/span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator"> -&gt; </span><a href="../-query-executor/-transactional/transaction.html">T</a></span></span><span class="token punctuation">)</span><span class="token operator">: </span><a href="../-query-executor/-transactional/transaction.html">T</a></div><div class="brief "><p class="paragraph">Begins (with default isolation level) a transactional operation and executes the provided block of code within t