87 lines
5.7 KiB
HTML
87 lines
5.7 KiB
HTML
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<meta name="DC.Title" content="Write a DB2 UDB CLI application" />
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<meta name="abstract" content="Find out how you code your applications to use the DB2 CLI functions." />
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<title>Write a DB2 UDB
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CLI application</title>
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<body id="rzadphdovv"><a name="rzadphdovv"><!-- --></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">Write a DB2 UDB
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CLI application</h1>
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<div><p>Find out how you code your applications to use the DB2<sup>®</sup> CLI functions.</p>
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<p>A DB2 UDB
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CLI application consists of a set of tasks, each comprised of a set of discrete
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steps. Other tasks might occur throughout the application as it runs. The
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application calls one or more DB2 UDB CLI functions to carry out each
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of these tasks.</p>
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<p>Every DB2 UDB CLI application
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contains the three main tasks that are shown in the following figure. If the
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functions are not called in the sequence that is shown in the figure, an error
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results.</p>
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<div class="fignone" id="rzadphdovv__fgovva"><a name="rzadphdovv__fgovva"><!-- --></a><span class="figcap">Figure 1. Conceptual view of a DB2 UDB CLI application</span><br /><img src="rv3w321.gif" alt="Conceptual View of a DB2
UDB CLI Application" /><br /></div>
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<p>The <em>initialization</em> task allocates and initializes resources in preparation
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for the main <em>Transaction Processing</em> task.</p>
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<p>The <em>transaction processing</em> task, the main task of the application,
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passes queries and modifications to the SQL to DB2 UDB CLI.</p>
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<p>The <em>termination</em> task frees allocated resources. The resources generally
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consist of data areas that are identified by unique handles. After freeing
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the resources, other tasks can use these handles.</p>
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<p>In addition to the three central tasks that control a DB2 UDB CLI application,
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there are numerous <em>general</em> tasks, such as diagnostic message
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handlers, throughout an application.</p>
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<p>See <a href="rzadpclilist.htm#rzadpclilist">Categories of DB2 UDB CLIs</a> for an overview
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of how the CLI functions fit into these key task areas.</p>
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<p>This topic provides examples to illustrate how these functions are used
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in a DB2 UDB
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CLI application.</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="rzadphditerm.htm">Initialization and termination tasks in a DB2 UDB CLI application</a></strong><br />
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The initialization task allocates and initializes environment handles and connection handles.</li>
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<li class="ulchildlink"><strong><a href="rzadphdptran.htm">Transaction processing task in a DB2 UDB CLI application</a></strong><br />
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This topic shows a typical order of function calls in a DB2 UDB CLI application.</li>
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<li class="ulchildlink"><strong><a href="rzadphddiag.htm">Diagnostics in a DB2 UDB CLI application</a></strong><br />
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This topic deals with warning or error conditions generated within an application.</li>
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<li class="ulchildlink"><strong><a href="rzadphddtdcn.htm">Data types and data conversion in DB2 UDB CLI functions</a></strong><br />
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This topics shows all of the supported SQL types and their corresponding symbolic names.</li>
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<li class="ulchildlink"><strong><a href="rzadpstringarguments.htm">Work with string arguments in DB2 UDB CLI functions</a></strong><br />
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These topics discuss some conventions when dealing with the various
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aspects of working with string arguments in DB2 UDB CLI functions.</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="rzadpkickoff.htm" title="DB2 UDB call level interface (CLI) is a callable Structured Query Language (SQL) programming interface that is supported in all DB2 environments except for DB2 Universal Database for z/OS and DB2 Server for VSE and VM.">SQL call level interface</a></div>
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</div>
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</body>
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