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<div class="title">ex_cursor.c</div> </div>
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<p>Shows some common cursor types and operations.</p>
<div class="fragment"><div class="line"><span class="comment">/*-</span></div>
<div class="line"><span class="comment"> * Public Domain 2014-2016 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>
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<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_cursor.c</span></div>
<div class="line"><span class="comment"> * This is an example demonstrating some cursor types and operations.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#include <stdio.h></span></div>
<div class="line"><span class="preprocessor">#include <stdlib.h></span></div>
<div class="line"><span class="preprocessor">#include <string.h></span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#include <wiredtiger.h></span></div>
<div class="line"></div>
<div class="line"><span class="keywordtype">int</span> cursor_reset(<a name="_a0"></a><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> cursor_forward_scan(<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> cursor_reverse_scan(<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> cursor_search(<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> cursor_search_near(<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> cursor_insert(<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> cursor_update(<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> cursor_remove(<a class="code" href="struct_w_t___c_u_r_s_o_r.html">WT_CURSOR</a> *cursor);</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="keywordtype">int</span></div>
<div class="line">cursor_forward_scan(<a class="code" href="struct_w_t___c_u_r_s_o_r.html">WT_CURSOR</a> *cursor)</div>
<div class="line">{</div>
<div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *key, *value;</div>
<div class="line"> <span class="keywordtype">int</span> ret;</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">while</span> ((ret = cursor-><a name="a1"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#a0503f16bd8f3d05aa3552f229b3a8e1b">next</a>(cursor)) == 0) {</div>
<div class="line"> ret = cursor-><a name="a2"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#af19f6f9d9c7fc248ab38879032620b2f">get_key</a>(cursor, &key);</div>
<div class="line"> ret = cursor-><a name="a3"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#af85364a5af50b95bbc46c82e72f75c01">get_value</a>(cursor, &value);</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">return</span> (ret);</div>
<div class="line">}</div>
<div class="line"><span class="keywordtype">int</span></div>
<div class="line">cursor_reverse_scan(<a class="code" href="struct_w_t___c_u_r_s_o_r.html">WT_CURSOR</a> *cursor)</div>
<div class="line">{</div>
<div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *key, *value;</div>
<div class="line"> <span class="keywordtype">int</span> ret;</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">while</span> ((ret = cursor-><a name="a4"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#a43d6664d2f68902aa63f933864242e76">prev</a>(cursor)) == 0) {</div>
<div class="line"> ret = cursor-><a class="code" href="struct_w_t___c_u_r_s_o_r.html#af19f6f9d9c7fc248ab38879032620b2f">get_key</a>(cursor, &key);</div>
<div class="line"> ret = cursor-><a class="code" href="struct_w_t___c_u_r_s_o_r.html#af85364a5af50b95bbc46c82e72f75c01">get_value</a>(cursor, &value);</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">return</span> (ret);</div>
<div class="line">}</div>
<div class="line"><span class="keywordtype">int</span></div>
<div class="line">cursor_reset(<a class="code" href="struct_w_t___c_u_r_s_o_r.html">WT_CURSOR</a> *cursor)</div>
<div class="line">{</div>
<div class="line"> <span class="keywordflow">return</span> (cursor-><a name="a5"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#afc1b42c22c9c85e1ba08ce3b34437565">reset</a>(cursor));</div>
<div class="line">}</div>
<div class="line"><span class="keywordtype">int</span></div>
<div class="line">cursor_search(<a class="code" href="struct_w_t___c_u_r_s_o_r.html">WT_CURSOR</a> *cursor)</div>
<div class="line">{</div>
<div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *value;</div>
<div class="line"> <span class="keywordtype">int</span> ret;</div>
<div class="line"></div>
<div class="line"> cursor-><a name="a6"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#ad1088d719df40babc1f57d086691ebdc">set_key</a>(cursor, <span class="stringliteral">"foo"</span>);</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">if</span> ((ret = cursor-><a name="a7"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#a7e25b2ced2cf3ec68bd5429bf921c79f">search</a>(cursor)) == 0)</div>
<div class="line"> ret = cursor-><a class="code" href="struct_w_t___c_u_r_s_o_r.html#af85364a5af50b95bbc46c82e72f75c01">get_value</a>(cursor, &value);</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> (ret);</div>
<div class="line">}</div>
<div class="line"><span class="keywordtype">int</span></div>
<div class="line">cursor_search_near(<a class="code" href="struct_w_t___c_u_r_s_o_r.html">WT_CURSOR</a> *cursor)</div>
<div class="line">{</div>
<div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *key, *value;</div>
<div class="line"> <span class="keywordtype">int</span> exact, ret;</div>
<div class="line"></div>
<div class="line"> cursor-><a class="code" href="struct_w_t___c_u_r_s_o_r.html#ad1088d719df40babc1f57d086691ebdc">set_key</a>(cursor, <span class="stringliteral">"foo"</span>);</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">if</span> ((ret = cursor-><a name="a8"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#a8068ddce20d0775f26f6dac6e5eb209c">search_near</a>(cursor, &exact)) == 0) {</div>
<div class="line"> <span class="keywordflow">switch</span> (exact) {</div>
<div class="line"> <span class="keywordflow">case</span> -1: <span class="comment">/* Returned key smaller than search key */</span></div>
<div class="line"> ret = cursor-><a class="code" href="struct_w_t___c_u_r_s_o_r.html#af19f6f9d9c7fc248ab38879032620b2f">get_key</a>(cursor, &key);</div>
<div class="line"> <span class="keywordflow">break</span>;</div>
<div class="line"> <span class="keywordflow">case</span> 0: <span class="comment">/* Exact match found */</span></div>
<div class="line"> <span class="keywordflow">break</span>;</div>
<div class="line"> <span class="keywordflow">case</span> 1: <span class="comment">/* Returned key larger than search key */</span></div>
<div class="line"> ret = cursor-><a class="code" href="struct_w_t___c_u_r_s_o_r.html#af19f6f9d9c7fc248ab38879032620b2f">get_key</a>(cursor, &key);</div>
<div class="line"> <span class="keywordflow">break</span>;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> ret = cursor-><a class="code" href="struct_w_t___c_u_r_s_o_r.html#af85364a5af50b95bbc46c82e72f75c01">get_value</a>(cursor, &value);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> (ret);</div>
<div class="line">}</div>
<div class="line"><span class="keywordtype">int</span></div>
<div class="line">cursor_insert(<a class="code" href="struct_w_t___c_u_r_s_o_r.html">WT_CURSOR</a> *cursor)</div>
<div class="line">{</div>
<div class="line"> cursor-><a class="code" href="struct_w_t___c_u_r_s_o_r.html#ad1088d719df40babc1f57d086691ebdc">set_key</a>(cursor, <span class="stringliteral">"foo"</span>);</div>
<div class="line"> cursor-><a name="a9"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#a27f7cbd0cd3e561f6a145704813ad64c">set_value</a>(cursor, <span class="stringliteral">"bar"</span>);</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> (cursor-><a name="a10"></a><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"><span class="keywordtype">int</span></div>
<div class="line">cursor_update(<a class="code" href="struct_w_t___c_u_r_s_o_r.html">WT_CURSOR</a> *cursor)</div>
<div class="line">{</div>
<div class="line"> cursor-><a class="code" href="struct_w_t___c_u_r_s_o_r.html#ad1088d719df40babc1f57d086691ebdc">set_key</a>(cursor, <span class="stringliteral">"foo"</span>);</div>
<div class="line"> cursor-><a class="code" href="struct_w_t___c_u_r_s_o_r.html#a27f7cbd0cd3e561f6a145704813ad64c">set_value</a>(cursor, <span class="stringliteral">"newbar"</span>);</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> (cursor-><a name="a11"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#a444cdc0952e7f8d55d23173516c7037f">update</a>(cursor));</div>
<div class="line">}</div>
<div class="line"><span class="keywordtype">int</span></div>
<div class="line">cursor_remove(<a class="code" href="struct_w_t___c_u_r_s_o_r.html">WT_CURSOR</a> *cursor)</div>
<div class="line">{</div>
<div class="line"> cursor-><a class="code" href="struct_w_t___c_u_r_s_o_r.html#ad1088d719df40babc1f57d086691ebdc">set_key</a>(cursor, <span class="stringliteral">"foo"</span>);</div>
<div class="line"> <span class="keywordflow">return</span> (cursor-><a name="a12"></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"><span class="keywordtype">int</span></div>
<div class="line">main(<span class="keywordtype">void</span>)</div>
<div class="line">{</div>
<div class="line"> <a name="_a13"></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___c_u_r_s_o_r.html">WT_CURSOR</a> *cursor;</div>
<div class="line"> <a name="_a14"></a><a class="code" href="struct_w_t___s_e_s_s_i_o_n.html">WT_SESSION</a> *session;</div>
<div class="line"> <span class="keywordtype">int</span> ret;</div>
<div class="line"></div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Create a clean test directory for this run of the test program if the</span></div>
<div class="line"><span class="comment"> * environment variable isn't already set (as is done by make check).</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordflow">if</span> (getenv(<span class="stringliteral">"WIREDTIGER_HOME"</span>) == NULL) {</div>
<div class="line"> home = <span class="stringliteral">"WT_HOME"</span>;</div>
<div class="line"> ret = system(<span class="stringliteral">"rm -rf WT_HOME && mkdir WT_HOME"</span>);</div>
<div class="line"> } <span class="keywordflow">else</span></div>
<div class="line"> home = NULL;</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"> <span class="keywordflow">if</span> ((ret = <a name="a15"></a><a class="code" href="group__wt.html#ga9e6adae3fc6964ef837a62795c7840ed">wiredtiger_open</a>(</div>
<div class="line"> home, NULL, <span class="stringliteral">"create,statistics=(fast)"</span>, &conn)) != 0)</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Error connecting to %s: %s\n"</span>,</div>
<div class="line"> home == NULL ? <span class="stringliteral">"."</span> : home, <a name="a16"></a><a class="code" href="group__wt.html#gae8bf720ddb4a7a7390b70424594c40fd">wiredtiger_strerror</a>(ret));</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"> <span class="keywordflow">if</span> ((ret = conn-><a name="a17"></a><a class="code" href="struct_w_t___c_o_n_n_e_c_t_i_o_n.html#afc75c44ff4497627c59d9b6aaa64c9d8">open_session</a>(conn, NULL, NULL, &session)) != 0)</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Error opening a session on %s: %s\n"</span>,</div>
<div class="line"> home == NULL ? <span class="stringliteral">"."</span> : home, <a class="code" href="group__wt.html#gae8bf720ddb4a7a7390b70424594c40fd">wiredtiger_strerror</a>(ret));</div>
<div class="line"></div>
<div class="line"> ret = session-><a name="a18"></a><a class="code" href="struct_w_t___s_e_s_s_i_o_n.html#a358ca4141d59c345f401c58501276bbb">create</a>(session, <span class="stringliteral">"table:world"</span>,</div>
<div class="line"> <span class="stringliteral">"key_format=r,value_format=5sii,"</span></div>
<div class="line"> <span class="stringliteral">"columns=(id,country,population,area)"</span>);</div>
<div class="line"></div>
<div class="line"> ret = session-><a name="a19"></a><a class="code" href="struct_w_t___s_e_s_s_i_o_n.html#afb5b4a69c2c5cafe411b2b04fdc1c75d">open_cursor</a>(session, <span class="stringliteral">"table:world"</span>, NULL, NULL, &cursor);</div>
<div class="line"> ret = session-><a class="code" href="struct_w_t___s_e_s_s_i_o_n.html#afb5b4a69c2c5cafe411b2b04fdc1c75d">open_cursor</a>(session,</div>
<div class="line"> <span class="stringliteral">"table:world(country,population)"</span>, NULL, NULL, &cursor);</div>
<div class="line"> ret = session-><a class="code" href="struct_w_t___s_e_s_s_i_o_n.html#afb5b4a69c2c5cafe411b2b04fdc1c75d">open_cursor</a>(session, <span class="stringliteral">"statistics:"</span>, NULL, NULL, &cursor);</div>
<div class="line"> <span class="comment">/* Create a simple string table to illustrate basic operations. */</span></div>
<div class="line"> ret = session-><a class="code" href="struct_w_t___s_e_s_s_i_o_n.html#a358ca4141d59c345f401c58501276bbb">create</a>(session, <span class="stringliteral">"table:map"</span>,</div>
<div class="line"> <span class="stringliteral">"key_format=S,value_format=S"</span>);</div>
<div class="line"> ret = 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:map"</span>, NULL, NULL, &cursor);</div>
<div class="line"> ret = cursor_insert(cursor);</div>
<div class="line"> ret = cursor_reset(cursor);</div>
<div class="line"> ret = cursor_forward_scan(cursor);</div>
<div class="line"> ret = cursor_reset(cursor);</div>
<div class="line"> ret = cursor_reverse_scan(cursor);</div>
<div class="line"> ret = cursor_search_near(cursor);</div>
<div class="line"> ret = cursor_update(cursor);</div>
<div class="line"> ret = cursor_remove(cursor);</div>
<div class="line"> ret = cursor-><a name="a20"></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"> <span class="comment">/* Note: closing the connection implicitly closes open session(s). */</span></div>
<div class="line"> <span class="keywordflow">if</span> ((ret = conn-><a name="a21"></a><a class="code" href="struct_w_t___c_o_n_n_e_c_t_i_o_n.html#af535c517df851eeac8ebf3594d40b545">close</a>(conn, NULL)) != 0) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Error closing %s: %s\n"</span>,</div>
<div class="line"> home == NULL ? <span class="stringliteral">"."</span> : home, <a class="code" href="group__wt.html#gae8bf720ddb4a7a7390b70424594c40fd">wiredtiger_strerror</a>(ret));</div>
<div class="line"> <span class="keywordflow">return</span> (EXIT_FAILURE);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> (EXIT_SUCCESS);</div>
<div class="line">}</div>
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