(粗糙版)DeptDao,Service

DeptDao

package com.javasm.dao;

import com.javasm.bean.Dept;
import com.javasm.util.JDBCUtils;

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

/**
 * @Author：Zxb
 * @Version：1.0
 * @Date：2022/12/12-14:37
 * @Since：jdk1.8
 * @Description：
 */
public class DeptDao {

    /**
     * 添加部门
     *
     * @param dept
     * @return 返回受影响行数
     */
    public int addDept(Dept dept) {
        int i = 0;
        //准备sql
        String sql = "insert into tb_department values(?,?)";
        //获取数据库连接对象
        Connection connection = JDBCUtils.getConnection();
        PreparedStatement statement = null;
        //先判断
        if (JDBCUtils.isConnection(connection)) {
            try {
                //获取执行对象
                statement = connection.prepareStatement(sql);
                statement.setInt(1, dept.getDeptId());
                statement.setString(2, dept.getDeptName());
                //发送语句并执行
                i = statement.executeUpdate();
            } catch (SQLException e) {
                e.printStackTrace();
            } finally {
                //资源回收
                JDBCUtils.close(connection, statement);
            }
        }
        return i;
    }

    /**
     * 根据id删除部门
     *
     * @param id
     * @return 受影响行数
     */
    public int deleteDeptById(int id) {
        int i = 0;
        String sql = "delete from tb_department where dept_id=?";
        //获取数据库连接对象
        Connection connection = JDBCUtils.getConnection();
        //执行对象
        PreparedStatement statement = null;
        //先判断
        if (JDBCUtils.isConnection(connection)){
            try {
                //获取执行对象
                statement = connection.prepareStatement(sql);
                //解决参数
                statement.setInt(1, id);
                //执行
                i = statement.executeUpdate();
            } catch (SQLException e) {
                e.printStackTrace();
            } finally {
                JDBCUtils.close(connection, statement);
            }
        }

        //返回受影响行数
        return i;
    }

    /**
     * 修改
     *
     * @param dept
     * @return 返回收影响行数
     */
    public int updateDept(Dept dept) {
        int i = 0;
        String sql = "update tb_department set dept_name=? where dept_id=?";
        //获取连接对象
        Connection connection = JDBCUtils.getConnection();
        //执行对象
        PreparedStatement statement = null;
        try {
            statement = connection.prepareStatement(sql);
            //解决参数
            statement.setString(1, dept.getDeptName());
            statement.setInt(2, dept.getDeptId());
            //执行
            i = statement.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            JDBCUtils.close(connection, statement);
        }
        return i;
    }

    /**
     * 根据编号查询部门信息
     * @param id
     * @return
     */
    public Dept getDeptById(int id) {
        //准备对象
        Dept dept = null;
        //准备sql
        String sql = "select * from tb_department where dept_id=?";
        //获取连接对象
        Connection connection = JDBCUtils.getConnection();
        //执行对象
        PreparedStatement statement = null;
        //结果集
        ResultSet resultSet = null;
        //先判断
        if (JDBCUtils.isConnection(connection)) {
            try {
                statement = connection.prepareStatement(sql);
                //解决参数
                statement.setInt(1, id);
                //执行
                resultSet = statement.executeQuery();
                if (resultSet.next()) {
                    dept = new Dept();
                    dept.setDeptId(resultSet.getInt("dept_id"));
                    dept.setDeptName(resultSet.getString("dept_name"));
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }finally {
                JDBCUtils.close(connection,statement,resultSet);
            }
        }
        return dept;
    }

    /**
     * 查询全部部门信息
     * @return
     */
    public List<Dept> findAllDept(){
        //准备集合
        List<Dept> deptList = new ArrayList<>(10);
        //准备sql
        String sql="select * from tb_department order by dept_id";
        //获取连接对象
        Connection connection = JDBCUtils.getConnection();
        //执行对象
        PreparedStatement statement = null;
        ResultSet resultSet = null;
        if(JDBCUtils.isConnection(connection)){
            try {
                statement=connection.prepareStatement(sql);
                //执行
                resultSet=statement.executeQuery();
                //循环判断
                while (resultSet.next()){
                    //创建一个部门对象
                    Dept dept = new Dept();
                    //取值存入到属性中
                    dept.setDeptId(resultSet.getInt("dept_id"));
                    dept.setDeptName(resultSet.getString("dept_name"));
                    //将对象存入到集合中
                    deptList.add(dept);
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }finally {
                JDBCUtils.close(connection,statement,resultSet);
            }
        }
        return deptList;
    }

}

DeptService

package com.javasm.service;

import com.javasm.bean.Dept;
import com.javasm.dao.DeptDao;

import javax.sound.midi.Soundbank;
import java.util.List;
import java.util.Scanner;

/**
 * @Author：Zxb
 * @Version：1.0
 * @Date：2022/12/12-15:29
 * @Since：jdk1.8
 * @Description：
 */
public class DeptService {

    private Scanner scanner = new Scanner(System.in);

    private DeptDao deptDao = new DeptDao();

    /**
     * 添加
     */
    public void add(){
        System.out.println("部门管理>>>添加部门");
        Dept dept = new Dept();
        System.out.println("请输入部门的编号");
        dept.setDeptId(scanner.nextInt());
        System.out.println("请输入部门的名称");
        dept.setDeptName(scanner.next());
        int i = deptDao.addDept(dept);
        if(i>0){
            System.out.println("添加成功");
        }else{
            System.out.println("添加失败");
        }
    }

    /**
     * 删除
     */
    public void delete(){
        System.out.println("部门管理>>>删除部门");
        System.out.println("请输入要删除的部门编号：");
        int inputId = scanner.nextInt();
        int i=deptDao.deleteDeptById(inputId);
        if(i>0){
            System.out.println("删除成功");
        }else{
            System.out.println("删除失败");
        }
    }

    /**
     * 修改
     */
    public void update(){
        System.out.println("部门管理>>>修改部门");
        System.out.println("请输入修改部门的编号");
        int id = scanner.nextInt();
        //根据编号查找部门信息
        Dept dept = deptDao.getDeptById(id);
        if (dept == null) {
            System.out.println("[修改失败，该部门不存在！]");
            return;
        }
        System.out.println("原部门名称：<" + dept.getDeptName() + ">请输入修改之后的部门名称：");
        dept.setDeptName(scanner.next());
        int i = deptDao.updateDept(dept);
        if(i>0){
            System.out.println("修改成功");
        }else{
            System.out.println("修改失败");
        }
    }

    /**
     * 查询
     */
    public void find(){
        System.out.println("部门管理>>>查看部门");
        List<Dept> deptList = deptDao.findAllDept();
        if(deptList.isEmpty()){
            System.out.println("还没有任何部门信息");
            return;
        }
        for (Dept dept : deptList) {
            System.out.println(dept);
        }
    }

}