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<p>Shows how to extend WiredTiger with application-specific collations, extractors and cursor types.</p>
<div class="fragment"><div class="line"><span class="comment">/*-</span></div><div class="line"><span class="comment"> * Public Domain 2014-2019 MongoDB, Inc.</span></div><div class="line"><span class="comment"> * Public Domain 2008-2014 WiredTiger, Inc.</span></div><div class="line"><span class="comment"> *</span></div><div class="line"><span class="comment"> * This is free and unencumbered software released into the public domain.</span></div><div class="line"><span class="comment"> *</span></div><div class="line"><span class="comment"> * Anyone is free to copy, modify, publish, use, compile, sell, or</span></div><div class="line"><span class="comment"> * distribute this software, either in source code form or as a compiled</span></div><div class="line"><span class="comment"> * binary, for any purpose, commercial or non-commercial, and by any</span></div><div class="line"><span class="comment"> * means.</span></div><div class="line"><span class="comment"> *</span></div><div class="line"><span class="comment"> * In jurisdictions that recognize copyright laws, the author or authors</span></div><div class="line"><span class="comment"> * of this software dedicate any and all copyright interest in the</span></div><div class="line"><span class="comment"> * software to the public domain. We make this dedication for the benefit</span></div><div class="line"><span class="comment"> * of the public at large and to the detriment of our heirs and</span></div><div class="line"><span class="comment"> * successors. We intend this dedication to be an overt act of</span></div><div class="line"><span class="comment"> * relinquishment in perpetuity of all present and future rights to this</span></div><div class="line"><span class="comment"> * software under copyright law.</span></div><div class="line"><span class="comment"> *</span></div><div class="line"><span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,</span></div><div class="line"><span class="comment"> * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF</span></div><div class="line"><span class="comment"> * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.</span></div><div class="line"><span class="comment"> * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR</span></div><div class="line"><span class="comment"> * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,</span></div><div class="line"><span class="comment"> * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR</span></div><div class="line"><span class="comment"> * OTHER DEALINGS IN THE SOFTWARE.</span></div><div class="line"><span class="comment"> *</span></div><div class="line"><span class="comment"> * ex_extending.c</span></div><div class="line"><span class="comment"> * This is an example demonstrating ways to extend WiredTiger with</span></div><div class="line"><span class="comment"> * extractors, collators and loadable modules.</span></div><div class="line"><span class="comment"> */</span></div><div class="line"><span class="preprocessor">#include <test_util.h></span></div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *home;</div><div class="line"></div><div class="line"><span class="comment">/* A simple case insensitive comparator. */</span></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span></div><div class="line">__compare_nocase(</div><div class="line"> <a name="_a0"></a><a class="code" href="struct_w_t___c_o_l_l_a_t_o_r.html">WT_COLLATOR</a> *collator, <a name="_a1"></a><a class="code" href="struct_w_t___s_e_s_s_i_o_n.html">WT_SESSION</a> *session, <span class="keyword">const</span> <a name="_a2"></a><a class="code" href="group__wt.html#struct_w_t___i_t_e_m">WT_ITEM</a> *v1, <span class="keyword">const</span> <a class="code" href="group__wt.html#struct_w_t___i_t_e_m">WT_ITEM</a> *v2, <span class="keywordtype">int</span> *cmp)</div><div class="line">{</div><div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *s1 = (<span class="keyword">const</span> <span class="keywordtype">char</span> *)v1-><a name="a3"></a><a class="code" href="group__wt.html#a57f5e62aa968275d7e398cfa70e49450">data</a>;</div><div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *s2 = (<span class="keyword">const</span> <span class="keywordtype">char</span> *)v2-><a class="code" href="group__wt.html#a57f5e62aa968275d7e398cfa70e49450">data</a>;</div><div class="line"></div><div class="line"> (void)session; <span class="comment">/* unused variable */</span></div><div class="line"> (void)collator; <span class="comment">/* unused variable */</span></div><div class="line"></div><div class="line"> *cmp = strcasecmp(s1, s2);</div><div class="line"> <span class="keywordflow">return</span> (0);</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> <a class="code" href="struct_w_t___c_o_l_l_a_t_o_r.html">WT_COLLATOR</a> nocasecoll = {__compare_nocase, NULL, NULL};</div><div class="line"><span class="comment">/*</span></div><div class="line"><span class="comment"> * Comparator that only compares the first N prefix characters of the string. This has associated</span></div><div class="line"><span class="comment"> * data, so we need to extend WT_COLLATOR.</span></div><div class="line"><span class="comment"> */</span></div><div class="line"><span class="keyword">typedef</span> <span class="keyword">struct </span>{</div><div class="line"> <a class="code" href="struct_w_t___c_o_l_l_a_t_o_r.html">WT_COLLATOR</a> iface;</div><div class="line"> uint32_t maxlen;</div><div class="line">} PREFIX_COLLATOR;</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span></div><div class="line">__compare_prefixes(</div><div class="line"> <a class="code" href="struct_w_t___c_o_l_l_a_t_o_r.html">WT_COLLATOR</a> *collator, <a class="code" href="struct_w_t___s_e_s_s_i_o_n.html">WT_SESSION</a> *session, <span class="keyword">const</span> <a class="code" href="group__wt.html#struct_w_t___i_t_e_m">WT_ITEM</a> *v1, <span class="keyword">const</span> <a class="code" href="group__wt.html#struct_w_t___i_t_e_m">WT_ITEM</a> *v2, <span class="keywordtype">int</span> *cmp)</div><div class="line">{</div><div class="line"> PREFIX_COLLATOR *pcoll = (PREFIX_COLLATOR *)collator;</div><div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *s1 = (<span class="keyword">const</span> <span class="keywordtype">char</span> *)v1-><a class="code" href="group__wt.html#a57f5e62aa968275d7e398cfa70e49450">data</a>;</div><div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *s2 = (<span class="keyword">const</span> <span class="keywordtype">char</span> *)v2-><a class="code" href="group__wt.html#a57f5e62aa968275d7e398cfa70e49450">data</a>;</div><div class="line"></div><div class="line"> (void)session; <span class="comment">/* unused */</span></div><div class="line"></div><div class="line"> *cmp = strncmp(s1, s2, pcoll->maxlen);</div><div class="line"> <span class="keywordflow">return</span> (0);</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> PREFIX_COLLATOR pcoll10 = {{__compare_prefixes, NULL, NULL}, 10};</div><div class="line"><span class="keywordtype">int</span></div><div class="line">main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> *argv[])</div><div class="line">{</div><div class="line"> <a name="_a4"></a><a class="code" href="struct_w_t___c_o_n_n_e_c_t_i_o_n.html">WT_CONNECTION</a> *conn;</div><div class="line"> <a class="code" href="struct_w_t___s_e_s_s_i_o_n.html">WT_SESSION</a> *session;</div><div class="line"></div><div class="line"> home = example_setup(argc, argv);</div><div class="line"></div><div class="line"> <span class="comment">/* Open a connection to the database, creating it if necessary. */</span></div><div class="line"> error_check(<a name="a5"></a><a class="code" href="group__wt.html#gacbe8d118f978f5bfc8ccb4c77c9e8813">wiredtiger_open</a>(home, NULL, <span class="stringliteral">"create"</span>, &conn));</div><div class="line"></div><div class="line"> error_check(conn-><a name="a6"></a><a class="code" href="struct_w_t___c_o_n_n_e_c_t_i_o_n.html#a89290382c55f20e5a4e1bc9216c7a8c8">add_collator</a>(conn, <span class="stringliteral">"nocase"</span>, &nocasecoll, NULL));</div><div class="line"> error_check(conn-><a class="code" href="struct_w_t___c_o_n_n_e_c_t_i_o_n.html#a89290382c55f20e5a4e1bc9216c7a8c8">add_collator</a>(conn, <span class="stringliteral">"prefix10"</span>, &pcoll10.iface, NULL));</div><div class="line"></div><div class="line"> <span class="comment">/* Open a session for the current thread's work. */</span></div><div class="line"> error_check(conn-><a name="a7"></a><a class="code" href="struct_w_t___c_o_n_n_e_c_t_i_o_n.html#adad5965cd4a60f65b5ac01f7ca6d1fc0">open_session</a>(conn, NULL, NULL, &session));</div><div class="line"></div><div class="line"> <span class="comment">/* Do some work... */</span></div><div class="line"></div><div class="line"> error_check(conn-><a name="a8"></a><a class="code" href="struct_w_t___c_o_n_n_e_c_t_i_o_n.html#af535c517df851eeac8ebf3594d40b545">close</a>(conn, NULL));</div><div class="line"> <span class="keywordflow">return</span> (EXIT_SUCCESS);</div><div class="line">}</div></div><!-- fragment --> </div><!-- contents -->
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