SpringBoot整合MyBatis完成对用户增删改查

最新推荐文章于 2024-05-30 10:07:45 发布

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最新推荐文章于 2024-05-30 10:07:45 发布

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分类专栏： SpringBoot

本文链接：https://blog.youkuaiyun.com/qq_42922647/article/details/96881405

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本文详细介绍了一个基于Spring Boot和MyBatis的增删改查应用实例，从pom文件配置、全局配置文件设置、数据库表设计到实体类、Mapper接口及实现，再到Service层和服务实现类编写，最后到Controller层和Thymeleaf页面展示，提供了完整的开发流程和技术要点。

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1.pom文件的配置

<?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.panyuro</groupId>
  <artifactId>springboot</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

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

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.10.RELEASE</version>
  </parent>
  <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>
    <thymeleaf.version>3.0.2.RELEASE</thymeleaf.version>
    <thymeleaf-layout-dialect.version>2.0.4</thymeleaf-layout-dialect.version>
  </properties>

  <dependencies>
   <!-- thymeleaf启动器 -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!-- web启动器 -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
    <!-- Mybatis启动器 -->
    <dependency>
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
      <version>1.1.1</version>
    </dependency>
    <!-- mysql数据库驱动 -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <!-- druid数据库连接池 -->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.0.9</version>
    </dependency>
    <!--devtools配置，开启热部署-->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-devtools</artifactId>
      <optional>true</optional>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <finalName>springboot</finalName>    
<!--xml的路径配置-->
    <resources>
      <resource>
        <directory>src/main/java</directory>
        <includes>
          <include>**/*.xml</include>
        </includes>
      </resource>
    </resources>
  </build>
</project>

注：这里要配置xml的路径，因为Idea默认只会查找src/main/resources路径下的xml文件！！！！！

2. 添加 application.properties 全局配置文件（这里主要是数据库、DataSource、包别名的配置）

spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/spring
spring.datasource.username=root
spring.datasource.password=mysql
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
mybatis.type-aliases-package=com.my.pojo

3 数据库表设计

4.创建实体类（还要加上构造器和set、get方法）

public class User {
    private int id;
    private String name;
    private String password;

5.创建 mapper 接口以及映射配置文件

public interface UserMapper {
    public void insertUser(User user);
    public List<User> findAllUser();
    public User getUserById(Integer id);
    public void updateUser(User user);
    public void deleteUser(Integer id);
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.my.mapper.UserMapper">
    <insert id="insertUser" parameterType="user">
       insert into user(name,password) values(#{name},#{password})
	</insert>
    <select id="findAllUser" resultType="user" >
        select id,name,password from user
    </select>
   <select id="getUserById" resultType="user">
       select id,name,password from user where id=#{value}
   </select>
    <update id="updateUser" parameterType="user">
        update user set name=#{name},password=#{password} where id=#{id}
    </update>
    <delete id="deleteUser" parameterType="Integer">
        delete from user where id=#{value}
    </delete>
</mapper>

6.创建业务层 service的接口及实现类

public interface UserService {
    void addUser(User user);
    public List<User> findAllUser();
    public User getUserById(Integer id);
    public void updateUser(User user);
    public void deleteUser(Integer id);
}

@Service
@Transactional
public class UserServiceImp implements  UserService {
    @Autowired
    private UserMapper userMapper;

    @Override
    public void addUser(User user) {
       this.userMapper.insertUser(user);
    }
    @Override
    public List<User> findAllUser() {
        return this.userMapper.findAllUser();
    }
    @Override
    public User getUserById(Integer id) {
        return this.userMapper.getUserById(id);
    }
    @Override
    public void updateUser(User user) {
        this.userMapper.updateUser(user);
    }
    @Override
    public void deleteUser(Integer id) {
        this.userMapper.deleteUser(id);
    }
}

7.创建 Controller

@Controller
@RequestMapping("/user")
public class UserController {
    @Autowired
    public UserService userService;

    //增加用户
    @RequestMapping("/{page}")
    public String showPage(@PathVariable String page){
        return page;
    }
    @RequestMapping("/addUser")
    public String addUser(User user){
        this.userService.addUser(user);
        return "ok";
    }
  //查找所有用户信息
    @RequestMapping("/findAllUser")
    public String findAllUser(Model model){
        List<User> list=this.userService.findAllUser();
        model.addAttribute("list",list);
        return "showUsers";
    }

 //根据id查询该用户信息，用来做回显
    @RequestMapping("/findUserById")
    public String findUserById(Model model,Integer id){
        User user=this.userService.getUserById(id);
        model.addAttribute("user",user);
        return "editUser";
    }
//更新用户信息
    @RequestMapping("/update")
    public String updateUser(User user){
        this.userService.updateUser(user);
        return "ok";
    }
//根据id删除该用户信息，并重定向到查询页面
    @RequestMapping("/delete")
    public String deleteUser(Integer id){
        this.userService.deleteUser(id);
        return "redirect:/user/findAllUser";
    }
}

8.编写页面

用到了Thymeleaf语法，防止不识别th标签，加上命名空间

<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">

Thymeleaf语法参考：https://blog.youkuaiyun.com/qq_42922647/article/details/96784957

input.html

<body>
    <form th:action="@{/user/addUser}" method="post">
  用户名：<input type="text" name="name"/><br/>
  密码:   <input type="text" name="password"/>
        <input type="submit" value="提交"/>
    </form>
</body>

ok.html

<body>
     操作成功！!
</body>

showUsers.html

<body>
     <table border="1">
         <tr>
             <th>用户ID</th>
             <th>用户名</th>
             <th>用户密码</th>
             <th>更新操作</th>
             <th>删除操作</th>
         </tr>
         <tr th:each="user:${list}">
             <td th:text="${user.id}"></td>
             <td th:text="${user.name}"></td>
             <td th:text="${user.password}"></td>
             <td><a th:href="@{/user/findUserById(id=${user.id})}">更新</a></td>
             <td><a th:href="@{/user/delete(id=${user.id})}">删除</a></td>
         </tr>
     </table>
</body>

editUser.html

<body>
    <form th:action="@{/user/update}" method="post">
        <input type="hidden" name="id" th:field="${user.id}"/>
  用户名：<input type="text" name="name" th:field="${user.name}" /><br/>
  密码: <input text="text" name="password" th:field="${user.password}"/><br/>
        <input type="submit" value="更新"/>
    </form>
</body>

9.创建启动类

@SpringBootApplication
@MapperScan("com.my.mapper")//用户扫描MyBatis的Mapper接口
public class App {
    public static void main(String[] args) {
        SpringApplication.run(App.class,args);
    }
}

运行结果：

附：项目结构：