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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<b>mysqlpp</b>::<a class="el" href="classmysqlpp_1_1Null.html">Null</a></div>
<h1>mysqlpp::Null< Type, Behavior > Class Template Reference</h1><!-- doxytag: class="mysqlpp::Null" -->Class for holding data from a SQL column with the NULL attribute.
<a href="#_details">More...</a>
<p>
<code>#include <<a class="el" href="null_8h-source.html">null.h</a>></code>
<p>
Collaboration diagram for mysqlpp::Null< Type, Behavior >:<p><center><img src="classmysqlpp_1_1Null__coll__graph.png" border="0" usemap="#mysqlpp_1_1Null_3_01Type_00_01Behavior_01_4__coll__map" alt="Collaboration graph"></center>
<center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center><a href="classmysqlpp_1_1Null-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Public Types</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ca01e95f7308d0601463e941857245ac"></a><!-- doxytag: member="mysqlpp::Null::value_type" ref="ca01e95f7308d0601463e941857245ac" args="" -->
typedef Type </td><td class="memItemRight" valign="bottom"><a class="el" href="classmysqlpp_1_1Null.html#ca01e95f7308d0601463e941857245ac">value_type</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Type of the data stored in this object, when it is not equal to SQL null. <br></td></tr>
<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classmysqlpp_1_1Null.html#a776139d049ac32aa7850ecd5e623b8f">Null</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Default constructor. <a href="#a776139d049ac32aa7850ecd5e623b8f"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classmysqlpp_1_1Null.html#738398c6aa00bd5a4d691f6277e453ca">Null</a> (const Type &x)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Initialize the object with a particular value. <a href="#738398c6aa00bd5a4d691f6277e453ca"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classmysqlpp_1_1Null.html#b04ae6dc7e0e4ad80021014a6e241b67">Null</a> (const <a class="el" href="classmysqlpp_1_1null__type.html">null_type</a> &)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Construct a <a class="el" href="classmysqlpp_1_1Null.html">Null</a> equal to SQL null. <a href="#b04ae6dc7e0e4ad80021014a6e241b67"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classmysqlpp_1_1Null.html#fe802f73095c32d205cf211c0f57ea15">operator Type &</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Converts this object to Type. <a href="#fe802f73095c32d205cf211c0f57ea15"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classmysqlpp_1_1Null.html">Null</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classmysqlpp_1_1Null.html#166ecaa4b711982efe2d8ceee57cd06a">operator=</a> (const Type &x)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Assign a value to the object. <a href="#166ecaa4b711982efe2d8ceee57cd06a"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classmysqlpp_1_1Null.html">Null</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classmysqlpp_1_1Null.html#feeb2bf706bb7790a6f875783000bced">operator=</a> (const <a class="el" href="classmysqlpp_1_1null__type.html">null_type</a> &n)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Assign SQL null to this object. <a href="#feeb2bf706bb7790a6f875783000bced"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classmysqlpp_1_1Null.html#cbc1510c2656a7bf6f09ede8080946c3">operator==</a> (const <a class="el" href="classmysqlpp_1_1Null.html">Null</a>< Type > &rhs) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Do equality comparison of two nullable values. <a href="#cbc1510c2656a7bf6f09ede8080946c3"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classmysqlpp_1_1Null.html#cc421c483f46260347daf6ab6a05d301">operator==</a> (const <a class="el" href="classmysqlpp_1_1null__type.html">null_type</a> &) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Do equality comparison against hard-coded SQL null. <a href="#cc421c483f46260347daf6ab6a05d301"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="e6a5550e3c7c388b558a737b50c7d903"></a><!-- doxytag: member="mysqlpp::Null::operator!=" ref="e6a5550e3c7c388b558a737b50c7d903" args="(const Null< Type > &rhs) const " -->
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classmysqlpp_1_1Null.html#e6a5550e3c7c388b558a737b50c7d903">operator!=</a> (const <a class="el" href="classmysqlpp_1_1Null.html">Null</a>< Type > &rhs) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Do inequality comparison of two nullable values. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="e15fb952f10e58d7c310878c479a593e"></a><!-- doxytag: member="mysqlpp::Null::operator!=" ref="e15fb952f10e58d7c310878c479a593e" args="(const null_type &rhs) const " -->
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classmysqlpp_1_1Null.html#e15fb952f10e58d7c310878c479a593e">operator!=</a> (const <a class="el" href="classmysqlpp_1_1null__type.html">null_type</a> &rhs) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Do inequality comparison against hard-coded SQL null. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classmysqlpp_1_1Null.html#3f9fdc80890654486e8d1f321af9e962">operator<</a> (const <a class="el" href="classmysqlpp_1_1Null.html">Null</a>< Type > &rhs) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Do less-than comparison of two nullable values. <a href="#3f9fdc80890654486e8d1f321af9e962"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classmysqlpp_1_1Null.html#6d446e98902211c226ae23a3cc13f4a6">operator<</a> (const <a class="el" href="classmysqlpp_1_1null__type.html">null_type</a> &) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Do less-than comparison against hard-coded SQL null. <a href="#6d446e98902211c226ae23a3cc13f4a6"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Public Attributes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="11c562b34e0f4f39f34cd36ace40c33e"></a><!-- doxytag: member="mysqlpp::Null::data" ref="11c562b34e0f4f39f34cd36ace40c33e" args="" -->
Type </td><td class="memItemRight" valign="bottom"><a class="el" href="classmysqlpp_1_1Null.html#11c562b34e0f4f39f34cd36ace40c33e">data</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">The object's value, when it is not SQL null. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classmysqlpp_1_1Null.html#2ce81045c6da00302bb3c998527aab7b">is_null</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">If set, this object is considered equal to SQL null. <a href="#2ce81045c6da00302bb3c998527aab7b"></a><br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
<h3>template<class Type, class Behavior = NullIsNull><br>
class mysqlpp::Null< Type, Behavior ></h3>
Class for holding data from a SQL column with the NULL attribute.
<p>
This template is necessary because there is nothing in the C++ type system with the same semantics as SQL's null. In SQL, a column can have the optional 'NULL' attribute, so there is a difference in type between, say an <code>int</code> column that can be null and one that cannot be. C++'s NULL constant does not have these features.<p>
It's important to realize that this class doesn't hold nulls, it holds data that <em>can</em> <em>be</em> null. It can hold a non-null value, you can then assign null to it (using MySQL++'s global <code>null</code> object), and then assign a regular value to it again; the object will behave as you expect throughout this process.<p>
Because one of the template parameters is a C++ type, the typeid() for a null <code>int</code> is different than for a null <code>string</code>, to pick two random examples. See type_info.cpp for the table SQL types that can be null.
<p>
<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="a776139d049ac32aa7850ecd5e623b8f"></a><!-- doxytag: member="mysqlpp::Null::Null" ref="a776139d049ac32aa7850ecd5e623b8f" args="()" -->
<div class="memitem">
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template<class Type, class Behavior = NullIsNull> </div>
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<td class="memname"><a class="el" href="classmysqlpp_1_1Null.html">mysqlpp::Null</a>< Type, Behavior >::<a class="el" href="classmysqlpp_1_1Null.html">Null</a> </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td width="100%"><code> [inline]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Default constructor.
<p>
"data" member is left uninitialized by this ctor, because we don't know what to initialize it to.
</div>
</div><p>
<a class="anchor" name="738398c6aa00bd5a4d691f6277e453ca"></a><!-- doxytag: member="mysqlpp::Null::Null" ref="738398c6aa00bd5a4d691f6277e453ca" args="(const Type &x)" -->
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template<class Type, class Behavior = NullIsNull> </div>
<table class="memname">
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<td class="memname"><a class="el" href="classmysqlpp_1_1Null.html">mysqlpp::Null</a>< Type, Behavior >::<a class="el" href="classmysqlpp_1_1Null.html">Null</a> </td>
<td>(</td>
<td class="paramtype">const Type & </td>
<td class="paramname"> <em>x</em> </td>
<td> ) </td>
<td width="100%"><code> [inline]</code></td>
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</div>
<div class="memdoc">
<p>
Initialize the object with a particular value.
<p>
The object is marked as "not null" if you use this ctor. This behavior exists because the class doesn't encode nulls, but rather data which <em>can</em> <em>be</em> null. The distinction is necessary because 'NULL' is an optional attribute of SQL columns.
</div>
</div><p>
<a class="anchor" name="b04ae6dc7e0e4ad80021014a6e241b67"></a><!-- doxytag: member="mysqlpp::Null::Null" ref="b04ae6dc7e0e4ad80021014a6e241b67" args="(const null_type &)" -->
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template<class Type, class Behavior = NullIsNull> </div>
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<td class="memname"><a class="el" href="classmysqlpp_1_1Null.html">mysqlpp::Null</a>< Type, Behavior >::<a class="el" href="classmysqlpp_1_1Null.html">Null</a> </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classmysqlpp_1_1null__type.html">null_type</a> & </td>
<td class="paramname"> </td>
<td> ) </td>
<td width="100%"><code> [inline]</code></td>
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<div class="memdoc">
<p>
Construct a <a class="el" href="classmysqlpp_1_1Null.html">Null</a> equal to SQL null.
<p>
This is typically used with the global <code>null</code> object. (Not to be confused with C's NULL type.) You can say something like... <div class="fragment"><pre class="fragment">
<span class="comment">/// </span>
</pre></div> ...to get a null <code>int</code>.
</div>
</div><p>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="fe802f73095c32d205cf211c0f57ea15"></a><!-- doxytag: member="mysqlpp::Null::operator Type &" ref="fe802f73095c32d205cf211c0f57ea15" args="()" -->
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template<class Type, class Behavior = NullIsNull> </div>
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<td class="memname"><a class="el" href="classmysqlpp_1_1Null.html">mysqlpp::Null</a>< Type, Behavior >::operator Type & </td>
<td>(</td>
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<td> ) </td>
<td width="100%"><code> [inline]</code></td>
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<p>
Converts this object to Type.
<p>
If is_null is set, returns whatever we consider that null "is", according to the Behavior parameter you used when instantiating this template. See <a class="el" href="structmysqlpp_1_1NullIsNull.html">NullIsNull</a>, <a class="el" href="structmysqlpp_1_1NullIsZero.html">NullIsZero</a> and <a class="el" href="structmysqlpp_1_1NullIsBlank.html">NullIsBlank</a>.<p>
Otherwise, just returns the 'data' member.
</div>
</div><p>
<a class="anchor" name="6d446e98902211c226ae23a3cc13f4a6"></a><!-- doxytag: member="mysqlpp::Null::operator<" ref="6d446e98902211c226ae23a3cc13f4a6" args="(const null_type &) const " -->
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<td class="memname">bool <a class="el" href="classmysqlpp_1_1Null.html">mysqlpp::Null</a>< Type, Behavior >::operator< </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classmysqlpp_1_1null__type.html">null_type</a> & </td>
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<td> ) </td>
<td width="100%"> const<code> [inline]</code></td>
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<p>
Do less-than comparison against hard-coded SQL null.
<p>
Always returns false because we can only be greater than or equal to a SQL null.
</div>
</div><p>
<a class="anchor" name="3f9fdc80890654486e8d1f321af9e962"></a><!-- doxytag: member="mysqlpp::Null::operator<" ref="3f9fdc80890654486e8d1f321af9e962" args="(const Null< Type > &rhs) const " -->
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<td class="memname">bool <a class="el" href="classmysqlpp_1_1Null.html">mysqlpp::Null</a>< Type, Behavior >::operator< </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classmysqlpp_1_1Null.html">Null</a>< Type > & </td>
<td class="paramname"> <em>rhs</em> </td>
<td> ) </td>
<td width="100%"> const<code> [inline]</code></td>
</tr>
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<div class="memdoc">
<p>
Do less-than comparison of two nullable values.
<p>
Two null objects are equal to each other, and null is less than not-null. If neither is null, we delegate to operator < for the base data type.
</div>
</div><p>
<a class="anchor" name="feeb2bf706bb7790a6f875783000bced"></a><!-- doxytag: member="mysqlpp::Null::operator=" ref="feeb2bf706bb7790a6f875783000bced" args="(const null_type &n)" -->
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<td class="paramname"> <em>n</em> </td>
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Assign SQL null to this object.
<p>
This just sets the is_null flag; the data member is not affected until you call the Type() operator on it.
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</div><p>
<a class="anchor" name="166ecaa4b711982efe2d8ceee57cd06a"></a><!-- doxytag: member="mysqlpp::Null::operator=" ref="166ecaa4b711982efe2d8ceee57cd06a" args="(const Type &x)" -->
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Assign a value to the object.
<p>
This marks the object as "not null" as a side effect.
</div>
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<a class="anchor" name="cc421c483f46260347daf6ab6a05d301"></a><!-- doxytag: member="mysqlpp::Null::operator==" ref="cc421c483f46260347daf6ab6a05d301" args="(const null_type &) const " -->
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<td>(</td>
<td class="paramtype">const <a class="el" href="classmysqlpp_1_1null__type.html">null_type</a> & </td>
<td class="paramname"> </td>
<td> ) </td>
<td width="100%"> const<code> [inline]</code></td>
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<p>
Do equality comparison against hard-coded SQL null.
<p>
This tells you the same thing as testing is_null member.
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<a class="anchor" name="cbc1510c2656a7bf6f09ede8080946c3"></a><!-- doxytag: member="mysqlpp::Null::operator==" ref="cbc1510c2656a7bf6f09ede8080946c3" args="(const Null< Type > &rhs) const " -->
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template<class Type, class Behavior = NullIsNull> </div>
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<td class="memname">bool <a class="el" href="classmysqlpp_1_1Null.html">mysqlpp::Null</a>< Type, Behavior >::operator== </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classmysqlpp_1_1Null.html">Null</a>< Type > & </td>
<td class="paramname"> <em>rhs</em> </td>
<td> ) </td>
<td width="100%"> const<code> [inline]</code></td>
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<p>
Do equality comparison of two nullable values.
<p>
Two null objects are equal, and null is not equal to not-null. If neither is null, we delegate to operator == for the base data type.
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<hr><h2>Member Data Documentation</h2>
<a class="anchor" name="2ce81045c6da00302bb3c998527aab7b"></a><!-- doxytag: member="mysqlpp::Null::is_null" ref="2ce81045c6da00302bb3c998527aab7b" args="" -->
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template<class Type, class Behavior = NullIsNull> </div>
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<td class="memname">bool <a class="el" href="classmysqlpp_1_1Null.html">mysqlpp::Null</a>< Type, Behavior >::<a class="el" href="classmysqlpp_1_1Null.html#2ce81045c6da00302bb3c998527aab7b">is_null</a> </td>
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If set, this object is considered equal to SQL null.
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This flag affects how the Type() and << operators work.
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<hr>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="null_8h-source.html">null.h</a></ul>
<hr size="1"><address style="align: right;"><small>Generated on Fri Feb 29 16:26:29 2008 for MySQL++ by
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.7 </small></address>
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