SpringBoot?整合mybatis+mybatis-plus的詳細步驟

更新時間：2022年06月24日 09:50:45 作者：逆風(fēng)飛翔的小叔

這篇文章主要介紹了SpringBoot?整合mybatis+mybatis-plus的步驟,本文通過圖文并茂的形式給大家介紹的非常詳細，對大家的學(xué)習(xí)或工作具有一定的參考借鑒價值，需要的朋友可以參考下

前言

在真實的項目開發(fā)中，使用SpringBoot可以說非常普遍了，而在框架整合中，與數(shù)據(jù)庫的交互無外乎使用jpa,mybatis，mybatis-plus這幾種，雖然hibernate仍然有在使用，畢竟框架畢竟重，而且用起來相較于mybatis還是差了那么點意思；

接下來演示下使用 SpringBoot 同時與mybatis，mybatis-plus的整合步驟；

準備工作

1、準備如下一個數(shù)據(jù)表

CREATE TABLE `student` (
  `id` varchar(32) NOT NULL,
  `gender` varchar(32) DEFAULT NULL,
  `age` int(12) DEFAULT NULL,
  `nick_name` varchar(32) DEFAULT NULL,
  `name` varchar(32) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

2、插入幾條測試數(shù)據(jù)

整合步驟

工程的完整包結(jié)構(gòu)如圖所示

1、導(dǎo)入maven依賴

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <mysql-connector-java.version>8.0.11</mysql-connector-java.version>
        <commons-lang3.version>3.7</commons-lang3.version>
        <fastjson.version>1.2.47</fastjson.version>
        <mybatis-plus-boot-starter.version>3.3.0</mybatis-plus-boot-starter.version>
        <mybatis-plus-generator.version>3.3.0</mybatis-plus-generator.version>
        <druid.version>1.1.14</druid.version>
        <lombok.version>1.18.0</lombok.version>
        <dubbo-spring-boot-starter.version>2.0.0</dubbo-spring-boot-starter.version>
        <swagger.version>2.9.2</swagger.version>
        <swagger-bootstrap-ui.version>1.9.6</swagger-bootstrap-ui.version>
    </properties>
 
    <dependencies>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.4</version>
        </dependency>
 
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
 
        <!--mysql依賴-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql-connector-java.version}</version>
        </dependency>
 
        <!--阿里巴巴fastjosn依賴-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>${fastjson.version}</version>
        </dependency>
 
        <!--阿里巴巴數(shù)據(jù)庫連接池依賴-->
        <!-- Druid -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>${druid.version}</version>
        </dependency>
 
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.1</version>
        </dependency>
 
        <!-- MyBatis增強工具-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>${mybatis-plus-boot-starter.version}</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>${mybatis-plus-generator.version}</version>
        </dependency>
 
        <!-- lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>${lombok.version}</version>
        </dependency>
 
        <!--swagger-ui-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>${swagger.version}</version>
        </dependency>
 
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>${swagger.version}</version>
        </dependency>
 
        <dependency>
            <groupId>com.github.xiaoymin</groupId>
            <artifactId>swagger-bootstrap-ui</artifactId>
            <version>${swagger-bootstrap-ui.version}</version>
        </dependency>
 
    </dependencies>

2、配置文件 application.yml

server:
  port: 8083
logging:
  config: classpath:logback-spring.xml  #日志
spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://IP:3306/school?autoReconnect=true&useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&useSSL=false
    username: root
    password: root
    druid:
      max-active: 100
      initial-size: 10
      max-wait: 60000
      min-idle: 5
  #設(shè)置單個文件最大上傳大小
  servlet:
    multipart:
      max-file-size: 20MB
mybatis-plus:
  mapper-locations: classpath*:mapper/*.xml
  global-config:
    db-column-underline: true  #開啟駝峰轉(zhuǎn)換
    db-config:
      id-type: uuid
      field-strategy: not_null
    refresh: true
  configuration:
    map-underscore-to-camel-case: true
    #log-impl: org.apache.ibatis.logging.stdout.StdOutImpl #打印sql語句便于調(diào)試

3、為了方便后面調(diào)試接口，增加一個swagger的配置

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
 
/**
 * swagger文檔，項目啟動后，瀏覽器訪問:http://localhost:8083/swagger-ui.html
 */
@Configuration
@EnableSwagger2
public class ApiSwagger2 {
 
    @Bean
    public Docket createRestBmbsApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .groupName("users")
                .apiInfo(apiInfo())
                .select()
                .apis(RequestHandlerSelectors.basePackage("com.congge.controller"))
                .paths(PathSelectors.any())
                .build();
    }
 
    private ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                .title("后端相關(guān)API")
                .version("1.0")
                .build();
    }
 
}

4、實體類

import com.baomidou.mybatisplus.annotation.TableField;
import lombok.Data;
 
@Data
public class Student {
 
    @TableField("id")
    private String id;
 
    @TableField("name")
    private String name;
 
    @TableField("gender")
    private String gender;
 
    @TableField("age")
    private int age;
 
    @TableField("nick_name")
    private String nickName;
 
}

5、dao接口，里面添加一個查詢所有數(shù)據(jù)的方法

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.congge.entity.Student;
import org.apache.ibatis.annotations.Mapper;
 
import java.util.List;
 
@Mapper
public interface StudentMapper extends BaseMapper<Student> {
 
    List<Student> queryAll();
 
}

6、mybatis層，寫sql的文件

<?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.congge.dao.StudentMapper">
 
    <select id="queryAll" resultType="com.congge.entity.Student">
		select * from student
	</select>
 
</mapper>

7、業(yè)務(wù)實現(xiàn)類

在本次的業(yè)務(wù)實現(xiàn)中，同時可以使用mybatis的方式以及mybatis-plus的方式進行，具體使用的時候結(jié)合自身的需求進行選擇；

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.congge.dao.StudentMapper;
import com.congge.entity.Student;
import com.congge.service.StudentService;
import org.springframework.stereotype.Service;
 
import javax.annotation.Resource;
import java.util.List;
 
@Service
public class StudentServiceImpl implements StudentService {
 
    @Resource
    private StudentMapper studentMapper;
 
    @Override
    public List<Student> queryAllStudent() {
        QueryWrapper<Student> queryWrapper = new QueryWrapper();
        List<Student> students = studentMapper.selectList(queryWrapper);
        return students;
        //return studentMapper.queryAll();
    }
 
    @Override
    public List<Student> getByName(String name) {
        QueryWrapper<Student> queryWrapper = new QueryWrapper();
        queryWrapper.like("name",name);
        return studentMapper.selectList(queryWrapper);
    }
 
    public Student getById(String id) {
        QueryWrapper<Student> queryWrapper = new QueryWrapper();
        queryWrapper.like("id",id);
        return studentMapper.selectOne(queryWrapper);
    }
}

8、添加一個測試接口

@RestController
public class StudentController {
 
    @Autowired
    private StudentService studentService;
 
    @GetMapping("/getAll")
    public List<Student> getAll(){
        return studentService.queryAllStudent();
    }
 
    @GetMapping("/getByName")
    public List<Student> getByName(@RequestParam String name){
        return studentService.getByName(name);
    }
 
    @GetMapping("/getById")
    public Student getById(@RequestParam String id){
        return studentService.getById(id);
    }
}

9、啟動類

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
 
@SpringBootApplication
public class App {
 
    public static void main(String[] args) {
        SpringApplication.run(App.class,args);
    }
 
}

接下來，將工程運行起來做一下測試吧

10、啟動之后，打開swagger界面