SpringBoot整合MyBatis实现增删改查案例完整版（附源代码）

1.简介

Spring Boot是一个简化Spring开发的框架。用来监护spring应用开发，约定大于配置，去繁就简，just run 就能创建一个独立的，产品级的应用。

我们在使用Spring Boot时只需要配置相应的Spring Boot就可以用所有的Spring组件，简单的说，spring boot就是整合了很多优秀的框架，不用我们自己手动的去写一堆xml配置然后进行配置。从本质上来说，Spring Boot就是Spring,它做了那些没有它你也会去做的Spring Bean配置。
闲话少说，上图文：

2.开始

• 新建一个项目
  
• 选择Spring Initializr项目
  
• 创建项目的文件结构以及jdk的版本，本次以demo为例
  
• 选择项目所需要的依赖
  
• 修改项目名，finish完成，本次选择为修改

来看一眼pom文件

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.1</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

• 修改配置文件本，文不使用application.properties文件 而使用更加简洁的application.yml文件。
  
  修改为application.yml
  内容：

server:
  port: 8080

spring:
  datasource:
    username: root
    password: root
    url: jdbc:mysql://localhost:3306/springboot?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC
    driver-class-name: com.mysql.cj.jdbc.Driver

mybatis:
  mapper-locations: classpath:mapping/*Mapper.xml
  type-aliases-package: com.example.entity.demo

logging:
  level:
    com:
      example:
        mapper : debug

创建表：

DROP TABLE IF EXISTS `user`;
CREATE TABLE `user`  (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
  `password` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
  `address` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 4 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic;

目录结构：

UserController.java

package com.example.demo.controller;

import com.example.demo.entity.User;
import com.example.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.web.bind.annotation.*;

/**
 * @author yn2333
 * @Date 2020/03/03
 */

@RestController
@RequestMapping("/test")
public class UserController {

    @Autowired
    private UserService userService;

    @RequestMapping(value = "/selectUserByid", produces = "application/json;charset=UTF-8", method = RequestMethod.GET)
    @ResponseBody
    public String GetUser(User user){
        return userService.Sel(user).toString();
    }

    @RequestMapping(value = "/add", produces = "application/json;charset=UTF-8", method = RequestMethod.GET)
    public String Add(User user){
           return userService.Add(user);
    }

    @RequestMapping(value = "/update", produces = "application/json;charset=UTF-8", method = RequestMethod.GET)
    public String Update(User user){
        return userService.Update(user);
    }

    @RequestMapping(value = "/delete", produces = "application/json;charset=UTF-8", method = RequestMethod.GET)
    public String Delete(User user){
        return userService.Delete(user);
    }
}

User.java

package com.example.demo.entity;

/**
 * @author yn2333
 * @Date 2020/03/03
 */
public class User {
    private Integer id;
    private String username;
    private String password;
    private String address;

    public User(Integer id, String username, String password, String address) {
        this.id = id;
        this.username = username;
        this.password = password;
        this.address = address;
    }

    public Integer getId() {
        return id;
    }

    public String getUsername() {
        return username;
    }

    public String getPassword() {
        return password;
    }

    public String getAddress() {
        return address;
    }

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

    public void setUsername(String username) {
        this.username = username;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", address='" + address + '\'' +
                '}';
    }
}

UserMapper.java

package com.example.demo.mapper;

import com.example.demo.entity.User;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Repository;

/**
 * @author yn2333
 * @Date 2020/03/03
 */
@Repository
public interface UserMapper {

    User Sel(@Param("user")User user);

    int Add(@Param("user")User user);

    int Update(@Param("user")User user);

    int Delete(@Param("user")User user);
}

UserService.java

package com.example.demo.service;

import com.example.demo.entity.User;
import com.example.demo.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @author yn2333
 * @Date 2020/03/03
 */
@Service
public class UserService {
    @Autowired
    UserMapper userMapper;

    public User Sel(User user) {
        return userMapper.Sel(user);
    }

    public String Add(User user) {
        int a = userMapper.Add(user);
        if (a == 1) {
            return "添加成功";
        } else {
            return "添加失败";
        }
    }

    public String Update(User user) {
        int a = userMapper.Update(user);
        if (a == 1) {
            return "修改成功";
        } else {
            return "修改失败";
        }
    }

    public String Delete(User user) {
        int a = userMapper.Delete(user);
        if (a == 1) {
            return "删除成功";
        } else {
            return "删除失败";
        }
    }

}

DemoApplication.java

package com.example.demo;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
 * @author yn2333
 * @Date 2020/03/03
 */

@MapperScan("com.example.demo.mapper") //扫描的mapper
@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

}

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.example.demo.mapper.UserMapper">

    <resultMap id="BaseResultMap" type="com.example.demo.entity.User">
        <result column="id" jdbcType="INTEGER" property="id"/>
        <result column="userName" jdbcType="VARCHAR" property="username"/>
        <result column="passWord" jdbcType="VARCHAR" property="password"/>
        <result column="realName" jdbcType="VARCHAR" property="address"/>
    </resultMap>

    <select id="Sel" resultType="com.example.demo.entity.User">
        select * from user where 1=1
        <if test="user.id != null">
            AND id = #{user.id}
        </if>
    </select>

    <insert id="Add" parameterType="com.example.demo.entity.User">
        INSERT INTO user
        <trim prefix="(" suffix=")" suffixOverrides=",">
            <if test="user.username != null">
                username,
            </if>
            <if test="user.password != null">
                password,
            </if>
            <if test="user.address != null">
                address,
            </if>
        </trim>
        <trim prefix="VALUES (" suffix=")" suffixOverrides=",">
            <if test="user.username != null">
                #{user.username,jdbcType=VARCHAR},
            </if>
            <if test="user.password != null">
                #{user.password,jdbcType=VARCHAR},
            </if>
            <if test="user.address != null">
                #{user.address,jdbcType=VARCHAR},
            </if>
        </trim>
    </insert>

    <update id="Update" parameterType="com.example.demo.entity.User">
        UPDATE user
        <set>
            <if test="user.username != null">
                username = #{user.username},
            </if>
            <if test="user.password != null">
                password = #{user.password},
            </if>
            <if test="user.address != null">
                address = #{user.address},
            </if>
        </set>
        WHERE
        id=#{user.id}
    </update>

    <delete id="Delete"  parameterType="com.example.demo.entity.User">
        DELETE FROM user WHERE id = #{user.id}
    </delete>

</mapper>

3.测试

• 启动
  
• 添加：
  127.0.0.1:8080/test/add?username=无极&password=123456&address=上海市
  
• 查询：
  127.0.0.1:8080/test/selectUserByid?id=1
  
• 修改
  127.0.0.1:8080/test/update?id=1&username=码云&password=654321&address=北京
  
• 删除
  127.0.0.1:8080/test/delete?id=1
  
  增、删、改、查基本测试已经通过，Navicat刷新 之后就能看到效果。
  源代码以及sql文件已打包
  下载方式一：https://download.csdn.net/download/weixin_44395707/12223942
  下载方式二：
  扫下方二维码关注公众号回复：code001即可获取