老师，为什么我代码用name来查询的时候，就无法找到数据

package com.imooc.jdbc;

import java.sql.Connection;

import java.sql.ResultSet;

import java.sql.Statement;

import org.junit.Test;

import com.imooc.utils.JDBCutils;

public class JDBCDemo3 {

@Test

public void demo() {

Connection conn = null;

Statement st = null;

ResultSet rs = null;

try {

//获得连接

conn = JDBCutils.getConnection();

//创建并编写sql

String sql = "update goods set price = 5000 where name ='手机'";

st = conn.createStatement(); 

/* rs = st.executeQuery(sql);

while(rs.next()) {

int id = rs.getInt("id");

String name = rs.getString("name");

float price = rs.getFloat("price");

String desp = rs.getString("desp");

System.out.println(id + " " + name + " " + price + " " + desp);

}*/

int sum = st.executeUpdate(sql);

if(sum > 0) {

System.out.println("修改成功");

}

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

} finally {

JDBCutils.release(st, conn, rs);

}

}

}