第二章 C语言实例 — Tokyo Cabinet 的数据库操作

最近在研究C语言对一些库的编程

 

首先自然要安装Tokyo Cabinet

 

tar zxvf tokyocabinet-1.4.28.tar.gz
cd tokyocabinet-1.4.28/
./configure
make
make install
cd ../

 

 

 

以下是对Tokyo Cabinet 的操作，具体解释可以看代码—代码是最好的解释.

文件名称是:tcbdb.c

 

/**
 * Operate the Tokyo Cabinet
 * @author zhoubaochuan
 * @email:[email protected]
 * @date:2011-07-13
 * @gcc: gcc tcbdb.c  -I/usr/local/include/ -L/usr/local/lib/ -ltokyocabinet -lz -lbz2 -lrt -lpthread -lm -lc -O2 -g --static
 */

#include <stdio.h>

/* Import the Tokyo Cabinet C's library*/
#include <tcbdb.h>

int main(int argc, char *argv[]){
    char *datapath = "/opt/data/test/C/queue/tcbdb.db";
    /* Allocate a region on memory */
    char *dataname = (char *)tccalloc(1,1024);

    
    TCBDB *db = tcbdbnew(); /* Create a B+ tree database object  */
    tcbdbsetmutex(db);
    tcbdbtune(db,128,256, 32749,8,10,100);
    tcbdbsetcache(db,1024,512);
    tcbdbsetxmsiz(db,1024100);

    
    if(!tcbdbopen(db,datapath,BDBOWRITER|BDBOREADER)){  /* Open a database file and connect a B+ tree database object. */
        fprintf(stderr,"It is failure to open a database !\n");
        exit(1);
    }   
    //free((void *)datapath);
    //fprintf(stderr,"==============It is successful to open a database : ===============\n");

    char *key = "t_key";
    char *value = "zhoubaochuan";

    fprintf(stderr, "============== Store value. ================\n key:%s; \n value:%s \n ", key, value);
    /* Store a new record into a B+ tree database object. */
    tcbdbput2(db, key, value);

    fprintf(stderr, "============== Retrieve a record. ================\n");
    /* Retrieve a record in a B+ tree database object as a volatile buffer. */
    char *retrieve = tcbdbget2(db,key);
    fprintf(stderr, "Retriver's Value:%s \n", retrieve);

    /* Synchronize updated contents of a B+ tree database object with the file and the device. */
    tcbdbsync(db);   /* 实时刷新到磁盘 */

    /* Close a B+ tree database object. */
    tcbdbclose(db);
    
    return 0;
}

 

 

编译

 

 gcc tcbdb.c  -I/usr/local/include/ -L/usr/local/lib/ -ltokyocabinet -lz -lbz2 -lrt -lpthread -lm -lc -O2 -g --static

 

 

执行结果

 

[root@zhoubc queue]# ./a.out 
============== Store value. ================
 key:t_key; 
 value:zhoubaochuan 
 ============== Retrieve a record. ================
Retriver's Value:zhoubaochuan 

 

 

参考文献:

http://fallabs.com/tokyocabinet/