DB open(const DBEnv &env, const DBTxn &txn, const char *fname, const char *dbname, DBTYPE dbtype, uint32_t flags, int mode) const {
::DB *db;
int r = db_create(&db, env.env(), 0);
handle_ft_retval(r);
if (_readpagesize) {
r = db->set_readpagesize(db, _readpagesize);
handle_ft_retval(r);
}
if (_compression_method >= 0) {
r = db->set_compression_method(db, TOKU_COMPRESSION_METHOD(_compression_method));
handle_ft_retval(r);
}
if (_fanout) {
r = db->set_fanout(db, _fanout);
handle_ft_retval(r);
}
if (_memcmp_magic) {
r = db->set_memcmp_magic(db, _memcmp_magic);
handle_ft_retval(r);
}
if (_pagesize) {
r = db->set_pagesize(db, _pagesize);
handle_ft_retval(r);
}
const DBTxn *txnp = &txn;
DBTxn writeTxn;
if (txn.is_read_only()) {
writeTxn = DBTxn(env, DB_SERIALIZABLE);
txnp = &writeTxn;
}
r = db->open(db, txnp->txn(), fname, dbname, dbtype, flags, mode);
handle_ft_retval(r);
if (!_descriptor.empty()) {
DBT desc = _descriptor.dbt();
r = db->change_descriptor(db, txnp->txn(), &desc, DB_UPDATE_CMP_DESCRIPTOR);
handle_ft_retval(r);
}
if (txn.is_read_only()) {
writeTxn.commit();
}
return DB(db, true);
}
DBC::DBC(const DBEnv &env, const DBTxn &txn)
: _txn(),
_dbc(nullptr)
{
if (env.env() != nullptr) {
DB_TXN *txnp = txn.txn();
if (txnp == nullptr) {
_txn = DBTxn(env, DB_TXN_READ_ONLY | DB_READ_UNCOMMITTED);
txnp = _txn.txn();
}
::DBC *c;
int r = env.env()->get_cursor_for_directory(env.env(), txnp, &c);
handle_ft_retval(r);
_dbc = c;
}
}
DBC::DBC(const DB &db, const DBTxn &txn, int flags)
: _txn(),
_dbc(nullptr)
{
if (db.db() != nullptr) {
DB_TXN *txnp = txn.txn();
if (txnp == nullptr) {
_txn = DBTxn(DBEnv(db.db()->dbenv), DB_TXN_READ_ONLY | DB_READ_UNCOMMITTED);
txnp = _txn.txn();
}
::DBC *c;
int r = db.db()->cursor(db.db(), txnp, &c, flags);
handle_ft_retval(r);
_dbc = c;
}
}
