SpringBoot怎么整合mybatis+mybatis-plus

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准备工作

准备如下一个数据表

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;

插入几条测试数据

整合步骤

工程的完整包结构如图所示

导入Maven依赖

    <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依赖-->        <dependency>            <groupId>mysql</groupId>            <artifactId>mysql-connector-java</artifactId>            <version>${mysql-connector-java.version}</version>        </dependency>         <!--阿里巴巴fastjosn依赖-->        <dependency>            <groupId>com.alibaba</groupId>            <artifactId>fastjson</artifactId>            <version>${fastjson.version}</version>        </dependency>         <!--阿里巴巴数据库连接池依赖-->        <!-- Druid -->        <dependency>            <groupId>com.alibaba</groupId>            <artifactId>druid-spring-boot-starter</artifactId>            <version>${druid.version}</version>        </dependency>         <dependency>            <groupId>org.mybatis.spring.boot</groupId>            <artifactId>mybatis-spring-boot-starter</artifactId>            <version>2.1.1</version>        </dependency>         <!-- MyBatis增强工具-->        <dependency>            <groupId>com.baomidou</groupId>            <artifactId>mybatis-plus-boot-starter</artifactId>            <version>${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>

配置文件 application.yml

server:  port: 8083logging:  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  #设置单个文件最大上传大小  servlet:    multipart:      max-file-size: 20MBmybatis-plus:  mapper-locations: classpath*:mapper@Configuration@EnableSwagger2public 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("后端相关API")                .version("1.0")                .build();    } }

实体类

import com.baomidou.mybatisplus.annotation.TableField;import lombok.Data; @Datapublic 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; }

dao接口，里面添加一个查询所有数据的方法

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

mybatis层，写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>

业务实现类

在本次的业务实现中，同时可以使用mybatis的方式以及mybatis-plus的方式进行，具体使用的时候结合自身的需求进行选择；

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; @Servicepublic 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);    }}

添加一个测试接口

@RestControllerpublic 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);    }}

启动类

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

接下来，将工程运行起来做一下测试吧

启动之后，打开swagger界面

不妨随机测试两个接口吧，测试下获取所有学生的数据接口

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