Berkeley DB 使用实例

如下：

import java.io.File;
import java.util.SortedMap;

import com.sleepycat.bind.serial.ClassCatalog;
import com.sleepycat.bind.serial.SerialBinding;
import com.sleepycat.bind.serial.StoredClassCatalog;
import com.sleepycat.bind.tuple.TupleBinding;
import com.sleepycat.collections.StoredSortedMap;
import com.sleepycat.je.Database;
import com.sleepycat.je.DatabaseConfig;
import com.sleepycat.je.Environment;
import com.sleepycat.je.EnvironmentConfig;


public class Test {
	public static void main(String[] args) {
		EnvironmentConfig envConfig = new EnvironmentConfig();
		envConfig.setTransactional(false);
		envConfig.setAllowCreate(true);
		Environment env = new Environment(new File("./bdb/"), envConfig);
		DatabaseConfig dbConfig = new DatabaseConfig();
		dbConfig.setTransactional(false);
		dbConfig.setAllowCreate(true);
		
		// 如果有序列化绑定则需要类别数据库
		Database catalogDb = env.openDatabase(null, "catalog", dbConfig);
		ClassCatalog catalog = new StoredClassCatalog(catalogDb);
		
		// 关键字类型是字符串
		TupleBinding<String> keyBinding = TupleBinding.getPrimitiveBinding(String.class);
		
		// 值数据类型也是字符串
		SerialBinding<String> dataBinding = new SerialBinding<String>(catalog, String.class);
		
		Database db = env.openDatabase(null, "url", dbConfig);
		
		// 创建一个映射
		SortedMap<String, String> map = new StoredSortedMap<String, String>(db, keyBinding, dataBinding, true);
		String url = "http://www.baidu.com";
		map.put(url, "123");
		if (map.containsKey(url)) {
			System.out.println("已抓取");
		}
		map.remove(url);
		if (!map.containsKey(url)) {
			System.out.println("已删除");
		}
	}
}