springBoot中myBatisPlus的使用步骤及示例代码

<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.5.3.1</version>
</dependency>

spring.datasource.url=jdbc:mysql://localhost:3306/your_database_name
spring.datasource.username=your_username
spring.datasource.password=your_password
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
@TableName("user")
public class User {
    @TableId
    private Long id;
    private String name;
    private Integer age;
    // Getters and Setters
    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
}

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.springframework.stereotype.Repository;
@Repository
public interface UserMapper extends BaseMapper<User> {
}

import java.util.List;
public interface UserService {
    List<User> getAllUsers();
    User getUserById(Long id);
    boolean saveUser(User user);
    boolean updateUser(User user);
    boolean deleteUser(Long id);
}

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private UserMapper userMapper;
    @Override
    public List<User> getAllUsers() {
        return userMapper.selectList(null);
    }
    @Override
    public User getUserById(Long id) {
        return userMapper.selectById(id);
    }
    @Override
    public boolean saveUser(User user) {
        return userMapper.insert(user) > 0;
    }
    @Override
    public boolean updateUser(User user) {
        return userMapper.updateById(user) > 0;
    }
    @Override
    public boolean deleteUser(Long id) {
        return userMapper.deleteById(id) > 0;
    }
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;
@RestController
@RequestMapping("/users")
public class UserController {
    @Autowired
    private UserService userService;
    @GetMapping
    public List<User> getAllUsers() {
        return userService.getAllUsers();
    }
    @GetMapping("/{id}")
    public User getUserById(@PathVariable Long id) {
        return userService.getUserById(id);
    }
    @PostMapping
    public boolean saveUser(@RequestBody User user) {
        return userService.saveUser(user);
    }
    @PutMapping
    public boolean updateUser(@RequestBody User user) {
        return userService.updateUser(user);
    }
    @DeleteMapping("/{id}")
    public boolean deleteUser(@PathVariable Long id) {
        return userService.deleteUser(id);
    }
}