// Put stores an item in database dbi.
//
// See mdb_put.
func (txn *Txn) Put(dbi DBI, key []byte, val []byte, flags uint) error {
kn := len(key)
if kn == 0 {
return txn.putNilKey(dbi, flags)
}
vn := len(val)
if vn == 0 {
val = []byte{0}
}
ret := C.lmdbgo_mdb_put2(
txn._txn, C.MDB_dbi(dbi),
(*C.char)(unsafe.Pointer(&key[0])), C.size_t(kn),
(*C.char)(unsafe.Pointer(&val[0])), C.size_t(vn),
C.uint(flags),
)
return operrno("mdb_put", ret)
}
func (txn *Txn) putNilKey(dbi DBI, flags uint) error {
// mdb_put with an empty key will always fail
ret := C.lmdbgo_mdb_put2(txn._txn, C.MDB_dbi(dbi), nil, 0, nil, 0, C.uint(flags))
return operrno("mdb_put", ret)
}