java - Berkeley JE StoredMap：替换现有值而不加载前一个

Question

我想更新一个 StoredMap 值，我不关心旧值。我找不到避免加载先前值的方法。

StoredMap<Integer, SyntaxDocument> tsCol = new StoredMap<Integer, SyntaxDocument>(tsdb, new IntegerBinding(), new PassageBinding(), true);
tsCol.put(1, doc); // insert value => ok
tsCol.put(1, doc); // <- load previous value but I don't care. I want to avoid the "heavy" PassageBinding process.
tsCol.putAll(Collections.singletonMap(1, doc)); // Even this one load the old value

有没有办法优化我的代码并更新现有值而不加载它（或至少防止绑定以处理旧的 DatabaseEntry 字节）？

注意：调用 remove 然后 put 更慢。

Answer 1

解决方案是使用低级数据库 API：

Database tsdb = environment.openDatabase(null, "tsdb", dbconfig);
PassageBinding binding = new PassageBinding();
DatabaseEntry idDbEntry = new DatabaseEntry();

IntegerBinding.intToEntry(id, idDbEntry);
DatabaseEntry dbEntry = new DatabaseEntry();
pb.objectToEntry(data, dbEntry);

tsdb.put(null, idDbEntry, dbEntry); // <-- replace existing value without loading it.