四、BDB JE學習(對java中內置對象的存儲)

 對不同類型的數據處理

DatabaseEntry來綁定基本的JAVA數據類型，主要有String、Character、Boolean、Byte、Short、Integer、Long、Float、Double.

還是要在你的D盤中創建bdb文件夾。

例子:

 

package test;
import java.io.File;
import java.io.UnsupportedEncodingException;
import com.sleepycat.bind.EntityBinding;
import com.sleepycat.bind.EntryBinding;
import com.sleepycat.bind.tuple.LongBinding;
import com.sleepycat.bind.tuple.TupleBinding;
import com.sleepycat.je.Database;
import com.sleepycat.je.DatabaseConfig;
import com.sleepycat.je.DatabaseEntry;
import com.sleepycat.je.DatabaseException;
import com.sleepycat.je.Environment;
import com.sleepycat.je.EnvironmentConfig;
import com.sleepycat.je.EnvironmentLockedException;
import com.sleepycat.je.LockMode;
import com.sleepycat.je.OperationStatus;
/**
 * 對java中的內置對象的存儲
 * @author Administrator
 *
 */
public class MyTest {
 public static void main(String[] args) {
  Environment env=null;
  Database db = null;
  EnvironmentConfig envconfig=new EnvironmentConfig();
  envconfig.setAllowCreate(true);
  try {
   env=new Environment(new File("D://bdb"),envconfig);
   DatabaseConfig dbconfig=new DatabaseConfig();
   dbconfig.setAllowCreate(true);
   db=env.openDatabase(null, "dbac.db", dbconfig);
   String key="mykey";
   DatabaseEntry thekey=new DatabaseEntry();
   thekey.setData(key.getBytes("utf-8"));

   Long value=new Long(123456);
   DatabaseEntry thevalue=new DatabaseEntry();
   EntryBinding myBinging=TupleBinding.getPrimitiveBinding(Long.class);
   myBinging.objectToEntry(value, thevalue);
   //LongBinding myLongBinging=(LongBinding)TupleBinding.getPrimitiveBinding(Long.class);
   //myLongBinging.objectToEntry(value, thevalue);
   db.put(null, thekey, thevalue);
   DatabaseEntry valueEntry = new DatabaseEntry();
   OperationStatus status= db.get(null, thekey, valueEntry, LockMode.DEFAULT);
   if(status==OperationStatus.SUCCESS){
    //Long number=myLongBinging.entryToObject(valueEntry);
    Long number=(Long) myBinging.entryToObject(valueEntry);
    System.out.println(env.getDatabaseNames());
    System.out.println(number);
   }
  } catch (EnvironmentLockedException e) {
   e.printStackTrace();
  } catch (Exception e) {
   e.printStackTrace();
  } finally{
   if(db!=null){
    try {
     db.close();
    } catch (DatabaseException e) {
     e.printStackTrace();
    }
   }
   if(env!=null){
    try {
     env.cleanLog();
     env.close();
    } catch (DatabaseException e) {
     e.printStackTrace();
    }
   }
  }
 }
}