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#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 "yangjian.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;
}