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<a href="https://github.com/vapor/documentation/edit/master/3.0/docs/fluent/transaction.md" title="Edit this page" class="md-icon md-content__icon">&#xE3C9;</a>
<h1 id="fluent-transactions">Fluent Transactions<a class="headerlink" href="#fluent-transactions" title="Permanent link">&para;</a></h1>
<p>Transactions allow you to ensure multiple operations complete succesfully before saving data to your database. Once a transaction is started, you may run Fluent queries normally. However, no data will be saved to the database until the transaction completes. If an error is thrown at any point during the transaction (by you or the database), none of the changes will take effect.</p>
<p>To perform a transaction, you need access to something that can connect to the database. This is usually an incoming HTTP request. Use the <a href="https://api.vapor.codes/fluent/latest/Fluent/Extensions/DatabaseConnectable.html#/s:11DatabaseKit0A11ConnectableP6FluentE11transaction2on_3NIO15EventLoopFutureCyqd_0_GAA0A10IdentifierVyqd__G_AJ10ConnectionQyd__KctAD21TransactionSupportingRd__r0_lF"><code>transaction(on:_:)</code></a> method.</p>
<p>Fill in the Xcode placeholders below with your database's name from <a href="getting-started/#choosing-a-driver">Getting Started &rarr; Choosing a Driver</a>.</p>
<div class="codehilite"><pre><span></span><span class="n">req</span><span class="p">.</span><span class="n">transaction</span><span class="p">(</span><span class="n">on</span><span class="p">:</span> <span class="p">.</span><span class="o">&lt;</span><span class="p">#</span><span class="n">dbid</span><span class="p">#</span><span class="o">&gt;</span><span class="p">)</span> <span class="p">{</span> <span class="n">conn</span> <span class="k">in</span>
<span class="c1">// use conn as your connection</span>
<span class="p">}</span>
</pre></div>
<p>Once inside the transaction closure, you must use the supplied connection (named <code>conn</code> in the example) to perform queries. </p>
<p>The closure expects a generic future return value. Once this future completes succesfully, the transaction will be committed. </p>
<div class="codehilite"><pre><span></span><span class="kd">var</span> <span class="nv">userA</span><span class="p">:</span> <span class="n">User</span> <span class="p">=</span> <span class="p">...</span>
<span class="kd">var</span> <span class="nv">userB</span><span class="p">:</span> <span class="n">User</span> <span class="p">=</span> <span class="p">...</span>
<span class="k">return</span> <span class="n">req</span><span class="p">.</span><span class="n">transaction</span><span class="p">(</span><span class="n">on</span><span class="p">:</span> <span class="p">.</span><span class="o">&lt;</span><span class="p">#</span><span class="n">dbid</span><span class="p">#</span><span class="o">&gt;</span><span class="p">)</span> <span class="p">{</span> <span class="n">conn</span> <span class="k">in</span>
<span class="k">return</span> <span class="n">userA</span><span class="p">.</span><span class="n">save</span><span class="p">(</span><span class="n">on</span><span class="p">:</span> <span class="n">conn</span><span class="p">).</span><span class="n">flatMap</span> <span class="p">{</span> <span class="kc">_</span> <span class="k">in</span>
<span class="k">return</span> <span class="n">userB</span><span class="p">.</span><span class="n">save</span><span class="p">(</span><span class="n">on</span><span class="p">:</span> <span class="n">conn</span><span class="p">)</span>
<span class="p">}.</span><span class="n">transform</span><span class="p">(</span><span class="n">to</span><span class="p">:</span> <span class="n">HTTPStatus</span><span class="p">.</span><span class="n">ok</span><span class="p">)</span>
<span class="p">}</span>
</pre></div>
<p>The above example will save User A <em>then</em> User B before completing the transaction. If either user fails to save, neither will save. Once the transaction has completed, the result is transformed to a simple HTTP status response indicating completion.</p>
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