常见商业模式
B2C： 两个角色，管理员和普通用户
管理员：添加、修改、删除
普通用户：查询
核心模块：课程模块
B2B2C: 商家到商家再到用户，例如：京东
角色： 普通用户、可以买自营、可以买普通商家
项目功能模块
Mybatis-plus
前期准备
添加依赖
<dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </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>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.5.3.1</version> </dependency> </dependencies>
设置启动类并加入mapper包扫描
@SpringBootApplication @MapperScan("com.atguigu.springbootmybatisplus.mapper") public class SpringbootMybatisPlusApplication { public static void main(String[] args) { SpringApplication.run(SpringbootMybatisPlusApplication.class, args); } }
建表
CREATE TABLE user ( id BIGINT(20) NOT NULL COMMENT '主键ID', name VARCHAR(30) NULL DEFAULT NULL COMMENT '姓名', age INT(11) NULL DEFAULT NULL COMMENT '年龄', email VARCHAR(50) NULL DEFAULT NULL COMMENT '邮箱', PRIMARY KEY (id) ); INSERT INTO user (id, name, age, email) VALUES (1, 'Jone', 18, 'test1@baomidou.com'), (2, 'Jack', 20, 'test2@baomidou.com'), (3, 'Tom', 28, 'test3@baomidou.com'), (4, 'Sandy', 21, 'test4@baomidou.com'), (5, 'Billie', 24, 'test5@baomidou.com');
写实体类
@Data @Getter @Setter @ToString public class User { private Long id; private String name; private Integer age; private String email; }
写mapper类
public interface UserMapper extends BaseMapper<User> { }
查询测试
