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	<title>MySQL++ Reference Manual</title>
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<p>Declares classes that implement SQL "null" semantics within C++'s type system.  
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &quot;<a class="el" href="exceptions_8h_source.html">exceptions.h</a>&quot;</code><br/>
<code>#include &lt;iostream&gt;</code><br/>
<code>#include &lt;string&gt;</code><br/>
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<p><a href="null_8h_source.html">Go to the source code of this file.</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="nested-classes"></a>
Classes</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classmysqlpp_1_1null__type.html">mysqlpp::null_type</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">The type of the global mysqlpp::null object.  <a href="classmysqlpp_1_1null__type.html#details">More...</a><br/></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structmysqlpp_1_1NullIsNull.html">mysqlpp::NullIsNull</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Class for objects that define SQL null in terms of MySQL++'s <a class="el" href="classmysqlpp_1_1null__type.html" title="The type of the global mysqlpp::null object. ">null_type</a>.  <a href="structmysqlpp_1_1NullIsNull.html#details">More...</a><br/></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structmysqlpp_1_1NullIsZero.html">mysqlpp::NullIsZero</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Class for objects that define SQL null as 0.  <a href="structmysqlpp_1_1NullIsZero.html#details">More...</a><br/></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structmysqlpp_1_1NullIsBlank.html">mysqlpp::NullIsBlank</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Class for objects that define SQL null as a blank C string.  <a href="structmysqlpp_1_1NullIsBlank.html#details">More...</a><br/></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classmysqlpp_1_1Null.html">mysqlpp::Null&lt; Type, Behavior &gt;</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Class for holding data from a SQL column with the NULL attribute.  <a href="classmysqlpp_1_1Null.html#details">More...</a><br/></td></tr>
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template&lt;class Type , class Behavior &gt; </td></tr>
<tr class="memitem:ac214a288279ed7ccfc2c5b6219a83821"><td class="memTemplItemLeft" align="right" valign="top">std::ostream &amp;&#160;</td><td class="memTemplItemRight" valign="bottom"><b>mysqlpp::operator&lt;&lt;</b> (std::ostream &amp;o, const Null&lt; Type, Behavior &gt; &amp;n)</td></tr>
<tr class="memdesc:ac214a288279ed7ccfc2c5b6219a83821"><td class="mdescLeft">&#160;</td><td class="mdescRight">Inserts null-able data into a C++ stream if it is not actually null. Otherwise, insert something appropriate for null data. <br/></td></tr>
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const std::string&#160;</td><td class="memItemRight" valign="bottom"><b>mysqlpp::null_str</b></td></tr>
<tr class="memdesc:afe6d3a4c5d24603fa2bde1a36fbc6b86"><td class="mdescLeft">&#160;</td><td class="mdescRight">"NULL" string constant <br/></td></tr>
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<tr class="memitem:a1a8f2c546401c800672ddcc7fc9abd62"><td class="memItemLeft" align="right" valign="top">const null_type&#160;</td><td class="memItemRight" valign="bottom"><b>mysqlpp::null</b> = null_type()</td></tr>
<tr class="memdesc:a1a8f2c546401c800672ddcc7fc9abd62"><td class="mdescLeft">&#160;</td><td class="mdescRight">Global 'null' instance. Use wherever you need a SQL null.  <a href="#a1a8f2c546401c800672ddcc7fc9abd62">More...</a><br/></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Declares classes that implement SQL "null" semantics within C++'s type system. </p>
<p>This is required because C++'s own NULL type is not semantically the same as SQL nulls. </p>
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