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springboot+JPA

news 2025/8/13 8:55:17

JDK17+Springboot3.4.6

<parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>3.4.6</version><relativePath/>
</parent><!--JPA起步依赖-->
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

application-dev.yaml

server:port: 8896spring:datasource:username: rootpassword: rooturl: jdbc:mariadb://ip1.ip2.ip3.ip4:3306/springbootJPA?useUnicode=true&characterEncoding=UTF-8driver-class-name: org.mariadb.jdbc.Driver#  方言jpa:properties:hibernate:dialect: org.hibernate.dialect.MySQL8Dialect

bean Balance

import jakarta.persistence.*;
import lombok.Data;//实体类与表映射
@Entity(name = "balance_details")
@Data
public class Balance {//主键id@Id//设置主键自增//GenerationType.AUTO 策略在 MySQL 环境下错误地使用了 SEQUENCE（序列）生成方式，而 MySQL 不支持 原生的序列（Sequence）对象//@GeneratedValue(strategy = GenerationType.AUTO)//识别策略可以在mysql上用@GeneratedValue(strategy = GenerationType.IDENTITY)private Integer id;//属性名与表字段名不一致@Column(name = "account_num")private String accountNum;private double amount;private String type;private String comment;
}

repository BalanceRepository

import com.ben.bean.Balance;
import org.springframework.data.jpa.repository.JpaRepository;/**Balance 操作的实体类, Integer 当前实体类被@id注解修饰也就是主键的数据类型*/
public interface BalanceRepository extends JpaRepository<Balance, Integer> {
}

接口 IBalance

public interface IBalance {Balance saveOne(Balance balance);
}

接口实现类 BalanceService

@Service
public class BalanceService implements IBalance {@Autowiredprivate BalanceRepository balanceRepository;@Override@Transactionalpublic Balance saveOne(Balance balance) {return balanceRepository.save(balance);}
}

BalanceController

@RestController
public class BalanceController {@Autowiredprivate BalanceService balanceService;@PostMapping("/save")public Balance save(@RequestBody Balance balance) {Balance balance1 = balanceService.saveOne(balance);return balance1;}
}

postman调用

post请求
localhost:8896/saverequest body：
{"accountNum":"abcd123","amount":12.34,"type":"prod","comment":"test"
}

数据库表

create table balance_details
(id          int auto_incrementprimary key,account_num varchar(30)  null,type        varchar(10)  null,comment     varchar(100) null,amount      double       null
);