147 lines
8.6 KiB
HTML
147 lines
8.6 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Title" content="Host structure declarations in C and C++ applications that use SQL" />
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<meta name="abstract" content="These figures show the valid syntax for host structure declarations." />
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<meta name="description" content="These figures show the valid syntax for host structure declarations." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<title>Host structure declarations in C and C++ applications that use SQL</title>
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</head>
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<body id="rzajphoststrucdeclaration"><a name="rzajphoststrucdeclaration"><!-- --></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">Host structure declarations in C and C++ applications that use SQL</h1>
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<div><p>These figures show the valid syntax for host structure declarations.</p>
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<div class="section"><h4 class="sectiontitle">Host Structures</h4> <pre><span><img src="./c.gif" border="0" alt="Read syntax diagram" longdesc="rzajphoststrucdeclarationsyn1.htm" /></span><a href="#d0e16"><img src="./c.gif" border="0" alt="Skip visual syntax diagram" /></a>
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>>-+--------+--+----------+--+---------+--struct--+-----+--{---->
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+-auto---+ +-const----+ '-_Packed-' '-<i>tag</i>-'
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+-extern-+ '-volatile-'
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'-static-'
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.----------------------------------------------------------------.
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| .-,-----. |
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V V | |
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>----+-+-float----------------------------------+----<i>var-1</i>-+-- ; -+-+--}-->
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| +-double---------------------------------+ |
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| +-decimal (--<i>precision</i>--+----------+--)--+ |
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| | '-,--<i>scale</i>-' | |
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| | .-int-. | |
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| +-+-+--------+--+-long long-+--+-----+-+-+ |
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| | | '-signed-' +-long------+ | | |
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| | | '-short-----' | | |
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| | +-sqlint32---------------------------+ | |
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| | '-sqlint64---------------------------' | |
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| +-<i>varchar-structure</i>----------------------+ |
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| +-<i>vargraphic-structure</i>-------------------+ |
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| +-<i>lob</i>------------------------------------+ |
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| +-<i>SQL-varchar</i>----------------------------+ |
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| +-<i>rowid</i>----------------------------------+ |
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| '-<i>binary</i>---------------------------------' |
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| .-,-----------------------. |
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| V | |
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+-+----------+--char----<i>var-2</i>--+--------------+-+-- ; -------+
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| +-signed---+ '-[--<i>length</i>--]-' |
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| '-unsigned-' |
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| .-,-----------------------. |
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| V | |
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'-wchar_t----<i>var-5</i>--+--------------+-+-- ; ------------------'
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'-[--<i>length</i>--]-'
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.-,----------------------------------.
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V |
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>----<i>variable-name</i>--+-----------------+-+-- ; -----------------><
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'- = --<i>expression</i>-'
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varchar-structure
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.-int-.
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|--struct--+-----+--{--+--------+--short--+-----+--<i>var-3</i>-- ; --->
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'-<i>tag</i>-' '-signed-'
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>--+----------+--char--<i>var-4</i>--[--<i>length</i>--]-- ; --}--------------|
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+-signed---+
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'-unsigned-'
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</pre><a name="d0e16"></a></div>
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<div class="section"><h4 class="sectiontitle">Host Structures (continued)</h4> <pre><span><img src="./c.gif" border="0" alt="Read syntax diagram" longdesc="rzajphoststrucdeclarationsyn2.htm" /></span><a href="#d0e196"><img src="./c.gif" border="0" alt="Skip visual syntax diagram" /></a>
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vargraphic-structure
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.-int-.
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|--struct--+-----+--{--+--------+--short--+-----+--------------->
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'-<i>tag</i>-' '-signed-'
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>--<i>var-6</i>-- ; --wchar_t--<i>var-7</i>--[--<i>length</i>--]-- ; --}-------------|
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lob
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|--SQL TYPE IS--+-+-CLOB---+--(--<i>length</i>--+---+--)-+-------------|
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| +-DBCLOB-+ +-K-+ |
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| '-BLOB---' +-M-+ |
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| '-G-' |
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+-+-CLOB_LOCATOR---+--------------+
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| +-DBCLOB_LOCATOR-+ |
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| '-BLOB_LOCATOR---' |
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'-+-CLOB_FILE---+-----------------'
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+-DBCLOB_FILE-+
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'-BLOB_FILE---'
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SQL-varchar
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|--VARCHAR--<i>variable-name</i>--[--<i>length</i>--]-------------------------|
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rowid
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|--SQL TYPE IS ROWID--------------------------------------------|
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binary
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|--SQL TYPE IS--+-BINARY---------+--(--<i>length</i>--)----------------|
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+-VARBINARY------+
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'-BINARY VARYING-'
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</pre><a name="d0e196"></a></div>
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<div class="section"> <div class="note"><span class="notetitle">Notes:</span> <ol><li>For details on declaring numeric, character, graphic, LOB, ROWID, and
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binary host variables, see the notes under numeric, character, graphic, LOB,
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ROWID, and binary host variables.</li>
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<li>A structure of a short int followed by either a char or wchar_t array
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is always interpreted by the SQL C and C++ precompilers as either a VARCHAR
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or VARGRAPHIC structure.</li>
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<li>_Packed must not be used in C++. Instead, specify #pragma pack(1) prior
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to the declaration and #pragma pack() after the declaration. <pre>#pragma pack(1)
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struct {
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short myshort;
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long mylong;
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char mychar[5];
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} a_st;
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#pragma pack()</pre>
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</li>
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<li>If using sqlint32 or sqlint64, the header file sqlsystm.h must be included.</li>
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</ol>
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</div>
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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="rzajphoststrucc.htm" title="In C and C++ programs, you can define a host structure, which is a named set of elementary C or C++ variables.">Use host structures in C and C++ applications that use SQL</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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