SpringBoot持久层技术

一、Springboot整合mybatis

maven中添加对数据库与mybatis的依赖

<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>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
    </dependency>
</dependencies>

添加application.properties关于mybatis的配置

spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/dbName
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
mybatis.type-aliases-package=io.guangsoft.pojo

mapper的xml文件所在目录需要在springboot启动类中配置扫描

1 @SpringBootApplication
2 @MapperScan("io.guangsoft.mapper")

数据库表设计

create table users(
    id int(11) not null auto_increment,
    name varchar(25) default null,
    age int default null,
    primary key (id)
)engine=InnoDB default charset=utf8;

pojo

public class User {
    private Integer id;
    private String name;
    private Integer age;
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
}

mapper

public interface UserMapper {
    void insertUser(User user);
    List<User> selectUserAll();
}

<mapper namespace="io.guangsoft.mapper.UserMapper">
    <insert id="insertUser" parameterType="user">
        insert into user(name, age) values (#{name}, #{age})
    </insert>
    <select id="selectUserAll" resultType="user">
        select id, name, age from user
    </select>
</mapper>

service

@Service
@Transactional
public class UserServiceImpl implements UserService {
    @Autowired
    private UserMapper userMapper;
    @Override
    public void addUser(User user) {
        this.userMapper.insertUser(user);
    }
}

controller

@Controller
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserService userService;
    @RequestMapping("/{page}")
    public String showPage(String page) {
        return page;
    }
    @RequestMapping("/addUser")
    public String addUser(User user) {
        this.userService.addUser(user);
        return "ok";
    }
}