103 lines
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HTML
103 lines
6.6 KiB
HTML
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<meta name="abstract" content="Program interfaces using SQL return error information to the application program when an error occurs. SQLSTATEs and their corresponding SQLCODEs are returned to the application program in either the SQL communication area (SQLCA) or the SQL diagnostic area." />
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<title>SQLCODEs and SQLSTATEs</title>
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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">SQLCODEs and SQLSTATEs</h1>
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<div><p>Program interfaces using SQL return error information to the application
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program when an error occurs. SQLSTATEs and their corresponding SQLCODEs are
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returned to the application program in either the SQL communication area (SQLCA)
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or the SQL diagnostic area.</p>
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<div class="section"><p>An SQLCA is a collection of variables in a control block in space
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provided by the application that is updated by the database management system
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with information about the SQL statement most recently run. An SQL diagnostic
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area is a more complex storage area in space provided by the database manager
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that is designed to communicate more extensive information about the SQL statement
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most recently run. </p>
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</div>
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<div class="section"><p>When an SQL error is detected, a five-character global variable
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called the SQLSTATE identifies the nature of the error. In addition to the
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SQLSTATE, an integer SQLCODE is also available. However, the SQLCODE does
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not return the same return code for the same error condition among the current
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four IBM<sup>®</sup> relational
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database products. SQLSTATE has been designed so that application programs
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can test for specific error conditions or classes of errors regardless of
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which DB2<sup>®</sup> product
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the application is connected to.</p>
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</div>
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<div class="section"><p>If SQL encounters a hard error while processing a statement, the
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SQLCODE is a negative number (for example, SQLCODE -204). If SQL encounters
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an exceptional but valid condition (warning) while processing a statement,
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the SQLCODE is a positive number (for example, SQLCODE +100). If SQL encounters
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no error or exceptional condition while processing a statement, the SQLCODE
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is 0. Every <span class="keyword">DB2 Universal Database™ for iSeries™</span> SQLCODE
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has a corresponding message in message file QSQLMSG in library QSYS. For example,
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SQLCODE -204 is logged as message ID SQL0204.</p>
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</div>
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<div class="section"><p>Because the returned error information is a valuable problem-diagnosis
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tool, it is a good idea to include in your application programs the instructions
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necessary to display some of the information contained in either the returned
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SQLCA or SQL diagnostic area. The message tokens discussed here are also very
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valuable for problem diagnosis:</p>
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</div>
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<div class="section"><ul><li>SQLSTATE <p>Return code.</p>
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</li>
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<li>SQLCODE (SQLCA) or DB2_RETURNED_SQLCODE (SQL diagnostic area) <p>Return
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code.</p>
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</li>
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<li>SQLERRD(3) (SQLCA) or ROW_COUNT (SQL diagnostic area) <p>The number of
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rows updated, inserted, or deleted by SQL.</p>
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</li>
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</ul>
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</div>
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<div class="section"><p>The complete message can be viewed online by using the <span class="cmdname">Display
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Message Description (DSPMSGD)</span> command.</p>
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</div>
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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="rbal1aspcoda.htm">Distributed relational database SQLCODEs and SQLSTATEs</a></strong><br />
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The list provides some of the common SQLCODEs and SQLSTATEs associated with distributed relational database processing.</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="rbal1appprob.htm" title="The best time to handle a problem with an application is before it goes into production. However, it is impossible to anticipate all the conditions that will exist for an application when it gets into general use.">Application problems</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../db2/rbafzmst02.htm">SQL reference</a></div>
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<div><a href="../rzala/rzalakickoff.htm">SQL messages and codes</a></div>
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<div><a href="../cl/dspmsgd.htm">Display Message Description (DSPMSGD) command</a></div>
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</div>
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</div>
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</body>
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