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Lu, Huayi e6fa411af0 DWS DEV 830.201 version 
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com>
Co-authored-by: Lu, Huayi <luhuayi@huawei.com>
Co-committed-by: Lu, Huayi <luhuayi@huawei.com>
2024-05-16 07:24:04 +00:00

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<a name="EN-US_TOPIC_0000001233628581"></a><a name="EN-US_TOPIC_0000001233628581"></a>
<h1 class="topictitle1">Trigger Functions</h1>
<div id="body1551942823551"><div class="section" id="EN-US_TOPIC_0000001233628581__section162781584532"><h4 class="sectiontitle">pg_get_triggerdef(oid)</h4><p id="EN-US_TOPIC_0000001233628581__p0438111585311">Description: Obtains the definition information of a trigger.</p>
<p id="EN-US_TOPIC_0000001233628581__p1443818150531">Parameter: OID of the trigger to be queried</p>
<p id="EN-US_TOPIC_0000001233628581__p0310421185316">Return type: text</p>
<p id="EN-US_TOPIC_0000001233628581__p6310821175312">Example:</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233628581__screen15310152120531"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
<span class="normal">2</span>
<span class="normal">3</span>
<span class="normal">4</span>
<span class="normal">5</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="n">pg_get_triggerdef</span><span class="p">(</span><span class="n">oid</span><span class="p">)</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">pg_trigger</span><span class="p">;</span>
<span class="w"> </span><span class="n">pg_get_triggerdef</span>
<span class="c1">----------------------------------------------------------------------------------------------------------------------</span>
<span class="w"> </span><span class="k">CREATE</span><span class="w"> </span><span class="k">TRIGGER</span><span class="w"> </span><span class="n">insert_trigger</span><span class="w"> </span><span class="k">BEFORE</span><span class="w"> </span><span class="k">INSERT</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="n">test_trigger_src_tbl</span><span class="w"> </span><span class="k">FOR</span><span class="w"> </span><span class="k">EACH</span><span class="w"> </span><span class="k">ROW</span><span class="w"> </span><span class="k">EXECUTE</span><span class="w"> </span><span class="k">PROCEDURE</span><span class="w"> </span><span class="n">tri_insert_func</span><span class="p">()</span>
<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span>
</pre></div></td></tr></table></div>
</div>
</div>
<div class="section" id="EN-US_TOPIC_0000001233628581__section10505104795315"><h4 class="sectiontitle">pg_get_triggerdef(oid, boolean)</h4><p id="EN-US_TOPIC_0000001233628581__p1150564716536">Description: Obtains the definition information of a trigger.</p>
<p id="EN-US_TOPIC_0000001233628581__p1505184719537">Parameter: OID of the trigger to be queried and whether it is displayed in pretty mode</p>
<p id="EN-US_TOPIC_0000001233628581__p150574717538">Return type: text</p>
<div class="note" id="EN-US_TOPIC_0000001233628581__note23125537535"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="EN-US_TOPIC_0000001233628581__p03121653115315">The Boolean parameters take effect only when the WHEN condition is specified during trigger creation.</p>
</div></div>
<p id="EN-US_TOPIC_0000001233628581__p587619166549">Example:</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001233628581__screen49773415548"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
<span class="normal"> 2</span>
<span class="normal"> 3</span>
<span class="normal"> 4</span>
<span class="normal"> 5</span>
<span class="normal"> 6</span>
<span class="normal"> 7</span>
<span class="normal"> 8</span>
<span class="normal"> 9</span>
<span class="normal">10</span>
<span class="normal">11</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="n">pg_get_triggerdef</span><span class="p">(</span><span class="n">oid</span><span class="p">,</span><span class="k">true</span><span class="p">)</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">pg_trigger</span><span class="p">;</span>
<span class="w"> </span><span class="n">pg_get_triggerdef</span>
<span class="c1">----------------------------------------------------------------------------------------------------------------------</span>
<span class="w"> </span><span class="k">CREATE</span><span class="w"> </span><span class="k">TRIGGER</span><span class="w"> </span><span class="n">insert_trigger</span><span class="w"> </span><span class="k">BEFORE</span><span class="w"> </span><span class="k">INSERT</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="n">test_trigger_src_tbl</span><span class="w"> </span><span class="k">FOR</span><span class="w"> </span><span class="k">EACH</span><span class="w"> </span><span class="k">ROW</span><span class="w"> </span><span class="k">EXECUTE</span><span class="w"> </span><span class="k">PROCEDURE</span><span class="w"> </span><span class="n">tri_insert_func</span><span class="p">()</span>
<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span>
<span class="k">SELECT</span><span class="w"> </span><span class="n">pg_get_triggerdef</span><span class="p">(</span><span class="n">oid</span><span class="p">,</span><span class="k">false</span><span class="p">)</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">pg_trigger</span><span class="p">;</span>
<span class="w"> </span><span class="n">pg_get_triggerdef</span>
<span class="c1">----------------------------------------------------------------------------------------------------------------------</span>
<span class="w"> </span><span class="k">CREATE</span><span class="w"> </span><span class="k">TRIGGER</span><span class="w"> </span><span class="n">insert_trigger</span><span class="w"> </span><span class="k">BEFORE</span><span class="w"> </span><span class="k">INSERT</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="n">test_trigger_src_tbl</span><span class="w"> </span><span class="k">FOR</span><span class="w"> </span><span class="k">EACH</span><span class="w"> </span><span class="k">ROW</span><span class="w"> </span><span class="k">EXECUTE</span><span class="w"> </span><span class="k">PROCEDURE</span><span class="w"> </span><span class="n">tri_insert_func</span><span class="p">()</span>
<span class="p">(</span><span class="mi">1</span><span class="w"> </span><span class="k">row</span><span class="p">)</span>
</pre></div></td></tr></table></div>
</div>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_06_0027.html">Functions and Operators</a></div>
</div>
</div>
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