`

ids for this class must be manually assigned befor

阅读更多
ids for this class must be manually assigned before calling save()
hibernate出现这个错误的原因有可能因为,你的表中有个主键。 但是你插入的(调用save)时那个值是null
分享到:
评论
1 楼 xiaojianhx 2011-05-11  
自己写的还是转过来的?

相关推荐

    SSH整合项目中容易出现的错误

    1. org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save() 这个错误是由于在Hibernate的mapping文件中,元素没有正确配置,缺少了其子元素的配置...

    工作周报10221

    - **Hibernate逆向工程**:解决`ids for this class must be manually assigned`错误,修改了自动生成的ID配置,添加了`dynamic-update`和`dynamic-insert`属性以优化数据库操作。 - **Spring与Hibernate集成**:...

    ssh框架报错分析集合

    1. `org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save()` 这个异常通常是因为Hibernate在尝试保存对象时,发现对象的ID没有被正确地设置或生成...

    hibernate常见问题及处理.doc

    4. `org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save():` 此异常意味着在尝试保存对象前,对象的主键没有被正确设置。通常,这是由于在映射...

    框架集合错误解决方案

    org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save() ``` **问题描述:** 当尝试保存一个实体对象时,如果该对象的`id`字段没有被手动赋值,...

    dev_ids.tsv

    glue_data的MRPC数据集映射文件

    Python For ArcGIS 数据

    After that, the next assignment will be to answer the same question based on monthly species inventory datasets for fi sh and invertebrates.Performing this process manually for one dataset could be ...

    vb写的ole 回调函数

    'manually and everything should be set for your client app to call the server through 'OLE. 'Note6: Every time you build a new exe of your server, VB will generate a new 'unique ID for each of its ...

    DevExpress VCL_18.2.5.part2,包含XE10.3.1下的快速安装项目文件

    XE10.3.1 安装方法: 1、打开XE,在菜单Tools\Options对话框中的Environment Options\Delphi Options\Library中添加“【下载包解压目录】\Sources”; 2、打开DevExpress VCL RS26工程包,在Project Manager窗口中...

    rubygems-master-(1).zip_GEM

    You must have an installation of RubyGems before this update can be applied. See Gem for information on RubyGems (or `ri Gem`) To upgrade to the latest RubyGems, run: $ gem update --system # you ...

    ULPBench - Beyond the Data Sheets of Ultra-Low-Power MCU.pdf

    Note: the USB driver must be manually installed because the USB driver is not recognized by the PC. The appropriate drivers are located in the /bin/USB_CDC folder. Connect the terminals +3 V (VCC) ...

    IOS5 Programming Cookbook

    - **Error Handling**: Compilation errors are common and must be addressed before your app can run. Common issues include syntax errors, missing imports, and type mismatches. ### 4. Running iOS Apps ...

    网络修复winsrepair

    1) The origin of this software must not be misrepresented; you must not claim that you wrote the original software. 2) You must not alter the software, user license or installer in any way. 3) This ...

    Json NET 6 0 R8 For NET 2 0 4 5

    or the JSON is radically different from your class and you need to manually read and write from your objects.">Json.NET is a popular high-performance JSON framework for .NET Features Flexible JSON ...

    unidac 5.3.10

    Versions of UniDAC with Source Code must be installed manually. For more information, see the Installation topic of the UniDAC Help documentation. It is important to know that UniDAC, ODAC, SDAC, ...

    A Reinforcement Learning Framework for Medical Image Segmentation.pdf

    this way can be used as valuable knowledge to fill a Q-matrix. The reinforcement learning agent can use this knowledge for similar ultrasound images as well. The results demonstrate high potential for...

    selenium-dotnet-2.45.0.zip

    From this point forward, users are expected to manually install the SafariDriver extension into their Safari installation in order to drive the browser. This is due to Apple's changes in ...

    Json.NET 6.0 R3 For.NET(2.0-4.5)

    LINQ to JSON is good for situations where you are only interested in getting values from JSON, you don't have a class to serialize or deserialize to, or the JSON is radically different from your class...

    基于ssm+mysql的编程类在线答题系统源码数据库论文.docx

    1. User authentication and authorization: Students and teachers should be able to log in securely, with roles and permissions assigned accordingly. 2. Exam creation and management: Teachers should be ...

    LCTF软件备份VariSpec™ Liquid Crystal Tunable Filters

    For this reason, the functions that handle these actions offer the option of waiting until the action is complete before returning (so-called synchronous operation); although they can be called in an ...

Global site tag (gtag.js) - Google Analytics