mybatis搭建demo

# SQL准备

/*
 Navicat Premium Data Transfer

 Source Server         : localhost
 Source Server Type    : MySQL
 Source Server Version : 80029
 Source Host           : localhost:3306
 Source Schema         : ssm

 Target Server Type    : MySQL
 Target Server Version : 80029
 File Encoding         : 65001

 Date: 24/03/2024 10:01:31
*/

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user`  (
  `id` bigint NOT NULL COMMENT '主键ID',
  `name` varchar(30) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '姓名',
  `age` int NULL DEFAULT NULL COMMENT '年龄',
  `email` varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL COMMENT '邮箱',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES (1, 'Jone', 18, 'test1@baomidou.com');
INSERT INTO `user` VALUES (2, 'Jack', 20, 'test2@baomidou.com');
INSERT INTO `user` VALUES (3, 'Tom', 28, 'test3@baomidou.com');
INSERT INTO `user` VALUES (4, 'Sandy', 21, 'test4@baomidou.com');
INSERT INTO `user` VALUES (5, 'Billie', 24, 'test5@baomidou.com');

SET FOREIGN_KEY_CHECKS = 1;

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# 主类

@RestController
public class UserController {
    
    @Autowired
    private UserMapper userMapper;
    
    @GetMapping("/haha")
    public String getUser() {
        List<Userdao> userdaos = userMapper.queryUserList();
        for (Userdao userdao : userdaos) {
            System.out.println(userdao);
        }
        return "successs";
    }
}

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@Data
public class Userdao {
    private Long id;
    private String name;
    private Integer age;
    private String email;
}

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@Mapper
@Repository
public interface UserMapper {
    //只是整合测试，为了可读性，只写了一个方法
    List<Userdao> queryUserList();
}

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@SpringBootApplication
@MapperScan("com.ziki.mybatis_delete.mapper")
public class MybatisDeleteApplication {

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

}

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# 配置

spring:
  datasource:
    username: root
    url: jdbc:mysql://localhost:3306/ssm?serverTimezone=UTC
    password: root
    driver-class-name: com.mysql.cj.jdbc.Driver
mybatis:
  mapper-locations: classpath:mapper/*.xml
  type-aliases-package: com.ziki.mybatis_delete.dao

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# mapper文件

<?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="！！！！！！！！！！！！！">

    <select id="queryUserList" resultType="！！！！！！！！！！！">
        select * from user
    </select>
</mapper>

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