记录一哈，我的刚开始学习的JDBC_Dawn

 主方法类

package com.hare.domain;

import java.sql.*;
import java.util.ArrayList;
import java.util.List;

public class EmpTestJDBC {

    public static void main(String[] args) {
        List<Emp> emps = new EmpTestJDBC().finaAll();
        System.out.println(emps);
        System.out.println(emps.size());
    }

    public List<Emp> finaAll(){
        Connection conn =null;
        Statement stmt = null;
        ResultSet rs = null;
        List<Emp> list  = null;
        try {
            //1.注册驱动
            Class.forName("com.mysql.jdbc.Driver");
            //2.连接数据库
            conn = DriverManager.getConnection("jdbc:mysql:///db3", "root", "123456");
            //3.获取sql的Statement对象
            stmt = conn.createStatement();
            //4.创建sql语句
            String sql = "select * from emp";
            //5.获取ResultSet对象
            rs = stmt.executeQuery(sql);
            //6.开始执行sql 语句
            Emp emp = null;
            list  = new ArrayList<Emp>();
            while(rs.next()){
                int id = rs.getInt("id");
                String ename = rs.getString("ename");
                int job_id = rs.getInt("job_id");
                int mgr = rs.getInt("mgr");
                Date joindate = rs.getDate("joindate");
                double salary = rs.getDouble("salary");
                double bonus = rs.getDouble("bonus");
                int dept_id = rs.getInt("dept_id");
                emp=new Emp();
                emp.setId(id);
                emp.setEname(ename);
                emp.setJob_id(job_id);
                emp.setMgr(mgr);
                emp.setJoindate(joindate);
                emp.setSalary(salary);
                emp.setBonus(bonus);
                emp.setDept_id(dept_id);

                list.add(emp);
            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }finally{
            if(rs!=null){
                try {
                    rs.close();
                } catch (SQLException throwables) {
                    throwables.printStackTrace();
                }
            }
            if(stmt!=null){
                try {
                    stmt.close();
                } catch (SQLException throwables) {
                    throwables.printStackTrace();
                }
            }
            if(conn!=null){
                try {
                    conn.close();
                } catch (SQLException throwables) {
                    throwables.printStackTrace();
                }
            }
        }
        return list;
    }

}
package com.hare.domain;

import java.s