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<p style="margin: 10px 0 0 0">My use case is to enforce integrity. </p>
<p style="margin: 10px 0 0 0">Example e-commerce:</p>
<p style="margin: 10px 0 0 0">Products can optional be grouped by a variant group (drop down menu for variant filters). </p>
<p style="margin: 10px 0 0 0">Instead of using two tables such as Product and ProductVariantGroup a simple approach is to use a single table.</p>
<p style="margin: 10px 0 0 0"><b>Entity</b></p>
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<b>"Product.java"</b>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
Product
{
<span class="code-object" style="color: #910091">boolean</span> isVarGroup;
Product varGroup; <span class="code-comment" style="color: #808080">// varGroup.isVarGroup must be <span class="code-keyword" style="color: #000091; color: #808080">true</span>!
</span>}
</pre>
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<b>"XML-Mapping"</b>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<many-to-one name=<span class="code-quote" style="color: #009100">"varGroup"</span> class=<span class="code-quote" style="color: #009100">"Product"</span> lazy=<span class="code-quote" style="color: #009100">"<span class="code-keyword" style="color: #000091; color: #009100">false</span>"</span> fetch=<span class="code-quote" style="color: #009100">"select"</span> />
<property name=<span class="code-quote" style="color: #009100">"isVarGroup"</span>/>
</pre>
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<p style="margin: 10px 0 0 0"><b>Database</b></p>
<p style="margin: 10px 0 0 0">In case a product is also a variant group its reference must point to itself. If not it must point to a valid variant group.</p>
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<b>"Trigger"</b>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
        -- check isVarGroup
        IF (NEW.isVarGroup IS TRUE AND NEW.varGroup != NEW.id) THEN
                -- set to itself
                SET NEW.varGroup = NEW.id; -- SIGNAL SQLSTATE '23000' ...
        -- cannot reference itself <span class="code-keyword" style="color: #000091">if</span> not a variant group
        ELSEIF (NEW.varGroup = NEW.id) THEN
                SET NEW.varGroup = NULL; -- SIGNAL SQLSTATE '23000' ...
        END IF;
</pre>
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<p style="margin: 10px 0 0 0">There are maybe other use cases.</p>
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