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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<div class="title">null.h</div> </div>
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<div class="contents">
<a href="null_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> </div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">/***********************************************************************</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> Copyright (c) 1998 by Kevin Atkinson, (c) 1999-2001 by MySQL AB, and</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> (c) 2004-2008 by Educational Technology Resources, Inc. Others may</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> also hold copyrights on code in this file. See the CREDITS.txt file</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> in the top directory of the distribution for details.</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"></span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> This file is part of MySQL++.</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"></span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> MySQL++ is free software; you can redistribute it and/or modify it</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> under the terms of the GNU Lesser General Public License as published</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> by the Free Software Foundation; either version 2.1 of the License, or</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> (at your option) any later version.</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"></span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> MySQL++ is distributed in the hope that it will be useful, but WITHOUT</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> License for more details.</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"></span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> You should have received a copy of the GNU Lesser General Public</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> License along with MySQL++; if not, write to the Free Software</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> USA</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">***********************************************************************/</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor">#ifndef MYSQLPP_NULL_H</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="preprocessor"></span><span class="preprocessor">#define MYSQLPP_NULL_H</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="preprocessor">#include "<a class="code" href="exceptions_8h.html">exceptions.h</a>"</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> </div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="preprocessor">#include <iostream></span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="preprocessor">#include <string></span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> </div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="keyword">namespace </span>mysqlpp {</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> </div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="keyword">extern</span> <span class="keyword">const</span> std::string null_str; </div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> </div>
<div class="line"><a name="l00049"></a><span class="lineno"><a class="line" href="classmysqlpp_1_1null__type.html"> 49</a></span> <span class="keyword">class </span>MYSQLPP_EXPORT <a class="code" href="classmysqlpp_1_1null__type.html">null_type</a></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> {</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="keyword">protected</span>:</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="preprocessor">#if !defined(DOXYGEN_IGNORE)</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="preprocessor"></span><span class="comment">// Doxygen will not generate documentation for this section.</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> CannotConvertNullToAnyOtherDataType></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keyword">operator</span> CannotConvertNullToAnyOtherDataType()<span class="keyword"> const</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="keyword"> </span>{</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordflow">return</span> CannotConvertNullToAnyOtherDataType();</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  }</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="preprocessor">#endif // !defined(DOXYGEN_IGNORE)</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="preprocessor"></span>};</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> </div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="keyword">const</span> <a class="code" href="classmysqlpp_1_1null__type.html">null_type</a> null = <a class="code" href="classmysqlpp_1_1null__type.html">null_type</a>();</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> </div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> </div>
<div class="line"><a name="l00094"></a><span class="lineno"><a class="line" href="structmysqlpp_1_1NullIsNull.html"> 94</a></span> <span class="keyword">struct </span><a class="code" href="structmysqlpp_1_1NullIsNull.html">NullIsNull</a></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> {</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="preprocessor">#if !defined(DOXYGEN_IGNORE)</span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="preprocessor"></span><span class="comment">// Doxygen will not generate documentation for this section.</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keyword">static</span> <a class="code" href="classmysqlpp_1_1null__type.html">null_type</a> null_is() { <span class="keywordflow">return</span> null; }</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> </div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keyword">static</span> std::ostream& null_ostr(std::ostream& o)</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  {</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  o << <span class="stringliteral">"(NULL)"</span>;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keywordflow">return</span> o;</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  }</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="preprocessor">#endif // !defined(DOXYGEN_IGNORE)</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="preprocessor"></span>};</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> </div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> </div>
<div class="line"><a name="l00115"></a><span class="lineno"><a class="line" href="structmysqlpp_1_1NullIsZero.html"> 115</a></span> <span class="keyword">struct </span><a class="code" href="structmysqlpp_1_1NullIsZero.html">NullIsZero</a></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> {</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="preprocessor">#if !defined(DOXYGEN_IGNORE)</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="preprocessor"></span><span class="comment">// Doxygen will not generate documentation for this section.</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keyword">static</span> <span class="keywordtype">int</span> null_is() { <span class="keywordflow">return</span> 0; }</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  </div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keyword">static</span> std::ostream& null_ostr(std::ostream& o)</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  {</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  o << 0;</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keywordflow">return</span> o;</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  }</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="preprocessor">#endif // !defined(DOXYGEN_IGNORE)</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> <span class="preprocessor"></span>};</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> </div>
<div class="line"><a name="l00135"></a><span class="lineno"><a class="line" href="structmysqlpp_1_1NullIsBlank.html"> 135</a></span> <span class="keyword">struct </span><a class="code" href="structmysqlpp_1_1NullIsBlank.html">NullIsBlank</a></div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> {</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="preprocessor">#if !defined(DOXYGEN_IGNORE)</span></div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="preprocessor"></span><span class="comment">// Doxygen will not generate documentation for this section.</span></div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *null_is() { <span class="keywordflow">return</span> <span class="stringliteral">""</span>; }</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  </div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="keyword">static</span> std::ostream& null_ostr(std::ostream& o)</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  {</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  o << <span class="stringliteral">""</span>;</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <span class="keywordflow">return</span> o;</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  }</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> <span class="preprocessor">#endif // !defined(DOXYGEN_IGNORE)</span></div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="preprocessor"></span>};</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> </div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span> </div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span> <span class="keyword">template</span> <<span class="keyword">class</span> Type, <span class="keyword">class</span> Behavior = NullIsNull></div>
<div class="line"><a name="l00170"></a><span class="lineno"><a class="line" href="classmysqlpp_1_1Null.html"> 170</a></span> <span class="keyword">class </span><a class="code" href="classmysqlpp_1_1Null.html">Null</a></div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span> {</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span> <span class="keyword">public</span>:</div>
<div class="line"><a name="l00174"></a><span class="lineno"><a class="line" href="classmysqlpp_1_1Null.html#a11c562b34e0f4f39f34cd36ace40c33e"> 174</a></span>  Type <a class="code" href="classmysqlpp_1_1Null.html#a11c562b34e0f4f39f34cd36ace40c33e">data</a>;</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  </div>
<div class="line"><a name="l00179"></a><span class="lineno"><a class="line" href="classmysqlpp_1_1Null.html#a2ce81045c6da00302bb3c998527aab7b"> 179</a></span>  <span class="keywordtype">bool</span> <a class="code" href="classmysqlpp_1_1Null.html#a2ce81045c6da00302bb3c998527aab7b">is_null</a>;</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> </div>
<div class="line"><a name="l00183"></a><span class="lineno"><a class="line" href="classmysqlpp_1_1Null.html#aca01e95f7308d0601463e941857245ac"> 183</a></span>  <span class="keyword">typedef</span> Type <a class="code" href="classmysqlpp_1_1Null.html#aca01e95f7308d0601463e941857245ac">value_type</a>;</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span> </div>
<div class="line"><a name="l00189"></a><span class="lineno"><a class="line" href="classmysqlpp_1_1Null.html#aa776139d049ac32aa7850ecd5e623b8f"> 189</a></span>  <a class="code" href="classmysqlpp_1_1Null.html#aa776139d049ac32aa7850ecd5e623b8f">Null</a>() :</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  <a class="code" href="classmysqlpp_1_1Null.html#a11c562b34e0f4f39f34cd36ace40c33e">data</a>(),</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  <a class="code" href="classmysqlpp_1_1Null.html#a2ce81045c6da00302bb3c998527aab7b">is_null</a>(false)</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  {</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  }</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span> </div>
<div class="line"><a name="l00202"></a><span class="lineno"><a class="line" href="classmysqlpp_1_1Null.html#a738398c6aa00bd5a4d691f6277e453ca"> 202</a></span>  <a class="code" href="classmysqlpp_1_1Null.html#a738398c6aa00bd5a4d691f6277e453ca">Null</a>(<span class="keyword">const</span> Type& x) :</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <a class="code" href="classmysqlpp_1_1Null.html#a11c562b34e0f4f39f34cd36ace40c33e">data</a>(x),</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <a class="code" href="classmysqlpp_1_1Null.html#a2ce81045c6da00302bb3c998527aab7b">is_null</a>(false)</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  {</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  }</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span> </div>
<div class="line"><a name="l00216"></a><span class="lineno"><a class="line" href="classmysqlpp_1_1Null.html#ab04ae6dc7e0e4ad80021014a6e241b67"> 216</a></span>  <a class="code" href="classmysqlpp_1_1Null.html#ab04ae6dc7e0e4ad80021014a6e241b67">Null</a>(<span class="keyword">const</span> <a class="code" href="classmysqlpp_1_1null__type.html">null_type</a>&) :</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  <a class="code" href="classmysqlpp_1_1Null.html#a11c562b34e0f4f39f34cd36ace40c33e">data</a>(),</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  <a class="code" href="classmysqlpp_1_1Null.html#a2ce81045c6da00302bb3c998527aab7b">is_null</a>(true)</div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  {</div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  }</div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span> </div>
<div class="line"><a name="l00229"></a><span class="lineno"><a class="line" href="classmysqlpp_1_1Null.html#a6ccb0aa0c8fdc6d4bf23ed9fdfa82840"> 229</a></span>  <span class="keyword">operator</span> Type()<span class="keyword"> const</span></div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span> <span class="keyword"> </span>{</div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  <span class="keywordflow">if</span> (<a class="code" href="classmysqlpp_1_1Null.html#a2ce81045c6da00302bb3c998527aab7b">is_null</a>) {</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  <span class="keywordflow">return</span> Behavior::null_is();</div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  }</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  <span class="keywordflow">return</span> <a class="code" href="classmysqlpp_1_1Null.html#a11c562b34e0f4f39f34cd36ace40c33e">data</a>;</div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  }</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  }</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span> </div>
<div class="line"><a name="l00242"></a><span class="lineno"><a class="line" href="classmysqlpp_1_1Null.html#a166ecaa4b711982efe2d8ceee57cd06a"> 242</a></span>  <a class="code" href="classmysqlpp_1_1Null.html">Null</a>& <a class="code" href="classmysqlpp_1_1Null.html#a166ecaa4b711982efe2d8ceee57cd06a">operator =</a>(<span class="keyword">const</span> Type& x)</div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  {</div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  <a class="code" href="classmysqlpp_1_1Null.html#a11c562b34e0f4f39f34cd36ace40c33e">data</a> = x;</div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <a class="code" href="classmysqlpp_1_1Null.html#a2ce81045c6da00302bb3c998527aab7b">is_null</a> = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  }</div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span> </div>
<div class="line"><a name="l00253"></a><span class="lineno"><a class="line" href="classmysqlpp_1_1Null.html#a05b4d11b4ac5bfa80c2a05cbcc740d01"> 253</a></span>  <a class="code" href="classmysqlpp_1_1Null.html">Null</a>& <a class="code" href="classmysqlpp_1_1Null.html#a166ecaa4b711982efe2d8ceee57cd06a">operator =</a>(<span class="keyword">const</span> <a class="code" href="classmysqlpp_1_1null__type.html">null_type</a>&)</div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  {</div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  <a class="code" href="classmysqlpp_1_1Null.html#a2ce81045c6da00302bb3c998527aab7b">is_null</a> = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  }</div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span> </div>
<div class="line"><a name="l00264"></a><span class="lineno"><a class="line" href="classmysqlpp_1_1Null.html#acbc1510c2656a7bf6f09ede8080946c3"> 264</a></span>  <span class="keywordtype">bool</span> <a class="code" href="classmysqlpp_1_1Null.html#acbc1510c2656a7bf6f09ede8080946c3">operator ==</a>(<span class="keyword">const</span> <a class="code" href="classmysqlpp_1_1Null.html">Null<Type></a>& rhs)<span class="keyword"> const</span></div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span> <span class="keyword"> </span>{</div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  <span class="keywordflow">if</span> (<a class="code" href="classmysqlpp_1_1Null.html#a2ce81045c6da00302bb3c998527aab7b">is_null</a> && rhs.<a class="code" href="classmysqlpp_1_1Null.html#a2ce81045c6da00302bb3c998527aab7b">is_null</a>) {</div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  }</div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (<a class="code" href="classmysqlpp_1_1Null.html#a2ce81045c6da00302bb3c998527aab7b">is_null</a> != rhs.<a class="code" href="classmysqlpp_1_1Null.html#a2ce81045c6da00302bb3c998527aab7b">is_null</a>) {</div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>; <span class="comment">// one null, the other not</span></div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  }</div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <span class="keywordflow">return</span> <a class="code" href="classmysqlpp_1_1Null.html#a11c562b34e0f4f39f34cd36ace40c33e">data</a> == rhs.<a class="code" href="classmysqlpp_1_1Null.html#a11c562b34e0f4f39f34cd36ace40c33e">data</a>;</div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  }</div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  }</div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span> </div>
<div class="line"><a name="l00280"></a><span class="lineno"><a class="line" href="classmysqlpp_1_1Null.html#acc421c483f46260347daf6ab6a05d301"> 280</a></span>  <span class="keywordtype">bool</span> <a class="code" href="classmysqlpp_1_1Null.html#acbc1510c2656a7bf6f09ede8080946c3">operator ==</a>(<span class="keyword">const</span> <a class="code" href="classmysqlpp_1_1null__type.html">null_type</a>&)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <a class="code" href="classmysqlpp_1_1Null.html#a2ce81045c6da00302bb3c998527aab7b">is_null</a>; }</div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span> </div>
<div class="line"><a name="l00283"></a><span class="lineno"><a class="line" href="classmysqlpp_1_1Null.html#ae6a5550e3c7c388b558a737b50c7d903"> 283</a></span>  <span class="keywordtype">bool</span> <a class="code" href="classmysqlpp_1_1Null.html#ae6a5550e3c7c388b558a737b50c7d903">operator !=</a>(<span class="keyword">const</span> <a class="code" href="classmysqlpp_1_1Null.html">Null<Type></a>& rhs)<span class="keyword"> const</span></div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span> <span class="keyword"> </span>{ <span class="keywordflow">return</span> !(*<span class="keyword">this</span> == rhs); }</div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span> </div>
<div class="line"><a name="l00287"></a><span class="lineno"><a class="line" href="classmysqlpp_1_1Null.html#ae15fb952f10e58d7c310878c479a593e"> 287</a></span>  <span class="keywordtype">bool</span> <a class="code" href="classmysqlpp_1_1Null.html#ae6a5550e3c7c388b558a737b50c7d903">operator !=</a>(<span class="keyword">const</span> <a class="code" href="classmysqlpp_1_1null__type.html">null_type</a>& rhs)<span class="keyword"> const</span></div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span> <span class="keyword"> </span>{ <span class="keywordflow">return</span> !(*<span class="keyword">this</span> == rhs); }</div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span> </div>
<div class="line"><a name="l00295"></a><span class="lineno"><a class="line" href="classmysqlpp_1_1Null.html#a3f9fdc80890654486e8d1f321af9e962"> 295</a></span>  <span class="keywordtype">bool</span> operator <(const Null<Type>& rhs) <span class="keyword">const</span></div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  {</div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  <span class="keywordflow">if</span> (<a class="code" href="classmysqlpp_1_1Null.html#a2ce81045c6da00302bb3c998527aab7b">is_null</a>) {</div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  <span class="keywordflow">return</span> !rhs.is_null; <span class="comment">// less than only if RHS not null</span></div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  }</div>
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (rhs.is_null) {</div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>; <span class="comment">// non-null always greater than null</span></div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  }</div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  <span class="keywordflow">return</span> <a class="code" href="classmysqlpp_1_1Null.html#a11c562b34e0f4f39f34cd36ace40c33e">data</a> < rhs.data; <span class="comment">// neither is null, so compare data</span></div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  }</div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  }</div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span> </div>
<div class="line"><a name="l00312"></a><span class="lineno"><a class="line" href="classmysqlpp_1_1Null.html#a6d446e98902211c226ae23a3cc13f4a6"> 312</a></span>  <span class="keywordtype">bool</span> <a class="code" href="classmysqlpp_1_1Null.html#a3f9fdc80890654486e8d1f321af9e962">operator <</a>(<span class="keyword">const</span> <a class="code" href="classmysqlpp_1_1null__type.html">null_type</a>&)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> <span class="keyword">false</span>; }</div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span> };</div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span> </div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span> </div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span> <span class="preprocessor">#if !defined(DOXYGEN_IGNORE)</span></div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span> <span class="preprocessor"></span><span class="comment">// Doxygen will not generate documentation for this section.</span></div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span> </div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span> <span class="comment">// Specialization the Null template for \c void</span></div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span> <span class="keyword">template</span> <> <span class="keyword">class </span>Null<void></div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span> {</div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span> <span class="keyword">public</span>:</div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  <span class="keywordtype">bool</span> <a class="code" href="classmysqlpp_1_1Null.html#a2ce81045c6da00302bb3c998527aab7b">is_null</a>;</div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  <span class="keyword">typedef</span> <span class="keywordtype">void</span> <a class="code" href="classmysqlpp_1_1Null.html#aca01e95f7308d0601463e941857245ac">value_type</a>;</div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span> </div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  <a class="code" href="classmysqlpp_1_1Null.html#aa776139d049ac32aa7850ecd5e623b8f">Null</a>() :</div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  <a class="code" href="classmysqlpp_1_1Null.html#a2ce81045c6da00302bb3c998527aab7b">is_null</a>(false)</div>
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  {</div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  }</div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span>  </div>
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  <a class="code" href="classmysqlpp_1_1Null.html#aa776139d049ac32aa7850ecd5e623b8f">Null</a>(<span class="keyword">const</span> null_type&) :</div>
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span>  <a class="code" href="classmysqlpp_1_1Null.html#a2ce81045c6da00302bb3c998527aab7b">is_null</a>(true)</div>
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  {</div>
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  }</div>
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span> </div>
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  <a class="code" href="classmysqlpp_1_1Null.html#aa776139d049ac32aa7850ecd5e623b8f">Null</a>& <a class="code" href="classmysqlpp_1_1Null.html#a166ecaa4b711982efe2d8ceee57cd06a">operator =</a>(<span class="keyword">const</span> null_type&)</div>
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  {</div>
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  <a class="code" href="classmysqlpp_1_1Null.html#a2ce81045c6da00302bb3c998527aab7b">is_null</a> = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div>
<div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  }</div>
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span> };</div>
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span> </div>
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span> <span class="preprocessor">#endif // !defined(DOXYGEN_IGNORE)</span></div>
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span> </div>
<div class="line"><a name="l00349"></a><span class="lineno"> 349</span> <span class="keyword">template</span> <<span class="keyword">class</span> Type, <span class="keyword">class</span> Behavior></div>
<div class="line"><a name="l00350"></a><span class="lineno"> 350</span> <span class="keyword">inline</span> std::ostream& operator <<(std::ostream& o,</div>
<div class="line"><a name="l00351"></a><span class="lineno"> 351</span>  <span class="keyword">const</span> Null<Type, Behavior>& n)</div>
<div class="line"><a name="l00352"></a><span class="lineno"> 352</span> {</div>
<div class="line"><a name="l00353"></a><span class="lineno"> 353</span>  <span class="keywordflow">if</span> (n.is_null)</div>
<div class="line"><a name="l00354"></a><span class="lineno"> 354</span>  <span class="keywordflow">return</span> Behavior::null_ostr(o);</div>
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00356"></a><span class="lineno"> 356</span>  <span class="keywordflow">return</span> o << n.data;</div>
<div class="line"><a name="l00357"></a><span class="lineno"> 357</span> }</div>
<div class="line"><a name="l00358"></a><span class="lineno"> 358</span> </div>
<div class="line"><a name="l00359"></a><span class="lineno"> 359</span> } <span class="comment">// end namespace mysqlpp</span></div>
<div class="line"><a name="l00360"></a><span class="lineno"> 360</span> </div>
<div class="line"><a name="l00361"></a><span class="lineno"> 361</span> <span class="preprocessor">#endif</span></div>
<div class="ttc" id="classmysqlpp_1_1Null_html_acbc1510c2656a7bf6f09ede8080946c3"><div class="ttname"><a href="classmysqlpp_1_1Null.html#acbc1510c2656a7bf6f09ede8080946c3">mysqlpp::Null::operator==</a></div><div class="ttdeci">bool operator==(const Null< Type > &rhs) const </div><div class="ttdoc">Do equality comparison of two nullable values. </div><div class="ttdef"><b>Definition:</b> null.h:264</div></div>
<div class="ttc" id="classmysqlpp_1_1Null_html_aca01e95f7308d0601463e941857245ac"><div class="ttname"><a href="classmysqlpp_1_1Null.html#aca01e95f7308d0601463e941857245ac">mysqlpp::Null::value_type</a></div><div class="ttdeci">Type value_type</div><div class="ttdoc">Type of the data stored in this object, when it is not equal to SQL null. </div><div class="ttdef"><b>Definition:</b> null.h:183</div></div>
<div class="ttc" id="classmysqlpp_1_1Null_html_a3f9fdc80890654486e8d1f321af9e962"><div class="ttname"><a href="classmysqlpp_1_1Null.html#a3f9fdc80890654486e8d1f321af9e962">mysqlpp::Null::operator<</a></div><div class="ttdeci">bool operator<(const Null< Type > &rhs) const </div><div class="ttdoc">Do less-than comparison of two nullable values. </div><div class="ttdef"><b>Definition:</b> null.h:295</div></div>
<div class="ttc" id="classmysqlpp_1_1Null_html_ab04ae6dc7e0e4ad80021014a6e241b67"><div class="ttname"><a href="classmysqlpp_1_1Null.html#ab04ae6dc7e0e4ad80021014a6e241b67">mysqlpp::Null::Null</a></div><div class="ttdeci">Null(const null_type &)</div><div class="ttdoc">Construct a Null equal to SQL null. </div><div class="ttdef"><b>Definition:</b> null.h:216</div></div>
<div class="ttc" id="classmysqlpp_1_1Null_html_a738398c6aa00bd5a4d691f6277e453ca"><div class="ttname"><a href="classmysqlpp_1_1Null.html#a738398c6aa00bd5a4d691f6277e453ca">mysqlpp::Null::Null</a></div><div class="ttdeci">Null(const Type &x)</div><div class="ttdoc">Initialize the object with a particular value. </div><div class="ttdef"><b>Definition:</b> null.h:202</div></div>
<div class="ttc" id="structmysqlpp_1_1NullIsZero_html"><div class="ttname"><a href="structmysqlpp_1_1NullIsZero.html">mysqlpp::NullIsZero</a></div><div class="ttdoc">Class for objects that define SQL null as 0. </div><div class="ttdef"><b>Definition:</b> null.h:115</div></div>
<div class="ttc" id="structmysqlpp_1_1NullIsBlank_html"><div class="ttname"><a href="structmysqlpp_1_1NullIsBlank.html">mysqlpp::NullIsBlank</a></div><div class="ttdoc">Class for objects that define SQL null as a blank C string. </div><div class="ttdef"><b>Definition:</b> null.h:135</div></div>
<div class="ttc" id="classmysqlpp_1_1null__type_html"><div class="ttname"><a href="classmysqlpp_1_1null__type.html">mysqlpp::null_type</a></div><div class="ttdoc">The type of the global mysqlpp::null object. </div><div class="ttdef"><b>Definition:</b> null.h:49</div></div>
<div class="ttc" id="exceptions_8h_html"><div class="ttname"><a href="exceptions_8h.html">exceptions.h</a></div><div class="ttdoc">Declares the MySQL++-specific exception classes. </div></div>
<div class="ttc" id="classmysqlpp_1_1Null_html_a11c562b34e0f4f39f34cd36ace40c33e"><div class="ttname"><a href="classmysqlpp_1_1Null.html#a11c562b34e0f4f39f34cd36ace40c33e">mysqlpp::Null::data</a></div><div class="ttdeci">Type data</div><div class="ttdoc">The object&#39;s value, when it is not SQL null. </div><div class="ttdef"><b>Definition:</b> null.h:174</div></div>
<div class="ttc" id="classmysqlpp_1_1Null_html_aa776139d049ac32aa7850ecd5e623b8f"><div class="ttname"><a href="classmysqlpp_1_1Null.html#aa776139d049ac32aa7850ecd5e623b8f">mysqlpp::Null::Null</a></div><div class="ttdeci">Null()</div><div class="ttdoc">Default constructor. </div><div class="ttdef"><b>Definition:</b> null.h:189</div></div>
<div class="ttc" id="classmysqlpp_1_1Null_html_a166ecaa4b711982efe2d8ceee57cd06a"><div class="ttname"><a href="classmysqlpp_1_1Null.html#a166ecaa4b711982efe2d8ceee57cd06a">mysqlpp::Null::operator=</a></div><div class="ttdeci">Null & operator=(const Type &x)</div><div class="ttdoc">Assign a value to the object. </div><div class="ttdef"><b>Definition:</b> null.h:242</div></div>
<div class="ttc" id="classmysqlpp_1_1Null_html_ae6a5550e3c7c388b558a737b50c7d903"><div class="ttname"><a href="classmysqlpp_1_1Null.html#ae6a5550e3c7c388b558a737b50c7d903">mysqlpp::Null::operator!=</a></div><div class="ttdeci">bool operator!=(const Null< Type > &rhs) const </div><div class="ttdoc">Do inequality comparison of two nullable values. </div><div class="ttdef"><b>Definition:</b> null.h:283</div></div>
<div class="ttc" id="classmysqlpp_1_1Null_html_a2ce81045c6da00302bb3c998527aab7b"><div class="ttname"><a href="classmysqlpp_1_1Null.html#a2ce81045c6da00302bb3c998527aab7b">mysqlpp::Null::is_null</a></div><div class="ttdeci">bool is_null</div><div class="ttdoc">If set, this object is considered equal to SQL null. </div><div class="ttdef"><b>Definition:</b> null.h:179</div></div>
<div class="ttc" id="classmysqlpp_1_1Null_html"><div class="ttname"><a href="classmysqlpp_1_1Null.html">mysqlpp::Null</a></div><div class="ttdoc">Class for holding data from a SQL column with the NULL attribute. </div><div class="ttdef"><b>Definition:</b> null.h:170</div></div>
<div class="ttc" id="structmysqlpp_1_1NullIsNull_html"><div class="ttname"><a href="structmysqlpp_1_1NullIsNull.html">mysqlpp::NullIsNull</a></div><div class="ttdoc">Class for objects that define SQL null in terms of MySQL++&#39;s null_type. </div><div class="ttdef"><b>Definition:</b> null.h:94</div></div>
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</a> 1.8.5
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