一、下载(4.6.21版本)

http://www.oracle.com/technetwork/database/berkeleydb/downloads/index-082944.html

 

二、编译与安装

2.1 解压db-4.6.21.tar.gz；
2.2 cd db-4.6.21/build_unix
2.3 生成Makefile文件： ../configure
2.4 生成程序： make
2.5 安装程序：make install
2.6 安装后的目录： /usr/local/BerkeleyDB.4.6

 

三、示例程序

#include <stdio.h>
#include <string.h>
#include <db.h>

int main()
{
    DB *db;
    DBT key, data;
    DBC *cursorp;
    int ret;
    char tmpstr[4];

 

    /* init key, data,seems meanless */
    memset(&key, 0, sizeof(DBT));
    memset(&data, 0, sizeof(DBT));

 

    /* create a db handle */
    db_create(&db, NULL, 0);

 

    /* open db mydb.db, create it if not exist */
    db->open(db, NULL, "mydb.db", NULL, DB_BTREE, DB_CREATE, 0);

 

    /* put key and data pair into bdb.db */
    int i = 0;
    for(i = 0; i < 10; i ++)
    {
        /* set value of key and data pair to be insert into mydb.db */
        sprintf(tmpstr, "key%d", i);
        key.data = tmpstr;
        key.size = strlen(key.data);

        data.data = tmpstr;
        data.size = strlen(data.data);

        ret = db->put(db, NULL, &key, &data, DB_NOOVERWRITE);            

        printf("ret:%d/n", ret); /* ret == 0 means inserting success */
    }

    /* get data from db */
    data.data = "i am key11111's data";
    strcpy(tmpstr, "key0");
    key.data = &tmpstr;
    key.ulen = sizeof(key.data);
    key.flags = DB_DBT_USERMEM;

    if(0 != db->get(db, NULL, &key, &data, 0))
    {
        printf("data not found!/n");  /*why?*/
    }
    else
    {
        printf("key's data:%s/n", data.data);
    }

    /* close db handle */
    if(NULL != db)
    {
        db->close(db, 0);
    }

 

    return 0;
}