69 lines
4.6 KiB
HTML
69 lines
4.6 KiB
HTML
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Routines" />
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<meta name="abstract" content="Routines are pieces of code or programs that you can call to perform operations." />
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<meta name="description" content="Routines are pieces of code or programs that you can call to perform operations." />
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<title>Routines</title>
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<body id="rbafyroutines"><a name="rbafyroutines"><!-- --></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">Routines</h1>
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<div><p>Routines are pieces of code or programs that you can call to perform
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operations.</p>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rbafysproeg.htm">Stored procedures</a></strong><br />
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A <em>procedure</em> (often called a stored procedure) is a program
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that can be called to perform operations that can include both host language
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statements and SQL statements. Procedures in SQL provide the same benefits
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as procedures in a host language.</li>
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<li class="ulchildlink"><strong><a href="rbafyudf.htm">Use user-defined functions (UDFs)</a></strong><br />
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In writing SQL applications, you can implement some actions or operations as a UDF or as a subroutine in your application: Although it may appear easier to implement new operations as subroutines in your application, you might want to consider the advantages of using a UDF instead.</li>
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<li class="ulchildlink"><strong><a href="rbafydb2triggers.htm">Triggers</a></strong><br />
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A <em>trigger</em> is a set of actions that are run automatically
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when a specified change operation is performed on a specified table or view.
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The change operation can be an SQL INSERT, UPDATE, or DELETE statement, or
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an insert, update, or delete high-level language statement in an application
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program. Triggers are useful for tasks such as enforcing business rules, validating
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input data, and keeping an audit trail.</li>
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<li class="ulchildlink"><strong><a href="rbafydebugproc.htm">Debug an SQL routine</a></strong><br />
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By specifying SET OPTION DBGVIEW = *SOURCE in your Create SQL Procedure, Create SQL Function, or Create Trigger statement, you can debug the generated program or module at the SQL statement level.</li>
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<li class="ulchildlink"><strong><a href="rbafyudfperf.htm">Improve performance of procedures and functions</a></strong><br />
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When creating stored procedures and user-defined functions (UDFs),
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the SQL procedural language processor on the iSeries™ does not always generate the
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most efficient code. However, you can do some changes to reduce the number
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of database engine calls needed and improve performance. </li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbafykickoff.htm" title="These topics describe the iSeries server implementation of the Structured Query Language (SQL) using DB2 UDB for iSeries and the DB2 UDB Query Manager and SQL Development Kit Version 5 licensed program.">SQL programming</a></div>
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