SpringBoot配置mybatis-mysql数据源

前言

学习SpringBoot整合mybatis + mysql配置，首先需要了解什么是ORM(对象映射关系)框架，ORM（Object Relational Mapping）对象关系映射，是一种为了解决面向对象与关系型数据库不匹配而出现的技术，使开发者能够用面向对象的方式使用关系型数据库。

学习配置

建表

CREATE TABLE `sys_user` (`id` int NOT NULL AUTO_INCREMENT COMMENT '主键',`name` varchar(100) DEFAULT NULL COMMENT '用户名',`password` varchar(255) DEFAULT NULL COMMENT '密码',PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb3;

创建一个简单的用户信息表，来作为数据库操作基础。

pom配置

<dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jdbc</artifactId></dependency><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.2.0</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-devtools</artifactId><scope>runtime</scope><optional>true</optional></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><scope>runtime</scope></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency>
</dependencies>

CRUD

简单的编写一下java代码来完成数据库的操作方法

domain(java-数据库映射实体)

import lombok.Data;
import java.io.Serializable;/*** @author yanzy* @date 2021/6/15 21:52* @since v1.0*/
@Data
public class SysUser implements Serializable {private Long id;private String name;private String password;
}

mapper(数据库操作接口)

import com.zy.study.domain.SysUser;/*** @author Yanzy*/
public interface SysUserMapper {int deleteByPrimaryKey(Long id);int insert(SysUser record);int insertSelective(SysUser record);SysUser selectByPrimaryKey(Long id);int updateByPrimaryKeySelective(SysUser record);int updateByPrimaryKey(SysUser record);
}

service (业务接口和业务接口实现)

import com.zy.study.domain.SysUser;/*** @author yanzy* @date 2021/6/15 21:53* @since v1.0*/
public interface SysUserService {int deleteByPrimaryKey(Long id);int insert(SysUser record);int insertSelective(SysUser record);SysUser selectByPrimaryKey(Long id);int updateByPrimaryKeySelective(SysUser record);int updateByPrimaryKey(SysUser record);
}

import com.zy.study.domain.SysUser;
import com.zy.study.mapper.SysUserMapper;
import com.zy.study.service.SysUserService;
import lombok.AllArgsConstructor;
import org.springframework.stereotype.Service;/*** @author yanzy* @date 2021/6/15 21:54* @since v1.0*/
@Service
@AllArgsConstructor
public class SysUserServiceImpl implements SysUserService {private final SysUserMapper sysUserMapper;@Overridepublic int deleteByPrimaryKey(Long id) {return sysUserMapper.deleteByPrimaryKey(id);}@Overridepublic int insert(SysUser record) {return sysUserMapper.insert(record);}@Overridepublic int insertSelective(SysUser record) {return sysUserMapper.insertSelective(record);}@Overridepublic SysUser selectByPrimaryKey(Long id) {return sysUserMapper.selectByPrimaryKey(id);}@Overridepublic int updateByPrimaryKeySelective(SysUser record) {return sysUserMapper.updateByPrimaryKeySelective(record);}@Overridepublic int updateByPrimaryKey(SysUser record) {return sysUserMapper.updateByPrimaryKey(record);}
}

springboot配置

yml配置文件

spring:# 数据源配置datasource:driver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://192.168.31.10:3308/test?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8username: rootpassword: root
# mybatis配置
mybatis:# mapper.xml映射路径mapper-locations: classpath:mapper/*.xml# 数据库表映射实体所在包路径type-aliases-package: com.zy.study.domain

启动类

// 启动类需增加扫描mapper接口的注解, 不然会报错
@MapperScan("com.zy.study.mapper")
@SpringBootApplication
public class StudyProject02Application {public static void main(String[] args) {SpringApplication.run(StudyProject02Application.class, args);}
}

测试

编写一个简单的测试类，这里使用springboot-test的方式测试，不需要web启动服务编写controller就可以完成测试。

@SpringBootTest
class StudyProject02ApplicationTests {// 注入实例@Autowiredprivate SysUserService sysUserService;@Testvoid contextLoads() {// 调用查询方法, 验证数据源是否配置成功.SysUser sysUser = sysUserService.selectByPrimaryKey(1L);System.out.println(sysUser.toString());}
}