前言
在真实的项目开发中，使用SpringBoot可以说非常普遍了，而在框架整合中，与数据库的交互无外乎使用jpa,mybatis，mybatis-plus这几种，虽然hibernate仍然有在使用，毕竟框架毕竟重，而且用起来相较于mybatis还是差了那么点意思；
接下来演示下使用 SpringBoot 同时与mybatis，mybatis-plus的整合步骤；
准备工作
1、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; 2、插入几条测试数据
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整合步骤
工程的完整包结构如图所示
image.png
1、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> 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
#设置单个文件最大上传大小
servlet:
multipart:
max-file-size: 20MB
mybatis-plus:
mapper-locations: classpath*:mapper/*.xml
global-config:
db-column-underline: true #开启驼峰转换
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语句便于调试 3、为了方便后面调试接口，增加一个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文档，项目启动后，浏览器访问: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("后端相关API")
.version("1.0")
.build();
}
} 4、实体类
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;
@Mapper
public interface StudentMapper extends BaseMapper<Student> {
List<Student> queryAll();
} 6、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> 7、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;
@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、添加一个测试接口
@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、启动类
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);
}
} 接下来，将工程运行起来做一下测试吧
10、启动之后，打开swagger界面
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