BerkeleyDB安装及配置
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安装过程：
 
(环境： Kubuntu 7.10)

从其oracle公司官网http://www.oracle.com/technology/software/products/berkeley-db/index.html获得其安装包,当前版本为4.6.21
    #tar zxfv db-4.x.tgz
    #cd db-4.x/build_unix
 (仅用于unix平台安装)
    #../dist/configure
 (主意：
1、如果以gcc和g++编译的话,须执行#env CC=gcc CCC=g++ ../dist/configure，否则编译时出现段错误
2、
默认状态,berkeleyDB的lib和include将被安装到/usr/local/BerkeleyDB/下,需要更改这个路径的话,可以加上选
项--prefix,例如:#../dist/configure --prefix=/opt/BerkeleyDB.)
    #make
    #make install
    #vi /etc/ld.so.conf
(并
将berkeleyDB的lib路径加到该文件的最后一行,这样才能找到并加载它的库文件.ld.so.conf是系统动态链接库的配置文件.此文件内,
存放着可被LINUX共享的动态链接库所在目录的名字(系统目录/lib,/usr/lib除外),各个目录名间以空白字符(空格,换行等)或冒号或逗号
分隔.)
    #ldconfig
(#make uninstall卸载)

编译方法(源文件为test.c)：
    #gcc test.c -ggdb -I/usr/local/BerkeleyDB.4.6/include/ -L/usr/local/BerkeleyDB.4.6/lib/ -ldb -lpthread -o test.out

unix系统参考指南：http://www.oracle.com/technology/documentation/berkeley-db/db/ref/build_unix/solaris.html
BerkeleyDB参考资料：http://www.oracle.com/technology/documentation/berkeley-db/db/ref/toc.html

可使用如下程序测试_______________
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
//only this head should include for use bdb.
#include <db.h>
#define DATABASE "free.db"
#define DBLOCAT "/home/free/code/cc++/new"

int main()
{
    DB_ENV *myEnv;
    DB *dbp;
    DBT key, data;
    int ret,t_ret;
    u_int32_t env_flags;
    //........... Create an environment object and initialize it for error reporting
    ret = db_env_create(&myEnv, 0);
    if (ret != 0)
    {
        fprintf(stderr, "Error creating env handle: %s/n", db_strerror(ret));
        return -1;
    }
    //........If the environment does not exist create it. Initialize the in-memory cache.
    env_flags = DB_CREATE | DB_INIT_MPOOL;
    //........Open the environment.
    ret = myEnv->open(myEnv,DBLOCAT,env_flags,0);
    if (ret != 0)
    {
        fprintf(stderr, "Environment open failed: %s", db_strerror(ret));
        return -1;
    }

    if ((ret = db_create(&dbp, myEnv, 0)) != 0)
    {
        fprintf(stderr, "db_create: %s/n", db_strerror(ret));
        exit (1);
    }

    if ((ret = dbp->open(dbp, NULL, DATABASE, NULL, DB_BTREE, DB_CREATE, 0664)) != 0)
    {
        dbp->err(dbp, ret, "%s", DATABASE);
        exit (1);
    }
    memset(&key, 0, sizeof(key));
    memset(&data, 0, sizeof(data)); key.data = "sport";
    key.size = sizeof("sport");
    data.data = "football";
    data.size = sizeof("football");
    /*
    //......put data
    if ((ret = dbp->put(dbp, NULL, &key, &data, 0)) == 0)
    {
        printf("db: %s: key stored./n", (char *)key.data);
    }
    else
    {
        dbp->err(dbp, ret, "DB->put");
    }
    */

    //........put data NOOVERWRITE
    if ((ret = dbp->put(dbp, NULL, &key, &data, DB_NOOVERWRITE)) == 0)
        printf("db: %s: key stored./n", (char *)key.data);
    else
        dbp->err(dbp, ret, "DB->put");

    //.......get data
    if ((ret = dbp->get(dbp, NULL, &key, &data, 0)) == 0)
        printf("db: %s: key retrieved: data was %s./n", (char *)key.data, (char *)data.data);
    else
        dbp->err(dbp, ret, "DB->get");
     //......del data
    if((ret = dbp->del(dbp, NULL, &key, 0)) == 0)
        printf("db: %s: key was deleted./n", (char *)key.data);
    else
        dbp->err(dbp, ret, "DB->del");
    //.........close, only when the db successful closed,the data can real write to the disk.
    //if ((t_ret = dbp->close(dbp, 0)) != 0 && ret == 0)
    //ret = t_ret;
    //exit(ret);
    if (dbp != NULL)
        dbp->close(dbp, 0);
    //.........close evn
    //........When you are done with an environment, you must close it.
    //........Before you close an environment, make sure you close any opened databases
    if (myEnv != NULL)
        myEnv->close(myEnv, 0);
     return 0;
}