黑马程序员javaweb增删改查笔记brand-demo0

浅浅记录一下ba  中间出现了不少bug 感谢其他小伙伴的解答

mapper:BrandMapper--->

package com.itheima.mapper;

import com.itheima.pojo.Brand;
import org.apache.ibatis.annotations.*;

import java.util.List;

public interface BrandMapper {


    /**
     * 查询所有
     * @return
     */
    @Select("select * from tb_brand")
    @ResultMap("brandResultMap")
    List selectAll();

    /**
     * 添加
     * @param brand
     */
    @Insert("insert into tb_brand values (null,#{brandName},#{companyName},#{ordered},#{description},#{status})")
    void add(Brand brand);

    /**
     * 修改（回显）   根据id 查询
     * @return
     */
    @ResultMap("brandResultMap")
    @Select("select * from tb_brand where id=#{id}")
    Brand selectByIdBrand(int id);

    /**
     * 修改
     * @param brand
     */
    @Update( "update tb_brand set brand_name=#{brandName},company_name=#{companyName},ordered=#{ordered},description=#{description},STATUS=#{status} where id = #{id}")
    void update(Brand brand);

    /**
     * 删除
     */
    @Delete("delete from tb_brand where id=#{id}")
    void deleteById(Brand brand);


}

pojo:Brand--->

package com.itheima.pojo;

/**
 * 品牌实体类
 */

public class Brand {
    // id 主键
    private Integer id;
    // 品牌名称
    private String brandName;
    // 企业名称
    private String companyName;
    // 排序字段
    private Integer ordered;
    // 描述信息
    private String description;
    // 状态：0：禁用  1：启用
    private Integer status;


    public Brand() {
    }

    public Brand(Integer id, String brandName, String companyName, String description) {
        this.id = id;
        this.brandName = brandName;
        this.companyName = companyName;
        this.description = description;
    }

    public Brand(Integer id, String brandName, String companyName, Integer ordered, String description, Integer status) {
        this.id = id;
        this.brandName = brandName;
        this.companyName = companyName;
        this.ordered = ordered;
        this.description = description;
        this.status = status;
    }

    public Integer getId() {
        return id;
    }

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

    public String getBrandName() {
        return brandName;
    }

    public void setBrandName(String brandName) {
        this.brandName = brandName;
    }

    public String getCompanyName() {
        return companyName;
    }

    public void setCompanyName(String companyName) {
        this.companyName = companyName;
    }

    public Integer getOrdered() {
        return ordered;
    }

    public void setOrdered(Integer ordered) {
        this.ordered = ordered;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public Integer getStatus() {
        return status;
    }

    public void setStatus(Integer status) {
        this.status = status;
    }

    @Override
    public String toString() {
        return "Brand{" +
                "id=" + id +
                ", brandName='" + brandName + '\'' +
                ", companyName='" + companyName + '\'' +
                ", ordered=" + ordered +
                ", description='" + description + '\'' +
                ", status=" + status +
                '}';
    }
}

service:BrandService--->

package com.itheima.service;

import com.itheima.mapper.BrandMapper;
import com.itheima.pojo.Brand;
import com.itheima.util.SqlSessionFactoryUtils;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;

import java.util.List;

public class BrandService {

    SqlSessionFactory factory = SqlSessionFactoryUtils.getSqlSessionFactory();

    /**
     * 查询
     * @return
     */
    public List selectAll(){
        //1.调用BrandMapper
        SqlSession sqlSession = factory.openSession();
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        List brands = mapper.selectAll();
        sqlSession.close();
        return  brands;
    }

    /**
     * 添加
     */
    public void add(Brand brand){
        SqlSession sqlSession = factory.openSession();
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        mapper.add(brand);
        sqlSession.commit();
        sqlSession.close();
    }

    /**
     * 根据id 查询
     * @param id
     * @return
     */
    public Brand selectById(int id){
        SqlSession sqlSession = factory.openSession();
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        Brand brand = mapper.selectByIdBrand(id);
        sqlSession.close();
        return brand;
    }

    /**
     * 修改
     */
    public void update(Brand brand){
        SqlSession sqlSession = factory.openSession();
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        mapper.update(brand);
        sqlSession.commit();
        sqlSession.close();
    }

    /**
     * 删除
     * @param
     * @return
     */
    public void deleteById(Brand brand){
        SqlSession sqlSession = factory.openSession();
        BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
        mapper.deleteById(brand);
        sqlSession.commit();
        sqlSession.close();
    }

}

util:SqlSessionFactoryUtils--->

package com.itheima.util;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

public class SqlSessionFactoryUtils {

    private static SqlSessionFactory sqlSessionFactory;

    static {
        //静态代码块会随着类的加载而自动执行，且只执行一次

        try {
            String resource = "mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    public static SqlSessionFactory getSqlSessionFactory(){
        return sqlSessionFactory;
    }
}

web:AddServlet--->

package com.itheima.web;

import com.itheima.pojo.Brand;
import com.itheima.service.BrandService;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;

@WebServlet("/AddServlet")
public class AddServlet extends HttpServlet {
    private BrandService service = new BrandService();
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //处理Post请求的乱码问题
        request.setCharacterEncoding("utf-8");
        //接受表单提交的数据，封装为一个Brand对象
        String brandName = request.getParameter("brandName");
        String companyName = request.getParameter("companyName");
        String ordered = request.getParameter("ordered");
        String description = request.getParameter("description");
        String status = request.getParameter("status");

        //封装对象
        Brand brand = new Brand();
        brand.setBrandName(brandName);
        brand.setCompanyName(companyName);
        brand.setOrdered(Integer.parseInt(ordered));
        brand.setDescription(description);
        brand.setStatus(Integer.parseInt(status));

        //调用service 完成添加
        service.add(brand);

        //转发到查询所有Servlet
        request.getRequestDispatcher("selectAllServlet").forward(request,response);
         }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doGet(request, response);
    }
}

deleteServlet-->

package com.itheima.web;

import com.itheima.pojo.Brand;
import com.itheima.service.BrandService;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;

@WebServlet("/AddServlet")
public class AddServlet extends HttpServlet {
    private BrandService service = new BrandService();
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //处理Post请求的乱码问题
        request.setCharacterEncoding("utf-8");
        //接受表单提交的数据，封装为一个Brand对象
        String brandName = request.getParameter("brandName");
        String companyName = request.getParameter("companyName");
        String ordered = request.getParameter("ordered");
        String description = request.getParameter("description");
        String status = request.getParameter("status");

        //封装对象
        Brand brand = new Brand();
        brand.setBrandName(brandName);
        brand.setCompanyName(companyName);
        brand.setOrdered(Integer.parseInt(ordered));
        brand.setDescription(description);
        brand.setStatus(Integer.parseInt(status));

        //调用service 完成添加
        service.add(brand);

        //转发到查询所有Servlet
        request.getRequestDispatcher("selectAllServlet").forward(request,response);
         }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doGet(request, response);
    }
}

selectAllServlet-->

package com.itheima.web;

import com.itheima.pojo.Brand;
import com.itheima.service.BrandService;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
import java.util.List;

@WebServlet("/selectAllServlet")
public class selectAllServlet extends HttpServlet {
    BrandService brandService = new BrandService();
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        List brands = brandService.selectAll();

        request.setAttribute("brands",brands);

        request.getRequestDispatcher("/brand.jsp").forward(request,response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doGet(request, response);
    }
}

selectByIdServlet-->

package com.itheima.web;

import com.itheima.pojo.Brand;
import com.itheima.service.BrandService;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;

@WebServlet("/selectByIdServlet")
public class selectByIdServlet extends HttpServlet {
    private BrandService service = new BrandService();

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.接受id
        String id = request.getParameter("id");
        Brand brand = service.selectById(Integer.parseInt(id));
        request.setAttribute("brand",brand);
        request.getRequestDispatcher("/update.jsp").forward(request,response);

    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doGet(request, response);
    }
}

updateServlet-->

package com.itheima.web;

import com.itheima.pojo.Brand;
import com.itheima.service.BrandService;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/updateServlet")
public class updateServlet extends HttpServlet {
    private BrandService service = new BrandService();
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //处理Post请求的乱码问题
        request.setCharacterEncoding("utf-8");
        //接受表单提交的数据，封装为一个Brand对象
        String id = request.getParameter("id");
        String brandName = request.getParameter("brandName");
        String companyName = request.getParameter("companyName");
        String ordered = request.getParameter("ordered");
        String description = request.getParameter("description");
        String status = request.getParameter("status");

        //封装对象
        Brand brand = new Brand();
        brand.setId(Integer.parseInt(id));
        brand.setBrandName(brandName);
        brand.setCompanyName(companyName);
        brand.setOrdered(Integer.parseInt(ordered));
        brand.setDescription(description);
        brand.setStatus(Integer.parseInt(status));

        //调用service 完成修改
        service.update(brand);

        //转发到查询所有Servlet
        request.getRequestDispatcher("selectAllServlet").forward(request,response);
         }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doGet(request, response);
    }
}

resources:BrandMapper.xml--->

mybatis-config.xml-->

webapp:addBrand.jsp-->

<%--
  Created by IntelliJ IDEA.
  User: 革新银河
  Date: 2022/9/27
  Time: 21:18
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page isELIgnored="false" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>




    
    


添加品牌

    品牌名称：

    企业名称：

    排序：

    描述信息：

    状态：
    禁用
    启用


    

brand.jsp--->

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page isELIgnored="false" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>



    
    






    
<%--        --%>
    
            
            

    

        
序号
        
品牌名称
        
企业名称
        
排序
        
品牌介绍
        
状态
        
操作

    


${brand.id}
${status.count}
    
${brand.brandName}
        
${brand.companyName}
        
${brand.ordered}
        
${brand.description}
        
启用
        
        
禁用
        
        
修改 删除

    





<%--给add绑定单击事件--%>

index.html--->

    
    



查询所有

update.jsp-->

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page isELIgnored="false" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>




    
    


修改品牌


<%--   隐藏域，提交id--%>
            
    品牌名称：

    企业名称：

    排序：

    描述信息：${brand.description}

    状态：
    
        禁用
        启用

    
    
        禁用
        启用

    


    

搞定！