An exception occurred in the database while saving changes for context type 'blog_file_api.Services.BlogDB'. Microsoft.EntityFrameworkCore.DbUpdateException: An error occurred while saving the entity changes. See the inner exception for details.报错意味着什么

时间: 2023-03-15 19:21:06 浏览: 297
这个错误消息表明在将变更保存到数据库中时，发生了一个异常。这可能是因为在保存变更时发生了错误，或者是因为数据库中的某些数据无效或不一致。为了确定问题的具体原因，应该检查内部异常的详细信息。这些信息可能会提供有关发生错误的原因以及如何解决问题的更多信息。
相关问题

Microsoft.EntityFrameworkCore.DbUpdateException:“An error occurred while saving the entity changes. See the inner exception for details.”

当在使用Microsoft.EntityFrameworkCore进行数据库操作时，可能会遇到`DbUpdateException`这样的错误。这个异常通常表示在尝试将数据保存到数据库时发生了错误，可能是由于多种原因导致的，比如更新的数据违反了数据库约束规则（如唯一性、外键引用等）、网络连接问题、并发控制冲突等。 具体错误信息中的"See the inner exception for details."意味着你需要查看`DbUpdateException`的 Inner Exception 来获取更详细的错误原因，这可能包括具体的 SQL 错误消息、受影响的行数或者违反的具体规则。 要解决这个问题，首先需要检查异常详情，找出引发错误的操作，然后排查相关的数据库设置、实体状态管理或者是业务逻辑。可能的解决方案包括修复违反的约束、处理并捕获潜在的并发冲突、确保所有字段已正确填充或验证等。

fail: 2023/7/14 14:31:33.417 CoreEventId.QueryIterationFailed[10100] (Microsoft.EntityFrameworkCore.Query) An exception occurred while iterating over the results of a query for context type 'iMES.Core.EFDbContext.SysDbContext'. System.InvalidOperationException: There is already an open DataReader associated with this Connection which must be closed first. at Microsoft.Data.SqlClient.SqlInternalConnectionTds.ValidateConnectionForExecute(SqlCommand command) at Microsoft.Data.SqlClient.SqlConnection.ValidateConnectionForExecute(String method, SqlCommand command) at Microsoft.Data.SqlClient.SqlCommand.ValidateCommand(Boolean isAsync, String method) at Microsoft.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry, String method) at Microsoft.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) at Microsoft.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior) at Microsoft.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior) at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReader(RelationalCommandParameterObject parameterObject) at Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable`1.Enumerator.InitializeReader(Enumerator enumerator) at Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable`1.Enumerator.<>c.<MoveNext>b__21_0(DbContext _, Enumerator enumerator) at Microsoft.EntityFrameworkCore.SqlServer.Storage.Internal.SqlServerExecutionStrategy.Execute[TState,TResult](TState state, Func`3 operation, Func`3 verifySucceeded) at Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable`1.Enumerator.MoveNext()

根据您提供的信息，出现了一个异常，提示已经有一个与该连接关联的打开的 DataReader，必须先关闭它。 这个问题通常是由于在使用 Entity Framework 进行查询时，存在未关闭的 DataReader 导致的。DataReaders 是用于读取数据库查询结果的对象，在使用完毕后需要显式地关闭。 要解决这个问题，您可以尝试以下几点： 1. 确保在使用完 DataReader 后，及时调用其 Close() 或 Dispose() 方法来关闭它。可以使用 using 语句来自动处理这个操作，确保 DataReader 在使用完毕后被正确关闭。 2. 检查代码中是否存在嵌套的查询或循环查询，确保每个查询都正确关闭其对应的 DataReader。 3. 如果您的代码中使用了多个数据库连接对象，确保每个连接对象都能正确地关闭和释放资源。 4. 如果您使用的是异步查询，需要注意在异步操作完成后关闭 DataReader。 需要注意的是，以上建议是一般情况下解决该异常的方法。根据具体的代码和业务逻辑，您可能需要进一步检查和调整代码以确保 DataReader 的正确关闭。 希望以上建议对解决您的问题有所帮助！如果您需要更详细的帮助，请提供更多关于您的代码和查询的信息。
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根据您提供的错误信息，出现了两个异常：IndexError和ClientError。IndexError表示连接池中没有可用的连接，而ClientError表示由于身份验证失败而导致未经授权的客户端。 解决这些问题的步骤如下： ...

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这个错误提示是 MyBatis 在执行 SQL 查询时发生了语法错误。错误位置在查询语句的 WHERE 子句中，可能是由于 SQL 语法不正确导致的。具体地说，错误信息中提示说在第 5 行附近有语法错误，而查询语句中的 WHERE 子句...

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HTTP Status 500 – Internal Server Error Type Exception Report Message Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: Description The server encountered an unexpected condition that prevented it from fulfilling the request. Exception org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. Cause: java.lang.NullPointerException: Pool must not be null. ### The error may exist in mapper/banner.xml ### The error may involve com.dao.BannerDAO.getAllBanner ### The error occurred while executing a query ### Cause: java.lang.NullPointerException: Pool must not be null. org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982) org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) javax.servlet.http.HttpServlet.service(HttpServlet.java:624) org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) javax.servlet.http.HttpServlet.service(HttpServlet.java:731) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

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request.js?b775:93 Uncaught (in promise) Error: ### Error querying database. Cause: java.sql.SQLIntegrityConstraintViolationException: Column 'CREATE_TIME' in where clause is ambiguous ### The error may exist in URL [jar:file:/root/javaproject/jxSms/ruoyi-admin.jar!/BOOT-INF/lib/ruoyi-boss-3.8.5.jar!/mapper/mo/GMoMessageMapper.xml] ### The error may involve com.ruoyi.mo.mapper.GMoMessageMapper.selectGMoMessageListByParam-Inline ### The error occurred while setting parameters ### SQL: SELECT count(0) FROM g_mo_message ms LEFT JOIN sys_dept d ON ms.DEPT_ID = d.dept_id LEFT JOIN sys_user u ON ms.USER_ID = u.user_id WHERE CREATE_TIME >= ? AND CREATE_TIME <= ? ### Cause: java.sql.SQLIntegrityConstraintViolationException: Column 'CREATE_TIME' in where clause is ambiguous ; Column 'CREATE_TIME' in where clause is ambiguous; nested exception is java.sql.SQLIntegrityConstraintViolationException: Column 'CREATE_TIME' in where clause is ambiguous at _default (request.js?b775:93:1)

这段错误信息是指在执行 JavaScript 中的一个 Promise 对象时，发生了一个未捕获的错误，导致该 Promise 对象被拒绝（rejected）。具体错误原因需要进一步分析代码才能确定。可能是因为 Promise 对象中的代码逻辑...

解析这个报错INTEL MKL ERROR: dlopen(/Users/baiminchen/opt/anaconda3/lib/libmkl_core.1.dylib, 0x0009): tried: '/Users/baiminchen/opt/anaconda3/lib/libmkl_core.1.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/Users/baiminchen/opt/anaconda3/lib/libmkl_core.1.dylib' (no such file), '/Users/baiminchen/opt/anaconda3/lib/libmkl_core.1.dylib' (no such file). Intel MKL FATAL ERROR: Cannot load libmkl_core.1.dylib. Traceback (most recent call last): File "/Users/baiminchen/opt/anaconda3/lib/python3.9/site-packages/PyInstaller/isolated/_parent.py", line 373, in call return isolated.call(function, *args, **kwargs) File "/Users/baiminchen/opt/anaconda3/lib/python3.9/site-packages/PyInstaller/isolated/_parent.py", line 302, in call ok, output = loads(b64decode(self._read_handle.readline())) EOFError: EOF read where object expected During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/Users/baiminchen/opt/anaconda3/bin/pyinstaller", line 8, in <module> sys.exit(_console_script_run()) File "/Users/baiminchen/opt/anaconda3/lib/python3.9/site-packages/PyInstaller/__main__.py", line 194, in _console_script_run run() File "/Users/baiminchen/opt/anaconda3/lib/python3.9/site-packages/PyInstaller/__main__.py", line 180, in run run_build(pyi_config, spec_file, **vars(args)) File "/Users/baiminchen/opt/anaconda3/lib/python3.9/site-packages/PyInstaller/__main__.py", line 61, in run_build PyInstaller.building.build_main.main(pyi_config, spec_file, **kwargs) File "/Users/baiminchen/opt/anaconda3/lib/python3.9/site-packages/PyInstaller/building/build_main.py", line 971, in main build(specfile, distpath, workpath, clean_build) File "/Users/baiminchen/opt/anaconda3/lib/python3.9/site-packages/PyInstaller/building/build_main.py", line 893, in build exec(code, spec_namespace) File "/Users/baiminchen/Desktop/database of xinstitute/main.spec", line 7, in <module> a = Analysis( File "/Users/baiminchen/opt/anaconda3/lib/python3.9/site-packages/PyInstaller/building/build_main.py", line 378, in __init__ self.hookspath += discover_hook_directories() File "/Users/baiminchen/opt/anaconda3/lib/python3.9/site-packages/PyInstaller/isolated/_parent.py", line 404, in wrapped return call(function, *args, **kwargs) File "/Users/baiminchen/opt/anaconda3/lib/python3.9/site-packages/PyInstaller/isolated/_parent.py", line 373, in call return isolated.call(function, *args, **kwargs) File "/Users/baiminchen/opt/anaconda3/lib/python3.9/site-packages/PyInstaller/isolated/_parent.py", line 244, in __exit__ self._write_handle.flush() BrokenPipeError: [Errno 32] Broken pipe

错误信息表明 PyInstaller 在尝试加载 Intel MKL 库文件 libmkl_core.1.dylib 时失败了，并且指出了找不到这个文件。这通常是因为该文件在本机上没有安装或者安装路径不正确。你需要检查你的系统中是否已经正确安装...

分析错误原因"\r\n### Error querying database. Cause: java.sql.SQLSyntaxErrorException: Unknown database 'dszl'\r\n### The error may exist in com/hushi/cms/dao/ContractorPersonDao.java (best guess)\r\n### The error may involve defaultParameterMap\r\n### The error occurred while setting parameters\r\n### SQL: SELECT COUNT(1) total, log.user_name userName, log.user_unit userUnit FROM dszl.access_logs log where log.access_time>DATE_SUB(CURDATE(), INTERVAL 1 YEAR) GROUP BY log.user_name\r\n### Cause: java.sql.SQLSyntaxErrorException: Unknown database 'dszl'\n; bad SQL grammar []; nested exception is java.sql.SQLSyntaxErrorException: Unknown database 'dszl'"

这个错误是由于查询数据库时指定了一个未知的数据库名称 "dszl"，导致 SQL 语法错误。可以检查一下数据库连接配置中是否正确设置了数据库名称，或者数据库中是否存在该名称的数据库。如果确认数据库名称正确无误，...

我的代码 package com.neutech.service.impl; import com.baomidou.mybatisplus.core.metadata.IPage; import com.baomidou.mybatisplus.extension.plugins.pagination.Page; import com.neutech.entity.Product; import com.neutech.mapper.ProductMapper; import com.neutech.service.ProductService; import org.junit.jupiter.api.Test; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; @SpringBootTest public class ProductServiceImplTest { @Autowired private ProductMapper productMapper; @Test public void test(){ Page page = new Page<>(1,2); IPage iPage = productMapper.selectPage(page,null); System.out.println(iPage); } }报错org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. Cause: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0 ### The error may exist in com/neutech/mapper/ProductMapper.java (best guess) ### The error may involve com.neutech.mapper.ProductMapper.selectPage_mpCount ### The error occurred while handling results ### SQL: SELECT COUNT(*) FROM product ### Cause: java.lang.IndexOutOfBoundsException: Index: 0, Size: 告诉我怎么改

根据报错信息，可以看出是在执行 MyBatis 的查询语句时发生了错误，具体原因是在执行 selectPage_mpCount 方法时，发生了 java.lang.IndexOutOfBoundsException: Index: 0, Size: 0 异常，可能是因为查询结果为...
zip

yolov5s nnie.zip

yolov5s nnieyolov5-nnieyolov5s nnieYOLOv5 pytorch -> onnx -> caffe -> .wk 1、模型是yolov5s,将focus层替换成stride为2的卷积层。reshape和permute层也做了调整。具体的修改过程可以参考这个大佬的文章https://blog.csdn.net/tangshopping/article/details/1100386052、模型是在hi3559av100上跑的，mapper版本是1.2。3、用法mkdir buildcd buildcmake -DCMAKE_TOOLCHAIN_FILE=../hi3559.toolchain.cmake ..make -j4./yolo_nnie参考https://blog.csdn.net/tangshopping/article/details/110038605watermelooon/nnie_yolohttps://github.com/ultralytics/yolov5https://githu

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