leveldb-rocksdb java使用

Posted 76 months ago leveldb rocksdb nosql java linux

leveldb-rocksdb在java中的demo

（arangodb储存引擎用的rocksdb，然而rocksdb是在leveldb上开发来的）

rocksdb

package net.oschina.itags.gateway.service;
import org.rocksdb.Options;
import org.rocksdb.RocksDB;
import org.rocksdb.RocksDBException;

public class BaseRocksDb {
    public final static RocksDB rocksDB() throws RocksDBException {

        Options options = new Options().setCreateIfMissing(true);
        RocksDB.loadLibrary();
        RocksDB db=RocksDB.open(options,"./rock");
        return db;
    }
}

leveldb

package net.oschina.itags.gateway.service;
import org.iq80.leveldb.*;
import org.iq80.leveldb.impl.Iq80DBFactory;

import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;

public class BaseLevelDb {

public static final DB db() throws IOException {
    boolean cleanup = true;
    Charset charset = Charset.forName("utf-8");
    String path = "./level";

//init
    DBFactory factory = Iq80DBFactory.factory;
    File dir = new File(path);
//如果数据不需要reload，则每次重启，尝试清理磁盘中path下的旧数据。
    if(cleanup) {
        factory.destroy(dir,null);//清除文件夹内的所有文件。
    }
    Options options = new Options().createIfMissing(true);
//重新open新的db
    DB db = factory.open(dir,options);
  return db;
}
}

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