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ÀûÓÃJena´æ´¢ÔÚOracleµÄÒ»¶Î³ÌÐò£¬¸ßÊÖÀͼݿ´Ò»Ï¡£ import java.util.*; import com.hp.hpl.jena.db.impl.DriverRDB; import com.hp.hpl.jena.db.*; import com.hp.hpl.jena.ontology.*; import com.hp.hpl.jena.rdf.model.*; public class WineOntologyPersistency {  public static final String Wine = "http://wine/";  public static final String DB_URL = "jdbc:oracle:oci:@";     public static final String DB_USER = "scott";     public static final String DB_PASSWD = "tiger";     public static final String DB = "Oracle";     public static final String DB_DRIVER = "oracle.jdbc.driver.OracleDriver";     static ModelMaker maker;    public static void main(String args[])  {   OntDocumentManager.getInstance().addAltEntry( Wine, "file:pizza.owl" );   try   {    Class.forName(DB_DRIVER);   }   catch(Exception e)   {    System.err.println( "Failed to load the driver for the database: " + e.getMessage() );             System.err.println( "Have you got the CLASSPATH set correctly?" );   }      try   {                          IDBConnection conn  = new DBConnection( DB_URL, DB_USER, DB_PASSWD,DB );                          conn.cleanDB();                          maker = ModelFactory.createModelRDBMaker( conn );         }         catch (Exception e)         {             e.printStackTrace();             System.exit( 1 );         }                  Model base = maker.createModel(Wine,false);                  OntModelSpec spec = new OntModelSpec(OntModelSpec.OWL_MEM);         spec.setImportModelMaker(maker);         OntModel m = ModelFactory.createOntologyModel(spec,base);                  m.read(Wine);                    } } ±àÒëûÓÐÎÊÌ⣬ÔËÐÐʱ³öÏÖ£º com.hp.hpl.jena.db.RDFRDBException: DriverRDB.cleanDB() failed to acquire databa se lock: (com.hp.hpl.jena.db.RDFRDBException: Failed to lock database after 5 attempts. .Try later or else call DriverRDB.unlockDB() after ensuring that no other Jena applications are using the database.) .Try again or call DriverRDB.unlockDB() if necessary.         at com.hp.hpl.jena.db.impl.DriverRDB.cleanDB(DriverRDB.java:985)         at com.hp.hpl.jena.db.DBConnection.cleanDB(DBConnection.java:150)         at WineOntologyPersistency.main(WineOntologyPersistency.java:37) ÎÒ²éÁËÒ»ÏÂJena 2 ¨C Frequently Asked Questions ¡¡ÆäÖÐÓÐÒ»¸öÎÊ´ðÊÇÕâÑùµÄ£º Q: Why am I getting an exception on failure to lock or unlock the database? A: The Jena2 storage subsystem uses a lock internally to implement a critical section for operations that modify the database structure (create/delete tables). The lock is implemented as a database table, i.e., if the table exists in the database, the lock is held. Normally, this lock should be transparent to applications. But if an application has an exception while in a critical section, the database may remain locked for subsequent applications. In this case, a user must manually unlock the database either by calling DriverRDB.unlockDB() or by deleting the table (Jena_Mutex) from the database. ¿´ÉÏÈ¥Òâ˼ÊÇ˵½â¾ö·½·¨»òÕßÊǵ÷Óà DriverRDB.unlockDB() »òÕßÊÇɾÁËJena_MutexÕâ¸ö±í£¬ÎÊÌâÊÇDriverRDB.unlockDB() Ó¦¸Ãʲôʱºòµ÷Óã¿Ð´ÔÚʲôµØ·½£¿unlockDB()ÊǾ²Ì¬·½·¨Â𣬿ÉÒÔÖ±½Óд³ÉDriverRDB.unlockDB() Âð£¿Jena2.3×Ô´øµÄJavaDocҲûÓÐDriverRDBÕâ¸öÀàµÄ˵Ã÷£¡ Èç¹û²ÉÓõڶþÖÖ·½·¨£¬È¥É¾³ýÄǸöJena_MutexÕâ¸ö±í£¬ÎÒÕÒÁËÒ»ÏÂÊý¾Ý¿âÀïûÓÐÕâ¸ö±í°¡£¿Õâ¸ö±í´æÔÚOracleÊý¾Ý¿âÀïʲôµØ·½°¡£¿ °¦£¬Ò»¶ÑÎÊÌ⣬Íû¸ßÊÖ¿´Ò»ÏÂÎÊÌâºÎÔÚ£¡Íò·Ö¸Ðл£¡    Êղؠ  ·ÖÏí   ¶¥(0)

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ÇëÎÊÂ¥Ö÷£¬ÎÒ×Ô¼ºÐ´µÄÒ»¸öÁ´½ÓoracleÊý¾Ý¿âµÄ³ÌÐòÔËÐеÄʱºòÀÏʦ˵£¬´íÎó´úÂëÈçÏ£ºDBerrorjava.sql.SQLException: Io Òì³£: SO Exception was generated at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:180) at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:222) at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:335) at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java:361) at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java:442) at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:321) at java.sql.DriverManager.getConnection(Unknown Source) at java.sql.DriverManager.getConnection(Unknown Source) at com.hp.hpl.jena.db.DBConnection.getConnection(DBConnection.java:122) at com.hp.hpl.jena.db.DBConnection.getDriver(DBConnection.java:283) at com.hp.hpl.jena.db.DBConnection.containsModel(DBConnection.java:226) at com.hp.hpl.jena.db.DBConnection.containsDefaultModel(DBConnection.java:239) at com.hp.hpl.jena.db.impl.GraphRDBMaker.getGraph(GraphRDBMaker.java:66) at com.hp.hpl.jena.rdf.model.impl.ModelMakerImpl.createDefaultModel(ModelMakerImpl.java:59) at com.dareway.cn.TestOracle.main(TestOracle.java:41) com.hp.hpl.jena.db.RDFRDBException: Failure to instantiate DB Driver:oracle java.sql.SQLException: Io Òì³£: SO Exception was generated at com.hp.hpl.jena.db.DBConnection.getDriver(DBConnection.java:296) at com.hp.hpl.jena.db.DBConnection.containsModel(DBConnection.java:226) at com.hp.hpl.jena.db.DBConnection.containsDefaultModel(DBConnection.java:239) at com.hp.hpl.jena.db.impl.GraphRDBMaker.getGraph(GraphRDBMaker.java:66) at com.hp.hpl.jena.rdf.model.impl.ModelMakerImpl.createDefaultModel(ModelMakerImpl.java:59) at com.dareway.cn.TestOracle.main(TestOracle.java:41) Caused by: java.sql.SQLException: Io Òì³£: SO Exception was generated at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:180) at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:222) at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:335) at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java:361) at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java:442) at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:321) at java.sql.DriverManager.getConnection(Unknown Source) at java.sql.DriverManager.getConnection(Unknown Source) at com.hp.hpl.jena.db.DBConnection.getConnection(DBConnection.java:122) at com.hp.hpl.jena.db.DBConnection.getDriver(DBConnection.java:283) ... 5 more Exception in thread "main" ÄúÖªµÀÕâ¸öÊÇʲôԭÒòÂ𣿠ÎҵijÌÐòÊÇ; import com.hp.hpl.jena.rdf.model.Model; import com.hp.hpl.jena.rdf.model.ModelFactory; import com.hp.hpl.jena.rdf.model.ModelMaker; public class TestOracle { /**   * @param args   * @throws ClassNotFoundException   */ public static void main(String[] args)  {   // TODO Auto-generated method stub   try {   String className = "oracle.jdbc.driver.OracleDriver";   // path of driver class         try {    Class.forName (className);   } catch (ClassNotFoundException e) {    // TODO Auto-generated catch block    e.printStackTrace();   }        // Load the Driver   String DB_URL="jdbc:oracle:thin:@10.2.0.70";                // URL of database   String DB_USER="hrserve";                              // database user id   String DB_PASSWD="hrserve";                              // database password   String DB="oracle";                            // database type //   Create database connection   IDBConnection conn = new DBConnection ( DB_URL, DB_USER, DB_PASSWD, DB );   ModelMaker maker = ModelFactory.createModelRDBMaker(conn) ;           //   create or open the default model   Model model = maker.createDefaultModel(); //System.out.print("³É¹¦ÁË°¡ £¬ºÇºÇ"+model.isEmpty()); //   Close the database connection       conn.close();   } catch (SQLException e) {    System.out.print("´íÎó½á¹ûÊÇ"+e.toString());    // TODO Auto-generated catch block    e.printStackTrace();       }       } }