java

java任务17

今天在学习DAO，看了一下午都没有搞懂什么是一个DAO，脑子里的没有任何概念。但是学习到了

如何是一个类，定义一个类型很多，我用的都是long型，还有些是String型的，我学习到了用set和get的用法。这样做是为了封装，提高安全性。个人感觉这样的方法写代码可以减少好多好长的代码。

package DAO;

/**
 * Created by PC on 2017/6/10.
 */
public class Person {
    private  Long id;
    private Long name;
    private Long qq;
    private Long jobs;
    private Long join_time;
    private Long school;
    private Long online_id;
    private Long data_url;
    private Long declaration;
    private Long sourrces;
    public long getId(){
        return id;
    }
    public void setId(long id){
        this.id = id;
    }
    public  long getName(){
        return name;
    }
    public  void setName(Long name) {
        this.name = name;
    }
    public long getQq(){
        return qq;
    }
    public void setQq(Long qq){
        this.qq = qq;
    }
    public long getJobs(){
        return jobs;
    }
    public void setJobs(Long jobs){
        this.jobs = jobs;
    }
    public long getJoin_time(){
        return join_time;
    }
    public void setJoin_time(Long join_time){
        this.join_time = join_time;
    }
    public long getSchool(){
        return school;
    }
    private void setSchool(Long school){
        this.school = school;
    }
    public long getOnline_id(Long online_id){
        return online_id;
    }
    public void setOnline_id(){
        this.online_id = online_id;
    }
    public long getData_url(){
        return data_url;
    }
    public void setData_url(Long data_url){
        this.data_url = data_url;
    }
    public long setDeclaration(){
        return declaration;
    }
    public void getDeclaration(Long declaration){
        this.declaration = declaration;
    }
    public long getSourrces(){
        return sourrces;
    }
    public void setSourrces(Long sourrces){
        this.sourrces = sourrces;
    }
    public Person(long id,long name,long qq,long jobs,long join_time,long school,long online_id,
                  long data_url,long declaration,long sourrces){
        super();
        this.id = id;
        this.name = name;
        this.qq = qq;
        this.jobs = jobs;
        this.join_time = join_time;
        this.school = school;
        this.online_id = online_id;
        this.data_url = data_url;
        this.declaration = declaration;
        this.sourrces = sourrces;
    }
    public Person(long name,long qq,long jobs,long join_time,long school,long online_id,
                  long data_url,long declaration,long sourrces){
        super();
        this.name = name;
        this.qq = qq;
        this.jobs = jobs;
        this.join_time = join_time;
        this.school = school;
        this.online_id = online_id;
        this.data_url = data_url;
        this.declaration = declaration;
        this.sourrces = sourrces;
}
     public Person(){
    super();
    }
    public String toLong() {
     return "Person [id="+ id + ",name="+ name + ",qq="+ qq + ",jobs="+ jobs + ",join_time="+ join_time + ",school="+ school + ",online_id="+ online_id + ",data_.url="+ data_url + ",declaration="+ declaration + ",sourrces="+ sourrces + "]";

     }


}

但是报错，运行的时候报错报一个很奇怪的东西

这一个东西很奇怪的。没有看过这个。不知道什么意思，应该是我想实现DAO层缺少了某块吧，但是依然没有搜索出来原因，今天就很难的完成了这两样东西。对于我来说还是很难得。明天咨询师兄从哪里入手更简单一点。

明天计划的事情：找出DAO的问题所在，把DAO编写好

今天遇到的问题：

    1.找不到或无法加载主类 JDBCtest？

       未解决

    2.@Override在对代码加上这个后，报错，这个报错其实一直存在的。无论我加与不加都不行

    未解决

    3.无法找到DAO层的最简单的结构

今天最好的收获就是学会用了一下get set的方法。