在嵌入式Linux上实现BerkeleyDB数据库

mistyrain

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在嵌入式Linux上实现BerkeleyDB数据库
Author:
misty(qibing83@yahoo.com.cn)
Berkeley DB原是Sleepycat软件公司的产品，现被Oracle收购。Berkeley DB使用简单的接口来完成所有数据库的操作，而不是使用SQL语言。
1.1      
下载及安装
到Oracle网站上下载版本db-4.4.20.NC.tar.gz，解压后，到目录build-unix下，运行
#../dist/configure –prefix=/home/qibing/opt
#make
#make install
则库文件和头文件安装在目录/home/qibing/opt下，要完全删除运行 #make realclean即可。
1.2      
实现及验证
建立文件berkeley.c，并使用下面命令编译
#gcc –I/home/qibing/opt/inclue –L/home/qibing/opt/lib
–o Berkeley Berkeley.c –ldb-4.4

Berkeley.c
#include
#include
#include
#include
//only this head should
include for use bdb.
#include   
#define DATABASE
"demo.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/yangbin1/yangjian/my/db/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;
}
End of Berkeley.c
编译好后，运行./berkeley即可。 附件为本文中的代码（这个代码我未具体验证）


  
  
  
  
  
  
  
  
  
  
  
  





       
        文件:berkeley.rar
        大小:1KB
        下载:
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参考：http://www.cnblogs.com/huqingyu/archive/2006/10/06/522251.html
在嵌入式上实现时，用交叉编译gcc编译并把库放在目标板上。
               
               
               

本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u2/70351/showart_1003349.html