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<!doctype html>
<html lang="en" class="no-js">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<link rel="icon" href="_static/tortoise.png">
<title>Router - Tortoise ORM v0.21.7 Documentation</title>
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Tortoise ORM 0.21.7 Documentation
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Router
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<h1 id="router"><span id="id1"></span>Router<a class="headerlink" href="#router" title="Permalink to this heading">¶</a></h1>
<p>The easiest way to use multiple databases is to set up a database routing scheme. The default routing scheme ensures that objects remain ‘sticky’ to their original database (i.e., an object retrieved from the foo database will be saved on the same database). The default routing scheme ensures that if a database isn’t specified, all queries fall back to the default database.</p>
<h2 id="usage">Usage<a class="headerlink" href="#usage" title="Permalink to this heading">¶</a></h2>
<h3 id="define-router">Define Router<a class="headerlink" href="#define-router" title="Permalink to this heading">¶</a></h3>
<p>Define a router is simple, you need just write a class that has <cite>db_for_read</cite> and <cite>db_for_write</cite> methods.</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><code><span class="k">class</span> <span class="nc">Router</span><span class="p">:</span>
<span class="k">def</span> <span class="nf">db_for_read</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">model</span><span class="p">:</span> <span class="n">Type</span><span class="p">[</span><span class="n">Model</span><span class="p">]):</span>
<span class="k">return</span> <span class="s2">"slave"</span>
<span class="k">def</span> <span class="nf">db_for_write</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">model</span><span class="p">:</span> <span class="n">Type</span><span class="p">[</span><span class="n">Model</span><span class="p">]):</span>
<span class="k">return</span> <span class="s2">"master"</span>
</code></pre></div>
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<p>The two methods return a connection string defined in configuration.</p>
<h3 id="config-router">Config Router<a class="headerlink" href="#config-router" title="Permalink to this heading">¶</a></h3>
<p>Just put it in configuration of tortoise or in <cite>Tortoise.init</cite> method.</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><code><span class="n">config</span> <span class="o">=</span> <span class="p">{</span>
<span class="s2">"connections"</span><span class="p">:</span> <span class="p">{</span><span class="s2">"master"</span><span class="p">:</span> <span class="s2">"sqlite:///tmp/test.db"</span><span class="p">,</span> <span class="s2">"slave"</span><span class="p">:</span> <span class="s2">"sqlite:///tmp/test.db"</span><span class="p">},</span>
<span class="s2">"apps"</span><span class="p">:</span> <span class="p">{</span>
<span class="s2">"models"</span><span class="p">:</span> <span class="p">{</span>
<span class="s2">"models"</span><span class="p">:</span> <span class="p">[</span><span class="s2">"__main__"</span><span class="p">],</span>
<span class="s2">"default_connection"</span><span class="p">:</span> <span class="s2">"master"</span><span class="p">,</span>
<span class="p">}</span>
<span class="p">},</span>
<span class="s2">"routers"</span><span class="p">:</span> <span class="p">[</span><span class="s2">"path.Router"</span><span class="p">],</span>
<span class="s2">"use_tz"</span><span class="p">:</span> <span class="kc">False</span><span class="p">,</span>
<span class="s2">"timezone"</span><span class="p">:</span> <span class="s2">"UTC"</span><span class="p">,</span>
<span class="p">}</span>
<span class="k">await</span> <span class="n">Tortoise</span><span class="o">.</span><span class="n">init</span><span class="p">(</span><span class="n">config</span><span class="o">=</span><span class="n">config</span><span class="p">)</span>
<span class="c1"># or</span>
<span class="n">routers</span> <span class="o">=</span> <span class="n">config</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="s1">'routers'</span><span class="p">)</span>
<span class="k">await</span> <span class="n">Tortoise</span><span class="o">.</span><span class="n">init</span><span class="p">(</span><span class="n">config</span><span class="o">=</span><span class="n">config</span><span class="p">,</span> <span class="n">routers</span><span class="o">=</span><span class="n">routers</span><span class="p">)</span>
</code></pre></div>
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<p>After that, all <cite>select</cite> operations will use <cite>slave</cite> connection, all <cite>create/update/delete</cite> operations will use <cite>master</cite> connection.</p>
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