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Diffstat (limited to 'src/third_party/wiredtiger/examples/c/ex_cursor.c')
| -rw-r--r-- | src/third_party/wiredtiger/examples/c/ex_cursor.c | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/src/third_party/wiredtiger/examples/c/ex_cursor.c b/src/third_party/wiredtiger/examples/c/ex_cursor.c new file mode 100644 index 00000000000..112e38f9a2e --- /dev/null +++ b/src/third_party/wiredtiger/examples/c/ex_cursor.c @@ -0,0 +1,228 @@ +/*- + * Public Domain 2014-2015 MongoDB, Inc. + * Public Domain 2008-2014 WiredTiger, Inc. + * + * This is free and unencumbered software released into the public domain. + * + * Anyone is free to copy, modify, publish, use, compile, sell, or + * distribute this software, either in source code form or as a compiled + * binary, for any purpose, commercial or non-commercial, and by any + * means. + * + * In jurisdictions that recognize copyright laws, the author or authors + * of this software dedicate any and all copyright interest in the + * software to the public domain. We make this dedication for the benefit + * of the public at large and to the detriment of our heirs and + * successors. We intend this dedication to be an overt act of + * relinquishment in perpetuity of all present and future rights to this + * software under copyright law. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * ex_cursor.c + * This is an example demonstrating some cursor types and operations. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include <wiredtiger.h> + +int cursor_reset(WT_CURSOR *cursor); +int cursor_forward_scan(WT_CURSOR *cursor); +int cursor_reverse_scan(WT_CURSOR *cursor); +int cursor_search(WT_CURSOR *cursor); +int cursor_search_near(WT_CURSOR *cursor); +int cursor_insert(WT_CURSOR *cursor); +int cursor_update(WT_CURSOR *cursor); +int cursor_remove(WT_CURSOR *cursor); + +static const char *home; + +/*! [cursor next] */ +int +cursor_forward_scan(WT_CURSOR *cursor) +{ + const char *key, *value; + int ret; + + while ((ret = cursor->next(cursor)) == 0) { + ret = cursor->get_key(cursor, &key); + ret = cursor->get_value(cursor, &value); + } + return (ret); +} +/*! [cursor next] */ + +/*! [cursor prev] */ +int +cursor_reverse_scan(WT_CURSOR *cursor) +{ + const char *key, *value; + int ret; + + while ((ret = cursor->prev(cursor)) == 0) { + ret = cursor->get_key(cursor, &key); + ret = cursor->get_value(cursor, &value); + } + return (ret); +} +/*! [cursor prev] */ + +/*! [cursor reset] */ +int +cursor_reset(WT_CURSOR *cursor) +{ + return (cursor->reset(cursor)); +} +/*! [cursor reset] */ + +/*! [cursor search] */ +int +cursor_search(WT_CURSOR *cursor) +{ + const char *value; + int ret; + + cursor->set_key(cursor, "foo"); + + if ((ret = cursor->search(cursor)) != 0) + ret = cursor->get_value(cursor, &value); + + return (ret); +} +/*! [cursor search] */ + +/*! [cursor search near] */ +int +cursor_search_near(WT_CURSOR *cursor) +{ + const char *key, *value; + int exact, ret; + + cursor->set_key(cursor, "foo"); + + if ((ret = cursor->search_near(cursor, &exact)) == 0) { + switch (exact) { + case -1: /* Returned key smaller than search key */ + ret = cursor->get_key(cursor, &key); + break; + case 0: /* Exact match found */ + break; + case 1: /* Returned key larger than search key */ + ret = cursor->get_key(cursor, &key); + break; + } + + ret = cursor->get_value(cursor, &value); + } + + return (ret); +} +/*! [cursor search near] */ + +/*! [cursor insert] */ +int +cursor_insert(WT_CURSOR *cursor) +{ + cursor->set_key(cursor, "foo"); + cursor->set_value(cursor, "bar"); + + return (cursor->insert(cursor)); +} +/*! [cursor insert] */ + +/*! [cursor update] */ +int +cursor_update(WT_CURSOR *cursor) +{ + cursor->set_key(cursor, "foo"); + cursor->set_value(cursor, "newbar"); + + return (cursor->update(cursor)); +} +/*! [cursor update] */ + +/*! [cursor remove] */ +int +cursor_remove(WT_CURSOR *cursor) +{ + cursor->set_key(cursor, "foo"); + return (cursor->remove(cursor)); +} +/*! [cursor remove] */ + +int +main(void) +{ + WT_CONNECTION *conn; + WT_CURSOR *cursor; + WT_SESSION *session; + int ret; + + /* + * Create a clean test directory for this run of the test program if the + * environment variable isn't already set (as is done by make check). + */ + if (getenv("WIREDTIGER_HOME") == NULL) { + home = "WT_HOME"; + ret = system("rm -rf WT_HOME && mkdir WT_HOME"); + } else + home = NULL; + + /* Open a connection to the database, creating it if necessary. */ + if ((ret = wiredtiger_open( + home, NULL, "create,statistics=(fast)", &conn)) != 0) + fprintf(stderr, "Error connecting to %s: %s\n", + home, wiredtiger_strerror(ret)); + + /* Open a session for the current thread's work. */ + if ((ret = conn->open_session(conn, NULL, NULL, &session)) != 0) + fprintf(stderr, "Error opening a session on %s: %s\n", + home, wiredtiger_strerror(ret)); + + ret = session->create(session, "table:world", + "key_format=r,value_format=5sii," + "columns=(id,country,population,area)"); + + /*! [open cursor #1] */ + ret = session->open_cursor(session, "table:world", NULL, NULL, &cursor); + /*! [open cursor #1] */ + + /*! [open cursor #2] */ + ret = session->open_cursor(session, + "table:world(country,population)", NULL, NULL, &cursor); + /*! [open cursor #2] */ + + /*! [open cursor #3] */ + ret = session->open_cursor(session, "statistics:", NULL, NULL, &cursor); + /*! [open cursor #3] */ + + /* Create a simple string table to illustrate basic operations. */ + ret = session->create(session, "table:map", + "key_format=S,value_format=S"); + ret = session->open_cursor(session, "table:map", NULL, NULL, &cursor); + ret = cursor_insert(cursor); + ret = cursor_reset(cursor); + ret = cursor_forward_scan(cursor); + ret = cursor_reset(cursor); + ret = cursor_reverse_scan(cursor); + ret = cursor_search_near(cursor); + ret = cursor_update(cursor); + ret = cursor_remove(cursor); + ret = cursor->close(cursor); + + /* Note: closing the connection implicitly closes open session(s). */ + if ((ret = conn->close(conn, NULL)) != 0) + fprintf(stderr, "Error closing %s: %s\n", + home, wiredtiger_strerror(ret)); + + return (ret); +} |