71 lines
4.4 KiB
HTML
71 lines
4.4 KiB
HTML
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<meta name="DC.Title" content="How trigger programs work" />
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<meta name="abstract" content="When a user or application issues a change or read operation on a database file that has an associated trigger, the operation calls the appropriate trigger program or programs." />
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<title>How trigger programs work</title>
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<body id="rbaforzahftrb1"><a name="rbaforzahftrb1"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">How trigger programs work</h1>
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<div><p><span><img src="./delta.gif" alt="Start of change" />When a user or application issues
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a change or read operation on a database file that has an associated trigger,
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the operation calls the appropriate trigger program or programs.<img src="./deltaend.gif" alt="End of change" /></span></p>
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<p>The change or read operation passes two parameters to the trigger program,
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as described in the following table.</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><thead align="left"><tr><th valign="top" width="18.71794871794872%" id="d0e26">Parameter</th>
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<th valign="top" width="34.87179487179487%" id="d0e28">Description</th>
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<th valign="top" width="23.076923076923077%" id="d0e30">Input or output</th>
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<th valign="top" width="23.333333333333332%" id="d0e32">Type</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" width="18.71794871794872%" headers="d0e26 ">1</td>
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<td valign="top" width="34.87179487179487%" headers="d0e28 ">Trigger buffer, which contains the information about
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the current change operation that is calling this trigger program. </td>
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<td valign="top" width="23.076923076923077%" headers="d0e30 ">Input</td>
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<td valign="top" width="23.333333333333332%" headers="d0e32 ">CHAR(*)</td>
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</tr>
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<tr><td valign="top" width="18.71794871794872%" headers="d0e26 ">2</td>
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<td valign="top" width="34.87179487179487%" headers="d0e28 ">Trigger buffer length.</td>
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<td valign="top" width="23.076923076923077%" headers="d0e30 ">Input</td>
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<td valign="top" width="23.333333333333332%" headers="d0e32 ">BINARY(4)</td>
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</tr>
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</tbody>
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</table>
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</div>
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<p>From these inputs, the trigger program can refer to a copy of the original
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or the new records. You must code the trigger program so that it accepts these
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parameters.</p>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbaforzahftrb.htm" title="These topics discuss how to create and work with trigger programs.">Create trigger programs</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rbaforzahftrc.htm" title="The trigger buffer has two logical sections: a static section and a variable section.">Trigger buffer sections</a></div>
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