封装一个 员工类 使用preparedStatement 查询数据 （2） 使用 arrayList 集合

创建 员工=类生成   有参构造   get    set 方法  toString 方法

package cn.hph;

public class emp1 {
    //创建员工类的属性
   private  int id;
   private String ename;
   private int Job_id;
   private int mgr;
   private String  Joindate;
   private Double salary;
   private Double bonus;
   private int dept_id;
    //生成get     set 方法
    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getEname() {
        return ename;
    }

    public void setEname(String ename) {
        this.ename = ename;
    }

    public int getJob_id() {
        return Job_id;
    }

    public void setJob_id(int job_id) {
        Job_id = job_id;
    }

    public int getMgr() {
        return mgr;
    }



    public void setMgr(int mgr) {
        this.mgr = mgr;
    }

    public String getJoindate() {
        return Joindate;
    }

    public void setJoindate(String joindate) {
        Joindate = joindate;
    }

    public Double getSalary() {
        return salary;
    }

    public void setSalary(Double salary) {
        this.salary = salary;
    }

    public Double getBonus() {
        return bonus;
    }

    public void setBonus(Double bonus) {
        this.bonus = bonus;
    }

    public int getDept_id() {
        return dept_id;
    }

    public void setDept_id(int dep_id) {
        this.dept_id = dep_id;
    }

    //生成有参构造
    public emp1(int id, String ename, int job_id, int mgr, String joindate, Double salary, Double bonus, int dept_id) {
        this.id = id;
        this.ename = ename;
        Job_id = job_id;
        this.mgr = mgr;
        Joindate = joindate;
        this.salary = salary;
        this.bonus = bonus;
        this.dept_id = dept_id;
    }
//生成toString 方法
    public String toString() {
        return "id=" + id +
                ", ename='" + ename + '\'' +
                ", Job_id=" + Job_id +
                ", mgr=" + mgr +
                ", Joindate='" + Joindate + '\'' +
                ", salary=" + salary +
                ", bonus=" + bonus +
                ", dep_id=" + dept_id;
    }
}

使用ArrayList集合查询表中的数据

package cn.hph;

import jdbcUtil.JdbcUtil;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;

public class ArrayListSelect {
    public static void main(String[] args){
        //创建ArrayList 集合
        ArrayList<emp1> arr= new ArrayList<emp1>();
        try {
            //调用Jdbc 工具类
            Connection conn = JdbcUtil.getConnection();
            //获得 preparedStatement 方法
            PreparedStatement pre   = conn.prepareStatement("select * from emp");
            //执行sql语句
            ResultSet rs = pre.executeQuery();
            while(rs.next()) {
                //员工表的属性添加到集合中
                arr.add(new emp1(rs.getInt("id"), rs.getString("ename"), rs.getInt("job_id"), rs.getInt("mgr"), rs.getString("joindate"), rs.getDouble("salary"), rs.getDouble("bonus"), rs.getInt("dept_id")));
            }
            //使用增强for循环遍历
            for(emp1 m:arr){
                System.out.println(m.toString());
            }
            // 关闭流
            JdbcUtil.close(pre,conn);
        } catch (SQLException e) {
            e.printStackTrace();
        }

    }
}