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<meta name="doctitle" content="Editing Installation Script Files that Create Triggers" />
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<title>Editing Installation Script Files that Create Triggers</title>
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<p><a id="BABJCJIJ" name="BABJCJIJ"></a><a id="TDDDG74100" name="TDDDG74100"></a></p>
<div class="sect2">
<h1>Editing Installation Script Files that Create Triggers</h1>
<a name="BEGIN" id="BEGIN"></a>
<p>If your application has a <code>BEFORE</code> <code>INSERT</code> <a id="sthref717" name="sthref717"></a><a id="sthref718" name="sthref718"></a><a id="sthref719" name="sthref719"></a><a id="sthref720" name="sthref720"></a><a id="sthref721" name="sthref721"></a>trigger on a source table, and you <span class="italic">will</span> insert the data from that source table into the corresponding new table, then you must decide if you want the trigger to fire before each <code>INSERT</code> statement in the installation script file inserts data into the new table.</p>
<p>For example, in the sample application, <code>NEW_EVALUATION_TRIGGER</code> fires before a row is inserted into the <code>EVALUATIONS</code> table, and generates the unique number for the primary key of that row, using <code>EVALUATIONS_SEQ</code>. The trigger fires once for each row affected by the triggering <code>INSERT</code> statement. (<code>NEW_EVALUATION_TRIGGER</code> is created in <a href="tdddg_triggers005.htm#BABCGBBD">"Tutorial: Creating a Trigger that Generates a Primary Key for a Row Before It Is Inserted"</a>.)</p>
<p>The source <code>EVALUATIONS</code> table is populated with primary keys. If you do not want the installation script to put new primary key values in the new <code>EVALUATIONS</code> table, then you must edit the <code>CREATE</code> <code>TRIGGER</code> statement in the installation script file as shown in bold:</p>
<pre xml:space="preserve" class="oac_no_warn">
CREATE OR REPLACE
TRIGGER NEW_EVALUATION_TRIGGER
BEFORE INSERT ON EVALUATIONS
FOR EACH ROW
BEGIN
  <span class="bold">IF :NEW.evaluation_id IS NULL THEN</span>
    :NEW.evaluation_id := evaluations_seq.NEXTVAL
  <span class="bold">END IF;</span>
END;
</pre>
<p>Also, check the current value of the sequence. If it not is greater than the maximum value in the primary key column, make it greater.</p>
<p>You can edit the installation script file in the SQL&nbsp;Worksheet or any text editor.</p>
<p>Two alternatives to editing the installation script file are:</p>
<ul>
<li>
<p>Change the trigger definition in the source file and then re-create the installation script file.</p>
<p>For information about changing triggers, see <a href="tdddg_triggers008.htm#CHDBBCAJ">"Changing Triggers"</a>.</p>
</li>
<li>
<p>Disable the trigger before running the data installation script file, and then re-enable it afterward.</p>
<p>For information about disabling and enabling triggers, see <a href="tdddg_triggers009.htm#CHDHIADD">"Disabling and Enabling Triggers"</a>.</p>
</li>
</ul>
<p>If your application uses <a id="sthref722" name="sthref722"></a><a id="sthref723" name="sthref723"></a><a id="sthref724" name="sthref724"></a>triggers to populate auditing columns (such as <code>CREATED_ON</code> and <code>CREATED_BY</code>), you must preserve your source table data by having the trigger set a new value only if the current value is null, with code like this:</p>
<pre xml:space="preserve" class="oac_no_warn">
IF :NEW.CREATED_ON IS NULL THEN
  :NEW.CREATED_ON := SYSDATE;
END IF;
</pre>
<div class="helpinfonotealso">
<h2>Related Topics</h2>
<p><a href="tdddg_triggers002.htm#BABDAGJJ">Creating Triggers</a></p>
<p><a href="tdddg_deploying005.htm#BABIIBHE">Creating Installation Script Files</a></p>
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