Java DB, the Oracle open source database

Java DB is a full-featured, easy-to-use, open source database which is the Apache Derby open source database included in the java JDK starting version 5.

DBMS or Vendor: derby
Driver: org.apache.derby.jdbc.EmbeddedDriver
URL: when it is used before the database is created, the URL is jdbc:derby:<database name>;create=true, afterwards, the URL is simply  jdbc:derby:<database name>

You need to include the jars in the <java home>\db\lib directory in your project classpath for using the database.

Following is a sample code of using the Java DB.

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class JavaDBTest {
    private Connection conn = null;
    private boolean databaseCreated = false;
 
    private void createDatabase()
            throws ClassNotFoundException, SQLException {
        Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
        conn = DriverManager.getConnection(
                        "jdbc:derby:testDB;create=true");
        databaseCreated = true;
    }
 
    public Connection getConnection()
            throws ClassNotFoundException, SQLException{
        if (conn != null) return conn;
     
        if (databaseCreated) {
            Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
            conn = DriverManager.getConnection(
                        "jdbc:derby:testDB");
        } else {
            createDatabase();
        }
        return conn;
    }
    public static void main(String[] args){
        JavaDBTest test = new JavaDBTest();
        try {
            Connection connection = test.getConnection();
         
            DatabaseMetaData dmd = connection.getMetaData();
            System.out.println(dmd.getDriverName());
         
            Statement statement = connection.createStatement();
            statement.execute("create table fruit (name varchar(30), value varchar(20))");
            statement.executeUpdate("insert into fruit values ('Apple', '100')");

            ResultSet result = statement.executeQuery("select * from fruit");
            while(result.next()){
                System.out.println("name="+result.getString(1));
                System.out.println("value="+result.getString(2));
            }
            result.close();
            statement.close();
            connection.close();
        }catch(Exception e){
            e.printStackTrace();
        }
     
    }
}

References:
1.Java DB
2. Working with Java DB in NetBeans

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