再次深入探索datasource问题？

Connection conn = null;
Statement st = null; // 用于执行SQL语句的对象，当然还有其他的对象也可以用于执行SQL语句

try {

Class.forName("oracle.jdbc.driver.OracleDriver");// 加载数据库驱动包，这里是Oracle的驱动包

conn = DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:orcl","scott","scott");

// url 连接数据库的地址类似的如：

//"jdbc:mysql://localhost/test?user=root&password=root&useUnicode=true&&characterEncoding=gb2312&autoReconnect = true";

//简单写法：url = //"jdbc:myqsl://localhost/test(数据库名)? user=root(用户)&password=root(密码)";

String name = in.next();
String date = in.next();
String sql = "update student set stu_name=‘"+name+"‘,stu_birthday=to_date(‘"+date+"‘,‘yyyy-mm-dd‘) where stu_id=7";
System.out.println(sql);

st = conn.createStatement();

int num = st.executeUpdate(sql);
if(num>0){
System.out.println("修改成功");
}

} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{

try {
if(st!=null)
st.close();

if(conn!=null)
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}
System.out.println("程序结束");

}