85 lines
6.4 KiB
HTML
85 lines
6.4 KiB
HTML
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<meta name="DC.Title" content="Transaction processing task in a DB2 UDB CLI application" />
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<meta name="abstract" content="This topic shows a typical order of function calls in a DB2 UDB CLI application." />
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<meta name="DC.subject" content="SQLAllocStmt, function, overview, SQLBindCol, function, SQLColAttributes, function, SQLDataSources, function, SQLDescribeCol, function, SQLExecDirect, function, SQLExecute, function, SQLFetch, function, SQLFreeStmt, function, SQLGetData, function, SQLNumResultCols, function, SQLPrepare, function, SQLRowCount, function, SQLSetParam, function, SQLTransact, function" />
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<meta name="keywords" content="SQLAllocStmt, function, overview, SQLBindCol, function, SQLColAttributes, function, SQLDataSources, function, SQLDescribeCol, function, SQLExecDirect, function, SQLExecute, function, SQLFetch, function, SQLFreeStmt, function, SQLGetData, function, SQLNumResultCols, function, SQLPrepare, function, SQLRowCount, function, SQLSetParam, function, SQLTransact, function" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1999, 2006" />
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Transaction processing task in a DB2 UDB CLI application</title>
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</head>
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<body id="rzadphdptran"><a name="rzadphdptran"><!-- --></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">Transaction processing task in a DB2 UDB CLI application</h1>
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<div><p>This topic shows a typical order of function calls in a DB2<sup>®</sup> UDB CLI application.</p>
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<div class="p">The typical order of function calls in a DB2 UDB CLI application
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is shown in the following figure. The figure does not show all functions or
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possible paths. <div class="fignone" id="rzadphdptran__fgovvc"><a name="rzadphdptran__fgovvc"><!-- --></a><span class="figcap">Figure 1. Transaction processing</span><br /><img src="rv3w323.gif" alt="Transaction Processing" /><br /></div>
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</div>
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<div class="p">The figure shows the steps and the DB2 UDB CLI functions in the transaction
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processing task. This task contains these steps:<ol><li><a href="rzadpallocate.htm#rzadpallocate">Allocate statement handle(s) in a DB2 UDB CLI application</a></li>
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<li><a href="rzadpprepexec.htm#rzadpprepexec">Preparation and processing tasks in a DB2 UDB CLI application</a></li>
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<li><a href="rzadpprocessresults.htm#rzadpprocessresults">Processing results in a DB2 UDB CLI application</a></li>
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<li><a href="rzadpfreestatementhandles.htm#rzadpfreestatementhandles">Free statement handles in a DB2 UDB CLI application</a></li>
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<li><a href="rzadpcommitrollback.htm#rzadpcommitrollback">Commit or roll back in a DB2 UDB CLI application</a></li>
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</ol>
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</div>
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<p>The function SQLAllocStmt is needed to obtain a statement handle that is
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used to process the SQL statement. There are two methods of statement processing
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that can be used. By using SQLPrepare and SQLExecute, the program can break
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the process into two steps. The function SQLBindParameter is used to bind
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program addresses to host variables used in the prepared SQL statement.
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The second method is the direct processing method in which SQLPrepare and
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SQLExecute are replaced by a single call to SQLExecDirect.</p>
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<p>As soon as the statement is processed, the remaining processing depends on the
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type of SQL statement. For SELECT statements, the program uses functions like
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SQLNumResultCols, SQLDescribeCol, SQLBindCol, SQLFetch, and SQLCloseCursor
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to process the result set. For statements that update data, SQLRowCount can
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be used to determine the number of affected rows. For other types of SQL statements,
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the processing is complete after the statement is processed. SQLFreeStmt is
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then used in all cases to indicate that the handle is no longer needed.</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="rzadpallocate.htm">Allocate statement handle(s) in a DB2 UDB CLI application</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzadpprepexec.htm">Preparation and processing tasks in a DB2 UDB CLI application</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzadpprocessresults.htm">Processing results in a DB2 UDB CLI application</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzadpfreestatementhandles.htm">Free statement handles in a DB2 UDB CLI application</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzadpcommitrollback.htm">Commit or roll back in a DB2 UDB CLI application</a></strong><br />
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</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="rzadphdovv.htm" title="Find out how you code your applications to use the DB2 CLI functions.">Write a DB2 UDB CLI application</a></div>
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</div>
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</div>
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</body>
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</html>
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