SpringBoot 整合mybatis+mybatis-plus的详细步骤
目录
- 前言
- 准备工作
- 整合步骤
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
整合步骤
工程的完整包结构如图所示
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
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
本篇到这里基本上就结束了,更多的业务大家可以结合自身的实际情况,继续在代码中补充即可
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