使用springboot+mybatis搭建连接mysql项目

一、通过maven引入相应的包 pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.2.1</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>doris</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>doris</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>3.0.3</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</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>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter-test</artifactId>
            <version>3.0.3</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

二、项目结构

三、配置 (application.properties)

spring.datasource.url=jdbc:mysql://yourip:9030/dxh_test
spring.datasource.username=admin
spring.datasource.password=wsf@123456
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

mybatis.type-aliases-package=com.example.doris.model
mybatis.mapper-locations=classpath:mybatis/*.xml
mybatis.configuration.map-underscore-to-camel-case=true

server.port=8081

四、实体（数据表对应的实体类:model/UserInfo.java）

@Data
public class UserInfo {

    private BigInteger id;
    private BigInteger userId;
    private String userName;
}

五、mapper类（UserInfoMapper.java)

@Mapper
public interface UserInfoMapper {

    @org.apache.ibatis.annotations.Select("select `id`,`user_id` AS userId,`user_name` AS userName from user_info_v6")
    public List<com.example.doris.model.UserInfo> selectAll();

    List<UserInfo> getUserInfoList();
}

六、项目入口(DorisApplication.java)添加MapperScan(mapper类对应的包)

@SpringBootApplication
@MapperScan("com.example.doris.dao")
public class DorisApplication {

    public static void main(String[] args) {
        SpringApplication.run(DorisApplication.class, args);
    }

}

七、mybatis对应的表的XML配置（UserInfoMapper.xml）

<?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.example.doris.dao.UserInfoMapper">
    <select id="getUserInfoList" resultType="UserInfo">
        select * from user_info_v6
    </select>
</mapper>

八、服务层(service)

8.1 服务接口层(interface => UserInfoService)

public interface UserInfoService {

    List<UserInfo> getAllUserInfo() throws Exception;

    List<DorisTestModel> getAllDorisTestModel() throws Exception;

}

8.2 服务实现层(impl=> UserInfoImplService)

@Service
public class UserInfoImplService implements UserInfoService {
    @Autowired
    UserInfoMapper userInfoMapper;

    @Autowired
    DorisTestMapper dorisTestMapper;

    @Override
    public List<UserInfo> getAllUserInfo() throws Exception{
        //List<UserInfo> userInfoList = userInfoMapper.selectAll();
        List<UserInfo> userInfoList = userInfoMapper.getUserInfoList();
        System.out.println(userInfoList);
        return userInfoList;
    }

    @Override
    public List<DorisTestModel> getAllDorisTestModel() throws Exception {
        return dorisTestMapper.selectAll();
    }
}

九、控制层

@RestController
@RequestMapping("/userinfo")
public class UserInfoController {
    @Autowired
    UserInfoService userInfoService;

    @RequestMapping("/list")
    public List<UserInfo> getUserInfoList() {
        try {
            return userInfoService.getAllUserInfo();

        } catch (Exception ex) {
            System.out.println(ex.getMessage());
            return null;
        }
    }
}

十、数据库的创表：(本实例是使用的doris，doris支持mysql的协议)

### 创建表SQL
CREATE TABLE `user_info_v6` (
`id` int NULL COMMENT "id",
`user_id` int NULL COMMENT "user_id",
`user_name` varchar(40) NULL COMMENT "名称"
) ENGINE=OLAP
UNIQUE KEY(`id`)
COMMENT "OLAP"
DISTRIBUTED BY HASH(`id`) BUCKETS 1
PROPERTIES (
"replication_num" = "1",
 "in_memory" = "false",
"storage_format" = "V2"
);

###  插入数据SQL
insert into user_info_v6(`id`,`user_id`,`user_name`)
values (1,333,'doris-name-333'),
(2,444,'doris-name-444');


### 查询数据SQL
select  * from user_info_v6;

十一：结果

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