知识大全 C#使用BerkeleyDB操作简介[5]

Posted 2022-07-16 操作

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keyStream Position = ; formatter Serialize(keyStream put Key); DbEntry key = DbEntry InOut(keyStream GetBuffer() (int)keyStream Position); dataStream Position = ; formatter Serialize(dataStream put); DbEntry data = DbEntry InOut(dataStream GetBuffer() (int)dataStream Position); WriteStatus status = btree Put(txn ref key ref data); switch (status) case WriteStatus Success: return true; case WriteStatus NotFound: case WriteStatus KeyExist: default: return false; private bool isit = false; public void Commit() txn Commit(Txn CommitMode None); isit = true; public List<IPut> Find() List<IPut> custList = new List<IPut>(); using (DbBTreeCursor cursor = btree OpenCursor(txn DbFileCursor CreateFlags None)) IPut cust = null; while (GetNextRecord(cursor ref cust)) custList Add(cust); return custList; public bool Get(ref IPut put) keyStream Position = ; formatter Serialize(keyStream put Key); DbEntry key = DbEntry InOut(keyStream GetBuffer() (int)keyStream Position); dataStream SetLength(dataStream Capacity); DbEntry data = DbEntry Out(dataStream GetBuffer()); while (true) ReadStatus status = btree Get(txn ref key ref data DbFile ReadFlags None); switch (status) case ReadStatus Success: dataStream Position = ; dataStream SetLength(data Size); put = (IPut)formatter Deserialize(dataStream); return true; case ReadStatus BufferSmall: //扩容 if (key Buffer Length < key Size) keyStream SetLength(key Size); key = DbEntry Out(keyStream GetBuffer()); if (data Buffer Length < data Size) dataStream SetLength(data Size); data = DbEntry Out(dataStream GetBuffer()); continue; case ReadStatus NotFound: case ReadStatus KeyEmpty: default: return false; cha138/Article/program/net/201311/14801