
The savepoints are supported for Postgres, MySQL, MSSQL and SQLite. For other databases, it is advised to
propagate the exception to the outermost block to ensure that the transaction is rolled back.</p>
<blockquote>
<div><div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><code><span class="c1"># this block will commit changes on exit</span>
<span class="k">async</span> <span class="k">with</span> <span class="n">in_transaction</span><span class="p">():</span>
<span class="k">await</span> <span class="n">MyModel</span><span class="o">.</span><span class="n">create</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s1">'foo'</span><span class="p">)</span>
<span class="k">try</span><span class="p">:</span>
<span class="c1"># this block will create a savepoint and rollback to it if an exception is raised</span>
<span class="k">async</span> <span class="k">with</span> <span class="n">in_transaction</span><span class="p">():</span>
<span class="k">await</span> <span class="n">MyModel</span><span class="o">.</span><span class="n">create</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s1">'bar'</span><span class="p">)</span>
<span class="c1"># this will rollback to the savepoint, meaning that</span>
<span class="c1"># the 'bar' record will not be created, however,</span>
<span class="c1"># the 'foo' record will be created</span>
<span class="k">raise</span> <span class="ne">Exception</span><span class="p">()</span>
<span class="k">except</span> <span class="ne">Exception</span><span class="p">:</span>
<span class="k">pass</span>
</code></pre></div>
</div>
</div></blockquote>
<p>When using <code class="docutils literal notranslate"><span class="pre">asyncio.gather</span></code> or similar ways to spin up concurrent tasks in a transaction block,
avoid having nested transaction blocks in the concurrent tasks. Transactions are stateful and nested
blocks are expected to run sequentially, not concurrently.</p>
<span class="target" id="module-tortoise.transactions"></span><dl class="py function objdesc">
<dt class="sig sig-object highlight py" id="tortoise.transactions.atomic">
<span class="sig-prename descclassname"><span class="pre">tortoise.transactions.</span></span><span class="sig-name descname"><span class="pre">atomic</span></span><span class="sig-paren">(</span><span class="sig-param-decl"><em class="sig-param"><a class="n reference internal" href="#tortoise.transactions.atomic.connection_name" title="tortoise.transactions.atomic.connection_name (Python parameter) — name of connection to run with, optional if you have only one db connection"><span class="n"><span class="pre">connection_name</span></span></a><span class="o"><span class="pre">=</span></span><code class="code python default_value docutils literal highlight highlight-python"><span class="kc">None</span></code></em></span><span class="sig-paren">)</span><a class="reference internal" href="_modules/tortoise/transactions.html#atomic"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#tortoise.transactions.atomic" title="Permalink to this definition">¶</a></dt>
<dd><p>Transaction decorator.</p>
<p>You can wrap your function with this decorator to run it into one transaction.
If error occurs transaction will rollback.</p>
<dl class="field-list simple">
<dt class="field-odd" id="tortoise.transactions.atomic-parameters">Parameters<span class="colon">:</span><a class="headerlink" href="#tortoise.transactions.atomic-parameters" title="Permalink to this headline">¶</a></dt>
<dd class="field-odd"><dl class="simple api-field highlight">
<dt id="tortoise.transactions.atomic.connection_name"><span class="n sig-name">connection_name</span><span class="o">=</span><code class="code python default_value docutils literal highlight highlight-python"><span class="kc">None</span></code><a class="headerlink" href="#tortoise.transactions.atomic.connection_name" title="Permalink to this definition">¶</a></dt><dd><p>name of connection to run with, optional if you have only
one db connection</p>
</dd>
</dl>
</dd>
<dt class="field-even" id="tortoise.transactions.atomic-return-type">Return type<span class="colon">:</span><a class="headerlink" href="#tortoise.transactions.atomic-return-type" title="Permalink to this headline">¶</a></dt>
<dd class="field-even"><p><code class="xref py py-data docutils literal notranslate"><span class="pre">Callable</span></code>[[<code class="xref py py-data docutils literal notranslate"><span class="pre">Callable</span></code>[…, ~T]], <code class="xref py py-data docutils literal notranslate"><span class="pre">Callable</span></code>[…, ~T]]</p>
</dd>
</dl>
</dd></dl>
<dl class="py function objdesc">
<dt class="sig sig-object highlight py" id="tortoise.transactions.in_transaction">