cursorPut method

Future<void> cursorPut(Pointer<MDB_cursor> cursor, List<int> key, List<int> value, int flags,)

Stores data at current cursor position

Parameters:

• cursor - Active cursor
• key - Key to store
• value - Value to store
• flags - Optional operation flags

Example:

await db.cursorPut(
  cursor,
  utf8.encode('key'),
  utf8.encode('value'),
  0
);

Implementation

Future<void> cursorPut(
  Pointer<MDB_cursor> cursor,
  List<int> key,
  List<int> value,
  int flags,
) async {
  final keyPtr = calloc<Uint8>(key.length);
  final valuePtr = calloc<Uint8>(value.length);

  try {
    final keyList = keyPtr.asTypedList(key.length);
    keyList.setAll(0, key);

    final valueList = valuePtr.asTypedList(value.length);
    valueList.setAll(0, value);

    return _withAllocated<void, MDB_val>((keyVal) {
      return _withAllocated<void, MDB_val>((dataVal) {
        keyVal.ref.mv_size = key.length;
        keyVal.ref.mv_data = keyPtr.cast();

        dataVal.ref.mv_size = value.length;
        dataVal.ref.mv_data = valuePtr.cast();

        final result = _lib.mdb_cursor_put(
          cursor,
          keyVal,
          dataVal,
          flags,
        );

        if (result != 0) {
          throw LMDBException('Failed to put cursor data', result);
        }
      }, calloc<MDB_val>());
    }, calloc<MDB_val>());
  } finally {
    calloc.free(keyPtr);
    calloc.free(valuePtr);
  }
}