以下是一个简单的Spring Boot + MyBatis-Plus + PostgreSQL的CRUD实现示例：
- 首先，在
pom.xml中添加依赖：
<dependencies>
<!-- Spring Boot Starter -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<!-- MyBatis-Plus Starter -->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.x.x</version>
</dependency>
<!-- PostgreSQL Starter -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
</dependencies>- 配置
application.properties或application.yml：
spring.datasource.url=jdbc:postgresql://localhost:5432/your_database
spring.datasource.username=your_username
spring.datasource.password=your_password
spring.datasource.driver-class-name=org.postgresql.Driver- 创建一个实体类对应数据库表：
import com.baomidou.mybatisplus.annotation.TableName;
@TableName("user")
public class User {
private Long id;
private String name;
private Integer age;
private String email;
// 省略getter和setter方法
}- 创建一个Mapper接口：
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface UserMapper extends BaseMapper<User> {
// MyBatis-Plus会自动处理CRUD操作
}- 在Spring Boot启动类中添加
@MapperScan注解：
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan("com.yourpackage.mapper")
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}- 使用Mapper进行CRUD操作：
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class UserService {
@Autowired
private UserMapper userMapper;
public boolean saveUser(User user) {
return userMapper.insert(user) > 0;
}
public User getUser(Long id) {
return userMapper.selectB