<dependencies>
    <!-- Spring Boot Starter -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
    </dependency>
    <!-- MyBatis Plus 依賴 -->
    <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus-boot-starter</artifactId>
        <version>3.5.3</version>
    </dependency>
    <!-- MySQL 驅(qū)動(dòng) -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <scope>runtime</scope>
    </dependency>
    <!-- Druid 數(shù)據(jù)源 -->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid-spring-boot-starter</artifactId>
        <version>1.2.11</version>
    </dependency>
</dependencies>

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/demo_db?useSSL=false&serverTimezone=UTC
    username: root
    password: root123
    driver-class-name: com.mysql.cj.jdbc.Driver
  mybatis-plus:
    configuration:
      map-underscore-to-camel-case: true # 開(kāi)啟駝峰命名
      log-impl: org.apache.ibatis.logging.stdout.StdOutImpl # 開(kāi)啟 SQL 日志

CREATE TABLE user (
    id BIGINT PRIMARY KEY AUTO_INCREMENT,
    name VARCHAR(50) NOT NULL,
    age INT NOT NULL,
    email VARCHAR(100) UNIQUE
);

import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;
@Data
@TableName("user") // 指定數(shù)據(jù)庫(kù)表名
public class User {
    @TableId
    private Long id; // 主鍵
    private String name;
    private Integer age;
    private String email;
}

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface UserMapper extends BaseMapper<User> {
}

import com.baomidou.mybatisplus.extension.service.IService;
public interface UserService extends IService<User> {
}

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.stereotype.Service;
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {
}

import org.springframework.web.bind.annotation.*;
import java.util.List;
@RestController
@RequestMapping("/users")
public class UserController {
    private final UserService userService;
    public UserController(UserService userService) {
        this.userService = userService;
    }
    // 查詢所有用戶
    @GetMapping
    public List<User> getAllUsers() {
        return userService.list();
    }
    // 添加用戶
    @PostMapping
    public boolean addUser(@RequestBody User user) {
        return userService.save(user);
    }
}

import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
@GetMapping("/page")
public IPage<User> getUserPage(@RequestParam int pageNum, @RequestParam int pageSize) {
    return userService.page(new Page<>(pageNum, pageSize));
}

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
@GetMapping("/search")
public List<User> searchUser(@RequestParam String name) {
    return userService.list(new LambdaQueryWrapper<User>()
            .like(User::getName, name) // 模糊查詢
            .orderByDesc(User::getAge)); // 按年齡倒序
}

import java.util.Arrays;
@PostMapping("/batch")
public boolean batchInsert() {
    List<User> users = Arrays.asList(
        new User(null, "Alice", 25, "alice@example.com"),
        new User(null, "Bob", 30, "bob@example.com")
    );
    return userService.saveBatch(users);
}