SpringBoot整合MyBatis的代码详解

SpringBoot整合MyBatis

依赖的导入

整合mybatis之前我们需要相对应的导入相关依赖。

<dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.2.1</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
        </dependency>

大致目录

我们首先需要在java的目录和resources下创建mapper文件夹。前者是方法的接口，后者则是xml文件的编写。

例如：

@Mapper
@Repository
public interface UserLoginMapper {
    //查询
    public List<User> queryAll();
    //添加数据
    public int add(User user);
    //根据用户名查询数据
    public User queryByName(String name);

}

xml实现

<mapper namespace="com.example.springbootdemo03.mapper.UserLoginMapper">
    <select id="queryAll" resultType="com.example.springbootdemo03.bean.User">
        select * from student
    </select>
    <insert id="add" parameterType="com.example.springbootdemo03.bean.User">
        insert into student values (#{name},#{password})
    </insert>
    <select id="queryByName" resultType="com.example.springbootdemo03.bean.User">
        select * from student where name = #{name}
    </select>
</mapper>

创建数据库和相对应的Pojo类

数据库格式：

POJO类：

@AllArgsConstructor
@NoArgsConstructor
@Data
public class User {
    private Integer id;
    private String name;
    private  String password;
    private String sex;
    private String fullName;
    private String email;
}

Service层的编写

UserLogin接口的编写：

public interface UserLogin {
    /**
     *查询用户名是否存在
     */
    public Boolean IsExit(String name);
    /**
     * 判断账号密码是否存在
     * @param name
     * @return
     */
    public User Login(String name);
}

UserLoginImpl接口实现类的编写：

@Service
public class UserLoginImpl implements UserLogin {
    //自动注入UserLoginMapper
    @Autowired
    UserLoginMapper userLoginMapper;

    @Override
    public Boolean IsExit(String name){
        if(userLoginMapper.queryByName(name) == null){
            return false;
        }else return true;
    }
    @Override
    public User Login(String name) {
        User user = userLoginMapper.queryByName(name);
        return user;
    }
}

Controller层的编写

我们可以通过Controller层编写来测试登录注册。

@Autowired
    UserLogin userLogin;
    @GetMapping(value = {"/","/login"})
    public String Index(){
        return "login";
    }
    @GetMapping("main.html")
    public String Main(){
        return "index";
    }
    @PostMapping("/login")
    public String Login(User user, HttpSession session, Model model){
        if(!userLogin.IsExit(user.getName())){
            session.setAttribute("msg", "登录失败");
            return "redirect:/login";
        }
        User login = userLogin.Login(user.getName());
        if(user.getName().equals(login.getName()) && user.getPassword().equals(login.getPassword())){
            session.setAttribute("loginUser",user);
            return "redirect:/main.html";
        }
        else {
            session.setAttribute("msg", "登录失败");
            return "redirect:/login";
        }
    }