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Connecting Your Jena Program to Oracle Jena supports both memory models and database models. In general, a Jena program may use both types of models identically. However, there are some differences in how the models are created. Creating a memory model can be done with a single Jena call. Creating a database model, or opening a previously created one, requires several steps as as follows. Important: Edit the source file com.hp.hpl.jena.db.impl.Driver_Oracle.java. Uncomment the Oracle import commands at the top of the file: import oracle.jdbc.OracleResultSet; import oracle.sql.BLOB; Comment-out the stubbed-out interfaces named BLOB and OracleResultSet. Load the JDBC driver. This enables the Jena program to communicate with the database instance. Create a database connection. This creates a Java object for a database connection. Create or open a model on the connection. This connects to the database and creates an empty model or opens a previously created model. Steps 2-4 are illustrated in the following Java code. // Load the Driver String className = "oracle.jdbc.driver.DriverOracle" // path of driver class Class.forName (className); // load driver String DB_URL = "jdbc:oracle:oci:@"; // URL of database server String DB_USER = "scott"; // database user id String DB_PASSWD = "tiger"; // database password String DB = "Oracle"; // database type // Create database connection IDBConnection conn = new DBConnection ( URL, DB_USER, DB_PASSWD, DB ); // Create a model in the database ModelMaker maker = ModelFactory.createModelRDBMaker(conn); ModelRDB m = (ModelRDB) maker.createModel (); < your Jena code to work with the model goes here > // Remove the model. NOTE: this deletes the model from the database. // Subsequent attempts to open this model will fail. m.remove();// NOTE: remove deletes the model from the database // Close the database connection conn.close(); // Alternative to creating an unnamed model ... // Create a named model ModelRDB m = maker.createModel("myName"); ... later, or in another Jena application ... // Open a named model. ModelRDB m = maker.openModel("myName");

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thanks very much, i've learnd vey much

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