// 1.加载驱动程序

 Class.forName("oracle.jdbc.driver.OracleDriver");

 // 2.获取数据库连接

 Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl", "j0408", "1");

 // 3.构建SQL语句

 String sql = "insert into t_user(userid,username,password)values(seq_t_user.nextval,'abc','123456')";

 // 4.执行SQL语句

 Statement sts = conn.createStatement();

 // 返回的结果是影响的行数

 int count = sts.executeUpdate(sql);

 System.out.println("影响的行数："+count);

 // 5.关闭资源

 sts.close();

 conn.close();