117 lines
3.6 KiB
C
117 lines
3.6 KiB
C
/*-
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* Public Domain 2008-2014 WiredTiger, Inc.
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*
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* This is free and unencumbered software released into the public domain.
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*
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* Anyone is free to copy, modify, publish, use, compile, sell, or
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* distribute this software, either in source code form or as a compiled
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* binary, for any purpose, commercial or non-commercial, and by any
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* means.
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*
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* In jurisdictions that recognize copyright laws, the author or authors
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* of this software dedicate any and all copyright interest in the
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* software to the public domain. We make this dedication for the benefit
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* of the public at large and to the detriment of our heirs and
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* successors. We intend this dedication to be an overt act of
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* relinquishment in perpetuity of all present and future rights to this
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* software under copyright law.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* ex_extending.c
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* This is an example demonstrating ways to extend WiredTiger with
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* extractors, collators and loadable modules.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <wiredtiger.h>
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const char *home = NULL;
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/*! [case insensitive comparator] */
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/* A simple case insensitive comparator. */
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static int
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__compare_nocase(WT_COLLATOR *collator, WT_SESSION *session,
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const WT_ITEM *v1, const WT_ITEM *v2, int *cmp)
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{
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const char *s1 = (const char *)v1->data;
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const char *s2 = (const char *)v2->data;
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(void)session; /* unused */
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(void)collator; /* unused */
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*cmp = strcasecmp(s1, s2);
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return (0);
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}
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static WT_COLLATOR nocasecoll = { __compare_nocase, NULL };
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/*! [case insensitive comparator] */
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/*! [n character comparator] */
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/*
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* Comparator that only compares the first N prefix characters of the string.
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* This has associated data, so we need to extend WT_COLLATOR.
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*/
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typedef struct {
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WT_COLLATOR iface;
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uint32_t maxlen;
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} PREFIX_COLLATOR;
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static int
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__compare_prefixes(WT_COLLATOR *collator, WT_SESSION *session,
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const WT_ITEM *v1, const WT_ITEM *v2, int *cmp)
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{
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PREFIX_COLLATOR *pcoll = (PREFIX_COLLATOR *)collator;
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const char *s1 = (const char *)v1->data;
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const char *s2 = (const char *)v2->data;
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(void)session; /* unused */
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*cmp = strncmp(s1, s2, pcoll->maxlen);
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return (0);
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}
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static PREFIX_COLLATOR pcoll10 = { {__compare_prefixes, NULL}, 10 };
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/*! [n character comparator] */
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int main(void)
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{
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int ret;
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WT_CONNECTION *conn;
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WT_SESSION *session;
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/* Open a connection to the database, creating it if necessary. */
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if ((ret = wiredtiger_open(home, NULL, "create", &conn)) != 0)
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fprintf(stderr, "Error connecting to %s: %s\n",
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home, wiredtiger_strerror(ret));
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/*! [add collator nocase] */
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ret = conn->add_collator(conn, "nocase", &nocasecoll, NULL);
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/*! [add collator nocase] */
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/*! [add collator prefix10] */
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ret = conn->add_collator(conn, "prefix10", &pcoll10.iface, NULL);
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/* Open a session for the current thread's work. */
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if ((ret = conn->open_session(conn, NULL, NULL, &session)) != 0)
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fprintf(stderr, "Error opening a session on %s: %s\n",
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home, wiredtiger_strerror(ret));
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/* XXX Do some work... */
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/* Note: closing the connection implicitly closes open session(s). */
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if ((ret = conn->close(conn, NULL)) != 0)
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/*! [add collator prefix10] */
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fprintf(stderr, "Error connecting to %s: %s\n",
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home, wiredtiger_strerror(ret));
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return (ret);
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}
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