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<div class="title">insertpolicy.h</div> </div>
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<a href="insertpolicy_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="l00032"></a><span class="lineno"> 32</span> <span class="comment">/***********************************************************************</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> Copyright © 2008-2009 by AboveNet, Inc., and © 2009 by Educational</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> Technology Resources, Inc. Others may also hold copyrights on code</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> in this file. See the CREDITS file in the top directory of the</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> distribution for details.</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"></span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"> This file is part of MySQL++.</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"></span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> MySQL++ is free software; you can redistribute it and/or modify it</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> under the terms of the GNU Lesser General Public License as published</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> by the Free Software Foundation; either version 2.1 of the License, or</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> (at your option) any later version.</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"></span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"> MySQL++ is distributed in the hope that it will be useful, but WITHOUT</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"> ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"> FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment"> License for more details.</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"></span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"> You should have received a copy of the GNU Lesser General Public</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> License along with MySQL++; if not, write to the Free Software</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment"> Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment"> USA</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment">***********************************************************************/</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="preprocessor">#if !defined(MYSQLPP_INSERTPOLICY_H)</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="preprocessor"></span><span class="preprocessor">#define MYSQLPP_INSERTPOLICY_H</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment">// Only allow these templates to be defined if they're being bodily</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment">// included into class Query's definition. They're in this separate</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment">// file only for claity, so they don't get lost among the other</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment">// definitions in class Query. Without this, Doxygen will pick them</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment">// up and treat them as a) outside namespace mysqlpp; and b) not member</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment">// templates of class Query. We also don't want end-users of the</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment">// library to #include this file in their own code; these templates</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment">// should only be used as mysqlpp::Query::*.</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="preprocessor">#if defined(MYSQLPP_DEFINE_INSERT_POLICY_TEMPLATES)</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="keyword">template</span> <<span class="keyword">class</span> AccessController = Transaction></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="keyword">class </span>MYSQLPP_EXPORT RowCountInsertPolicy</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> {</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="keyword">public</span>:</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  RowCountInsertPolicy(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> rows) :</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  cur_rows_(0),</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  max_rows_(rows)</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  {</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="l00088"></a><span class="lineno"> 88</span>  ~RowCountInsertPolicy() { }</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> </div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keyword">template</span> <<span class="keyword">class</span> RowT></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordtype">bool</span> can_add(<span class="keywordtype">int</span>, <span class="keyword">const</span> RowT&)</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  {</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keywordflow">if</span> (++cur_rows_ > max_rows_) {</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  cur_rows_ = 0;</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  }</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  }</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> </div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keyword">typedef</span> AccessController access_controller;</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> </div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="keyword">private</span>:</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> cur_rows_;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordtype">unsigned</span> <span class="keyword">const</span> <span class="keywordtype">int</span> max_rows_;</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> };</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> </div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> </div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> <span class="keyword">template</span> <<span class="keyword">class</span> AccessController = Transaction></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="keyword">class </span>MYSQLPP_EXPORT SizeThresholdInsertPolicy</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> {</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="keyword">public</span>:</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  SizeThresholdInsertPolicy(<span class="keywordtype">int</span> size) :</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  size_(size)</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  {</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  }</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> </div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  ~SizeThresholdInsertPolicy() { }</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> </div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="keyword">template</span> <<span class="keyword">class</span> RowT></div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="keywordtype">bool</span> can_add(<span class="keywordtype">int</span> size, <span class="keyword">const</span> RowT& <span class="keywordtype">object</span>)<span class="keyword"> const</span></div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> <span class="keyword"> </span>{</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="keywordflow">return</span> (size < size_);</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  }</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span> </div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="keyword">typedef</span> AccessController access_controller;</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> </div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="keyword">private</span>:</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="keywordtype">int</span> size_;</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span> };</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> </div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> </div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span> <span class="keyword">template</span> <<span class="keyword">class</span> AccessController = Transaction></div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> <span class="keyword">class </span>MYSQLPP_EXPORT MaxPacketInsertPolicy</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span> {</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span> <span class="keyword">public</span>:</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  MaxPacketInsertPolicy(Connection* con, <span class="keywordtype">int</span> size) :</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  conn_(con), size_(size)</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  {</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  }</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span> </div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  MaxPacketInsertPolicy(<span class="keywordtype">int</span> size) :</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  conn_(0), size_(size)</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  {</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  }</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> </div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  ~MaxPacketInsertPolicy() { }</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span> </div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  <span class="keyword">template</span> <<span class="keyword">class</span> RowT></div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="keywordtype">bool</span> can_add(<span class="keywordtype">int</span> size, <span class="keyword">const</span> RowT& <span class="keywordtype">object</span>)<span class="keyword"> const</span></div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span> <span class="keyword"> </span>{</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keywordflow">if</span> (size < size_) {</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="comment">// Haven't hit size threshold yet, so see if this next</span></div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  <span class="comment">// item pushes it over the line.</span></div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  SQLStream s(conn_);</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  s << <span class="stringliteral">",("</span> << <span class="keywordtype">object</span>.value_list() << <span class="stringliteral">")"</span>;</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  <span class="keywordflow">return</span> (size_ - size) >= <span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(s.str().size());</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  }</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <span class="comment">// Already too much in query buffer!</span></div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  }</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  }</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span> </div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  <span class="keyword">typedef</span> AccessController access_controller;</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span> </div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span> <span class="keyword">private</span>:</div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  Connection* conn_;</div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  <span class="keywordtype">int</span> size_;</div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span> };</div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span> </div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span> <span class="preprocessor">#endif // defined(MYSQLPP_DEFINE_INSERT_POLICY_TEMPLATES)</span></div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span> <span class="preprocessor">#endif // !defined(MYSQLPP_INSERTPOLICY_H)</span></div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span> <span class="preprocessor"></span></div>
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