114 lines
5.4 KiB
HTML
114 lines
5.4 KiB
HTML
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<meta name="DC.Title" content="Implicit connection management for nondefault activation groups" />
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<meta name="abstract" content="The application requester can implicitly connect to an application server." />
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<title>Implicit connection management for nondefault activation groups</title>
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</head>
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<body id="rbal1nondefault"><a name="rbal1nondefault"><!-- --></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">Implicit connection management for nondefault activation groups</h1>
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<div><p>The application requester can implicitly connect to an application
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server.</p>
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<div class="section"><p>Implicit connection occurs when the application requester detects
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the first SQL statement issued for the activation group and it is not a CONNECT
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statement with parameters.</p>
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<p>For a distributed program, the implicit connection
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is made to the relational database specified on the RDB parameter. For a nondistributed
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program, the implicit connection is made to the local relational database.</p>
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</div>
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<div class="section"><p>Implicit disconnection can occur at the following parts of a process:
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</p>
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<ul><li>When the activation group ends, if commitment control is not active, activation
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group level commitment control is active, or the job level commitment definition
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is at a unit of work boundary. <p>If the job level commitment definition
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is active and not at a unit of work boundary then SQL is placed in the exited
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state.</p>
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</li>
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<li>If SQL is in the exited state, when the job level commitment definition
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is committed or rolled back.</li>
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<li>At the end of a job.</li>
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</ul>
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</div>
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<div class="section"><p>The following example program is not distributed (no connection
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is required). It is a program run at a Spiffy Corporation regional office
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to gather local repair information into a report. </p>
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</div>
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<div class="section"><div class="note"><span class="notetitle">Note:</span> By using the code examples, you agree to the terms of the <a href="codedisclaimer.htm">Code license and disclaimer information</a>.</div>
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<pre>CRTSQL<em>xxx</em> PGM(SPIFFY/FIXTOTAL) COMMIT(*CHG) RDB(*NONE)
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PROC: FIXTOTAL;
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.
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.
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.
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SELECT * INTO :SERVICE <strong><span>A</span></strong>
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FROM REPAIRTOT;
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EXEC SQL
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COMMIT;
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.
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.
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.
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END FIXTOTAL;</pre>
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</div>
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<div class="section"> <dl><dt class="dlterm"><strong><span>A</span></strong></dt>
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<dd>Statement run on the local relational database</dd>
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</dl>
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</div>
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<div class="section"><p>Another program, such as the following example, can gather the
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same information from Spiffy dealerships in the Kansas City region. This is
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an example of a distributed program that is implicitly connected and disconnected:
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</p>
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<pre>CRTSQL<em>xxx</em> PGM(SPIFFY/FIXES) COMMIT(*CHG) RDB(KC101) RDBCNNMTH(*RUW)
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PROC: FIXES;
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.
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.
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.
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EXEC SQL
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SELECT * INTO :SERVICE <strong><span>B</span></strong>
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FROM SPIFFY.REPAIR1;
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EXEC SQL <strong><span>C</span></strong>
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COMMIT;
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.
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.
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.
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END FIXES; <strong><span>D</span></strong></pre>
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<dl><dt class="dlterm"><strong><span>B</span></strong></dt>
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<dd>Implicit connection to application server (AS). The statement
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runs on the AS.</dd>
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<dt class="dlterm"><strong><span>C</span></strong></dt>
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<dd>End of unit of work. The application requester (AR) is placed in a connectable
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and connected state if the COMMIT is successful.</dd>
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<dt class="dlterm"><strong><span>D</span></strong></dt>
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<dd>Implicit disconnection at the end of the SQL program.</dd>
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</dl>
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</div>
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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="rbal1cnct.htm" title="What makes a distributed relational database application distributed is its ability to connect to a relational database on another server.">Connect to a distributed relational database</a></div>
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</div>
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</div>
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</body>
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