Mybatis-Plus：快速入门+thymeleaf前端渲染

前言：Mybatis-Plus是Mybatis的增强插件，具有许多强大功能：如内置代码生成器，分页插件，CRUD操作等，专为偷懒而生官网链接

~demo效果：基于官网的快速入门，体验Mybatis-plus的便捷，结合SpringBoot渲染前端展示查询效果

1.项目所需依赖

 
        
        
        
            org.springframework.boot
            spring-boot-starter-jdbc
        

        
            mysql
            mysql-connector-java
        

        
        
            com.baomidou
            mybatis-plus-boot-starter
            3.0.5
        

        
            org.projectlombok
            lombok
        

        
            org.springframework.boot
            spring-boot-starter-thymeleaf
        
        
            org.thymeleaf.extras
            thymeleaf-extras-java8time
        
        
            org.springframework.boot
            spring-boot-starter-web
        

        
            org.springframework.boot
            spring-boot-starter-test
            test
        
    

2.配置数据源+连接数据库

• application.yml

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/mybatis_plus?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
    username: root
    password: 123456
    driver-class-name: com.mysql.cj.jdbc.Driver

• sql代码

SET FOREIGN_KEY_CHECKS=0;

-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
  `id` bigint(20) NOT NULL COMMENT '主键ID',
  `name` varchar(30) DEFAULT NULL COMMENT '姓名',
  `age` int(11) DEFAULT NULL COMMENT '年龄',
  `email` varchar(50) DEFAULT NULL COMMENT '邮箱',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES ('1', 'Jone', '18', '[email protected]');
INSERT INTO `user` VALUES ('2', 'Jack', '20', '[email protected]');
INSERT INTO `user` VALUES ('3', 'Tom', '28', '[email protected]');
INSERT INTO `user` VALUES ('4', 'Sandy', '21', '[email protected]');
INSERT INTO `user` VALUES ('5', 'Billie', '24', '[email protected]');

3.编写Mapper继承自BaseMapper

@Mapper
@Repository
public interface UserMapper extends BaseMapper {
}

~ 测试

@SpringBootTest
class MybatisPlusSpringbootApplicationTests {
    @Autowired
    UserMapper userMapper;
    @Test
    void contextLoads() {
        // 参数是一个条件构造器 null 为查询表中全部数据
        List users = userMapper.selectList(null);
        // 语法糖
        users.forEach(System.out::println);
    }
}

4.编写前端控制器

@Controller
public class UserController {

    @Autowired
    UserMapper userMapper;

    /**
     * 查询所有用户
     * @return
     */
    @RequestMapping("/user/list")
    public String userList(Model model){
        List users = userMapper.selectList(null);
        model.addAttribute("user_lists", users);
        return "user/list";
    }
}

@Controller
public class RouteController {

    // 首页
    @RequestMapping({"/","/index"})
    public String index(){
        return "dashboard";
    }
}

5.部分前端页面接收参数

        

            
后台管理员列表
            

                

                    

                    

                        
ID
                        
姓名
                        
年龄
                        
邮箱
                        
操作
                    
                    

                    
                    

                    

                        

                        

                        

                        

                        

                            修改
                             | 
                            删除
                        
                    
                    
                
            
        

~效果

查询用户集合