Mybatis实现品牌数据的增删改查

企业开发 2023-07-01 09:42:57 阅读次数: 0

项目目录如下图所示。Mapper包用于存储对数据库进行操作的Mapper接口文件，本文中通过注释的方式对sql语句进行编写。pojo包中存放实体类文件，文件中包含Brand对象相关字段的定义以及get、set、toString方法。service包中存放service层文件，调用mapper文件对数据库进行增删改查等操作。web包中存放servlet.java文件，接收来自前端界面的数据，将数据封装，传入service层中。util包中存放工具类，此处的SqlSessionFactoryUtils文件抽取了SqlSessionFactory方法，避免了其重复定义。
在这里插入图片描述
数据库信息
在这里插入图片描述
在这里插入图片描述

Brand Mapper.java
用于定义操纵数据库的接口函数，可以通过两种方式对接口函数进行实现（注解以及xml文件的方式），简单的sql语句可通过注解的方式进行实现，较为复杂的函数需通过xml进行实现。

package com.wu.mapper;
import com.wu.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<Brand> selectAll();

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

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

    /**
     * 更新品牌信息
     *
     * @param brand
     */
    @Update("update tb_brand set brand_name = #{brandName}, company_name = #{companyName}, " +
            "ordered = #{ordered}, description =#{description}, status = #{status} " +
            "where id = #{id}")
    void updateBrand(Brand brand);

    /**
     * 删除品牌
     *
     * @param id
     */
    @Delete("delete from tb_brand where id = #{id}")
    void deleteById(int id);
}

Brand.java
Brand实体类文件，定义了Brand对象的相关字段及方法。

package com.wu.pojo;

public class Brand  {
    
    
    private Integer id;
    private String brandName;
    private String companyName;
    private Integer ordered;
    private String description;
    private Integer status;

    public Integer getId() {
    
    
        return id;
    }

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

    public String getBrandName() {
    
    
        return brandName;
    }

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

    public String getCompanyName() {
    
    
        return companyName;
    }

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

    public Integer getOrdered() {
    
    
        return ordered;
    }

    public void setOrdered(int 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(int status) {
    
    
        this.status = status;
    }

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

BrandService.java
Service层文件，通过定义sqlSessionFactory来调用brandMapper中的方法，从而实现对数据库的相关操作。

package com.wu.service;
import com.wu.mapper.BrandMapper;
import com.wu.pojo.Brand;
import com.wu.util.SqlSessionFactoryUtils;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import java.util.List;

public class BrandService {
    
    

    SqlSessionFactory sqlSessionFactory = SqlSessionFactoryUtils.getSqlSessionFactory();

    /**
     * 查询所有成员
     * @return
     */
    public List<Brand> selectAll() {
    
    
        SqlSession sqlSession = sqlSessionFactory.openSession(true);//true事务的自动提交
        BrandMapper brandMapper = sqlSession.getMapper(BrandMapper.class);
        List<Brand> brands = brandMapper.selectAll();
        sqlSession.close();
        return brands;
    }

    /**
     * 添加成员
     */
    public void addBrand(Brand brand){
    
    
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        BrandMapper brandMapper = sqlSession.getMapper(BrandMapper.class);
        brandMapper.addBrand(brand);
        sqlSession.close();
    }

    /**
     * 根据id查询
     * @return
     */
    public Brand selectById(int id) {
    
    
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        BrandMapper brandMapper = sqlSession.getMapper(BrandMapper.class);
        Brand brand = brandMapper.selectById(id);
        sqlSession.close();
        return brand;
    }

    /**
     * 修改品牌信息
     * @param brand
     */
    public void update(Brand brand){
    
    
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        BrandMapper brandMapper = sqlSession.getMapper(BrandMapper.class);
        brandMapper.updateBrand(brand);
        sqlSession.close();
    }

    /**
     * 删除品牌
     * @param id
     */
    public void deleteById(int id){
    
    
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        BrandMapper brandMapper = sqlSession.getMapper(BrandMapper.class);
        brandMapper.deleteById(id);
        sqlSession.close();
    }
}

SqlSessionFactoryUtils.java

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

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

AddServlet.java
接收前端界面传递的参数，将其封装为Brand对象，通过调用service层的方法实现添加操作。

package com.wu.web;
import com.wu.pojo.Brand;
import com.wu.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( "/addServlet")
public class AddServlet extends HttpServlet {
    
    

    private BrandService brandService = 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");

        // 接收表单提交的数据
        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");

        // 封装为Brand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
        brandService.addBrand(brand);

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

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

DeleteByIdServlet.java
接收前端界面传递的id，调用service层的deleteById方法，将id传入，实现根据id删除的操作。

package com.wu.web;
import com.wu.service.BrandService;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;

@WebServlet("/deleteByIdServlet")
public class DeleteByIdServlet extends HttpServlet {
    
    

    private BrandService brandService = new BrandService();

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    
        String id = request.getParameter("id");
        brandService.deleteById(Integer.parseInt(id));
        request.getRequestDispatcher("/selectAllServlet").forward(request, response);
    }

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

SelectAllServlet.java
调用service层selectAll方法，查询所有数据，并将数据封装为Attribute进行转发。

package com.wu.web;
import com.wu.pojo.Brand;
import com.wu.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 {
    
    

    private BrandService brandService = new BrandService();

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    

        //1. 调用BrandService完成查询
        List<Brand> brands = brandService.selectAll();
        //2. 将brands存入request域中
        request.setAttribute("brands", brands);
        //3. 转发到brand.jsp页面
        request.getRequestDispatcher("/brand.jsp").forward(request, response);
    }

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

SelectByIdServlet.java
接收前端界面传递的id，调用service层selectById方法，实现根据id查询，并将查询结果封装为attribute，转发到update.jsp页面。

package com.wu.web;
import com.wu.pojo.Brand;
import com.wu.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 brandService = new BrandService();

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    
        // 接收id
        String id = request.getParameter("id");
        // 调用service查询
        Brand brand = brandService.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.java
接收前端界面传递来的参数，将其封装为brand对象，调用service层的update方法，实现更新操作。

package com.wu.web;
import com.wu.pojo.Brand;
import com.wu.service.BrandService;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;

@WebServlet("/updateServlet")
public class UpdateServlet extends HttpServlet {
    
    

    private BrandService brandService = new BrandService();

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    

        request.setCharacterEncoding("utf-8");//解决乱码问题

        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");

        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));

        brandService.update(brand);

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

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

BrandMapper.xml
resultMap用于解决数据库字段名和对象名称不同而导致的匹配失败问题

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "https://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!--
    namespace:名称空间
-->
<mapper namespace="com.wu.mapper.BrandMapper">
    <resultMap id="brandResultMap" type="brand">
        <result column="brand_name" property="brandName"></result>
        <result column="company_name" property="companyName"></result>
    </resultMap>
</mapper>

mybatis-config.xml
数据库连接等相关操作

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "https://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!--包扫描-->
    <typeAliases>
        <package name="com.wu.pojo"/>  <!--包扫描 给pojo下的实体类起了别名，默认为类名，不区分大小写-->
    </typeAliases>
    <!--
    environments:配置数据库连接环境信息，可以配置多个environment，通过default属性切换不同的environment
    -->
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <!--数据库连接信息-->
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql:///mybatis?useSSL=false&amp;userServerPrepStmts=true"/>
                <property name="username" value="root"/>
                <property name="password" value="123456"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <!--加载sql的映射文件-->
<!--        <mapper resource="com/wu/mapper/UserMapper.xml"/>-->
        
        <!--Mapper代理方式-->
        <package name="com.wu.mapper"/>
    </mappers>
</configuration>

addBrand.jsp
添加品牌界面

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
    <title>addBrand</title>
</head>
<body>
<h3>添加品牌</h3>
<form action="/jsp-demo/addServlet" method="post"><br>
    品牌名称：<input name="brandName"><br>
    企业名称：<input name="companyName"><br>
    排序：<input name="ordered"><br>
    描述信息：<textarea rows="5" cols="20" name="description"></textarea><br>
    状态：<input type="radio" name="status" value="0">禁用
    <input type="radio" name="status" value="1">启用<br>
    <input type="submit" value="提交">
    <input type="reset" value="重置">
</form>
</body>
</html>

在这里插入图片描述

brand.jsp
展示全部品牌界面

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>brand</title><br>
</head>
<body>
<input type="button" value="新增" id="add">
<table border="1" cellpadding="0" width="800">
    <tr>
        <th>序号</th>
        <th>品牌名称</th>
        <th>企业名称</th>
        <th>排序</th>
        <th>品牌介绍</th>
        <th>状态</th>
        <th>操作</th>
    </tr>
    <c:forEach items="${brands}" var="brand" varStatus="status">
        <tr align="center">
            <td>${
    
    status.count}</td>
            <td>${
    
    brand.brandName}</td>
            <td>${
    
    brand.companyName}</td>
            <td>${
    
    brand.ordered}</td>
            <td>${
    
    brand.description}</td>
            <c:if test="${brand.status == 1}">
                <td>启用</td>
            </c:if>
            <c:if test="${brand.status != 1}">
                <td>禁用</td>
            </c:if>
            <td><a href="/jsp-demo/selectByIdServlet?id=${brand.id}">修改</a>
                <a href="/jsp-demo/deleteByIdServlet?id=${brand.id}">删除</a></td>
        </tr>
    </c:forEach>
</table>

<script>
    document.getElementById('add').onclick = function (){
    
    
        location.href = "/jsp-demo/addBrand.jsp"
    }
</script>
</body>
</html>

在这里插入图片描述
index.html
初始界面，仅包含select all超链接

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <a href="/jsp-demo/selectAllServlet">select all</a>
</body>
</html>

update.jsp
更新界面，接收根据id查询到的参数，显示到界面上。对其进行修改，修改后的参数进行更新操作。

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>update</title>
</head>
<body>
<h3>添加品牌</h3>
<form action="/jsp-demo/updateServlet" method="post"><br>
    <%--隐藏域 提交id--%>
    <input type="hidden" name="id" value="${brand.id}">
    品牌名称：<input name="brandName" value="${brand.brandName}"><br>
    企业名称：<input name="companyName" value="${brand.companyName}"><br>
    排序：<input name="ordered" value="${brand.ordered}"><br>
    描述信息：<textarea rows="5" cols="20" name="description">${
    
    brand.description}</textarea><br>
    状态：
    <c:if test="${brand.status == 1}">
        <input type="radio" name="status" value="0">禁用
        <input type="radio" name="status" value="1" checked>启用<br>
    </c:if>
    <c:if test="${brand.status == 0}">
        <input type="radio" name="status" value="0" checked>禁用
        <input type="radio" name="status" value="1">启用<br>
    </c:if>

    <input type="submit" value="提交">
    <input type="reset" value="重置">
</form>
</body>
</html>

在这里插入图片描述

pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.wu</groupId>
  <artifactId>jsp-demo</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>jsp-demo Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.5</version>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.28</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    <dependency>
      <groupId>taglibs</groupId>
      <artifactId>standard</artifactId>
      <version>1.1.2</version>
    </dependency>
  </dependencies>

  <build>
      <plugins>
        <plugin>
          <groupId>org.apache.tomcat.maven</groupId>
          <artifactId>tomcat7-maven-plugin</artifactId>
          <version>2.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.1.0</version>
        </plugin>
        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.8.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.22.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-war-plugin</artifactId>
          <version>3.2.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
      </plugins>
  </build>
</project>

猜你喜欢

转载自blog.csdn.net/WuwuwuH_/article/details/131415526
今日推荐
《美国对全球网络空间安全与发展的威胁和破坏》报告发布
火速冲上 GitHub 热榜 —— 开源编程语言、框架哪有这么可爱？
北京人形机器人创新中心发布全球首个纯电驱拟人奔跑的全尺寸人形机器人“天工”
LFOSSA 源来如此公开课 | 掌握云原生未来：CNCF 认证全面攻略与备考秘籍
国产云输入法——仅华为无云端数据上传安全问题
开源日报 | 工业开源项目OGG 1.0；姐姐，你要和我一起配置火狐吗；苹果AI遥遥落后？Fedora 40
周排行
购置笔记本常识
从源码看Spring Security之采坑笔记（Spring Boot篇）
大数据学习——高可用配置案例
如何避免选择不专业的建站公司?
Euclid's Game HDU - 1525（博弈）
面试笔记（六）---Js实现eventHandler
Windows 实例搭建的 FTP 在外网无法连接和访问
设计模式 : 桥接模式
USB 设备驱动开发之几个重要结构体分析
14-p14_sqrt求平方根
每日归档
更多
2024-04-29(40)
2024-04-28(0)
2024-04-27(56)
2024-04-26(39)
2024-04-25(22)
2024-04-24(36)
2024-04-23(26)
2024-04-22(39)
2024-04-21(0)
2024-04-20(6)

代码天地 © 2018 codetd.com

境外服务器   最新电视剧2022