Laravel-Singleton-Klasse, die mehrere verschiedene Datenbanken verbindet

Wenn Sie eine Verbindung zu mehreren verschiedenen Datenbanken herstellen, müssen Sie mehrere Verbindungen schreiben, um den Vorgang zu vereinfachen. Solange verschiedene Datenbanken entsprechende Klassen einrichten und diese Klasse erben, können Sie das ORM-Modell verwenden zu betreiben.

<code class="sourceCode php"><span class="kw">class</span> singletonInstance 
{

    <span class="kw">protected</span> <span class="kw">static</span> <span class="kw">$instances</span> = <span class="ot">[];</span>
    <span class="kw">protected</span> <span class="kw">static</span> <span class="kw">$table</span> = <span class="kw">null</span><span class="ot">;</span>
    <span class="kw">protected</span> <span class="kw">static</span> <span class="kw">$connection</span> = <span class="kw">null</span><span class="ot">;</span>

    <span class="kw">public</span> <span class="kw">function</span> <span class="fu">__construct</span><span class="ot">()</span>
    {
        <span class="kw">if</span><span class="ot">(</span>!<span class="fu">isset</span><span class="ot">(</span><span class="kw">static</span>::<span class="kw">$instances</span><span class="ot">[</span><span class="kw">static</span>::<span class="kw">class</span><span class="ot">]))</span>{
            <span class="kw">if</span><span class="ot">(</span><span class="fu">is_null</span><span class="ot">(</span><span class="kw">self</span>::<span class="kw">$table</span><span class="ot">)</span> || <span class="fu">is_null</span><span class="ot">(</span><span class="kw">self</span>::<span class="kw">$connection</span><span class="ot">))</span>
            {
                <span class="kw">throw</span> <span class="kw">new</span> \<span class="kw">Exception</span><span class="ot">(</span><span class="st">'not defined property'</span><span class="ot">);</span>
            }
            <span class="kw">static</span>::<span class="kw">$instances</span><span class="ot">[</span><span class="kw">static</span>::<span class="kw">class</span><span class="ot">]</span> = <span class="kw">DB</span>::connection<span class="ot">(</span><span class="kw">self</span>::connection<span class="ot">)</span>->table<span class="ot">(</span><span class="kw">self</span>::<span class="kw">$table</span><span class="ot">);</span>
        }
    }

    <span class="kw">public</span> <span class="kw">static</span> <span class="kw">function</span> getDB<span class="ot">()</span>
    {
        <span class="kw">return</span> <span class="kw">static</span>::<span class="kw">$instances</span><span class="ot">[</span><span class="kw">static</span>::<span class="kw">class</span><span class="ot">];</span>
    }

}</code>

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