berkeleyDB的安装

     下载的版本是berkeyleyDB.5.3,安装过程很简单：

    #../dist/configure  
    #make
    #make install

安装的默认目录是：/usr/local/BerkeleyDB.5.3

网上抄了个程序：

#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 "huerjia.db"

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,"/home/huerjia/db_test/testevn",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;
}

编译命令如下：

gcc bdb.c -ggdb -I /usr/local/BerkeleyDB.5.3/include/ -L /usr/local/BerkeleyDB.5.3/lib/ -ldb -lpthread -o bdb

运行后在目录中建立了几个二进制的文件，具体bdb的使用还要再看文档，再加研究.