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<p>Shows how to extend WiredTiger with a more complex custom extractor.</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_extractor.c</span></div><div class="line"><span class="comment"> * Example of how to use a WiredTiger custom index extractor extension.</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="keyword">struct </span>president_data {</div><div class="line"> <span class="keywordtype">int</span> id;</div><div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *last_name;</div><div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *first_name;</div><div class="line"> uint16_t term_start;</div><div class="line"> uint16_t term_end;</div><div class="line">};</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">struct </span>president_data example_data[] = {{0, <span class="stringliteral">"Obama"</span>, <span class="stringliteral">"Barack"</span>, 2009, 2014},</div><div class="line"> {1, <span class="stringliteral">"Bush"</span>, <span class="stringliteral">"George W"</span>, 2001, 2009}, {2, <span class="stringliteral">"Clinton"</span>, <span class="stringliteral">"Bill"</span>, 1993, 2001},</div><div class="line"> {3, <span class="stringliteral">"Bush"</span>, <span class="stringliteral">"George H"</span>, 1989, 1993}, {4, <span class="stringliteral">"Reagan"</span>, <span class="stringliteral">"Ronald"</span>, 1981, 1989}, {0, NULL, NULL, 0, 0}};</div><div class="line"><span class="comment">/*</span></div><div class="line"><span class="comment"> * Number of years this data spans</span></div><div class="line"><span class="comment"> */</span></div><div class="line"><span class="preprocessor">#define YEAR_BASE 1981</span></div><div class="line"><span class="preprocessor">#define YEAR_SPAN (2014 - 1981)</span></div><div class="line"></div><div class="line"><span class="comment">/*</span></div><div class="line"><span class="comment"> * A custom index extractor function that adds an index entry for each year of the given president's</span></div><div class="line"><span class="comment"> * term.</span></div><div class="line"><span class="comment"> */</span></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span></div><div class="line">my_extract(<a name="_a0"></a><a class="code" href="struct_w_t___e_x_t_r_a_c_t_o_r.html">WT_EXTRACTOR</a> *extractor, <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> *key, <span class="keyword">const</span> <a class="code" href="group__wt.html#struct_w_t___i_t_e_m">WT_ITEM</a> *value,</div><div class="line"> <a name="_a3"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html">WT_CURSOR</a> *result_cursor)</div><div class="line">{</div><div class="line"> uint16_t term_end, term_start, year;</div><div class="line"> <span class="keywordtype">char</span> *last_name, *first_name;</div><div class="line"></div><div class="line"> <span class="comment">/* Unused parameters */</span></div><div class="line"> (void)extractor;</div><div class="line"> (void)key;</div><div class="line"></div><div class="line"> <span class="comment">/* Unpack the value. */</span></div><div class="line"> error_check(<a name="a4"></a><a class="code" href="group__wt.html#ga7cdc8c688f2c15303188ed6999dcc1b4">wiredtiger_struct_unpack</a>(</div><div class="line"> session, value-><a name="a5"></a><a class="code" href="group__wt.html#a57f5e62aa968275d7e398cfa70e49450">data</a>, value-><a name="a6"></a><a class="code" href="group__wt.html#abd8b1299dfb5c54dc049fa42a4680b55">size</a>, <span class="stringliteral">"SSHH"</span>, &last_name, &first_name, &term_start, &term_end));</div><div class="line"></div><div class="line"> <span class="comment">/*</span></div><div class="line"><span class="comment"> * We have overlapping years, so multiple records may share the same index key.</span></div><div class="line"><span class="comment"> */</span></div><div class="line"> <span class="keywordflow">for</span> (year = term_start; year <= term_end; ++year) {</div><div class="line"> <span class="comment">/*</span></div><div class="line"><span class="comment"> * Note that the extract callback is called for all operations</span></div><div class="line"><span class="comment"> * that update the table, not just inserts. The user sets the</span></div><div class="line"><span class="comment"> * key and uses the cursor->insert() method to return the index</span></div><div class="line"><span class="comment"> * key(s). WiredTiger will perform the required operation</span></div><div class="line"><span class="comment"> * (such as a remove()).</span></div><div class="line"><span class="comment"> */</span></div><div class="line"> fprintf(</div><div class="line"> stderr, <span class="stringliteral">"EXTRACTOR: index op for year %"</span> PRIu16 <span class="stringliteral">": %s %s\n"</span>, year, first_name, last_name);</div><div class="line"> result_cursor-><a name="a7"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#ad1088d719df40babc1f57d086691ebdc">set_key</a>(result_cursor, year);</div><div class="line"> error_check(result_cursor-><a name="a8"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#aac90d9fbcc031570f924db55f8a1cee3">insert</a>(result_cursor));</div><div class="line"> }</div><div class="line"> <span class="keywordflow">return</span> (0);</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/*</span></div><div class="line"><span class="comment"> * The terminate method is called to release any allocated resources when the table is closed. In</span></div><div class="line"><span class="comment"> * this example, no cleanup is required.</span></div><div class="line"><span class="comment"> */</span></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span></div><div class="line">my_extract_terminate(<a class="code" href="struct_w_t___e_x_t_r_a_c_t_o_r.html">WT_EXTRACTOR</a> *extractor, <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"> (void)extractor;</div><div class="line"> (void)session;</div><div class="line"></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> <span class="keywordtype">void</span></div><div class="line">add_extractor(<a name="_a9"></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">{</div><div class="line"> <span class="keyword">static</span> <a class="code" href="struct_w_t___e_x_t_r_a_c_t_o_r.html">WT_EXTRACTOR</a> my_extractor = {my_extract, NULL, my_extract_terminate};</div><div class="line"> error_check(conn-><a name="a10"></a><a class="code" href="struct_w_t___c_o_n_n_e_c_t_i_o_n.html#a2d65a70a305838e2a2a728fe5cb54903">add_extractor</a>(conn, <span class="stringliteral">"my_extractor"</span>, &my_extractor, NULL));</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/*</span></div><div class="line"><span class="comment"> * Read the index by year and print out who was in office that year.</span></div><div class="line"><span class="comment"> */</span></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span></div><div class="line">read_index(<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"> <a class="code" href="struct_w_t___c_u_r_s_o_r.html">WT_CURSOR</a> *cursor;</div><div class="line"> <span class="keywordtype">int</span> i, ret;</div><div class="line"> <span class="keywordtype">char</span> *first_name, *last_name;</div><div class="line"> uint16_t rec_year, term_end, term_start, year;</div><div class="line"></div><div class="line"> year = 0;</div><div class="line"> srand((<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)getpid());</div><div class="line"> error_check(session-><a name="a11"></a><a class="code" href="struct_w_t___s_e_s_s_i_o_n.html#afb5b4a69c2c5cafe411b2b04fdc1c75d">open_cursor</a>(session, <span class="stringliteral">"index:presidents:term"</span>, NULL, NULL, &cursor));</div><div class="line"></div><div class="line"> <span class="comment">/*</span></div><div class="line"><span class="comment"> * Pick 10 random years and read the data.</span></div><div class="line"><span class="comment"> */</span></div><div class="line"> <span class="keywordflow">for</span> (i = 0; i < 10; i++) {</div><div class="line"> year = (uint16_t)((rand() % YEAR_SPAN) + YEAR_BASE);</div><div class="line"> printf(<span class="stringliteral">"Year %"</span> PRIu16 <span class="stringliteral">":\n"</span>, year);</div><div class="line"> cursor-><a class="code" href="struct_w_t___c_u_r_s_o_r.html#ad1088d719df40babc1f57d086691ebdc">set_key</a>(cursor, year);</div><div class="line"> error_check(cursor-><a name="a12"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#a7e25b2ced2cf3ec68bd5429bf921c79f">search</a>(cursor));</div><div class="line"> error_check(cursor-><a name="a13"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#af19f6f9d9c7fc248ab38879032620b2f">get_key</a>(cursor, &rec_year));</div><div class="line"> error_check(cursor-><a name="a14"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#af85364a5af50b95bbc46c82e72f75c01">get_value</a>(cursor, &last_name, &first_name, &term_start, &term_end));</div><div class="line"></div><div class="line"> <span class="comment">/* Report all presidents that served during the chosen year */</span></div><div class="line"> ret = 0;</div><div class="line"> <span class="keywordflow">while</span> (term_start <= year && year <= term_end && year == rec_year) {</div><div class="line"> printf(<span class="stringliteral">"\t%s %s\n"</span>, first_name, last_name);</div><div class="line"> <span class="keywordflow">if</span> ((ret = cursor-><a name="a15"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#a0503f16bd8f3d05aa3552f229b3a8e1b">next</a>(cursor)) != 0)</div><div class="line"> <span class="keywordflow">break</span>;</div><div class="line"> error_check(cursor-><a class="code" href="struct_w_t___c_u_r_s_o_r.html#af19f6f9d9c7fc248ab38879032620b2f">get_key</a>(cursor, &rec_year));</div><div class="line"> error_check(cursor-><a class="code" href="struct_w_t___c_u_r_s_o_r.html#af85364a5af50b95bbc46c82e72f75c01">get_value</a>(cursor, &last_name, &first_name, &term_start, &term_end));</div><div class="line"> }</div><div class="line"> scan_end_check(ret == 0 || ret == <a name="a16"></a><a class="code" href="group__wt.html#ga3c9e1b494d95cf34404ab7a974af6bf8">WT_NOTFOUND</a>);</div><div class="line"> }</div><div class="line"></div><div class="line"> error_check(cursor-><a name="a17"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#aeea071f192cab12245a50fbe71c3460b">close</a>(cursor));</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/*</span></div><div class="line"><span class="comment"> * Remove some items from the primary table.</span></div><div class="line"><span class="comment"> */</span></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span></div><div class="line">remove_items(<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"> <a class="code" href="struct_w_t___c_u_r_s_o_r.html">WT_CURSOR</a> *cursor;</div><div class="line"> <span class="keyword">struct </span>president_data p;</div><div class="line"> <span class="keywordtype">int</span> i;</div><div class="line"></div><div class="line"> <span class="comment">/*</span></div><div class="line"><span class="comment"> * Removing items from the primary table will call the extractor for the index and allow our</span></div><div class="line"><span class="comment"> * custom extractor code to handle each custom key.</span></div><div class="line"><span class="comment"> */</span></div><div class="line"> error_check(session-><a class="code" href="struct_w_t___s_e_s_s_i_o_n.html#afb5b4a69c2c5cafe411b2b04fdc1c75d">open_cursor</a>(session, <span class="stringliteral">"table:presidents"</span>, NULL, NULL, &cursor));</div><div class="line"> <span class="comment">/*</span></div><div class="line"><span class="comment"> * Just remove the first few items.</span></div><div class="line"><span class="comment"> */</span></div><div class="line"> <span class="keywordflow">for</span> (i = 0; example_data[i].last_name != NULL && i < 2; i++) {</div><div class="line"> p = example_data[i];</div><div class="line"> cursor-><a class="code" href="struct_w_t___c_u_r_s_o_r.html#ad1088d719df40babc1f57d086691ebdc">set_key</a>(cursor, p.id);</div><div class="line"> error_check(cursor-><a name="a18"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#abbba24fe607fee519c4c9c4669cd4455">remove</a>(cursor));</div><div class="line"> }</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/*</span></div><div class="line"><span class="comment"> * Set up the table and index of the data.</span></div><div class="line"><span class="comment"> */</span></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span></div><div class="line">setup_table(<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"> <a class="code" href="struct_w_t___c_u_r_s_o_r.html">WT_CURSOR</a> *cursor;</div><div class="line"> <span class="keyword">struct </span>president_data p;</div><div class="line"> <span class="keywordtype">int</span> i;</div><div class="line"></div><div class="line"> <span class="comment">/* Create the primary table. It has a key of the unique ID. */</span></div><div class="line"> error_check(session-><a name="a19"></a><a class="code" href="struct_w_t___s_e_s_s_i_o_n.html#a358ca4141d59c345f401c58501276bbb">create</a>(session, <span class="stringliteral">"table:presidents"</span>,</div><div class="line"> <span class="stringliteral">"key_format=I,value_format=SSHH,"</span></div><div class="line"> <span class="stringliteral">"columns=(ID,last_name,first_name,term_begin,term_end)"</span>));</div><div class="line"></div><div class="line"> <span class="comment">/*</span></div><div class="line"><span class="comment"> * Create the index that is generated with an extractor. The index will generate an entry in the</span></div><div class="line"><span class="comment"> * index for each year a president was in office.</span></div><div class="line"><span class="comment"> */</span></div><div class="line"> error_check(session-><a class="code" href="struct_w_t___s_e_s_s_i_o_n.html#a358ca4141d59c345f401c58501276bbb">create</a>(</div><div class="line"> session, <span class="stringliteral">"index:presidents:term"</span>, <span class="stringliteral">"key_format=H,columns=(term),extractor=my_extractor"</span>));</div><div class="line"></div><div class="line"> error_check(session-><a class="code" href="struct_w_t___s_e_s_s_i_o_n.html#afb5b4a69c2c5cafe411b2b04fdc1c75d">open_cursor</a>(session, <span class="stringliteral">"table:presidents"</span>, NULL, NULL, &cursor));</div><div class="line"> <span class="keywordflow">for</span> (i = 0; example_data[i].last_name != NULL; i++) {</div><div class="line"> p = example_data[i];</div><div class="line"> cursor-><a class="code" href="struct_w_t___c_u_r_s_o_r.html#ad1088d719df40babc1f57d086691ebdc">set_key</a>(cursor, p.id);</div><div class="line"> cursor-><a name="a20"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#a27f7cbd0cd3e561f6a145704813ad64c">set_value</a>(cursor, p.last_name, p.first_name, p.term_start, p.term_end);</div><div class="line"> fprintf(stderr, <span class="stringliteral">"SETUP: table insert %"</span> PRIu16 <span class="stringliteral">"-%"</span> PRIu16 <span class="stringliteral">": %s %s\n"</span>, p.term_start,</div><div class="line"> p.term_end, p.first_name, p.last_name);</div><div class="line"> error_check(cursor-><a class="code" href="struct_w_t___c_u_r_s_o_r.html#aac90d9fbcc031570f924db55f8a1cee3">insert</a>(cursor));</div><div class="line"> }</div><div class="line">}</div><div class="line"></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 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"> error_check(<a name="a21"></a><a class="code" href="group__wt.html#gacbe8d118f978f5bfc8ccb4c77c9e8813">wiredtiger_open</a>(home, NULL, <span class="stringliteral">"create,cache_size=500M"</span>, &conn));</div><div class="line"> add_extractor(conn);</div><div class="line"> error_check(conn-><a name="a22"></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"> setup_table(session);</div><div class="line"> read_index(session);</div><div class="line"> remove_items(session);</div><div class="line"></div><div class="line"> error_check(conn-><a name="a23"></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"></div><div class="line"> <span class="keywordflow">return</span> (EXIT_SUCCESS);</div><div class="line">}</div></div><!-- fragment --> </div><!-- contents -->
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