spring.jpa.database-platform=org.hibernate.dialect.Oracle10gDialect
spring.datasource.url=jdbc:oracle:thin:@localhost:1521:XE
spring.datasource.username=talon
spring.datasource.password=talon

@Configuration
public class Db {

    @NotNull
    private String username;
    @NotNull
    private String password;
    @NotNull
    private String url;

    public void setUsername(String username) {
        this.username = username;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public Db() {
        OracleDataSource dataSource = null;
        try {
            dataSource = new OracleDataSource();
            dataSource.setUser(username);
            dataSource.setPassword(password);
            dataSource.setURL(url);
            dataSource.setImplicitCachingEnabled(true);
            dataSource.setFastConnectionFailoverEnabled(true);
            Connection connection = dataSource.getConnection();
            Statement statement = connection.createStatement();
            ResultSet rs = statement.executeQuery("select * from BOOK");
            rs.next();
            System.out.println(rs.getString(2));
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

}