【MySQL：org.hibernate.QueryException: query specified join fetching...】解决办法

最新推荐文章于 2022-05-19 16:58:57 发布

原创最新推荐文章于 2022-05-19 16:58:57 发布 · 241 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#MySQL #Hibernate

Java Web 专栏收录该内容

11 篇文章

订阅专栏

本文介绍了一个简单的数据库查询优化案例，通过移除不必要的Fetch操作来提高SQL查询效率。具体做法是在左连接查询中去掉Fetch，从而避免了冗余的数据加载过程。

<query name="???">
<from>
<![CDATA[Select Count(*) From t1
Left Join Fetch t2
]]>
</from>
解决办法：去掉Fetch。

确定要放弃本次机会？

福利倒计时

: :

立减 ¥

普通VIP年卡可用

立即使用

iteye_17447

关注关注

0
点赞
踩
0

收藏

觉得还不错? 一键收藏
0
评论
分享

复制链接

分享到 QQ

分享到新浪微博

扫一扫
举报

举报

专栏目录

多种方法解决Error querying database. Cause: java.sql.SQLException: No value specified for parameter 1

念兮为美

02-18

1万+

多种方法解决Error querying database. Cause: java.sql.SQLException: No value specified for parameter 1

解决：启动Hive出现Exception in thread “main“ java.lang.RuntimeException: org.apache.hadoop.hive.ql.metadata

热门推荐

guihua55的博客

04-09

2万+

在启动Hive时出现如下错误： Logging initialized using configuration in jar:file:/usr/hive/apache-hive-2.1.1-bin/lib/hive-common-2.1.1.jar!/hive-log4j2.properties Async: trueException in thread "main" java.lang.RuntimeException: org.apache.hadoop.hive.ql.metadata.Hive

参与评论您还未登录，请先登录后发表或查看评论

org.hibernate.QueryException: query specified join fetching, but the owner of the fetched associatio

09-28

3551

去掉join语句中的fetch关键字，否则再运行count hql语句中会有异常： Caused by: org.hibernate.QueryException: query specified join fetching, but the owner of the fe

org.hibernate.QueryException: query specified join fetching, but the owner of the fetched association was not present in the sel

JAVA

08-21

9933

错误日志:2009-8-20 12:17:56 org.zkoss.zk.ui.impl.UiEngineImpl handleError:1108严重: >>java.lang.IllegalArgumentException: org.hibernate.QueryException: query specified join fetching, but the owner of th

Hibernate query specified join fetching ...

若水汪洋的java学习博客

03-10

215

写道 hql.append(" from DutyCallover t left join fetch t.duty where 1=1 "); Hibernate报错: query specified join fetching, but the owner of the fetched association was not present in the select list 参...

【解决Hiberate】 query specified join fetching, but the owner of the fetched association..

04-23

6012

运行Hiberante查询报错： query specified join fetching, but the owner of the fetched association was not present in the select list [FromElement{explicit,not a collection join,fetch join,fetch non-lazy prope

Hibernate异常：query specified join fetching, but the owner of the fetched association was not present in the select list

Yokubee的专栏

08-23

1万+

org.hibernate.QueryException: query specified join fetching, but the owner of the fetched association was not present in the select list报这个异常是因为查询时返回的对象不包含有该join fetch后面的对象，因此可以将fetch删除就可以啦。这里的fetch就是将fetch后面的对象setter到查询返回的对象中。因此当不存在包含时，就会该报错！//这里Student和T

jsp连接数据库出现java.lang.ClassNotFoundException: com.mysql.jdbc.Driver异常以及不同情况的排错解决方法

Xmumu_的博客

10-31

4422

今天在开心的写项目的时候，我想在jsp页面上测试一下我连接数据库成功没有，所以呢，今天又是排错成功的一天，所以写篇博客小小庆祝一下???? 以下是我在index.jsp上写好了代码： <%@ page import="java.sql.Connection" %> <%@ page import="java.sql.DriverManager" %> <%@ page import="java.sql.SQLException" %><%-- Created

Caused by: java.sql.SQLException: No value specified for parameter 2

游海东的技术专栏

02-13

5500

1、错误描述at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invo

idea 创建maven项目执行mvn命令：org.apache.maven.project.ProjectBuildingException:

但行好事莫问前程

03-01

5229

1、异常信息： org.apache.maven.project.ProjectBuildingException: Some problems were encountered while processing the POMs: 所有配置均无问题，后显示连接不到中央仓库，配置私服也是找不到，总之就是 maven项目齐刷刷红红火火 2、异常原因：各种找了之后发现了是.....唉一言...

query specified join fetching, but the owner of the fetched association was not present in the selec

Olizee的专栏

10-16

1844

java.lang.IllegalArgumentException: org.hibernate.QueryException: query specified join fetching, but the owner of the fetched association was not present in the select list 可能的原因：fetch 与 count 一起使用

query specified join fetching, but the owner of the fetched association was not present in the selec...

weixin_30435261的博客

01-15

283

报标题的错误,是因为在 select count的时候,不需要fetch 所以在取完count以后,再把fetch加进去,变成left join fetch /** * 请把jhql以o为返回对象，例如“from user o where” * * @param jhql * @param pageSize * @param page * @return */ publ...

hibernate异常Hibernate异常：query specified join fetching, but the owner of the fetched association was n

duyulong12的专栏

12-08

1493

项目中想级联查询表中的某些字段发生Hibernate异常：query specified join fetching, but the owner of the fetched association was not present in the select list异常，查了很多资料没有解决最后还是自己乱碰解决了。现记录如下： new StringBuffer()

jpa Specification fetch查询报错，query specified join fetching, but the owner of the fetched association

turbos_的博客

05-19

1299

jpa Specification fetch查询报错，query specified join fetching, but the owner of the fetched association was not present in the selectjpa Specification fetch查询报错，query specified join fetching, but the owner of the fetched association was not present in the sele

query specified join fetching, but the owner of the fetched association was not

germmy-神一样的开发

11-28

495

有形如下面的HQL语句： Query query = session.createQuery(“SELECT COUNT(*) AS count FROM Employee I inner join I.user O”) 执行完后报RT的错误，解决方案就是把fetch去掉就行了。 refurl:http://bbs.csdn.net/topics/310060...

Hibernate异常：query specified join fetching, but the owner of the fetched association was not present

mrdu_somefun的博客

11-03

677

通过内连接返回dept对象部分属性的时候报错，在这种情况下把inner join fetch中的fetch去掉，就可以了 List list = session.createQuery("select d.deptName from Dept d inner join d.emps").list();

hql报错--HibernateQueryException

淡墨银痕的博客

10-29

955

错误信息 HibernateQueryException query specified join fetching, but the owner of the fetched

Caused by: org.hibernate.AnnotationException: No identifier specified for entity: com.s59.pojo.Book

05-14

这个错误通常是由于在实体类中没有指定主键而引起的。在Hibernate中，每个实体类必须有一个主键，以便能够在数据库中唯一标识每个实体。请检查你的实体类中是否指定了主键，主键可以使用@Id注解指定。例如： ``` @Entity public class Book { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; // other fields and methods } ``` 在这个例子中，我们使用@Id注解指定了主键，并使用@GeneratedValue注解指定了主键的生成策略。你可以根据你的需求选择适合的主键生成策略。