97 lines
8.3 KiB
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97 lines
8.3 KiB
HTML
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<title>Code SQL statements in C and C++ applications</title>
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<body id="rzajpc"><a name="rzajpc"><!-- --></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">Code SQL statements in C and C++ applications</h1>
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<div><p>This topic describes the unique application and coding requirements
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for embedding SQL statements in a C or C++ program.</p>
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<p>C program refers to ILE C for <span class="keyword">iSeries™</span> programs.
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C++ program refers to ILE C++ programs. This topic also defines the requirements
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for host structures and host variables. For more details, see the following
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sections: </p>
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<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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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rzajpsqlcac.htm">Define the SQL communications area in C and C++ applications that use SQL</a></strong><br />
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A C or C++ program can be written to use the SQLCA to check return status for embedded SQL statements, or the program can use the SQL diagnostics area to check return status.</li>
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<li class="ulchildlink"><strong><a href="rzajpsqldac.htm">Define SQL descriptor areas in C and C++ applications that use SQL</a></strong><br />
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<span><img src="./delta.gif" alt="Start of change" />There are two types of SQL descriptor areas.
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One is defined with the ALLOCATE DESCRIPTOR statement. The other is defined
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using the SQL descriptor area (SQLDA) structure. In this topic, only the SQLDA
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form is discussed.<img src="./deltaend.gif" alt="End of change" /></span></li>
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<li class="ulchildlink"><strong><a href="rzajpembedsqlc.htm">Embed SQL statements in C and C++ applications that use SQL</a></strong><br />
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SQL statements can be coded in a C or C++ program wherever executable statements can appear.</li>
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<li class="ulchildlink"><strong><a href="rzajphostsqlc.htm">Use host variables in C and C++ applications that use SQL</a></strong><br />
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All host variables used in SQL statements must be explicitly declared prior to their first use.</li>
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<li class="ulchildlink"><strong><a href="rzajphoststrucc.htm">Use host structures in C and C++ applications that use SQL</a></strong><br />
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In C and C++ programs, you can define a <em>host structure</em>,
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which is a named set of elementary C or C++ variables.</li>
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<li class="ulchildlink"><strong><a href="rzajphostarrayc.htm">Use arrays of host structures in C and C++ applications that use SQL</a></strong><br />
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In C and C++ programs, you can define a host structure array that has the dimension attribute. Host structure arrays have a maximum of two levels, even though the array might occur within a multiple-level structure. Another structure is not needed if a varying-length character string or a varying-length graphic string is not used.</li>
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<li class="ulchildlink"><strong><a href="rzajppointerdtc.htm">Use pointer data types in C and C++ applications that use SQL</a></strong><br />
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You can also declare host variables that are pointers to the supported C and C++ data types, with the following restrictions.</li>
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<li class="ulchildlink"><strong><a href="rzajptypedefc.htm">Use typedef in C and C++ applications that use SQL</a></strong><br />
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You can also use the typedef declarations to define your own identifiers that will be used in place of C type specifiers such as short, float, and double.</li>
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<li class="ulchildlink"><strong><a href="rzajpilecc.htm">Use ILE C compiler external file descriptions in C and C++ applications that use SQL</a></strong><br />
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You can use the C or C++ #pragma mapinc directive with the #include directive to include external file descriptions in your program.</li>
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<li class="ulchildlink"><strong><a href="rzajpequivsqlc.htm">Determine equivalent SQL and C or C++ data types</a></strong><br />
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The precompiler determines the base SQLTYPE and SQLLEN of host variables based on the following table. If a host variable appears with an indicator variable, the SQLTYPE is the base SQLTYPE plus one.</li>
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<li class="ulchildlink"><strong><a href="rzajpindvard.htm">Use indicator variables in C and C++ applications that use SQL</a></strong><br />
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An indicator variable is a two-byte integer (short int).</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="rzajpkickoff.htm" title="This topic collection explains how to create database applications in host languages that use DB2 Universal Database for iSeries SQL statements and functions.">Embedded SQL programming</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzajpwritesqlapp.htm" title="You can create database applications in host languages that use DB2 UDB for iSeries SQL statements and functions.">Write applications that use SQL</a></div>
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<div><a href="rzajperrorandwarning.htm" title="The conditions described in the following topics could produce an error or warning message during an attempted compile process.">Error and warning messages during a compile of application programs that use SQL</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="rzajpsamprog.htm" title="This topic contains a sample application showing how to code SQL statements in each of the languages supported by the DB2 UDB for iSeries system.">Sample programs using DB2 UDB for iSeries statements</a></div>
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</div>
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