HibernateSystemException: Unknown entity: 使用Hibernate插入数据库报错

Hibernate报错：

org.springframework.orm.hibernate5.HibernateSystemException: Unknown entity: com.demo.DemoEntity; nested exception is org.hibernate.MappingException: Unknown entity: com.demo.DemoEntity
    at org.springframework.orm.hibernate5.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:267)
    at org.springframework.orm.hibernate5.HibernateTemplate.doExecute(HibernateTemplate.java:370)
    at org.springframework.orm.hibernate5.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:334)
    at org.springframework.orm.hibernate5.HibernateTemplate.save(HibernateTemplate.java:613)
    at com.demo.HService.addDemo(HService.java:25)

问题原因：

原因是 HIbernate 找不到 com.demo.DemoEntity 实体映射的表，无法获取到映射关系

解决办法：

添加 Hibernate 的 hbm.xml 配置文件，用于指定映射关系。

Demon.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<hibernate-mapping xmlns="http://www.hibernate.org/xsd/hibernate-mapping"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.hibernate.org/xsd/hibernate-mappinghttp://www.hibernate.org/xsd/hibernate-mapping/hibernate-mapping-4.0.xsd"><class name="com.single.bean.DemoEntity" table="FDW_DEMO"><id name="ID" type="string" column="ID" length="60" /><property name="fdw_name" type="string" column="FDW_NAME" length="60"/></class>
</hibernate-mapping>

实体类

package com.single.bean;import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;/*** @program: assetcheck-backend* @description:* @author: fudingwei* @create: 2024-06-19 09:31**/
@Table(name = "FDW_DEMO")
@Entity
public class DemoEntity {@Id@Column(name = "ID")private String ID;@Column(name = "FDW_NAME")private String fdw_name;public String getID() {return ID;}public void setID(String ID) {this.ID = ID;}public String getFdw_name() {return fdw_name;}public void setFdw_name(String fdw_name) {this.fdw_name = fdw_name;}public DemoEntity(String ID, String fdw_name) {this.ID = ID;this.fdw_name = fdw_name;}public DemoEntity() {}@Overridepublic String toString() {return "DemoEntity{" +"ID='" + ID + '\'' +", fdw_name='" + fdw_name + '\'' +'}';}
}

测试Service

package com.single.service;import com.single.bean.DemoEntity;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.orm.hibernate5.HibernateTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;import java.util.UUID;/*** @program: assetcheck-backend* @description:* @author: fudingwei* @create: 2024-06-19 09:28**/
@Service
public class HService {@AutowiredHibernateTemplate hibernateTemplate;@Transactionalpublic String addDemo(){DemoEntity demoEntity = new DemoEntity();demoEntity.setID(UUID.randomUUID().toString());demoEntity.setFdw_name("fudingwei");hibernateTemplate.save(demoEntity);return "success";}}