全网最详细的SpringBoot学习-day08-阿里云开发者社区

全网最详细的SpringBoot学习-day08

2022-01-17 106

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简介： 全网最详细的SpringBoot学习-day08

SpringBoot整合MyBatis

官方文档：http://mybatis.org/spring-boot-starter/mybatis-spring-boot-autoconfigure/

Maven仓库地址：Maven Repository: org.mybatis.spring.boot » mybatis-spring-boot-starter » 2.1.4 (mvnrepository.com)

Mybatis开发文档地址：mybatis – MyBatis 3 | 简介

整合测试

导入 MyBatis 所需要的依赖

<!-- https://mvnrepository.com/artifact/org.mybatis.spring.boot/mybatis-spring-boot-starter -->
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.1.4</version>
</dependency>

配置数据库连接信息

spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.url=jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC&useSSL=false&useUnicode=true&characterEncoding=utf8
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
#mybatis
mybatis.type-aliases-package=com.sxau.pojo
mybatis.mapper-locations=classpath:mybatis/mapper/*.xml

测试数据库是否连接成功！
创建实体类，导入 Lombok！
User.java

package com.sxau.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private int id;
    private String name;
    private String pwd;
}

创建mapper目录以及对应的 Mapper 接口
UserMapper.java

package com.sxau.mapper;
import com.sxau.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;
import java.util.List;
@Mapper //注解表示是一个mybatis的mapper类
@Repository
public interface UserMapper {
    List<User> queryUserList();
    User quertUserById(int id);
    int addUser(User user);
    int updateUser(User user);
    int deleteUser(int id);
}

对应的Mapper映射文件
UserMapper.xml

<?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.sxau.mapper.UserMapper">
    <select id="queryUserList" resultType="User">
        select * from mybatis.user
    </select>
    <select id="quertUserById" parameterType="int" resultType="User">
        select * from mybatis.user where id=#{id}
    </select>
    <insert id="addUser" parameterType="User">
        insert into mybatis.user (id,name,pwd) values (#{id},#{name},#{pwd})
    </insert>
    <update id="updateUser" parameterType="User">
        update mybatis.user set name=#{name},pwd=#{pwd} where id=#{id}
    </update>
    <delete id="deleteUser" parameterType="int">
        delete from mybatis.user where id=#{id}
    </delete>
</mapper>

maven配置资源过滤问题

<resources>
    <resource>
        <directory>src/main/java</directory>
        <includes>
            <include>**/*.xml</include>
        </includes>
        <filtering>true</filtering>
    </resource>
</resources>

编写部门的 UserController 进行测试！

package com.sxau.controller;
import com.sxau.mapper.UserMapper;
import com.sxau.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@RestController
public class UserController {
    @Autowired
    private UserMapper userMapper;
    @GetMapping("/queryUserList")
    public List<User> queryUserList(){
        List<User> users = userMapper.queryUserList();
        return users;
    }
    @GetMapping("/quertUserById")
    public User quertUserById(@PathVariable("id")int id){
        User user = userMapper.quertUserById(1);
        return user;
    }
    @GetMapping("/addUser")
    public String addUser(){
        userMapper.addUser(new User(10,"阿峰","1234"));
        return "addUser,ok";
    }
    @GetMapping("/updateUser")
    public String updateUser(){
        userMapper.updateUser(new User(10,"阿哥哥","1111111"));
        return "updateUser,ok";
    }
    @GetMapping("/deleteUser")
    public String deleteUser(@PathVariable("id")int id){
        userMapper.deleteUser(10);
        return "deleteUser,ok";
    }
}