Database operation expected to affect 1 row(s) but actually affected 0 row(s). Data may have been modified or deleted since entities were loaded
asp.net 更新数据时报错:Database operation expected to affect 1 row(s) but actually affected 0 row(s). Data may have been modified or deleted since entities were loaded
原因:Check your object, does it pass Primary Key Null. This Exception is Generally due this reason only.
对象的主键为空,导致不能更新,检查你要更新的对象,查看主键是否为空,或0
Database operation expected to affect 1 row(s) but actually affected 0 row(s). Data may have been modified or deleted since entities were loaded的更多相关文章
- 记录在EF Core级联更新时出现的错误The database operation was expected to affect 1 row(s), but actually affected 0 row(s) (低级错误导致)
错误提示:The database operation was expected to affect 1 row(s), but actually affected 0 row(s); data ma ...
- DataTables warning : Requested unknown parameter '0' from the data source for row 0错误
在做datatables的项目,从后台取得数据后,返回给datatables界面时会报下面的错误: DataTables warning : Requested unknown parameter ' ...
- Mysql [Err] 1118 - Row size too large. The maximum row size for the used table type, not counting BLOBs, is 65535.
对于越来越多的数据,数据库的容量越来越大,压缩也就越来越常见了.在我的实际工作中进行过多次压缩工作,也遇到多次问题,在此和大家分享一下. 首先,我们先说说怎么使用innodb的压缩. 第一,mysql ...
- 安装Access Database Engine后,提示未注册Microsoft.ACE.OLEDB.12.0
未注册Microsoft.ACE.OLEDB.12.0 ,下载安装 Microsoft Access Database Engine:https://www.microsoft.com/en-us/d ...
- DataTables warning (table id = 'myTable'): Requested unknown parameter '0' from the data source for row 0
第一种方式:不用在js里设置列Html: <table id="myTable"> <thead> <tr> <th>Title-1 ...
- Attempting to write a row[5] in the range [0,394] that is already written to disk.
我用POI操作excel写数据,然后就报这个错了 XSSFWorkbook workbook = new XSSFWorkbook(); SXSSFWorkbook sxssfWorkbook = n ...
- [ERR] 1118 - Row size too large (> 8126). Changing some columns to TEXT or BLOB may help. In current row format, BLOB prefix of 0 bytes is stored inline.
昨天,在测试新的数据库时,迁移表遇到了这个问题.现在记录一下解决方案. 1.在配置文件中添加关闭严格模式的配置:sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS ...
- EntityFramework Core解决并发详解
前言 对过年已经无感,不过还是有很多闲暇时间来学学东西,这一点是极好的,好了,本节我们来讲讲EntityFramewoek Core中的并发问题. 话题(EntityFramework Core并发) ...
- Professional C# 6 and .NET Core 1.0 - 38 Entity Framework Core
本文内容为转载,重新排版以供学习研究.如有侵权,请联系作者删除. 转载请注明本文出处:Professional C# 6 and .NET Core 1.0 - 38 Entity Framework ...
随机推荐
- Cache Aside Pattern
Cache Aside Pattern 即旁路缓存是缓存方案的经验实践,这个实践又分读实践,写实践 对于读请求 先读cache,再读db 如果,cache hit,则直接返回数据 如果,cache m ...
- git三、上传项目到github
1.创建github仓库 2.git clone url (克隆仓库到本地,如profect) 3.将项目复制到本地文件夹profect下 4.git add . (添加项目至缓存区) 5.git c ...
- sersync客户端搭建及配置
首先需要自行下载sersync包,地址如下: 谷歌项目地址:https://code.google.com/archive/p/sersync/ 64位下载地址:https://storage.goo ...
- nginx 阻止非自己域名解析到服务器
server模块加入 default_server server { listen 80 default_server; return 403; # return 301 https://$serve ...
- 日志入库-log4j-mysql连接中断问题
mysql5.6 druid1.0.17 log4j 1.2.16 一定时间后无法连接 CommunicationsException: Communications link failure 粗暴 ...
- POJ滑雪
滑雪 Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 97172 Accepted: 36843 Description ...
- DNS 本质
DNS 本质: 层级分布式数据库
- Ant构建原理及build.xml文档描述
最近在改写jmeter,用到ant构建,记录一下. Ant的概念Make命令是一个项目管理工具,而Ant所实现功能与此类似.像make,gnumake和nmake这些编译工具都有一定的缺陷,但是Ant ...
- Python数据基础--列表、元组、字典、函数
一.数据结构 列表(List)和元组 序列是Python中最基本的数据结构.序列中的每个元素都分配一个数字 - 它的位置,或索引,第一个索引是0,第二个索引是1,依此类推. Python有6个序列的内 ...
- webservice常用两种身份验证方式
在项目开发,我们经常会使用WebService,但在使用WebService时我们经常会考虑以下问题:怎么防止别人访问我的WebService?从哪里引用我的WebService?对于第一个问题,就涉 ...