[lmdb] mdb_stat with named databases

[JK <jkal@posteo.eu>]

Hi,

should using 'mdb_stat' in c work with named databases?
In my test, when using 'mdb_dbi_open' with a string name and inserting 
some data, 'mdb_stat' sets all 'MDB_stat' values to zero.
Using an unnamed database or the 'mdb_stat' command-line utility returns 
expected values.
I'm using the gitorius mdb version, commit e7f6767, on linux 3.9.4.

Thanks for any insights.


relevant code (generated)
----
#include <stdio.h>
#include <lmdb.h>
#define s(arg) 
status=arg;if(!(MDB_SUCCESS==status)){puts(mdb_strerror(status));return(status);}
int status;
MDB_env* env;
int main() {
    MDB_stat stat;
    int data;
    MDB_val val;
    MDB_txn* txn;
    MDB_dbi dbi;
    s(mdb_env_create(&env));
    s(mdb_env_set_maxdbs(env,10u));
    s(mdb_env_set_maxreaders(env,3u));
    s(mdb_env_open(env,"/tmp/mdb",0u,384u));
    s(mdb_txn_begin(env,0u,0u,&txn));

    s(mdb_dbi_open(txn,"testdb",MDB_CREATE,&dbi));

    val.mv_size=sizeof(int);
    val.mv_data=&data;
    data=123u;
    s(mdb_put(txn,dbi,&val,&val,0u));
    data=124u;
    s(mdb_put(txn,dbi,&val,&val,0u));
    data=125u;
    s(mdb_put(txn,dbi,&val,&val,0u));
    s(mdb_txn_commit(txn));
    s(mdb_txn_begin(env,0u,MDB_RDONLY,&txn));
    s(mdb_stat(txn,dbi,&stat));
    mdb_txn_abort(txn);
    printf("ms-entries: %lu\nms-depth: 
%lu\n",stat.ms_entries,stat.ms_depth);
    mdb_env_close(env);
    return(0);
}
----