c - BerkeleyDB doesn't store files -

i starting use berkeleydb. wrote following method insert values database:

void put(int key, int value){     db *dbp;     int ret;      if((ret=db_create(&dbp,null,0))!=0){         fprintf(stderr,"db_create failed: %s\n",db_strerror(ret));         exit(1);     }     ret=dbp->open(         dbp,         null,         "berkeley.db",         null,         db_btree,         db_create,         0     );      dbt bin_key, bin_value;     memset(&bin_key,0,sizeof(dbt));     memset(&bin_value,0,sizeof(dbt));      bin_key.data=&key;     bin_value.data=&value;      bin_key.size=sizeof(int);     bin_value.size=sizeof(int);      if((ret=dbp->put(dbp, null, &bin_key, &bin_value, db_nooverwrite))!=0){         printf("put failed");     };     return; } 

after calling put() method, no errors. dumping database tool dump_db berkeley.db gets database. has been created, still there no values in database.

any idea?

in case don't close database before exiting program, might want that, example, @ end of put() function:

if(dbp->close(dbp, 0)) != 0) {     printf("close failed\n"); } 

it might data put database added cache , not written disk. in case function close() needs called in order flush data disk:

description

the db->close function flushes cached database information disk, closes open cursors, frees allocated resources, , closes underlying files. because key/data pairs cached in memory, failing sync file db->close or db->sync function may result in inconsistent or lost information.