Database 如何从ElementCollection中提取数据

我试图从StandartFont中包含的ElementCollection中提取数据

public class DBFonts {

@Id
@GeneratedValue(strategy= GenerationType.AUTO)
private long id;
private String nameFont;


@ElementCollection
@CollectionTable(
        name="StandartFont",
        joinColumns=@JoinColumn(name="Fonts_id")
@Lob @Basic(fetch = FetchType.LAZY)
@Column(length=100000)
private List<byte[]> StandartFonts; }

公共类dbfont{
@身份证
@GeneratedValue（策略=GenerationType.AUTO）
私人长id；
私有字符串名称字体；
@元素集合
@收集表(
name=“StandartFont”，
joinColumns=@JoinColumn（name=“font\u id”）
@Lob@Basic（fetch=FetchType.LAZY）
@列（长度=100000）
私有列表标准字体；}

存储库：

public interface FontRepo extends JpaRepository<DBFonts,Long> {
   List<byte[]> findByStandartFonts(Long fonsId);
}

 HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect
Hibernate: alter table font add constraint FKpcplr5ixrmh5lbjx0e6peoqo4 foreign key (user_id) references usr (id)
Hibernate: alter table standart_font add constraint FKq7nxy6see56tp2y997fwmsewq foreign key (fonts_id) references font (id)
2018-12-06 16:15:54.338  INFO 6168 --- [  restartedMain] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2018-12-06 16:15:54.884  WARN 6168 --- [  restartedMain] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'addFont': Unsatisfied dependency expressed through field 'fontRepo'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'fontRepo': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List spring_mvc.entity.FontRepo.findByStandartFonts(java.lang.Long)! Unable to locate Attribute  with the the given name [standartFonts] on this ManagedType [spring_mvc.entity.DBFonts]
2018-12-06 16:15:54.884  INFO 6168 --- [  restartedMain] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'default'
2018-12-06 16:15:54.886  INFO 6168 --- [  restartedMain] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Shutdown initiated...
2018-12-06 16:15:54.896  INFO 6168 --- [  restartedMain] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Shutdown completed.
2018-12-06 16:15:54.898  INFO 6168 --- [  restartedMain] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2018-12-06 16:15:54.916  INFO 6168 --- [  restartedMain] ConditionEvaluationReportLoggingListener : 

    Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
    2018-12-06 16:15:54.928 ERROR 6168 --- [  restartedMain] o.s.boot.SpringApplication               : Application run failed

    org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'addFont': Unsatisfied dependency expressed through field 'fontRepo'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'fontRepo': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List spring_mvc.entity.FontRepo.findByStandartFonts(java.lang.Long)! Unable to locate Attribute  with the the given name [standartFonts] on this ManagedType [spring_mvc.entity.DBFonts]
        at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:586) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]

at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.0.5.RELEASE.jar:2.0.5.RELEASE]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'fontRepo': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List spring_mvc.entity.FontRepo.findByStandartFonts(java.lang.Long)! Unable to locate Attribute  with the the given name [standartFonts] on this ManagedType [spring_mvc.entity.DBFonts]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1699) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]

公共接口FontRepo扩展了JpaRepository{
列出findByStandartFonts（长字体）；
}
HH000400:使用方言：org.hibernate.dialogue.mysql5dialogue
Hibernate:alter table font add constraint FKPCPPLR5IXRMH5LBJX0E6PEOQO4外键（用户id）引用usr（id）
Hibernate:alter table standart_font添加约束FKQ7NXY6请参见56TP2Y997FWMSEWQ外键（fonts_id）引用字体（id）
2018-12-06 16:15:54.338信息6168---[restartedMain]j.LocalContainerEntityManagerFactoryBean:初始化了持久化单元“默认”的JPA EntityManagerFactory
2018-12-06 16:15:54.884警告6168---[重新启动主站]ConfigServletWebServerApplicationContext:在上下文初始化期间遇到异常-取消刷新尝试：org.springframework.beans.factory.unsatifiedDependencyException:创建名为“addFont”的bean时出错：通过字段“fontRepo”表示的未满足的依赖项；嵌套异常为org.springframework.beans.factory.BeanCreationException:创建名为“fontRepo”的bean时出错：调用init方法失败；嵌套异常为java.lang.IllegalArgumentException:无法创建方法公共抽象java.util.List spring_mvc.entity.fontRepo.findByStandartFonts（java.lang.Long）的查询！无法找到具有给定名称的属性[standartFonts]在此ManagedType上[spring\u mvc.entity.DBFonts]
2018-12-06 16:15:54.884信息6168---[restartedMain]j.LocalContainerEntityManagerFactoryBean:关闭持久化单元“默认”的JPA EntityManagerFactory
2018-12-06 16:15:54.886信息6168---[restartedMain]com.zaxxer.hikari.HikariDataSource:hikaripol-1-已启动关机。。。
2018-12-06 16:15:54.896信息6168---[restartedMain]com.zaxxer.hikari.HikariDataSource:hikaripol-1-关闭完成。
2018-12-06 16:15:54.898信息6168---[restartedMain]o.apache.catalina.core.StandardService:停止服务[Tomcat]
2018-12-06 16:15:54.916信息6168---[restartedMain]条件评估报告日志监听器：
启动ApplicationContext时出错。若要显示条件报告，请在启用“调试”的情况下重新运行应用程序。
2018-12-06 16:15:54.928错误6168---[restartedMain]o.s.boot.SpringApplication:应用程序运行失败
org.springframework.beans.factory.unsatifiedPendencyException:创建名为“addFont”的bean时出错：通过字段“fontRepo”表示的未满足依赖项；嵌套异常为org.springframework.beans.factory.BeanCreationException:创建名为“fontRepo”的bean时出错：调用init方法失败；嵌套异常为java.lang。IllegalArgumentException:无法为方法public abstract java.util.List spring_mvc.entity.FontRepo.findByStandartFonts（java.lang.Long）创建查询！无法在此ManagedType[spring_mvc.entity.DBFonts]上找到具有给定名称[standartFonts]的属性
在org.springframework.beans.factory.annotation.AutoWiredNotationBeanPostProcessor$AutoWiredFeldElement.inject（AutoWiredNotationBeanPostProcessor.java:586）~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
在org.springframework.boot.devtools.restart.RestartLauncher.run（RestartLauncher.java:49）[spring-boot-devtools-2.0.5.RELEASE.jar:2.0.5.RELEASE]
原因：org.springframework.beans.factory.BeanCreationException:创建名为“fontRepo”的bean时出错：调用init方法失败；嵌套异常为java.lang.IllegalArgumentException:未能为方法公共抽象java.util.List spring_mvc.entity.fontRepo.findByStandartFonts（java.lang.Long）创建查询！在此ManagedType[spring\u mvc.entity.DBFonts]上找不到具有给定名称[standartFonts]的属性
在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean（AbstractAutowireCapableBeanFactory.java:1699）~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]

它不工作，如何正确提取数据

能用吗？： 从标准字体中选择标准字体，其中字体id=？

---

如何在@Query

中编写此代码Spring在类

DBFonts

中找不到名为

standartFonts

的属性，这就是为什么它无法使用

存储库创建BEN

在上找不到具有给定名称[standartFonts]的属性 此ManagedType[spring\u mvc.entity.DBFonts]

Spring使用反射从您的存储库中获取方法名称（

findByStandartFonts

），并对其进行解析：

findBy

其方法

选择
和
StandartFonts
Spring解析为
StandartFonts
，并尝试在您的
@实体中查找此字段

另外，在
id
字段中，请使用
Long
而不是
Long
。这是一个很好的做法。
并在java代码中使用
camelCase
。
您能扩展它吗？请将字段“StandartFonts”重命名为“StandartFonts”WARN 8412---[nio-8080-exec-4]。m.m.a.ExceptionHandlerExceptionResolver:由处理程序执行引起的已解决异常：org.springframework.dao.InvalidDataAccessApiUsageException:参数值[2]与预期类型[[B（n/a）]不匹配；嵌套异常为java.lang.IllegalArgumentException:参数值[2]与预期类型[[B（n/a）]不匹配您能给出完整的stacktrace吗？已满！！！！！警告8412---[nio-8080-exec-4].m.m.a.ExceptionHandlerExceptionResolver:由处理程序执行引起的已解决异常：org.springframework.dao.Invalid