Question

http://1978th.net/tokyocabinet/tokyoproducts.pdf

概述：

• Tokyo Cabinet – database library

• Tokyo Tyrant – database server

• Tokyo Dystopia – full-text search engine

• Tokyo Promenade – content management system

• open source – released under LGPL

• powerful, portable, practical – written in the standard C, optimized to POSIX

下图为 Tokyo Products

图 10 Tokyo Products

TC 实现

TC: database library. ( libtokyocabinet.so )

支持各种 storage 方式。

• hash (hdb)
• B+ tree (bdb)
• array: fixed-len (adb)
• table (tdb)
• …

Eg., B+tree db object:

tcbdbopen, tcbdbput2, tcbdbget2, #tcbdbcurnew, tcbdbclose

测试程序：(perl, Ruby…)

http://1978th.net/tokyocabinet/perldoc/#example

Example Code:

// Makefile: gcc tctest.c  -ltokyocabinet
#include <tcutil.h>
#include <tchdb.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdint.h>
int main(int argc, char **argv)
{
        TCHDB *hdb;
        int ecode;
        char *key, *value;
        /* create the object */
        hdb = tchdbnew();
        /* open the database */
        if(!tchdbopen(hdb, "casket.hdb", HDBOWRITER | HDBOCREAT)) {
                ecode = tchdbecode(hdb);
                fprintf(stderr, "open error: %s￥n", tchdberrmsg(ecode));
        }
        /* store records */
        if(!tchdbput2(hdb, "foo", "hop") ||
            !tchdbput2(hdb, "bar", "step") ||
            !tchdbput2(hdb, "baz", "jump")) {
                ecode = tchdbecode(hdb);
                fprintf(stderr, "put error: %s￥n", tchdberrmsg(ecode));
        }
        /* retrieve records */
        value = tchdbget2(hdb, "foo");
        if(value) {
                printf("%s￥n", value);
                free(value);
        } else {
                ecode = tchdbecode(hdb);
                //fprintf(printf(stderr, "get error: %s/n", tchdberrmsg(ecode));
                }
                /* traverse records */
                tchdbiterinit(hdb);
        while((key = tchdbiternext2(hdb)) != NULL) {
                value = tchdbget2(hdb, key);
                if(value) {
                        printf("%s:%s￥n", key, value);
                        free(value);
                }
                free(key);
        }
        /* close the database */
        if(!tchdbclose(hdb)) {
                ecode = tchdbecode(hdb);
                fprintf(stderr, "close error: %s￥n", tchdberrmsg(ecode));
        }
        /* delete the object */
        tchdbdel(hdb);
        return 0;
}