//先创建一个包名字为com.mchange.v2.log 必须为这个名
//写个Emp实体类 用来暂时存储用户输入的数据
package com.mchange.v2.log;
public class Emp {
    private int id;
    private String name;
    private int age;

    public Emp() {
    }

    public Emp(int id, String name, int age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }

    public int getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "Emp{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

//写一个工具类DBUtils 里面写一个方法getDateSource() 用来获取数据源
package com.mchange.v2.log;
import com.mchange.v2.c3p0.ComboPooledDataSource;
import javax.sql.DataSource;

public class DBUtils {
    public static DataSource getDateSource(){
        DataSource ds = new ComboPooledDataSource();
        return ds;
    }
}

//写一个员工数据访问类 用来访问数据库 进行增删改查
package com.mchange.v2.log;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import java.sql.SQLException;
import java.util.List;

public class EmpDaoImpl {
    private QueryRunner qr = new QueryRunner(DBUtils.getDateSource());
    public List<Emp> getAllEmp(){
        String sql="select * from emp1";
        List<Emp> list=null;
        try {
            list= qr.query(sql, new BeanListHandler<>(Emp.class));

        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
            return list;
        }
    public int addEmp(Emp emp){
        String sql="insert into emp1 values(?,?,?)";
        int rows=0;
        try {
            rows=qr.update(sql,emp.getId(),emp.getName(),emp.getAge());
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }if (rows>0){
            System.out.println("添加成功！");

            EmpDaoImpl empDao=new EmpDaoImpl();
            for (Emp e:empDao.getAllEmp()) {
                System.out.println(e);
            }
        }else {
            System.out.println("添加失败！");
        }
        return rows;
    }
    public int deleteEmp(int id){
        String sql="delete from emp1 where id=?";
        int rows=0;
        try {
            rows = qr.update(sql, id);
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        if (rows>0){
            System.out.println("删除成功！");
            EmpDaoImpl empDao=new EmpDaoImpl();
            for (Emp e:empDao.getAllEmp()) {
                System.out.println(e);
            }
        }else {
            System.out.println("删除失败！");
        }
        return rows;
    }
    public int updataEmp(Emp emp){
        String sql="update emp1 set name=?,age=? where id=?";
        int rows=0;
        try {
            rows = qr.update(sql, emp.getName(), emp.getAge(), emp.getId());
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        if (rows>0){
            System.out.println("修改成功！");

            EmpDaoImpl empDao=new EmpDaoImpl();
            for (Emp e:empDao.getAllEmp()) {
                System.out.println(e);
            }
        }else {
            System.out.println("修改失败！");
        }
        return rows;
    }
}

//写一个降低日志输出等级类
package com.mchange.v2.log;
import java.util.logging.Level;

public class AmendLogLevel {
    public static void amendInfoLevel(Level level){
        MLevel.INFO.level=level;
    }
}

//写个测试类 测试对员工数据进行增删改查
package com.mchange.v2.log;
import java.util.logging.Level;

public class Test {
    static {
        AmendLogLevel.amendInfoLevel(Level.ALL);
    }
    public static void main(String[] args) {
        EmpDaoImpl empDao=new EmpDaoImpl();
        empDao.addEmp(new Emp(6,"daming",24));
        //empDao.deleteEmp(4);
        //empDao.updataEmp(new Emp(6,"xiaoming",20));
        //empDao.getAllEmp();
        //empDao.deleteEmp(5);
    }
}

说明:此方法在网上某位大佬学到的。。。